Which is more expensive HSS M42 vs M2

M42 is much more expensive, HRC66 or more, M2 is equivalent to 6542 in China and SKH51 in Japan. The heat treatment hardness is around 62.

M42 is much more expensive than M2.

M2 is equivalent to 6542 domestically, 51 SKH51 in Japan

M2 High Speed Steel Chemical Composition:

Carbon C: Silicon Si:

Manganese mn:sulfur s:

Phosphorus p:

Chromium Cr: Nickel Ni: Promised Residual Content

Copper cu: Promised residual content

Vanadium V: Molybdenum Mo:

Tungsten W:AISI M2 High Speed Steel Mechanical Properties:

Hardness: Delivery Hardness: (annealed) 262HB. Sample heat treatment system and quenching and tempering hardness: 60HRC

M42 steel (W2MO9CR4VCO8) is a high-cobalt toughness high-speed steel, which is mainly used for high-toughness precision wear-resistant hardware cold stamping die, and can also be used for cooling in cutting tools and knives. The steel has high hardness, up to 70HRC, good hot hardness, high temperature hardness, and easy grinding.

The cutting tools made of this steel can cut iron-based superalloys, cast superalloys, titanium alloys and ultra-high-strength steels, etc., but the toughness is slightly poor, and the lower limit should be used for quenching. Due to its good grinding performance, it can be used to manufacture a variety of high-precision and complex tools.

The order from bad to good is M2, M25, M42 M35 is based on M2 with the addition of 5% Co cobalt content. On the basis of M35, the W content of M42 was significantly reduced, and the Mo content was increased to about 8%. In terms of physical properties, M35 has increased toughness, hardness and wear resistance compared with M2.

At the same time, the high-temperature resistant element cobalt also makes the drill bit perform well. The hardness of M42 has been greatly improved, and the overall performance is better than that of M35.

Extended information: 1) M2 is molybdenum high-speed steel, which has the advantages of small carbide inhomogeneity and high toughness. It is easy to overheat, so the quenching heating temperature should be strictly controlled, and the heat treatment protection requirements are strict. Due to its good hardness and wear resistance, it is mostly used to make tools that cut difficult materials.

M2 high-speed steel has a large carbide tendency, so it has strict requirements for heat treatment protection, and is suitable for molds that bear vibration and impact loads. Hardness: 63 Main Uses Cold forging die, fine stamping die, powder pressing die, etc., shearing machine die, plastic mold with glass fiber, etc.

2) Molds suitable for bearing vibration and impact loads: deep-drawn dies, punching dies. Metal cutting saw blades, cold heading and extrusion tools, etc.

M35 high-speed steel M35 cobalt-containing high-speed steel is cheaper and easier to process, through proper heat treatment, high hardness (HRC67 70), high red hardness (625 4 hours, HRC63 65) and high wear resistance, toughness and bending strength are not lower than ordinary high-speed steel, which can overcome early damage such as die edge collapse and chipping.

The main characteristics of M35 high-speed steel are mold steel containing CO general cutting tools, and the quenching hardness is 1200-1240C. The main uses are hobs, broaches, and end mills.

3) Factory condition: spheroidized annealing<225 Characteristics and application: This steel is tungsten steel high-speed.

It is suitable for the manufacture of wear-resistant and impact-resistant tools for powerful cutting, advanced dies, screw dies, tools with toughness and complex shapes, reamers, milling cutters, iron heads, punches, etc. Forging temperature: 1100 900 Annealing temperature:

Heat to 800 850, stay at this temperature for 2 4 hours, and let it cool down in the furnace.

The order from bad to good is M2, M25 and M42

M35 is supplemented with 5% CO and cobalt content on top of M2.

On the basis of M35, the W content of M42 decreases significantly, and the Mo content increases to about 8%.

In terms of physical properties, M35 has higher toughness, hardness and wear resistance than M2. At the same time, the high-temperature resistant element cobalt also makes the drill bit perform well.

The hardness of M42 is greatly improved, and the comprehensive performance is better than that of M35.

Extended information: High speed steel performance characteristics:

High-performance high-speed steel has good hardness and hot hardness, and is a new variety developed by changing the chemical composition of high-speed steel to improve its performance. High-performance high-speed steel has high hardness and hot hardness. When the cutting temperature reaches 650, the hardness can still be maintained above 60HRC.

The durability is twice that of ordinary high-speed steel. It is suitable for the manufacture and processing of difficult-to-machine materials such as high-temperature alloys, stainless steels, titanium alloys, and high-strength steels. There are four main varieties of high-performance high-speed steel:

High-carbon high-speed steel, high-vanadium high-speed steel, cobalt-containing high-speed steel and aluminum high-speed steel.

1. High-carbon high-speed steel.

The brand name is 9W18Cr4V. Due to its high carbon content (, it has good hardness, wear resistance and hot hardness. When cutting difficult-to-machine materials such as stainless steel and heat-resistant alloys, the service life of the tools manufactured by it is significantly improved, but its flexural strength is 3000MPa, the impact toughness is low, and the heat treatment process is strict.

Second, the high vanadium system.

