Alloy33

Stainless Steel

Alloy33

Cr-base corrosion resistant alloy. (UNS R20033; equiv Alloy 33 / UNS R20033). Nominal values—confirm mill certificate.

Chemical Composition (%)

C0.02
CR19.5
NI17.5
MO6
N0.18
CU0.5

Mechanical Properties

Tensile:≥650 MPa;Yield:≥300 MPa

Applications

6Mo超级奥氏体，极强耐点蚀。,Plate

Available Forms

Austenitic stainless steel with excellent corrosion resistance, formability and weldability; non-magnetic in annealed condition. High nickel (≈18%) stabilises the austenite and improves toughness and pitting resistance. Molybdenum (≈6.25%) 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 R20033 Alloy33 / Alloy 33 / UNS R20033

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