CA6NM heat treatment

Process and temperature of CA6NM heat treatment

CA6NM Heat treatment

There are usually three ways of heat treatment for CA6NM martensitic stainless steel

  • High-temperature tempering
  • modulation (quenching + high-temperature tempering)
  • quenching + low-temperature tempering
CA6NM ASTM A743

Since martensite will be produced after air cooling, CA6NM is not suitable for cutting, so it must be softened by heat treatment before machining. CA6NM heat treatment can be divided into high-temperature tempering and complete annealing

High-temperature tempering

Alloy is heated to 1850 ° f [1010 ° C], held for 2-4 hours, and then air cooled to 200 ° f [95 ° C] or less to transform martensite into tempered sorbate. The final tempering temperature shall be between 1050 ° f [565 ° C] and 1150 ° f [620 ° C].

Full annealing

Alloy is heated to 1800 ° f [982 ° C], held for 2-4 hours, and cooled with the furnace at a slow rate, approximately 20-25 ° C / h. After cooling to 230 ° f [110 ° C], the furnace is discharged.

CA6NM heat treatment is closely related to the composition of CA6NM, which affects the application range and mode of CA6NM materials. 

The following table shows the properties and specifications of CA6NM alloy

Cast Details

ACI / CAST CAST ASTM CAST EN / DIN CAST UNS WROUGHT UNS WROGRHT
CA6NM A352,A487,A743,A757 1.4313 GX5CrNi134 J91540 S41500 13-4,F6NM

CA6NM chemical composition

chemical composition(wt%)
CChromiumNiMoOtherPREN
<0.0612.53.70.6 

Casting minimum mechanical properties

Casting minimum mechanical properties (at 20°C)
Rp0.2 [MPa]Rm [MPa]A %CA6NM Hardness [HB]impact [J]
55075515230-30070

Physical Properties

Physical properties (at 20°C)
microscopicρ[kg / dm 3 ]α[μm/ m∙K](20 – 100°C)K [W / m∙K]Cp [J / kg∙K]meltΔT[°C]
Martensite, (δ ferrite)7.6510.522.64501399-1467

Welding performance: good

Of course, CA6NM heat treatment material is only a way to change the chemical composition/hardness/density and other properties; in order to avoid material, we will also consider the market specification and price of this alloy. Click to contact us

Application of alloys in CA6NM martensitic stainless steel

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