Fatigue and fracture of cemented carbide

Fatigue and fracture is one of the performance of hard alloy. When used for mining and metal cutting, hard alloy is usually in a complex state of stress load, and due to wear and fatigue process will lead to the destruction of the material. In the early 1840 s, found that the fatigue behavior is sensitive to intensity decreases under the cyclic force loading, the fatigue behavior of the cemented carbide research widely attention in the recent 20 years.

Research mainly divided into two classes: a study life, has a crack in the sample of the exert a certain frequency of cyclic stress or strain, make the number of samples to stress or strain fatigue damage; The other is a study defect resistance, fatigue life is defined as made to the main crack size of the sample increases to a particular value of fatigue cycle or time. Research on the latter is more, linear elastic fracture mechanics (LEFM) very useful to study the fracture behavior of the cemented carbide. Online elastic fracture mechanics, the initial defects of unstable proliferation caused the brittle fracture of materials. Due to the hard alloy is usually very hard, can prevent the generation of fatigue crack, and carbide always has some defects, such as residual hole, impurity and irregular shape larger particles WC (tungsten carbide), by studying the crack growth resistance to estimate the fatigue life of cemented carbide will be more reasonable.

Fracture toughness of cemented carbide is an important mechanics performance, research of cemented carbide fracture toughness could be used to determine the fatigue behavior. But for WC - Co (cobalt tungsten carbide, fracture under static and cyclic loading condition is different, because of different fracture mechanism of Co. Co can occur under static loading condition, plastic deformation, is ductile, and under cyclic stress state, the martensitic phase transformation in the Co, known as the sensitive fracture source.

Similar to the fracture toughness, fatigue strength also depends on the micro structure parameters of cemented carbide. Fracture strength as Co mean free path, the WC grain size, and decrease of Co content and carbon content increases, as the solid solution cubic phase increase with the increase of the content of Co. In the process of fatigue, Co binder phase of phase transition is a kind of very important failure mechanism. A large number of accumulative deformation in the process of cyclic loading and/or high stress transform cubic hexagonal phase results. Behind the crack tip to the result of the phase transition of ductile ligaments decreases, so that the protective effect of the crack tip. This is hard alloy under cyclic loading has a strong effect, the fatigue life and life depends on the frequency of stress.

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Due to the complex nature of microscopic results, the fatigue behavior of cemented carbide is still have a lot of uncertain factors. Horniness alloy material properties, various factors of fracture mechanics and microscopic results parameters all have influence on the fatigue behavior of cemented carbide, stress intensity factor and the influence of the mean free path of the binding phase is most important.

Carbide performance improvement

Cemented carbide as a modern tool materials, application is becoming more and more widely, so how to use limited resources to improve the efficiency of higher? It's need to improve the performance of hard alloy to improve service life and the work efficiency.

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A, improve the quality of raw materials

1. To improve the purity of raw materials

Thought to levels below 200 PPM Na, Li, B, F, A1 and other trace elements of N, P, K powder reduction, carbonization and sintering of hard alloy to some extent, the influence of the performance of alloy and the effects of organizational structure is also worth studying.

High strength, high impact toughness of the alloy (such as mining alloy and milling cutter) demand is high,

Impact load is not big but it requires the continuous cutting tool machining accuracy high alloy is not high to the requirement of purity of raw materials.

2. Control the particle size and distribution of raw materials

Prevent defects: should avoid carbide or cobalt powder raw material in large particles, prevent alloy during sintering generated thick carbide grain and cobalt pool.

Optimize performance: to control the particle size and particle size composition of raw materials, to meet the needs of different products. Such as cutting tool should have less than 2 microns of tungsten carbide powder's particle size, abrasive tools should choose 2 to 3 micron tungsten carbide powder, while mining tools shall be greater than 3 micron tungsten carbide powder.

Grading: our country now also developed a hydraulic technique and technology of the continuous gradation of tungsten powder, can according to need to industrial tungsten powder can be divided into five to eight grade, lower limit of 0.5-2 microns.

