SUS403

Stainless Steel

SUS403

Turbine-grade martensitic stainless. (JIS G4303; equiv ASTM 403 / JIS SUS403). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.15
CR11.5

Mechanical Properties

Tensile:≥480 MPa;Yield:≥275 MPa

Chinese Standard

JIS G4303 SUS403

Equivalent Standards

ASTM 403

Applications

汽轮机用马氏体。,Bar

Available Forms

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.

Uses

Annealing/quench from 980–1050 °C (oil or air) then temper 150–650 °C; lower temper gives higher hardness, higher temper improves toughness.

Heat Treatment

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.

Precautions

JIS SUS403

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