We recently discovered a supplier had substituted B7 studs in place of the SA36 we ordered. (a no charge "upgrade") Some of these B7 studs got welded to SA516-70 plate as a lifting device (GMAW ER70S-6). I know that ASME does not recognize B7 as a weldable material, but this is not an ASME Code...
We are fabricating ASME Code pressure vessels specified to be 9 chrome. We had used Gr 91 in our calculations and drawings for the plate materials, as it was the only grade of 9cr in our software (Advance Pressure Vessel).
The material we received is grade 9, and it was rejected as...