Second, improve the organization structure of alloy

Ultrafine grain alloy:

Carbide grain size is less than 1 microns, simultaneously has the high hardness and toughness.

Heterogeneous structure alloy:

Heterogeneous structure of the alloy are two kinds of different ingredients or mixtures of different particle size mixture together at microscopic organization or components made of special varieties of uneven carbide, it is often both coarse grain of alloy with high toughness and high wear resistance, fine grain alloy with high cobalt alloy or with high toughness and high wear resistance of low cobalt alloy.

Structure of the alloy

Through a special production process to make alloys organization by those rich cobalt metal pulse range associated with the orientation of tungsten carbide shaft single crystal wafer area of this alloy under shock compression are outstanding wear resistance and high durability.

The gradient alloy:

Composition gradient changes of the alloy, the hardness and toughness presents gradient change.

Three, improve or choose new hard phase and binder phase

Hard phase:

Common hard phase is tungsten carbide, but due to the shortage of tungsten resources in the world. Developed by TiC TaC, Cr3C2 open hard phase of the alloy, etc. In addition, adding different amount of ZrC is studied. HfC, Cr3C2, VC, MO2C and NbC carbide to refine alloy to improve the performance of the organization. Among the more effective is HfC, TaC, VC,

Other carbide, due to the poor wettability of binding metal on them, so it failed to make big progress.

Binding phase

Commonly used cobalt such as adding alloying elements, add some inert oxide superfine to strengthen the binding phase;

Using Ni, Fe, or other metal to replace the cobalt binding phase, alone with Ni and Fe as binder. On the wettability of the hard phase, is not necessarily ideal for hard phase solubility, etc

Metal binding phase. Fe, Co, Ni alloy, (Fe, Ni) alloy, CraC2 - (Ni, p) binding phase carbide, with copper alloy, Ni, MO alloy, Nb - Co alloy, Nb - Ni alloy such as cemented carbide binder

Because of cobalt with good comprehensive performance, it for carbide, especially the carbide tungsten carbide based, or the best bonding metal effect.

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Common way of wear of cemented carbide

Cemented carbide with its superior performance is known as the "teeth" industry, carbide blade is now manufacturing strong cutting tool. Commonly used cemented carbide products work wear our simple to discuss.

Friction and wear is an important service behavior of cemented carbide, the performance is to determine the key indicators of hard alloy applications. Usually friction and wear can be divided into two categories, the first category is the result of the mechanical action between the friction pair; The second is due to chemical reaction between the friction pair, such as oxidation, friction caused by chemical reaction.

Mechanical wear and can be divided into, adhesion, corrosion, erosion and surface fatigue wear, etc. Cemented carbide in the process of application is mainly the corrosion damage form, also known as abrasive wear. Reduce the grain size in general can help improve the wear resistance of cemented carbide. For example, the ultra-fine grain cemented carbide wear resistant performance is twice as common cemented carbide. But, depending on the friction and wear mechanism of the specific need friction for coupling the organizational structure of the carbide itself.

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In the diamond as a dual, plastic deformation and surface fracture is the main role; In ZrO2, SiC, SiO2 soft materials such as dual, WC grain dislodgement (tungsten carbide) and Co (cobalt) phase of wear is the main mechanism. Coarse grain in wear usually show a more brittle, and fine grained materials exhibit more plastic. However, in using fine grinding, such as 1 ~ 10 microns diamond, Al2O3, and SiC, the wear resistance of cemented carbide is decreased as the size of WC grain size reduced. The phenomenon may be related to wear of WC grain uproot, tungsten carbide WC grain size, the greater the contact area with Co, the more the greater the depth, the greater the pull out of the difficulty, and therefore the more wear-resisting.

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The development trend of China's cemented carbide industry

China's tungsten resources for cemented carbide industry development have created favorable conditions. After 50 years of development, China's cemented carbide industry has quite a scale and a higher level of technology. Due to the market economy in China set up time is not long, cemented carbide industry, like other industries, some non-standard behavior, developing to a certain extent affect the healthy development of China's cemented carbide industry. At present China's cemented carbide products compared with foreign advanced level there is a certain gap, but in the case of opportunities and challenges coexist, China cemented carbide industry will face the challenge, cherish the opportunity and try to overcome difficulties in progress, to achieve new development and progress.    

