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Material price and basic knowledge of cemented carbide rods

2021-04-07 15:09:20 | Carbide Rods

Cemented carbide is the most widely used type of high-speed machining (HSM) tool material. This type of material is produced by powder metallurgy. It consists of hard carbide (usually tungsten carbide WC) particles and a softer metal bond composition.At present, there are hundreds of WC-based cemented carbides with different compositions. Most of them use cobalt (Co) as a binder. Nickel (Ni) and chromium (Cr) are also commonly used binder elements, and other elements can be added. Some alloying elements.

(1) Simple cemented carbide grades

Such grades used for metal cutting usually contain 3%-12% cobalt (weight ratio).The size range of tungsten carbide grains is usually between 1-8m.Like other grades, reducing the particle size of tungsten carbide can increase its hardness and transverse rupture strength (TRS), but it will reduce its toughness..The hardness of simple grades is usually 89 to 93.Between 5HRA; the transverse rupture strength is usually 1.2-2.Between 4MPa (175-350ksi).The powder of this type may contain a large amount of recycled raw materials.

Simple grades can be classified into C1-C4 in the C grade system, and can be classified according to the K, N, S and H grade series in the ISO grade system.Simple grades with intermediate characteristics can be classified as general grades (such as C2 or K20), which can be used for turning, milling, planing and wok processing; grades with smaller grain size or lower cobalt content and higher hardness can be used Classify as finishing grades (such as C4 or K01); grades with larger grain size or higher cobalt content and better toughness can be classified as roughing grades (such as C1 or K30).

Tools made with simplex grades can be used for cutting cast iron, 200 and 300 series stainless steel, aluminum and other non-ferrous metals, high temperature alloys and hardened steel.Such grades can also be used in non-metal cutting fields (such as rock and geological drilling tools), and the grain size of these grades is in the range of 1.5-10m (or larger), cobalt content is 6%-16%.Another non-metal cutting application of simple cemented carbide grades is to make dies and punches. These grades usually have a medium-sized grain size with a cobalt content of 16% to 30%..

(2) Microcrystalline cemented carbide grades

Such grades usually contain 6% to 15% cobalt.During liquid phase sintering, the added vanadium carbide and/or chromium carbide can control the growth of grains, thereby obtaining a fine grain structure with a grain size of less than 1m.This fine grain grade has very high hardness and 3.Transverse breaking strength above 45MPa (500ksi).The combination of high strength and sufficient toughness enables such brands of tools to adopt a larger positive rake angle, which can reduce cutting force and produce thinner chips by cutting rather than pushing metal materials.

Through strict quality identification of various raw materials in the production of grade cemented carbide powder, and strict control of sintering process conditions to prevent the formation of abnormal large grains in the microstructure of the material, appropriate Material properties.In order to keep the grain size small and uniform, the recycled recycled powder can only be used when the raw materials and recycling process can be fully controlled, and extensive quality inspections are implemented..

Microcrystalline grades can be classified according to the M grade series in the ISO grade system. In addition, the other classification methods in the C grade system and the ISO grade system are the same as the simple grades..Microcrystalline grades can be used to manufacture tools for cutting softer workpiece materials, because the surface of this tool can be processed very smoothly and can maintain extremely sharp cutting edges.

Microcrystalline tools can also be used to process nickel-based super alloys, because this tool can withstand cutting temperatures as high as 1200C.For the processing of high-temperature alloys and other special materials, the use of microcrystalline brand tools and ruthenium-containing pure brand tools can simultaneously improve its wear resistance, deformation resistance and toughness.Microcrystalline grades are trapped and combined to manufacture rotating tools (such as drills) that generate shear stress.There is a drill bit made of composite grades of cemented carbide. The cobalt content in the material is different in a specific part of the same drill bit, so that the hardness and toughness of the drill bit are optimized according to the processing needs..

(3) Alloy type cemented carbide grades

This type of grade is mainly used for cutting steel parts, and its cobalt content is usually 5% to 10%, and the grain size range is 0.8-2m .By adding 4% to 25% of titanium carbide (TiC), the tendency of tungsten carbide (WC) to diffuse to the surface of steel chips can be reduced.By adding no more than 25% of tantalum carbide (TaC) and nickel carbide (NbC), the strength, crater resistance and thermal shock resistance of the tool can be improved.Adding such cubic carbides can also improve the red hardness of the tool, and help avoid thermal deformation of the tool in heavy cutting or other machining where the cutting edge will generate high temperatures..In addition, titanium carbide can provide nucleation sites during the sintering process to improve the uniformity of cubic carbide distribution in the workpiece.

