Lapis

Stainless Steel

Lapis

Specialty steel grade. tainless steel. (AMS 5629; equiv Lapis / 13-8Mo). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.05
CR12.25
NI7.5
MO2
AL0.9

Mechanical Properties

Tensile (H1000):≥1345 MPa;Yield:≥1275 MPa;Elong:≥12%

Chinese Standard

AMS 5629 Lapis

Equivalent Standards

13-8Mo

Applications

马氏体PH，高韧高强。,Bar

Available Forms

Austenitic stainless steel with excellent corrosion resistance, formability and weldability; non-magnetic in annealed condition. High nickel (≈8%) stabilises the austenite and improves toughness and pitting resistance. Molybdenum (≈2.25%) enhances resistance to chloride pitting and crevice corrosion — suited to marine and chemical service. Used in food processing, chemical plant, architecture, heat exchangers, kitchenware and medical devices.

Uses

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).

Heat Treatment

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.

Precautions

Lapis

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