3.1 in the face of challenge, cherish the opportunity

Because of China's positive sound macro economic policies, rapid growth of national economy, carbide demand rapid growth. In 2004 China's cemented carbide production has reached 15000 tons, in the future for a long time China's national economy will be rapid development, will continue to provide a good development space for cemented carbide. As the automobile industry rapid development as well as nc machine tools and machining center in machining widening application, high performance and high precision grinding blade coating and form a complete set of tools for high-value-added cemented carbide products demand will continue to increase. According to the analysis to the 2014 China automotive industry only need carbide tool cost will reach 18 billion yuan. In recent years, with the development of economy and the continuous improvement of people's living standard in China, carbide using leadership continues to expand, has rapidly into the civilian decoration industry, such as bracelet, watch case, luggage zipper head and sign, etc., can imagine how much its development space.    

Also in the international market, the well-known high-grade carbide and high precision tool, mold and other products containing ten times, even dozens of times in the medium and low economic benefit of cemented carbide. This part of the hard alloy and form a complete set of tools is the advantage of the advanced foreign cemented carbide production enterprise product, and is constantly expanding market share in China. China cemented carbide industry also attaches great importance to high value-added carbide products production, cherish the good opportunities provided by the domestic and foreign markets, in the face of challenge, constantly improve the low-standard carbide in the international market share at the same time, to analyze their own disparity and the insufficiency, actively take effective measures to speed up the high-grade carbide and supporting deep product development and production, through the unremitting efforts to strive for this kind of product should be at home and abroad market.    

3.2 grams short, strong efforts to pursue

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China's cemented carbide industry development in such aspects as resources, market, scale, labor has certain advantages, equipment level as countries and measures and to increase the enterprise benefit also will continue to improve, but if the poor innovation ability and management level is not high problem cannot be solved as soon as possible, is bound to hinder the development of Chinese cemented carbide industry to high technology level. For this on the one hand, enterprises, institutions of higher learning, scientific research institutes to increase talent and capital investment, focus on high-precision high-performance abrasive coating alloy and form a complete set of tools, high-performance super fine and nano carbide, functionally graded alloy, metal ceramics, ceramic and super-hard tool material, cemented carbide net forming technology, cemented carbide production technology and process equipment innovation, hard alloy basic theory research, CIMS application in the cemented carbide manufacturing and production management in key areas such as research, accelerate the pace, shorten the gap with foreign advanced level. On the other hand, the government will take implementation of cemented carbide production access system, further standardize the business behavior of tungsten products marketing, from the guide, funding, policy, resources and so on various aspects focus to some strong potential for development of enterprises, through the unremitting efforts, for 10 years or so time to make a few has the strength of the cemented carbide enterprises international competition ability.    

3.3 the international cooperation and common development

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For fifty years, China's cemented carbide enterprises and cooperation between the cemented carbide enterprises abroad China cemented carbide industry is an important part of the history of the development. As early as the early 50 s, the former Soviet union carbide enterprises and research units is built by China's largest cemented carbide production enterprises - zhuzhou cemented carbide plant. After the reform and opening, cemented carbide industry is an early industry technical cooperation with overseas counterparts. In the early eighty s, some Chinese manufacturers is widely closely contact with foreign advanced manufacturers, one after another with zhuzhou cemented carbide plant and Sweden sandvik company, Europe and the United States and zigong cemented carbide factory equipment enterprises, jianghan bit factory and hughes companies in the United States, nanchang cemented carbide plant and Toshiba w company, shenzhen golden state company with Germany, the Swiss company specialized machine tool for technical cooperation, etc. Through cooperation in reforming the old production line, the construction of new production lines, vigorously promote the development of China's cemented carbide industry, foreign cemented carbide enterprises are also profit from it. Today, this kind of cooperation in various forms of cooperation. Cemented carbide enterprises in China has always believed that this kind of cooperation is conducive to the development of Chinese cemented carbide industry, also make foreign cemented carbide enterprises gain huge economic benefits, at the same time had been looking forward to cooperate in the higher and newer level. Previous cooperation on technology import, purchase of advanced equipment, foreign factories in China. In addition to the cooperation in the future, Chinese enterprises welcome foreign high technology talents and management talents to work for a Chinese company, welcome the foreign advanced manufacturing enterprises with advanced production technology and management experience with China enterprise joint venture factory. Believe that with the advantages of good cooperation, the Chinese and foreign enterprises will get a win-win situation, the world of cemented carbide industry will be better tomorrow.