Generally speaking, the hardness range of alloy type cemented carbide grades is 91-94HRA, and the transverse fracture strength is 12KPa (150-300ksi).Compared with simple grades, alloy grades have poorer wear resistance and lower strength, but they have better bond wear resistance..Alloy type grades can be classified into C5-C8 in the C grade system, and can be classified according to the P and M grade series in the ISO grade system.Alloy grades with intermediate characteristics can be classified as general grades (such as C6 or P30), which can be used for turning, tapping, planing and milling.The grades with the highest hardness can be classified as finishing grades (such as C8 and P01) for finishing turning and key cutting.These grades usually have smaller grain size and lower cobalt content to obtain the required hardness and wear resistance.However, similar material properties can be obtained by adding more cubic carbides.The toughest grades can be classified as roughing grades (such as C5 or P50).These grades usually have a medium particle size and a high cobalt content, and the addition of cubic carbides is also small, in order to obtain the required toughness by suppressing crack propagation.In intermittent turning, the cutting performance can be further improved by using the cobalt-rich grades with higher cobalt content on the tool surface..

Alloy grades with lower titanium carbide content are used for cutting stainless steel and malleable cast iron, but can also be used for processing non-ferrous metals (such as nickel-based super alloys).The grain size of these grades is usually less than 1m, and the cobalt content is 8%-12%.Grades with higher hardness (such as M10) can be used for turning and machining malleable cast iron; grades with better toughness (such as M40) can be used for milling and planing steel, or for turning stainless steel or super alloys.

Alloy-type cemented carbide grades can also be used for non-metal cutting purposes, mainly for the manufacture of wear-resistant parts.The grain size of these grades is usually 1.2-2-m, cobalt content is 7%-10%.In the production of these grades, a large proportion of recycled raw materials are usually added to obtain higher cost-effectiveness in the application of wear-resistant parts.Wear-resistant parts need to have high corrosion resistance and high hardness. When producing such grades, these properties can be obtained by adding nickel and chromium carbide.

In order to meet the dual requirements of tool manufacturers in terms of technology and economy, cemented carbide rods powder is a key element.The powder material designed for the processing equipment and process parameters of the tool manufacturer can ensure the performance of the finished workpiece and lead to the appearance of hundreds of cemented carbide grades.The recyclable characteristics of cemented carbide materials and the ability to directly cooperate with powder suppliers enable tool manufacturers to effectively control their product quality and material costs.

 

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Carbon Graphite Seals

2021-03-23 10:45:01 | 日記

Carbon graphite seal materials require high strength and a relatively high modulus of elasticity to withstand deformation at the interface.Carbon graphite seal materials provide the strength and rigidity which are especially important in high pressure, zero leakage mechanical end-face seals. High thermal conductivity is essential in removing heat from the interface.

 

Carbon graphite seal wear is a result of adhesive wear, chemical wear, erosive wear and sometimes radioactive wear. Carbon-graphite is inert to most chemical reagents so it survives where other materials fail. However, chemical Carbide Rods Hole wear is evidenced in certain strong oxidising environments or where the additives are attacked by specific oxidising reagents.

Applications of Carbon Graphite Seals

Carbon-graphite and graphites are excellent materials for aircraft turbine engine mainshaft seals. The mainshaft in a turbine engine rotates at very high speeds and operates in an environment of changing high temperature conditions. Mainshaft bearing compartment seals are used to protect rotor support bearings from hot gases flowing through the engine and to prevent the loss of lubricant in the bearing compartments.

In general, ROC carbon carbon/ graphite seals and bearings are used where extreme operating temperatures and/or corrosive fluids would cause conventional lubricants to decompose, tungsten carbide bars where lubricants would contaminate process fluids, and where equipment design makes conventional lubricating systems too expensive to install and maintain. Nonlubricating applications for which ROC Carbon supplies carbon/graphite grades include electrodes and brazing boats, jigs, and fixtures.

