07Cr17Ni7Al

Stainless Steel

07Cr17Ni7Al

Semi-austenitic precipitation-hardening, spring applications. (GB/T 20878; equiv ASTM 631 / AMS 5673 / JIS SUS631 / GB 07Cr17Ni7Al). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.09
CR16
NI6.5
AL0.75

Mechanical Properties

Tensile (TH1050):≥1310 MPa;Yield:≥1170 MPa

Chinese Standard

T 20878 07Cr17Ni7Al

Equivalent Standards

ASTM 631 / AMS 5673

Equivalent Grades

Weld with low-carbon or stabilized filler (e.g., 316L, 347) to avoid sensitization; passivate after fabrication. Not hardenable, but work-hardens rapidly — use sharp tools and rigid setups. Avoid chloride contact for 304 in warm service; specify 316/317 for marine or aggressive media.

Applications

半奥氏体沉淀硬化，弹性件。,"Sheet

Available Forms

Bar

Uses

Strip"

Heat Treatment

Austenitic stainless steel with excellent corrosion resistance, formability and weldability; non-magnetic in annealed condition. High nickel (≈7.125%) stabilises the austenite and improves toughness and pitting resistance. Used in food processing, chemical plant, architecture, heat exchangers, kitchenware and medical devices.

Precautions

Solution anneal 1010–1150 °C followed by rapid water quench to retain austenite; not hardenable by heat treatment. Sensitization avoided by low carbon or stabilizers (Ti/Nb).

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