What material is m42
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M42 corresponds to the domestic brand W2Mo9Cr4Vco8, is the United States brand of super-hard cobalt high-speed tool steel, M42 vanadium mass fraction is not high (1%), the appropriate fraction of cobalt is high (8%), cobalt can promote carbide in the quenching heating more dissolved in the matrix, the use of high matrix hardness to improve wear resistance. The hardness, thermal hardness, wear resistance and grindability of the steel are very good. Heat treatment hardness can reach 67~70HRC, but there are also special heat treatment methods to obtain a hardness of 67~68HRC, so that its cutting performance (especially intermittent cutting) is improved, improve the impact toughness. The steel can be made into a variety of tools, cutting difficult to process materials when the effect is very good, and because of its good grinding performance, can be made into complex tools, but China's lack of cobalt resources, cobalt high-speed steel is expensive, about 5 to 8 times the ordinary high-speed steel.
Domestic cobalt high-speed steel in quenching hardness, heat hardening, performance and other aspects have been improved, close to or reached the level of imported steel. Hardness ≥67HRC after quenching and tempering, uniformity ≤±0.5%. Product specifications: φ10~150mm, hot rolled, forged round steel, rectangular steel, square steel, forgings, etc. Organize production according to GB/T9943-2008 standard or user requirements.
Superhard high-speed steel is developed on the basis of the difficulty in neutralizing high-carbon high-vanadium high-speed steel and high-carbon high-cobalt high-speed steel in order to meet the needs of processing difficult-to-cut materials, such as heat-resistant alloys. Generally, the hardness is ≥64HRC when used.
The process properties of the steel are better than M2Al, and the cold and hot processing properties are better. The hardness after quenching and tempering is the same as (66±1) HRC with M35 steel.
The steel has high abrasion resistance, high pressure resistance and sintering resistance.
M42 supply condition is annealing hardness ≤269HBW, cold drawing hardness ≤285HBW, cold drawing annealing hardness ≤277HBW.
The chemical composition of M42 is as follows: C1.10%, Si0.20%~0.40%, Mn0.20%~0.40%, Cr3.75%, Mo9.50%, V1.50%, Co8.00%.
M42 brand comparison relationship is as follows: American AISI standard M42 high speed steel, Chinese GB standard W2Mo9Cr4Vco8, Japanese JIS standard SKH55, Japanese HITACHI standard YXM42, Japanese NACHI standard HSD42, German DIN standard S2-10-1-8, German D IN standard material number 1.3247, Austria BOHLER standard grade S500.
M42 hot working specification: heating temperature 1090~1150℃.
M42 annealing standard: annealing temperature 840~870℃, furnace cold, hardness 235~369HBW.
M42 quenching and tempering specifications: preheating temperature 732~843℃, quenching temperature: salt bath furnace 1170℃, controlled atmosphere furnace 1188℃, oil, air or speech cooling, tempering temperature: 540~600/538℃, hardness 66HRC~69HRC/66HRC.
The main uses of M42 are as follows:
1) Suitable for making a variety of wear-resistant and impact-resistant tools for strong cutting.
2) Used to make a variety of high and ultra-hard saw blades, drills, taps, broach, hob and various milling cutters.
3) Used for advanced dies, screw dies and punches that require toughness and complex shapes.
4) For cold forging die and drawing die.
5) Recommended for use in cold stamping products industry such as watch case factory and screw factory.
