Applications
Primary application is as cutting tools for machining operations.
Equvialent
China GB standard grades W7Mo4Cr4V2Co5,
American AISI / ASTM standard M41,
United States UNS standard grade T11341,
International Organization for Standardization (ISO) standard grade HS2-9-1-8,
French NF standard grade HS7-4-2-5,
German DIN standard grade S74-2-5,
Germany DIN standard material number 1.3246,
British BS standard grade M41
Chemical composition
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) | Mo(％) | V(%) | W(%) | Co(%) |
| 1.05-11.5 | 0.15-0.50 | 0.20-0.60 | ≤0.030 | ≤0.030 | 3.75-4.50 | 3.25-4.25 | 1.75-2.25 | 6.25-7.00 | 4.75-5.75 |
Mechanical properties
| Yield Rp0.2 (MPa) |
Tensile Rm (MPa) |
Impact KV/Ku (J) |
Elongation A (%) |
Reduction in cross section on fracture Z (%) |
As-Heat-Treated Condition | Brinell hardness (HBW) |
| 439 (≥) | 931 (≥) | 41 | 41 | 13 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 221 |
Machinability
Machinability of M41 is rated at 55% that of the W group water hardening low alloy tool steels which are at 100% as a machinability reference.
Forming
Forming of the alloy may be done in the annealed condition be conventional methods.
Heat Treatment
Preheat at 1450 F and then rapidly heat to 2250 F. Hold parts for 2 to 5 minutes and air cool, salt bath or oil quench.
Annealing:
Anneal at 1600 – 1650 F and slow cool in the furnace at less than 40 F per hour.
Tempering:
Temper at 1000 to 1100 F for at least one hour at temperature. Repeating the tempering operation twice more, for a triple temper, is recommended. Rockwell C hardness will be in the range of 70 to 65.
Forging
Forge at 2100 F down to 1750 F. Do not forge below 1700 F.
Cold Working
Cold working of M41 in the annealed condition may be done by conventional methods.
