CA6N Stainless Steel Properties, Composition & Equivalent

CA6N ASTM A743 A487          Grade(UNS):J91650      Alloy Family: Martensitic Stainless Steel

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What is CA6N Stainless Steel ?

The CA6N is a modified version of F6NM. This alloy steel contains about 11% Cr-7% Ni and the stated mechanicals are 140 Ksi min UTS and 135 Ksi min YS with 15% min elongation. This is an age-hardening martensitic stainless steel with aging performed at 800 ℉

CA6N alloy structural steel is developed on the basis of non-alloy steel (carbon steel) by adding an appropriate amount of one or several alloy elements. Alloy structural steel is mainly used to manufacture mechanical parts with high stress, which is widely used.  


CA6N Chemical Composition

C Mn Si P S Cr Ni
Max 0.06 0.50 1.00 0.02 0.02 12.5 8.0
Min 10.5 6.0

Heat treatment

Heat to 1900°F [1040°C], air cool, reheat to 1500°F [815°C], air cool, and age at 800°F [425°C], holding at each temperature sufficient time to heat casting uniformly to temperature

Mechanical Properties

Reduction of Area, min / %50 %
Yield Strength, minKsi – 135, MPa – 930
Tensile Strength, minKsi – 140, MPa – 965
Elongation[50mm], min / %15 %


  • Very high tensile strength
  • Higher corrosion resistance than ordinary martensitic stainless steel
  • Very high stress resistance


  • High stress mechanical parts
  • Stretch fitting
  • Mining equipment
  • Welding Kit


Any welding of CA6N will have an adverse effect on the strength of the matrix because it is age hardening. Therefore, welding should be carried out under the condition of minimum preheating and strict control of interlayer temperature, without post-weld heat treatment. The UTS and ys of 410nimo are 110 Ksi min, 91 Ksi min, and 17% respectively. But, these attributes are set to post-weld heat treatment of 1150 degrees Fahrenheit after welding, so you will not be able to perform such welding operations on this kind of stainless steel

My suggestion is to use er410nimo filler metal specimens and to perform ASME section IX bending and tensile tests. I don’t think the bending test is a problem. The tensile results will be self-evident.

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