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amarv12 (Mechanical)
8 Oct 08 0:39
Hello,

I find myself being faced with the obstacle of hunting down allowable stress values for a stress analysis job that I am working on for a client.

I am working with some main steam lines that were designed and constructed in the late 40's.  The materieal was specified as ASTM A315.  I have been able to find out that in 1952 the material was withdrawn and replaced by A335 P12, but I am still hoping to find the original allowables.  

I was wondering if anyone had such figures available?

Possibly code values from around 1950?

Thanks in advance!
JohnBreen (Mechanical)
10 Oct 08 15:40
Amarv12,

SA 315 is listed in the 1952 edition of ASME Section II as a Specification for Seamless 1 percent Chromium, 0.5 percent Molybdenum Alloy-steel pipe for service at high temperatures.

Tensile strength is given in the 1952 edition of ASME Section II as 60,000 psi and the yield strength is given as 25,000 psi.  You could use 2/3 yield or 1/3 ultimate tensile as an allowable below the creep range.  Data for creep range is not supplied in Section II.

ASTM A-335, P12 is also 1 percent Chromium, 0.5 percent Molybdenum alloy-steel but although the tensile strength is also given (in B31.3, Appendix A) as 60,000 psi the yield strength is given as 32,000 psi.  So you might want to be a little conservative in the allowable stress limits you use when you compare the old material to the new material.

Regards, John

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