SKF 388K steel 1

[harsuda]

Hi All,

What are the other equivalent standards for 388K? Is this material forgeable?

Recently I forged this steel and ended up with cracks in some of the parts.

I would appreciate if any of you can help.

 

[harsuda]

Hi All,

Plese see the chemical composition of this material fiven below.

C: 0.45-.50
Mn:0.6-0.9
Si: 0.15-0.30
Cr: 0.90-1.20
Ni: 0.40-0.70
Mo: 0.90-1.10
V: 0.10-0.15
S:0.025 max
P: 0.025 max

 

[Flesh]

Yes, its forgeable at 2000-2250F. Although I have not personally forged this material, the handbooks suggest furnace cooling this material after hot working:
Soak thru at 1200-1300F, furnace cool to 1000F, then air cool.

 

[dbooker630]

Try AMS 6431.

 

[metengr]

The SKF 388 steel looks to be similar to the Ladish D-6A alloy, which is listed by ASM Metals Handbook, Volume 1 as a medium carbon, ultra-high strength steel. The nominal chemical composition is listed below;

C 0.42-0.48%
Mn 0.6-0.90
Si 0.15-0.30
Cr 0.9-1.20
Ni 0.4-0.7
Mo 0.9-1.10
V 0.05-.10

If you have access to ASM Handbook, Vol 1 it contains an excellent write-up on this material, including recommended forging temperatures. It is recommended to heat this material to 2250 deg F max, and finish forging at or above 1800 deg F. Slow cool in a furnace or insulating medium.