SUS440C
Alloy SteelSUS440C
(JIS G4303). Nominal values—confirm mill certificate.
Chemical Composition (%)
| C | 0.95 |
|---|---|
| SI | 1 |
| MN | 1 |
| P | 0.04 |
| S | 0.03 |
| CR | 16 |
| MO | 0.75 |
Mechanical Properties
Tensile:≥760 MPa;Yield:≥450 MPa;Hardness(hardened):≥58 HRC
Chinese Standard
JIS G4303 SUS440C
Available Forms
Bar,Plate
Uses
Martensitic stainless steel combining moderate corrosion resistance with high strength and hardness after heat treatment. Used for cutlery, surgical instruments, turbine blades, valves, pumps, fasteners and bearings in mildly corrosive environments.
Heat Treatment
Annealing/quench from 980–1050 °C (oil or air) then temper 150–650 °C; lower temper gives higher hardness, higher temper improves toughness.
Precautions
Preheat and post-weld heat treat to avoid hydrogen cracking; soft anneal before heavy machining. Lower corrosion resistance than austenitic grades — not for strong chlorides.
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