18Cr11NiMoNbVN

Stainless Steel

18Cr11NiMoNbVN

Medium-carbon martensitic, hardenable. (GB/T 20878; equiv ASTM 420 / EN 1.4021 / JIS SUS420J1 / GB 20Cr13). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.15
CR12

Mechanical Properties

Tensile:≥640 MPa;Yield:≥440 MPa;Hardness:≥50 HRC

Chinese Standard

T 20878 18Cr11NiMoNbVN

Equivalent Standards

ASTM 420

Equivalent Grades

EN 1.4021 / JIS SUS420J1 / GB 20Cr13

Applications

中碳马氏体，可淬硬。,"Bar

Available Forms

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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