Y12Cr18Ni9

Stainless Steel

Y12Cr18Ni9

Free-machining austenitic stainless steel. (GB/T 20878; equiv ASTM 303 / EN 1.4305 / JIS SUS303). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.15
CR17
NI8
S0.15

Mechanical Properties

Tensile:≥620 MPa;Yield:≥240 MPa;Elong:≥35%

Chinese Standard

T 20878 Y12Cr18Ni9

Equivalent Standards

ASTM 303

Equivalent Grades

EN 1.4305 / JIS SUS303

Applications

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Available Forms

Rod"

Uses

Austenitic stainless steel with excellent corrosion resistance, formability and weldability; non-magnetic in annealed condition. High nickel (≈9%) stabilises the austenite and improves toughness and pitting resistance. Used in food processing, chemical plant, architecture, heat exchangers, kitchenware and medical devices.

Heat Treatment

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).

Precautions

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.

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