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customized tungsten carbide rod

2021-03-17 17:20:45 | Carbide Rods

Carbide round bar that is tungsten steel round bar, also known as tungsten steel bar, in simple terms is tungsten steel rod or carbide rods.

Tungsten steel round bar is a kind of carbide tungsten steel (WC) as the main raw material, coupled with other precious metals and paste phase by mining.It is widely used in the field of national production and processing by pressing the sintered high hardness and high strength alloy material by powder metallurgy method. Such as:PCB industry micro drill bit, photoelectric communication industry electrode rod, machining industry tungsten steel drill bit, drill handle, top, putter,Grinding precision parts, is the overall CNC milling cutter and hole processing tool preferred high-quality materials.

Recommend garde and application of tungsten carbide rods

Grade Grain size of WC(µm) Density(g/cm³) Hardness(HRA) Strength(TRS RN/mm²) Recommend application
TD06 - 14.35-14.55 91.3-92.3 3000 Adapt to ordinary alloy steel (HRC <45 °) and other materials processing
TD08 0.8 14.35-14.55 91.4-92.2 3000 For the production of drill, end mill, processing carbon steel, cast iron, stainless steel, heat-resistant steel and other materials processing
TX10 0.6 14.15-14.25 92-92.8 3500  Processing of nickel-base alloy, titanium alloy, stainless steel, die steel, alloy steel (45 °
TX12 0.6 14.15-14.25 92-92.8 3500 Comprehensive mechanical properties better than TX10, product life and excellent fracture resistance
TX15U 0.5 13.95-14.15 92.2-92.8 3500 Comprehensive mechanical properties better than TX12, suitable for high hardness stainless steel (50 °

 

 Features:
1, to high-quality ultra-fine tungsten carbide and imported cobalt powder as raw material.
2, the use of the world's advanced low-pressure sintering preparation technology for standardized production.
3, with high strength and high hardness.
4, with excellent red hardness, good wear resistance, high elastic modulus, high bending strength, good chemical stability (acid, alkali, high
Temperature oxidation), impact toughness is good, low expansion coefficient, thermal conductivity, conductive and iron and its similar characteristics of the alloy.
5, high-tech advanced equipment: 10MPa low-pressure sintering furnace sintering.
6, the unique new technology: vacuum high temperature and high pressure sintering. Products in the final stage of the use of pressure sintering, greatly reducing the porosity, mention
High density, greatly improving the mechanical properties of the product.
7, the product features: material grades, can be used for different use needs; complete specifications, rough size precision (reduce processing
Quantity, improve production efficiency).
8, service and thoughtful reaction: the next single production fast, fast delivery on time.

 

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carbide bar stock

2021-03-10 11:50:34 | 日記

carbide bar stock or strip has high hardness and high wear resistance, it is a ideal choice to used in cutting kinds of wood.

With high quality raw material and advanced equipment, Jingzuan provides customer superior quality carbide bar stock.
1.Easy to be brazed, good wear resistance and toughness.
2.Untrafine grain size raw material to keep excellent strength and hardness.
3.Both standard sizes and customizes sizes are available.

 Advantage:

1. Over 10 Years' efforts in making high quality carbide bar stock and strips, Almost 8 years in doing importing and exporting business.

2. Rich experience in grade researching, mould designing, automatic press, HIP sintered, surface treating and quality control.

3. We have many years of experience in producing the tungsten carbide rods and have gained a wide reputation in the market . Welcome your inquiry anytime . 

About carbide bar stock :

The main composition of tungsten carbide strips and bars  is tungsten carbide powders and cobalt powders .With its wear resistant and corrosion resistant ability , tungsten carbide nowadays is widely used in many areas such as : cutting tools , moulds , oil and automobile industry etc .  
 
Tungsten carbide strip is used as the cutter for the TCT woodworking knives for cutting all kinds of original wood , hard wood , HDF, MDF , plywood , particle board , laminated board, composite material ,grass, aluminum and metals . It can give much more excellent performance than HSS . 

