Features:1) Our main steel grade: TP 304, 304L, 321, 316, 316L, 316Ti, 301, 317, 317L, 430, 329 2) Standards: GB/T14975-2002, GB/T14976-2002, GB13296-91, GB9948-88, ASTMA213, ASTMA312M, DIN 17440, DIN 17224, DIN 17458, JIS G3463, JIS3448 3) Product specifications: a) OD: 4 - 508mm b) WT: 1.5 - 80mm producing area:China