13Cr and F6NM Cast or forged 1

[subtechy]

Can anybody halp me with regard to the manufacturing process of the above 2 materials 13Cr(S42000) and F6NM(ASTM 182/ UNS S42400) .

I understand that the 2 materials are similar although F6NM has the addition of Nickel and Molybdenum.

Are these materials cast or forged or can they be both dependant on size of billets required?

Kindest regards

ST

 

[stanweld]

Both alloy grades 6NM and 420 can be wrought or cast. I'm not sure what you are really asking.

 

[TVP]

ASTM A 182 specifies forged or rolled alloy or stainless steel flanges, etc.

http://www.astm.org/Standards/A182.htm

 

[stanweld]

The casting grade designations are CA6NM and CA40.

 

[redpicker]

I always thought that 13Cr (420) was difficult to cast because of cracking and that CA6NM was developed to reduce the cracking tendencies (these materials being used mainly in valve applications). It was then discovered that the CA6NM material possesed superior corrosion resistance than the 420 material. The forged counterpart to CA6NM, F6NM, was developed because applications using the CA6NM materials wanted higher pressures than the castings could be rated.

But, to answer the original question, yes, these materials can be either cast of forged, although the material specification (and nomenclature) is usually specific to the manufacturing method. That is, F6NM and CA6NM are essentially the same material, but one is forged and the other is cast. They might have slightly different chemical composition ranges due to the different manufacturing methods, but they are basically the same.

rp