About us:

Jingzuan Carbide Co., LTD.is a professional manufacturer of tungsten carbide products in zhuzhou city of China.With a wide range of products including carbide strips, STB blanks, carbide bar stock,carbide rods, carbide dies, carbide slitting saws, coated inserts, milling inserts ,end mills and many customized products. With a large selection of carbide grades for woodworking, metalworking, we also provide carbide materials for your special use. For more information about us, please visit our website(www.hao-carbide.com) or contact us directly . 

 

 

 

 

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Cemented Carbide

2021-03-08 11:54:24 | 日記

Cemented carbide is one of the strongest metals known to human beings. It is denser than lead and harder than steel. Cemented Carbide's unique combination of strength, hardness and toughness satisfies the most demanding applications.

An important feature of the cemented carbide is the potential to vary its composition so that the resulting physical and chemical properties ensure maximum resistance to wear, deformation, fracture, corrosion, and oxidation. Besides, a wide variety of shapes and sizes that can be produced using modern powder metallurgical processing offers tremendous scope to design cost-effective solutions to many of the problems of component wear and failure encountered in both the engineering and domestic environment rock drill bits.

In general, the super hard materials all suffer from lower toughness and poor resistance to sudden fracture, the cemented carbide have a unique combination of high hardness and good toughness within a wide range and thus constitute the most versatile hard materials group for engineering and tooling applications.

Chinatungsten Online develops cemented carbide technology to meet our present and future customer needs. Chinatungsten Online is dedicated to advancing Cemented Carbide technology in order to meet our customers' present and future needs. Every step in the manufacture of a Cemented Carbide component  from powder production to finishing  is crucial to ensure optimum performance. At Chinatungsten Online, we have full control of each processing step and in developing proprietary production processes that further improve our technological capabilities. We are trying our best to develop new products and new grades of Cemented Carbide that enhance our customers' operations through superior performance and reduced costs.

Production process:

1) Raw material
Sheelite or wolframite is the tungsten containing mineral. Ammonium-Para Tungsten is the beginning raw material of our production. The "Wet "process is the first step involving a sequence of dissolutions, precipitations and separations.

2) Reduction
After a hot reduction of the APT in hydrogen we obtain pure tungsten powder (W). By varying the reduction process the grain size of the tungsten power can be controlled within ca.1-20um

3) Carburization
Tungsten and carbon is mixed in the proper proportions. The mixture is heated at a high temperature in hydrogen under formation of tungsten carbide powder (WC)

4) Weighing-in of the ingredients
Different WC powder and binder Cobalt (Co) powder are looked as the raw material for the manufacturing of cemented carbide. After weighing-in of WC, Co and other additives to prescribed composition and cemented carbide grade, the mixture is wet milled.

5) Milling
The milling has effect on both carbide grain and homogeneity of the slurry. The milling procedure is important for achieving homogeneous cemented carbide after sintering.

6) Spray-drying
After milling the slurry must be dried, for example, by spray-drying to powder form. This "Ready-To-Press"(RTP) powder consists of spheric agglomerates of the constituents.

7) Blending test
The pressing properties and the composition of the RTP-powder are important for the following process. The size and shape of the RTP-powder are measured. Furthermore the powder must have good flow behaviors in order to uniformly fill the cavities of a press tool.

8) Compaction
The production of cemented carbide starts to press RTP-powder into compacts. Different methods of compaction RTP-powder:
-Uniaxial die pressing: gives high reproducibility in shape, relatively high fixed and low variable costs.
-Cold isostatic pressing(CIP): For products with shapes unsuited for uniaxial pressing, low fixed and high variable costs.
-Extrusion: For cemented carbide rods: high fixed and low variable costs.

9) Soft Machining
In some cases the compacts are soft machined or green shaped into a proper shape prior to sintering.

10) Sintering
The sintering is the final process step in which the cemented carbide get its properties as a high strength engineering material. The sintering process is performed at such high temperature so the molten binder could combine with the WC. The sintering could be done with or without high isostatic gas pressure (HIP)

11) Machining
After the sintering the compact has undergone shrinkage of ca.50 volume-%. Some CC-blanks are ready for dispatch after sintering. Most blanks are machined by different means, for example, EDM, turning, drilling, grinding,rock drill bits to make finished tool.

12) Quality Control
A quality control is performed of the cemented carbide pieces before shipment: dimension, shape and physical properties are checked before approval of the cemented carbide parts.

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