Design code for structural steel materials

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asya04
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Bidders propeses ASTM A36 material istead of S275 J2 or S355ML/NL for structural steel (Piperack, Equipment Structure, etc.) on the basis of international standards for most optimal and economical design. Is it really optimal? pls explain why
 
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ACI, AISC, ASCE and ASTM will apply to Civil and Structral. So pls help which of one is optimal and economical ASTM A36 or S275 J2 or S355ML/NL? Thank u
 
From what I know, A36 is the lowest quality among those if we compare the yield strengths, which is the most important metric in most cases. It is probably the cheapest, though I don't know the steel prices. You can refer to this:

http://ds.arcelormittal.com/repo/Projects%20Oil%20and%20Gas/Material%20Grade%20Comparison%20Chart.pdf

Which is best? That depends on the application.