Nitronic33

Stainless Steel

Nitronic33

Specialty steel grade. tainless steel. (UNS S20400; equiv Nitronic 33). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.06
CR20.5
NI11.5
MO1.5
N0.2
MN4

Mechanical Properties

Tensile:≥860 MPa;Yield:≥485 MPa

Applications

高氮奥氏体不锈钢。,Bar

Available Forms

Austenitic stainless steel with excellent corrosion resistance, formability and weldability; non-magnetic in annealed condition. High nickel (≈12.5%) 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

UNS S20400 Nitronic33 / Nitronic 33

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