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2013 year-end summary of Six Star Hardmetal

China's lunar calendar in 2013 will soon be past, six star hardmetal company held its annual meeting before the holiday and dinner party activities, summary 2013, looking forward to 2014,


In 2013 in the whole international and domestic economic situation is uncertain, the company with excellent product and favorable price positioning, achieve sales growth of 60% year-on-year, here, we would like to thank all the staff paid hard work this year, at the same time also want to sincerely thank you for all of our customers support, hope in the next year, we can move forward hand in hand and create a win-win situation.

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Sales Annual Summary 

Company Dinner Party

Reasonable choice of carbide drill

Carbide drill basic types: solid carbide drill bits, carbide indexable insert carbide drill bit, welding type and replaceable tungsten carbide tooth bit and crown.(Tungsten Carbide Buttons Carbide Teeth Auger Teeth Carbide Tips Suppliers)

Solid carbide drill bits

Suitable for use in advanced machining center. This drill adopts fine grain cemented carbide materials, to extend the service life, also conducted TiAlN coating processing, specially designed blade geometry make drill has the function of self-centering, when most of the artifacts in drilling materials have good control chip and chip removal performance. The bit self-centering function and strictly control the manufacturing precision can ensure that the quality of drilling hole, does not need again for subsequent finishing after drilling. Cemented carbide indexable insert bit for processing a wide range of aperture, the depth of processing range is 2 ~ 5 D D (D for aperture), can be applied to the lathe and other rotating machine. Welded carbide drill

Is solid welding on steel drill made a hard alloy crown. This drill adopts self-centering blade geometry, cutting force is small, for the majority of workpiece material all can achieve good chip control, good surface finish, processing the hole size precision and positioning precision is very high, no longer for subsequent finishing. This drill adopts internal cooling method, can be used in machining center, CNC lathe, or other high rigidity, high speed machine tools. Replaceable tungsten carbide tooth bit crown (Carbide Brazed Tips Carbide Tip)

