M35
M35 Grade Introduction:
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 Grade Application:
- Cutter
- Broach
- End milling cutter
- Advanced punching die
- Screw die
- Toughness and complex shape tools
- Reamer
- Milling cutter
M35 Equivalent Grades:
| Country |
USA |
German |
Japan |
| Standard |
ASTM A600 |
DIN EN ISO 4957 |
JIS G4403 |
| Grades |
M35 |
1.3243/HS6-5-2-5 |
SKh65 |
M35 Chemical Composition:
| Element |
C |
Cr |
Co |
Fe |
Mo |
Si |
W |
V |
| Content (%) |
0.93 |
4.2 |
4.9 |
76.52 |
5 |
0.3 |
6.25 |
1.9 |
Mechanical Properties:
| Yield Rpo2 (MPa) |
TensileRm (MPa) |
Impact KV/Ku (J) |
ElongationA (%) |
Reduction in cross-section on fractureZ (%) |
As-Heat-Treated Condition |
Brinell hardness(HBW) |
| 419 |
481 |
12 |
34 |
24 |
Solution and Aging, Annealing, Ausaging, Q+T, etc |
421 |
Physical Properties:
| Physical Properties |
Metric |
Imperial |
| Density |
8.14 g/cm3 |
0.294 lb/in3 |
Thermal Properties:
| Thermal Properties |
Metric |
Imperial |
| 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 |
Forging Properties:
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.
Stress Relieving:
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.