GB/T4237 Standard specifies the Stainless steel hot rolled steel sheet and strip classification, code, order content, dimension, shape, weight and allowable deviation, technical requirements, test etc.GB/T4237 Standard Austenitic and ferritic stainless steel main steel grade:022Cr25Ni7Mo4N,03Cr25Ni6Mo3Cu2N,022Cr23Ni5Mo3N and so on.