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Welding Different Grades of Steel in API 650

Welding Different Grades of Steel in API 650

Welding Different Grades of Steel in API 650

(OP)
What are the rules and/or guidelines in API 650 of the shell plate of a storage tank having different grades of steel? Is there anywhere where it explicitly allows or does not allow this? We want to use a slightly higher grade on the lower courses and then a higher grade steel towards the top of the tank and cannot find any guidelines in the standard.

Thanks in advance

RE: Welding Different Grades of Steel in API 650

5.6.1.3 of API 650 specifically allows different shell courses to have different allowable stresses (i.e. different material grades).

RE: Welding Different Grades of Steel in API 650

It is very common to use higher strength material for the lower courses. If by grades you mean the API groups then it would be somewhat unusual to have a higher group number steel above a lower group number steel but there is no provision against it.

RE: Welding Different Grades of Steel in API 650

(OP)
Thank you very much, I have now seen it.

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