Is the recent development of a new generation of drilling tool. It is composed of steel and replaceable solid carbide drill body crown, compared with the welding type carbide drill, its machining precision, but due to the crown can be replaced, so can reduce machining cost, raise the productivity of drilling. This drill can obtain accurate aperture increment with the cardiac function, so the aperture processing precision is high. Seco can now offer the three specific geometry blade CrownLoc bit: the first is a conventional passivation edge radius, edge band width and the cone Angle of the universal geometric shape, suitable for most types of steel material machining; The second is to have a wider blade zone and the geometry of the chamfering edge type, suitable for processing of cast iron materials; The third blade geometry can reduce the cutting heat and work hardening, suitable for processing of stainless steel and super alloys. Choosing the carbide drill considerations: when choosing carbide drill machining accuracy, first of all need to consider the size of the drilling machining accuracy requirement. In general, by processing the aperture is smaller, the smaller tolerance also. Therefore, bit manufacturers usually according to the nominal diameter size of the hole processed classify bit. In the above four types of carbide drill, solid carbide drill bit the processing precision of the highest (phi 10 mm whole hard alloy bit of tolerance range of 0 ~ 0.03 mm), so it is the best choice for processing high precision hole; Welding type carbide drill or replaceable tungsten carbide tooth bit crown the tolerance range of 0 ~ 0.07 mm, fit in with the general precision machining; Ann of cemented carbide indexable insert bit is suitable for rough machining, although its processing cost is usually lower than other several drill head, but its machining precision is low, the tolerance range of 0 ~ 0.3 mm (depending on the bit length to diameter ratio), so it is commonly used in the machining accuracy is not high, or by replacing blades complete boring finishing. Machining stability  besides considering drilling accuracy requirement, selecting bit still need to consider the stability of the machine tool. Stability of machine tool for the safety of the bit life and drilling accuracy is important, so you need to carefully check the working state of the machine tool spindle, fixture and accessories. In addition, the stability of the drill itself should also be considered. Solid carbide drill bits, for example, better rigidity, therefore can achieve high machining accuracy. The cemented carbide indexable insert bit of structural stability is poorer, prone to deflection. This bit installed on two pieces of indexable insert, blade used for machining the hole of the central part of the blade is processed from the blade to the outer diameter of the outer part. In only the blade into the cutting processing of initial stage, the bit is in unstable condition, easy to cause drill deflection, and the longer the bit, the greater the amount of deflection. Therefore, in the use of the length more than 4 d of cemented carbide indexable insert bit during drilling process, should be reduced at the beginning of the drilling phase feeding, after entered a stage of stable cutting to increase the feed rate to normal level again. Welding type carbide drill and replaceable tungsten carbide tooth bit crown is composed of two symmetric cutting edge geometry blade can decide from the heart, this cutting edge design to make it with high stability when cut into the workpiece doesn't need to reduce the feed rate, only when the bit tilt installation and cutting except when the workpiece surface with a certain Angle, the proposal at this time in go, when the drill will feed rate decreased by 30% ~ 50%. Due to this kind of drill steel drill can produce tiny deformation, therefore very suitable for lathe processing; And solid carbide drill bits, because of its high brittleness break more easily when used in lathe processing, especially when the bit centering condition is more so. Chip removal and cooling fluid during the processing chip removal is drilling problem that nots allow to ignore. In fact, one of the most serious problems encountered in the drilling process is draining crumbs (especially when the low carbon steel workpieces), and no matter use what kind of drill bit are unable to avoid this problem. Processing workshop often adopt the way of external injection cooling fluid auxiliary chip removal, but this method is only in the deep processing hole under the condition of less than the pore size and reduce the cutting parameters. In addition, it is necessary to choose match the bit diameter, kinds, suitable coolant flow rate and pressure. With no installation cooling system of machine tool spindle, should use coolant ducts. By processing the deeper the hole, the chip is more difficult, need to pressure is, the greater the cooling fluid and shall ensure that bit manufacturers recommended minimum coolant flow, such as coolant flow rate is insufficient, you need to reduce the processing feeding. Each hole machining cost productivity or every hole is the most important factors that affect the drilling cost. In order to improve the productivity, bit manufacturers are committed to the study of machining method can integrate various operating process, to develop and can realize high feed, high speed processing and drilling tools. The latest development of replaceable tungsten carbide tooth bit crown has excellent processing efficiency. Bit wear, the user does not have to change the whole drill, simply replace the hard alloy crown, the purchase cost is only equivalent to welded or overall carbide drills resharpening a fee. Hard alloy crown easy replacement and high repeatability precision, processing workshops available a drill equipped with multiple crown, in processing different aperture size of the hole. Drilling of this modular system can reduce the diameter of 12 ~ 20 mm drill bit of cataloging costs, but also can save the welded or overall carbide drill for resharpening need backup tool costs. When considering every hole processing costs, but also takes into account total bit life. Generally speaking, a solid carbide drill bits only resharpening 7 ~ 10 times, a welding carbide drill resharpening only about 3 ~ 4 times, and replaceable tungsten carbide tooth bit crown when machining steel material, its steel drill replaceable crown at least 20 ~ 30 times. Due to welding or overall carbide drill needs resharpening, to avoid cutting tool breakage, workshop in use when the bit tilt to the using of lower cutting parameters, which affect drilling productivity. And replaceable tungsten carbide tooth bit crown without heavy grinding, workshop can be used when processing the largest feeding and cutting speed and don't have to worry about broken crown. In many cases, due to welding or overall carbide drill after resharpening of cutting edge shape and edge processing status and the new drill head is difficult to perfectly, so its cutting performance and the new bit also exist a certain differences. In addition, such as heavy, mishandling of a cutting edge grinding process can make the edge easy to damage, drilling torque and cutting force and cutting heat increases, which leads to bit shorten service life. The new replaceable tungsten carbide tooth crown the working life of the bit is more stable.(Carbide Shims CNC Inserts)

