Originally Posted by
Mike Mills
Stainless steels have lower yield strengths than carbon steel (by about 1/2).
I make this observation after scanning a handbook with material properties. Of course, any comparison of properties requires specificity of which steels are being compared. That, I do not have right now.
Mike, you're right (of course) that direct comparisons are difficult not only because of the chemical composition of the materials, but also heat treatment if any, cross-section of sample tested, etc.
The material used for Reynolds 953 is Carpenter Custom 455®, and in coming up with the following Yield Strength values I used the Carpenter Custom 455® data sheet, AISI/SAE 4130 chromium-molybdenum steel alloy data sheet, and AISI/SAE 2010 carbon steel data sheet. All figures are for samples in the annealed condition at room temperature, and MPa was converted to psi for as close to an apples to apples comparison as I could get with numbers from the data sheets. A plastic strain of 0.2% is used in all three samples to define the offset yield stress (0.2% Proof).
Carpenter Custom 455® . . . . 0.2% Yield = 115,015 psi
AISI/SAE 4130 chromoly . . . . 0.2% Yield = 52,300 psi
AISI/SAE 1020 carbon steel . . 0.2% Yield =50,800 psi
953 has more than twice the yield strength of either 4130 chromoly or 1020 carbon steel.
What reference did you use that showed stainless steels having lower yield strengths than carbon steel?