material selection
material selection
(OP)
Could someone tell me where I would check if materials are compatible with each other and what the governing factors are ie P No group No chemical make up in ASME VII ? appreciate this is a simple question but your experience and help is appreciated this is a learning process for me .





RE: material selection
You mean ASME VIII? The basis for P numbers (someone will correct me if I'm wrong here, but in general its like) a grouping of materials of the same chemical make and same mechanical characteristics.
What does the P-nr according to you, have to do with the original question?
The answer could be simple if you had better defined your question.
RE: material selection
RE: material selection
Ok for what (purpose)? Corrosion? Mechanical properties, e.g. yield or tensile stresses, thermal conductivity?
RE: material selection
RE: material selection
If you don't have the original design calculations then you will be hard pressed to justify a substitution.
These alloys are different in strength,temperature limits, corrosion resistance, thermal expansion.
If this is a low temperature, mildly stressed, non-corrosive application then the call is easy, otherwise there is design work involved.
P groups just mean that alloys are handled in a similar way for welding, it does not mean that they are interchangeable.
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Plymouth Tube
RE: material selection