The very favorable price Tungsten Carbide Ball.

Carbide ball, commonly known as tungsten steel ball, refers to the use of hard alloy ball, ball, made of hard alloy ball high hardness, wear resistance, corrosion resistance, resistance to bending, use conditions, can replace all the steel ball products. Commonly known as tungsten steel ball, it is to point to to materials with hard alloy ball, ball, carbide ball high hardness, wear resistance, corrosion resistance, resistance to bending, the use of harsh, can replace all the steel ball products.

2 types respectively Tungsten Carbide Ball  with high hardness of the refractory metal carbides (WC, TiC) micron grade powder as main ingredients, with cobalt (Co) and nickel (Ni), molybdenum (Mo) as the binder, sintering in vacuum furnace or hydrogen reduction furnace of powder metallurgy products, at present common cemented carbide are YG, YN, YT, YW series.

Commonly used cemented carbide balls main points: YG6 carbide ball. YG6x cemented carbide balls. YG8 cemented carbide balls. YG13 cemented carbide balls. YG20 hard alloy ball. YN6 cemented carbide balls. YN9 cemented carbide balls. YN12 cemented carbide balls. YT5 cemented carbide balls. YT15 cemented carbide balls.

3 properties characteristics of Tungsten Carbide Ball  high hardness, wear resistance, corrosion resistance, resistance to bending, use conditions, can replace all the steel ball products. Carbide ball 90.5 or higher hardness, density = 90.5 g/m3; .

4 use relevant carbide ball scope is very broad, such as: precision bearing, instruments, meters, pen, sprayer, pump, mechanical parts, seal valve, brake pump, crushing hole, oil field, lab, hardness measuring instrument hydrochloride, fishing gear, counterweight, decoration, finishing and so on high-end industry!

5 production process of cemented Carbide Balls production process with other similar cemented carbide products, mainly include the pulverizing to formula according to the requirements of USES, the wet and dry mix - crushing - and sieving to join after forming agent, then to sieve made the mixture, drying granulating to cold isostatic pressing, molding and sintering to molding (blank), packing and warehousing. , depending on the specific application requirements and related parameters are cemented carbide balls, tungsten steel ball, tungsten ball, carbide spherical golden ratio overlap, and other products. The smallest cemented carbide balls can be a diameter of about 0.3.

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China tungsten oxide prices rose 2% so rapidly.

Tungsten smelting, because the main raw material APT shortages, tungsten oxide prices rose 2%. Price of tungsten oxide is 99.95% before 218000-220000 yuan/ton rose to 220000-224000 yuan/ton.

A jiangxi smelters said, "we bear a lot of pressure, because it is hard to get enough APT to maintain production." He predicted that tungsten oxide price will rise again in the next few days, because APT to stop the supply of raw materials suppliers.

The second smelters in jiangxi province says, "yesterday I from a friend as smelters to 208000 yuan/ton price to buy a batch of APT. We will offer tungsten oxide rose to 224000 yuan/ton."

Tungsten oxide export prices from last week's $400 - $405 / mt also rose to $410 - $415 / mt.

Hunan a trader said, "smelters to limit the supply of tungsten oxide, because shortage of APT and export markets of goods is not much." He must have tungsten oxide export prices will rise to $410 / mt this week. "Although the European market buyers earlier this month to reduce procurement, but because of the lack of spot market export price will be higher in the future.