Brands include W12Cr4V4Mo and W6Mo5Cr4V3 (American brand M3) with a vanadium content of 3-4%, which greatly improves wear resistance, but deteriorates grindability. The use and development of high-vanadium high-speed steel also relies on the development of grinding technology and grinding wheel technology.

3. Cobalt high-speed steel.

The brand is W2MO9CR4VCO8 (American brand M42). The properties of this high-performance high-speed steel are characterized by a low vanadium content (1%) and a high cobalt content (8%). During quenching and heating, cobalt can promote more dissolution of carbides in the matrix and take advantage of high matrix hardness to improve wear resistance.

Fourth, this kind of high-speed steel has good hardness, hot hardness, wear resistance and grindability. The heat treatment hardness can reach 67-70HRC, but special heat treatment methods are also used to obtain 67-68HRC hardness to improve its cutting performance (especially interrupted cutting) and improve impact toughness. Cobalt HSS can be made into a variety of tools for cutting difficult-to-machine materials.

Due to its good grinding performance, it can be made into complex tools and has been widely used in the world. However, China lacks cobalt resources, and cobalt high-speed steel is expensive, about 5-8 times that of ordinary high-speed steel.

What is the difference between M35 and M42 for stainless steel drill bits?

1. The processing difficulty is differentCompared with M42**, M35 cobalt-containing high-speed steel is cheap and easy to process, through proper heat treatment, high hardness (HRC67 70), high red hardness (625 4 hours, HRC63 65) and high wear resistance, toughness and flexural strength are not lower than ordinary high-speed steel, which can overcome early damage such as die edge collapse and chipping.

2. The characteristics are differentM35 steel is an internationally used cobalt-containing ultra-hard high-speed steel with high wear resistance, high pressure resistance and sintering resistance. Later, the cobalt-free cheap superhard high-speed steel M2AL was developed in China to replace the superhard high-speed steel M35 and M42 steel.

3. The application is different: The process performance of M2Al steel is better than that of M35, and it is easy to be processed in cold and hot heat; After quenching and tempering, the hardness is the same as that of M35 and M42, which are (66 1) HRC and (67 1) steel (W2Mo9Cr4VCO8) respectively, which are high cobalt toughness high-speed steel, which is mainly used for high toughness precision wear-resistant hardware cold stamping die, and can also be used for cooling in cutting tools and knives.

Cobalt-containing drill bits

Cobalt-containing drill bits are drill bits containing the chemical element cobalt co., generally added to the raw materials of high-speed steel, and the purpose of adding cobalt is to improve the high temperature resistance and anti-grinding characteristics of the drill bit, so as to achieve the purpose of drilling. In practice, it is generally used for processing stainless steel, copper and aluminum products.

These products all have the characteristics of high strength, that is, poor plasticity. In the process of drilling these materials, the discharged cutting is attached to the drill bit, and in order to solve this problem, later generations invented the cobalt-containing drill bit.

The chemical composition of M35 is W6Mo5Cr4V2Co5 and the chemical composition of M42 is W2Mo9Cr4VCO8. Both are cobalt high-speed steels, which are characterized by thermal stability and high hardness at high temperatures. Cobalt high-speed steel is brittle, so it is not suitable for use under the conditions of intermittent cutting or poor rigidity of machine tools, or to make tools with thin edges and complex shapes.

The disadvantage is that the carbide inhomogeneity increases, and the decarburization sensitivity increases with the increase of cobalt content.

High-speed steel generally does not do tensile strength testing, but mainly metallographic and hardness testing. After the correct heat treatment, the Rockwell hardness of tungsten and molybdenum high speed steel can reach more than 63, and the cobalt high speed steel can reach more than 65. The acid-leached low-power tissue of steel shall not have visible shrinkage porosity and peeling.

The center is loose, and the general porosity should be less than grade 1. The contents of metallographic examination mainly include three items: decarburization layer, microstructure and carbide inhomogeneity. There should be no significant decarburization of high-speed steel.

The microstructure must not have fishbone-like eutectic Leester. Carbide inhomogeneity has the greatest impact on quality in high-speed steel, and the metallurgical and mechanical departments currently attach great importance to the level of carbide inhomogeneity. Depending on the use of the steel, different grades of carbide inhomogeneity can be required, which should usually be less than grade 3.

In addition to its high hardness, high wear resistance and sufficient toughness, there is also an important factor in the manufacture of cutting tools with high-speed steel. Red hardness refers to the ability of the cutting edge to resist softening in a red-hot state when cutting at high speeds. One way to measure the red hardness is to heat the steel to 580 650, keep it warm for 1 hour, and then cool it, so that the hardness value is measured after 4 times.

The quenching temperature of high-speed steel is generally close to the melting point of steel, such as 1210 1240 for tungsten high-speed steel and 1180 1210 for high-molybdenum high-speed steel. After quenching, it is generally necessary to temper between 540 and 560 3 times. Increasing the quenching temperature can increase the red hardness of the steel.

In order to improve the service life of high-speed steel tools, their surfaces can be strengthened, such as low-temperature cyanidation, nitriding, sulfur nitriding, etc.