CK20 Stainless Steel Properties, Composition & Equivalent

CK20 ASTM A743 A351             Grade(UNS): J94202           Alloy Family: Austenitic Stainless Steel           Equivalent: 310 stainless steel

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What is CK20 Stainless Steel ?

CK20 is a kind of soft austenitic steel alloy has high oxidation resistance. Which is used in sulfite solution and dilute sulfuric acid at room temperature.

This kind of stainless steel has high strength, less quenching and no temper embrittlement. It can be used in parts with low stress and high toughness requirements.

CK20 stainless steel alloy is generally used in mechanical parts and automobile manufacturing to produce parts with high surface requirements and low center requirements

CK20 ASTM A743 /A743M

CK20 chemical composition

C Mn Si P S Cr Ni
Max 0.20 2.00 2.00 0.04 0.04 27.0 22.0
Min 23.0 19.0

Heat treatment

Heat to 2000°F [1093°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid
cool by other means

Mechanical Properties

Reduction of Area, min / %
Yield Strength, minKsi – 28, MPa – 195
Tensile Strength, minKsi – 65, MPa – 450
Elongation[50mm], min / %30 %


  • Higher strength
  • Less quenching
  • High surface toughness
  • High oxidation resistance


  • Petroleum industry
  • Electronic product
  • Chemical industry
  • Food industry
  • Aerospace
  • Military project

CK20 Equivalent

310 Stainless steel

310 stainless steel is austenitic chromium-nickel stainless steel.
It has good oxidation resistance and corrosion resistance. The strength of 310 stainless steel is higher due to its high chromium and nickel content. 310 stainless steel can work at high temperature and has good high temperature resistance.

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