... 1.ISO 9001 2.ASTM A653, JIS G3302 SGCC/SGCH, GB/T 2518... 3.SS grade 33-80; SGCC, SGCH... 4.Z40 ... :2008 ISO9001:2008 STANDARD ASTM A653, JIS G3302 SGCC/SGCH ,GB/T 2518, European standard ASTM A792, JIS G3321 JIS G3317 JIS ... G3312 GB/T 1275…… GRADE SS grade 33-80; SGCC, SGCH, SGCD1-SGCD3 ...