444

Stainless Steel

444

High-temp martensitic, turbine blades. (ASTM A276; equiv ASTM 422 / JIS SUS422). Nominal values—confirm mill certificate.

Chemical Composition (%)

C	0.2
CR	11
NI	0.5
MO	0.9
W	0.9

Mechanical Properties

Tensile:≥900 MPa;Yield:≥700 MPa

Chinese Standard

ASTM A276 444

Equivalent Standards

ASTM 422

Applications

高温马氏体，汽轮机叶片。,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 SUS422

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