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Super coarse grain cemented carbide

According to the grain size grading standard Sandvik, coarse grained cemented carbide grain size is 3.5 ~ 4.9 microns, super coarse grain cemented carbide grain size is 5.0 ~ 7.9 microns.

Oildrilling, Rock Auger Bullet Teeth, coal Auger Teeth, Carbide Teeth,Rock Auger Teeth, Bullet Teeth for Augers stamping die, cold pavement milling planer roll and other widely used in the coarse grain and coarse grain cemented carbide. Low cobalt coarse grain and high cobalt fine grain cemented carbide have become the development direction of cemented carbide. Low cobalt coarse grain of alloy design principle is: the WC grain size, specific surface area is small, thickening of cobalt in the alloy layer, so as to improve the impact toughness of alloy. The cobalt content in the alloy decreases, the increase of WC content in the alloy, improve the alloy wear resistance. Low cobalt coarse grain alloy combination makes the alloy good toughness, high abrasion resistance.

Grain size of coarse grained cemented carbide size depends on the size of WC powder grain size.

Aluminothermy is a production of coarse grain WC (tungsten carbide) special methods. It will tungsten concentration, rolled steel scale (Fe3O4), aluminum powder, CaC2 and other ingredients, add a small amount of potassium perchlorate do lead content. Material exothermic reaction, temperature up to 2500 ℃ ~ 3000 ℃, after the reaction with furnace cooling. Products, such as the upper for potassium calcium aluminate slag for lower metal iron containing WC. About iron contains WC65 %, iron after crushing, cleaning with hot sulfuric acid and hydrochloric acid solution dissolve to iron, single crystal WC particles.

Preparation of coarse grained cemented carbide, want to reduce the efficiency of ball mill and broken as far as possible, improve the mixture, so as to avoid the WC grain is too broken. In practical production increase grinding ball diameter, cut the ball material ratio, shortening the time of ball mill and other methods to reduce the efficiency of ball mill and broken, improve the efficiency of hybrid. Microstructure of coarse grained cemented carbide WC average grain size 7 microns the heavy rain.

An Email to Tungsten Carbide Button Tips Customer.

In fact, whether you really want to buy our products, or just before your supplier price comparison, we are very welcome, after all, business is business, we both have to earn this business can do!

Actually, Carbide Buttons product quality really difference is very big, price difference is not small, in this regard, if really is a long-term cooperation, also can't really light to decide by the price, but if you do the middlemen, may consider to first price is heavy, it's understandable that we used to have India customers purchase from China is quite low alloy tooth, but then finally gave us a procurement, and cooperation until now!!!!

Tungsten Carbide Button we have several grades of products, is a kind of export markets in Europe and America, the other is specially exports of India and the Middle East market, another is for the Chinese market products, the price has a corresponding difference, of course, also on the quality of each different.


In the end, because we are in a New Year big promotion period, if you really have the sincerity to purchase, we hope to receive your immediate comments and reply!

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M type Tungsten Carbide Tips for making Auger Tips and Coal Cutter Picks

Carbide Tips Suppliers specialize in Tungsten Carbide Buttons which is a Carbide Teeth brazed in rock drill bits and Auger Teeth.

From http:/www.sixstarhardmetal.com

Coal Cutting Tips is equipped with advanced processing techniques of Coal Cutting Tips .The auxiliary tips provide better protection of brazed joint and slow steel wash. The patented design profoundly elongates the tool life and helps to realize high-efficient, reliable cutting in long wall mining and continuous mining.They are especially suitable to hard coal seam mining. We supply Coal Cutting Tips and other products in different specifications with excellent working performance.

Specifications

Coal Cutting Tips

1) Stable mechanical properties

2) High weldability

3) Abrasion resistance

4) Impact resistance.

