Chemical Composition of M42 Tool Steel Material
| ASTM A681 | C | Si | Mn | P | S | Cr | Mo | V | w | Co |
| M42/ T11342 | 1.05～1.15 | 0.15～0.65 | 0.15～0.40 | 0.030 Max | 0.030 Max | 3.50～4.25 | 9.00～10.00 | 0.95～1.35 | 1.15～1.85 | 7.75～8.75 |
| DIN 17350 | C | Si | Mn | P | S | Cr | Mo | V | w | Co |
| 1.3247/S2-10-1-8 | 1.05～1.15 | ≤0.70 | ≤0.40 | 0.030 Max | 0.030 Max | 3.50～4.50 | 9.00～10.00 | 0.90～1.30 | 1.20～1.90 | 7.50～8.50 |
| GB/T 1299 | C | Si | Mn | P | S | Cr | Mo | V | w | Co |
| W2Mo9Cr4VCo8 | 1.05～1.15 | 0.15～0.65 | 0.15～0.40 | 0.030 Max | 0.030 Max | 3.50～4.25 | 9.00～10.00 | 0.95～1.35 | 1.15～1.85 | 7.75～8.75 |
| JIS G4403 | C | Si | Mn | P | S | Cr | Mo | V | w | Co |
| SKH59 | 1.05～1.15 | ≤0.70 | ≤0.40 | 0.030 Max | 0.030 Max | 3.50～4.50 | 9.00～10.00 | 0.90～1.30 | 1.20～1.90 | 7.50～8.50 |
M42 Tool Steel Material Equivalent and Related Speciations
| USA | German | Japan | China | ISO |
| ASTM A681 | DIN 17350 | JIS G4403 | GB/T 1299 | ISO 4957 |
| M42 | 1.3247 | SKh59 | W2Mo9Cr4VCo8 | HS 2-9-1-8 |
SAE M42 Tool Steel Material Mechanical Properties
Hardness, Rockwell C (oil quenched on 1204°C, 5 minutes): 63 HRC.
Hardness, Rockwell C (oil quenched on 1177°C, 5 minutes): 65.5 HRC
Hardness, Rockwell C(oil quenched on 1163°C), 5 minutes: 65.8 HRC
Forged of M42 Steel metal material
At first, Pre-Heating to 650-750℃,Then heat to forged temperature.
Next, Soak at 1050-1100 °C , ensure heat thorough. Then start
forged, the forged temperature no low than 950℃. After forging,
cool slowly .
Heat Treatment of SAE M42 Steel
M42 HSS Steel Annealing
Firstly, Slowly heat to 870℃,then slowly Cool to 538℃(1000℉) in
heat treatment furnace. Then cool in air. After annealing hardness
HBS: 269 Max
M42 tool Steel Hardening
M42 steel having very high hardenability and should be hardened by
cooling in still air. The use of a salt bath or controlled
atmosphere furnace is desirable to minimize decarburization, and if
not available, pack hardening in spent pitch coke is suggested.
Finally, the temperature employed is usually 1800°-1850°F,
depending on size section.
Quenching of HSS M42 Steel material
Quenching temperature / ℃ | salt bath furnace: 1177
Quenching temperature / ℃ | controlled atmosphere furnace: 11188
The heat preservation time/min: 5 ~ 15
Quenching medium: air cooling
Tempering Of HSS M42 Tool Steel
Tempering temperature / ℃ : 538
After tempering hardness HRC or higher: 66
