C55

High-Temp Steel

C55

Broad-spectrum corrosion-resistant Ni-base alloy. (DIN 17200; equiv UNS N06022 / ASTM B574). Nominal values—confirm mill certificate.

Chemical Composition (%)

CR20
MO12.5
FE2
W2.5

Mechanical Properties

Tensile:≥760 MPa;Yield:≥355 MPa

Chinese Standard

DIN 17200 C55

Equivalent Standards

ASTM B574

Equivalent Grades

UNS N06022

Applications

广谱耐蚀镍基合金。,"Plate

Available Forms

Bar"

Uses

Heat- and creep-resistant steel for elevated-temperature service with stable strength and oxidation resistance. Used in furnace parts, exhaust manifolds, turbine components, boiler tubes and engine valves.

Heat Treatment

Normally used in the solution-annealed or precipitation-hardened condition; stabilise/age per the grade (e.g., 650–800 °C ageing). Avoid long exposure in the sigma/475 °C embrittlement ranges.

Precautions

Maintain the recommended heat-treatment envelope; prolonged time in embrittlement ranges reduces ductility. Use descaling/protective atmosphere to limit scaling.

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