CA6NM Stainless Steel Properties, Composition & Equivalent

CA6NM A743 A487 A757          Grade(UNS): J91540         Alloy Family: Martensitic Stainless Steel        Equivalent: F6NM Alloy

What is CA6NM Stainless Steel ?

CA6NM belongs to martensitic stainless steel, also called hydroelectric steel. Molybdenum is added under quenching and tempering conditions to prevent rust. Due to its good toughness, it can be used at temperatures ranging from -60 ℃ to +300 ℃.

Execution Standard: ASTM A743 / A487 / A757

CA6NM stainless steel is generally divided into three heat treatment conditions, QT650, QT780, and QT900. This material is used in the petroleum industry and in the construction of power plants.

This material is a good polish. Good corrosion resistance in a corrosive environment without chloride. Surface condition plays a large part in corrosion resistance. The polished surface is much better than the rough surface. It can be hardened by maintaining a temperature between 950 ℃ and 1050 ℃, and then cooled in air or polymer. The strength of this stainless steel depends on the tempering temperature.

CA6NM ASTM A743
CA6NM

CA6NM chemical composition

C Mn Si P S Cr Ni
Max 0.06 1.00 1.00 0.04 0.03 14.0 4.5
Min 11.5 3.5

Heat treatment

Heat to 1850°F [1010°C] minimum, air cool to 200°F [95°C] or lower prior to any optional intermediate temper and prior to the final temper.

The final temper shall be between 1050°F [565°C] and 1150°F [620°C].

Mechanical Properties

GradeCA6NM ASTM A743
Reduction of Area, min / %35 %
Yield Strength, minKsi – 80, MPa – 350
Tensile Strength, minKsi – 110, MPa – 775
Elongation[50mm], min / %15 %

Features

  • High abrasion resistance
  • Strong corrosion resistance
  • Well tear resistance 
  • High hardness
CA6NM microstructure
CA6NM microstructure

Applications

1. Roller screen rolls for the iron ore pelletizing industry 

2. Subsequent pellet processing operation in the steel industry

Results of materials testing
Chemical Analysis (%)
    Pipe No.CSiMnPSNiCrMo 
CA-6NM≤ 0.06≤ 1.00≤ 1.00≤ 0.04≤ 0.033.5 – 4.511.5 -14.00.4 – 1.0 
ZG06Cr13Ni4Mo≤ 0.06≤ 0.80≤ 1.00≤ 0.035≤ 0.0253.5 – 5.011.5 -13.50.4 – 1.0 

The role of various alloys in CA-6NM

It is belongs to martensitic stainless steel, also called hydroelectric steel. Molybdenum is added under quenching and tempering conditions to prevent rust. Due to its good toughness, it can be used at temperatures ranging from -60 ℃ to +300 ℃. Read more

The steel pipe not only has good corrosion resistance, weldability, but also has high strength and low-temperature toughnessIt belongs to low carbon martensite stainless steel, used for hydropower facilities and mine facilities of the wear parts. Such as turbine blades, turbine, roller screen/feeder.

There are usually three ways of heat treatment for this martensitic stainless steel

  • High-temperature tempering
  • modulation (quenching + high-temperature tempering)
  • quenching + low-temperature tempering
  • Read more about it

The equivalent grades are as following, read more about it

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