CN3MN Stainless Steel Properties, Composition & Equivalent

CN3MN ASTM A743 A744             Grade(UNS): N08367           Alloy Family: Austenitic Stainless Steel           Equivalent: AL6XN alloy

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What is CN3MN Stainless Steel ?

CN3MN is a martensitic stainless steel produced according to ASTM standard, the term is low alloy high strength structural steel, standard number: ASTM A743 A744. This kind of stainless steel belongs to low carbon austenitic stainless steel and has excellent resistance to corrosion (chloride and crevice) in acid, alkali, and salt solutions. In addition, it has pitting corrosion resistance and good corrosion resistance.

The alloy has excellent mechanical properties and overcomes the defects of high carbon steel. It can be used in centrifugal casting under fatigue and low-temperature environment.

At the same time, It is also a super austenitic stainless steel with good corrosion resistance, especially in seawater.


CN3MN chemical composition

C Mn Si P S Cr Ni Mo Copper Nitrogen
Max 0.03 2.0 1.00 0.04 0.01 22.0 25.5 7.0 0.75 0.26
Min 20.0 23.5 6.0 0.18

Heat treatment

Heat to 2100°F [1150°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 – 38, MPa – 260
Tensile Strength, minKsi – 80, MPa – 550
Elongation[50mm], min / %35%


  • Strong resistance
  • Excellent corrosion resistance
  • Good resistance for high chloride aqueous solution


  • Offshore platform equipment
  • Nuclear industry
  • Pharmaceutical equipment
  • Paper industry
  • Food industry equipment
  • Flue gas pipeline lining

CN3MN Equivalent

AL6XN super austenitic stainless steel

AL6XN is a typical super austenitic stainless steel. It has strong resistance to pitting corrosion, crevice corrosion, and stress corrosion, and its cost is lower than that of corrosion-resistant nickel base alloy.

AL6XN alloy exhibits good corrosion resistance in various severe corrosion environments and is suitable for high chloride aqueous solution and chloride corrosion environment. Used in a variety of high chloride environments: bleaching agents, halogens, and salts or chemicals with high seawater content.

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