Material characteristic of Fittings (Elbows, Reducers, Tees) 1

ASTM A234 WPB yield stress is 32 ksi
ASTM A234 WPC yield stress is 40 ksi
WPHY is an MSS SP-75 designation for higher yield strength fittings 42 = 42 ksi, 60 = 60 ksi, etc.

Because of the different yield strengths associated with each one, none could be considered equal.

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"The problem isn't finding the solution, its trying to get to the real question." BigInch

Thanks BigInch,

My understanding is that the A234 WPB has a minimum yield of 32ksi as you stated. However I have material test reports showing this A234 WPB with yields from 43100 - 49400 ksi (They exceed the minimum yield). This would fall within the parameters of the MSS SP-75 WPHY 42 for yield. Other than yield which this WPB material meets, are there any other differences that I should consider or should know about if we decide to substitute this material?

I have attached the material test report for the A234 WPB which shows the yields.

Yield strengths vary from batch to batch and it is quite possible that the fitting has yields higher than that required, BUT SP-75 still has many other requirements that 234 WBP dosn't address; too many to address here. ASTM A234 is basically one material specification for low strength fittings. SP-75 concerns high strength fittings. Its not only about yield stress. You really need to read both specs. don't you think.

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"The problem isn't finding the solution, its trying to get to the real question." BigInch

Yes you are absolutely right I should read both specs, but I am having trouble finding them, thats why I came here. Thanks a bunch for you input, you have been really helpful.

Don't substitute anything until you get those specs, then you'll know why you can't.

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"The problem isn't finding the solution, its trying to get to the real question." BigInch