M42
Alloy SteelM42
(ASTM A600). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 1.05 |
|---|---|
| W | 1.15 |
| MO | 9 |
| CR | 3.5 |
| V | 0.95 |
| CO | 7.75 |
| P | 0.03 |
| S | 0.03 |
Mechanical Properties
Hardness(annealed):≤269 HB;Hardness(hardened):66-70 HRC
Chinese Standard
ASTM A600 M42
Available Forms
Bar,Plate
Uses
Nickel/cobalt-base superalloy retaining high strength, creep and corrosion resistance at extreme temperature. Cobalt (≈8.25%) raises hot corrosion and wear resistance. Used in gas-turbine blades, aero-engine hot sections, combustors and advanced energy systems.
Heat Treatment
Solution treated 1050–1250 °C and aged (≈700–900 °C) to precipitate γ′/γ″ strengtheners; processed via vacuum induction + VAR/ESR for cleanliness.
Precautions
Machining is difficult — use ceramic/PCBN tools, generous coolant and rigid setups. Keep clean (vacuum/inert melting) to avoid inclusions; avoid contamination by low-melting elements.
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