Temperature vs. Yield Strength

The best I could come up with for you is using the cross-reference that 42CD4 is equivalent to AISI/SAE 4140 and then going with ASME Section 2 Part D for SA-574 bolting product.

According to this, the yield strength would be as follows:

Deg. F : Yield (ksi)

-20 to 100 : 135.0
200 : 126.9
300 : 121.7
400 : 117.6
500 : 114.0
600 : 110.4
650 : 108.4
700 : 106.2
750 : 103.7
800 : 100.9
850 : 97.7
900 : 94.1
950 : 90.0
1000 : 85.5

I hope that is of some use to you.

Out of curiosity - are you using this material for bolting, or shafting, or ....?

Presuming 90% martensite?

What temper temperature? I dont have a copy of SA 574...

milo

I posted a copy of A574 here

Great utility Guest. Learned two things with that ne.

milo

As per section 5.5:

The screws shall be heat treated by oil quenching from above the transformation temperature and then tempering at a temperature not lower than 650°F.