CA40 Stainless Steel Properties, Composition & Equivalent

CA40 ASTM A743      Grade(UNS):J91153        Alloy Family: Martensitic Stainless Steel      Equivalent: 420 stainless steel

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What is CA40 Stainless Steel ?

CA40 stainless steel is 420 “cutting tool grade” martensitic steel, similar to Brinell high chromium steel, the earliest stainless steel.It has a certain wear resistance and corrosion resistance, high hardness.

This kind of alloy has a certain degree of wear resistance and corrosion resistance, high hardness, its price is lower in stainless steel, suitable for the working environment with common requirements for stainless steel.

It is suitable for all kinds of precision machinery, bearings, electrical, equipment, instruments, transportation tools, household appliances, etc. It is mainly used for manufacturing parts resistant to atmospheric, steam, water and oxidizing acid corrosion.

CA40 ASTM A743

CA40 Chemical Composition

C Mn Si P S Cr Ni Mo
Max 0.40 1.00 1.50 0.04 0.04 14.0 1.0 0.50
Min 0.20 11.5

Heat treatment

(1) Heat to 1750°F [955°C] minimum, air cool and temper at 1100°F [595°C] minimum, or
(2) Anneal at 1450°F [790°C] minimum

Mechanical Properties

GradeCA40 ASTM A743
Reduction of Area, min / %25 %
Yield Strength, minKsi – 70, MPa – 485
Tensile Strength, minKsi – 110, MPa – 690
Elongation[50mm], min / %15 %


  • Good wear resistance
  • Good corrosion resistance
  • High hardness
  • The price is lower


  • Precision instruments
  • Bearing
  • Electrical equipment
  • Means of transportation
  • Household Electric Appliances
  • Corrosion resistant parts

CA40 equivalent

420 Stainless steel

420 equivalent to China’s 3Cr13 stainless steel pipe, with chromium content of 12-14%, minimum carbon content of 0.15%, and typical value of 0.31%. The UNs standard number of 420 stainless steel is S42000.

Characteristics and application of 420 stainless steel pipe: because the carbon content is about 0.31%, the hardness is higher than that of 2Cr13 (carbon content is about 0.20%) after quenching. It is used as cutting tool and nozzle. Valve seat, valve, etc.

However, because the content of Ni is only 0.75%, the corrosion resistance is limited, so 420 will rust.

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