Type M24 For making auger tips in excavators

Type Dimension (mm) D H h R r Dim. Tol. Dim. Tol. M2417A 17 ±0.50 26.5 ±0.5 12 26 1.75 M2417B 17 ±0.50 26.5 ±0.5 15 26 1.75

Type M20 For making auger tips in excavators

Type Dimension (mm) D H r ɑ° e Dim. Tol. Dim. Tol. M2009 9 ±0.3 16 ±0.5 1.0 90 1.0 M2012A 12 ±0.3 18 ±0.5 1.5 82 1.0 M2012B 12 ±0.3 20 ±0.5 1.5 82 1.5 M2018 18 ±0.4 32 ±0.5 1.5 82 2.0

Type M21 For making auger tips in excavators and buttons in tricone bits

Type Dimension (mm) D H R ɑ1° ɑ2° e β° Dim. Tol. Dim Tol. Dim Tol. M2110A 10 ±0.30 18 ±0.5 8 ±0.3 53 53 1.0 30 M2110B 10 ±0.30 20 ±0.5 5.5 ±0.3 50 58 1.0 45 M2112A 12 ±0.30 20 ±0.5 6.5 ±0.3 32 40 1.0 45 M2112B 12.5 ±0.40 25 ±0.5 10 ±0.35 46 46 1.0 30 M2115 15 ±0.40 22 ±0.5 11 ±0.35 45 45 2.5 30 M2118 18 ±0.40 20 ±0.5 14.4 ±0.5 37 37 1.5 45

Factors influencing the carbide relative magnetic saturation value.

 Affect the relative magnetic saturation value of carbide alloy basically has the following six factors:
1, carbide WC in the total carbon.
2, the mixture (including the press) oxygen levels.
3, hydrogen dewaxing, presintering carbon quantity change.
4, vacuum dewaxing, presintering, the amount of carbon in change.
5, hydrogen carbon changes in sintering process.
6, carbide vacuum sintering process of carbon.

Six Star Hardmetal is a professional Tungsten Carbide manufacturer in China, we make a large selection of standard and make-to-order tungsten carbide block which are used for oil-field TC bearing, centralizer, stabilizer and mining PDC drill bits.
Tungsten Carbide Strips Recommended grade: YG8 YL1 YG15 YG11C
The ability of wear compacts and stabilizer inserts to withstand the damage forces of drilling operations is crucial.  we offers these products in a variety of wear-resistant grades designed to optimize performance!

Other carbide wear parts - Tungsten Bar, Carbide Tiles and Tungsten Carbide Plate are made according for your drawings.
Selling points:
1. factory direct price
2. high hardness snd durability
3.superior quality
4. provide after-sale service
5.oem&odm
6 fast delivery


Tungsten Carbide Strips - SIX STAR

From http://www.sixstarhardmetal.com kim@sixstarhardmetal.com

Carbide cutting tools Integrated application of concept, the concept of system engineering

Carbide Cutting Tools manufacturers, machine tool in the new project cooperation with customers, during the bidding process will keep close contact with relevant partners, the implementation of some key technologies and analytical processing technology and application of tools influence on the product cost, for example, how the clamping parts to maintain the stability of the processing, the cutting tool how to distribution, should adopt what kind of processing strategies, and whether you need special tools, etc.; All processing technology and flexible degree also depends on whether the customer requires running 24 hours a day.

Manufacturing cost lowering required pressure forced to suppliers and other large quantities of spare parts manufacturers from all over the world carefully calculated the parts cost. In order to meet the customer's requirements, in the world machine tool manufacturer and cutting tool manufacturers are more closely, rather than stay in the single cutting tool selection, procurement and supporting. Because to modify an existing technology or halfway to participate in the project cooperation, need to pay more. Early intervention, for the new production line is equipped with high efficient combination tool, at the same time, given the CBN cutting tool's economy depends largely on the uniformity of workpiece materials, in order to use CBN cutting tool instead of ceramic and metal cutting tool to improve processing efficiency and reduce cost, also advise customers improve the quality of workpiece materials, casting the problem of uneven, can make the new production line equipment utilization rate reached 98%, the effective use degree of 85%, better play to the role of the cutting tool manufacturers.
With years experience of producing Carbide Cutting Tools, we can offer to you cost-effective Carbide Shims for CNC Inserts.