Tensile test

[gluca]

Good morning,
I have a question which can regard both ASTM/ASME forum and Materials forum. We produce seamless carbon steel fittings according to ASTM/ASME A/SA420 WPL6, suitable for low temperature service up to -50 deg. °F.
Our starting pipe is according to ASTM/ASME A/SA333 gr. 6: our supplier delivers the pipe with a EN10204 3.1 certificates, stating that the pipe has been totally normalized, impact tested at -50 deg. °F and mechanical tested (yield strength, tensile strength and elongation %).
My question is the following: after reading ASTM/ASME A/SA420 para 9.2, it seems to me that we are not compelled to perform new tensile tests, as we normalize the fitting and all the required tests (both tensile and impact) have already been performed by our supplier on the normalized pipe.
Do you think I'm right?

Thanks to all
regards

 

[metengr]

No, I don't believe you are correct. My interpretation of Section 9.2 in the 2006 edition of ASME SA 420 indicates that one tension test shall be performed on each heat of material and in the same heat treatment condition as the finished fittings it represents. So, even if you are re-normalizing, you need to at least conduct one tension test to assure conformance with mechanical properties.

 

[AIAIAANI]

Please don't forget Impact Testing. Read Par 9.3.2 it refers to specimens taken from the fittings. Mauro

 

[EdStainless]

Since you have altered the thermo-mechanical condition of the fitting you will need to test. All that you can use from the original MTR is chemistry.

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