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Molybdenum high-speed steels are designated as Group M steels according to the AISI classification system. Over 95% of high-speed steels manufactured in the US are group M steels. Tungsten is present in all types from M1 to M10, except M6, and cobalt is not present in any of these steels. Molybdenum high-speed steels have similar performance when compared to tungsten high-speed steels. However, the initial cost of molybdenum tool steels is lower. Titanium nitride, titanium carbide, and several other coatings can be used in tools made of this kind of steel through a physical vapor deposition process to improve the performance and life span of the tool.
M35 high-speed steel is the main feature containing Co general cutting tool steel, quenching hardness is 1200-1240 c. Furthermore, M2 was used in the cutter, broach, end milling cutter. For manufacturing strong cutting with wear-resistant, resistant to impact a variety of tools, advanced punching die, screw die, the toughness and complex shape tools, reamer, milling cutter, bunt, punch, etc
|Standard||ASTM A600||DIN EN ISO 4957||JIS G4403|
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, OHNS, D2, D3, H-11, H-13, CW-1, M2, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.
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The following table shows the chemical composition of M35 steel:
|Yield Rpo2(MPa)||Tensile Rm(MPa)||Impact KV/Ku(J)||Elongation A(%)||Reduction in cross-section on fracture Z(%)||As-Heat-Treated Condition||Brinell hardness (HBW)|
|419||481||12||34||24||Solution and Aging, Annealing, Ausaging, Q+T, etc||421|
|Hardness, Rockwell C (oil quenched from 1232°C, 5 mins)||64.8||64.8|
|Hardness, Rockwell C (oil quenched from 1177°C, 5 mins)||65.2||65.2|
|Hardness, Rockwell C (oil quenched from 1204°C, 5 mins)||65.2||65.2|
|Modulus of elasticity||207 GPa||30000 ksi|
|Machinability (1% carbon steel)||45.0 – 50.0%||45.0 – 50.0%|
Heat treatment temperatures, including the rate of heating, cooling, and soaking times will vary due to factors such as the shape and size of each M35 steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium, and workpiece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of high-speed steels.
For best results harden in a vacuum or controlled furnace, or in a properly rectified salt bath. Pre heat thoroughly in two steps to 450-500°C, then to 820-870°C, transfer to the high-temperature salt bath or furnace. The exact hardening temperature to use for M35 will depend on the type of work being treated, but in general, components should be hardened from the range of 1050-1250°C.
M35 high-speed steel components can be tempered between 510-620°C. Triple tempering is recommended with a minimum of two hours at temperature per cycle. The component should be cooled in still air to room temperature between tempering treatments.
The physical properties of M35 molybdenum high-speed tool steels are given in the following table.
|Density||8.14 g/cm3||0.294 lb/in3|
The following table shows the thermal properties of M35 molybdenum high-speed tool steels.
|CTE, linear (@21 – 399°C / 69.8 – 750°F)||11.4 μm/m°C||6.33 μin/in°F|
|CTE, linear (@21 – 593°C /69.8 – 1100°F)||11.5 μm/m°C||6.39 μin/in°F|
Preheat the M35 high-speed steel slowly and uniformly to 450-500°C and equalize. Then increase more quickly to the forging temperature of 950-1100°C and equalize prior to forging. Do not allow the forging temperature to drop below 950°C, if this occurs reheating will be necessary. Always cool the steel very slowly after forging.
If tools produced from M35 high-speed steel are heavily machined or ground it is recommended to stress relief after machining and prior to hardening to minimize the possibility of distortion. To stress relieve heat the component to 600-700°C and soak well (approx 2 hours) Cool slowly in the furnace. The tools can be finish machined before heat treatment.
M35 is supplied in the annealed and machineable condition. Re annealing will only be necessary if the steel has been hot worked, forged, or hardened by the toolmaker. Heat the M35 high-speed steel to 850°C at a rate of no more than 220°C per hour.
M35 is supplied in the annealed and machinable condition. Re annealing will only be necessary if the steel has been hot worked, forged, or hardened by the toolmaker. Heat the M35 high-speed steel to 850°C at a rate of no more than 220°C per hour. Always hold at temperature for one hour per 25mm of a thickness (with two hours being minimum). The furnace cools slowly. The M35 annealed hardness achieved should be 260 Brinell or lower.
|Density||8.14 g/cm3||0.294 lb/in3|