Stainless steel pipe/tube: Goods name : seamless Standard: astm a213, a269, a270, a312, a511, a632, a789, a790 Steel grade: tp304, tp304l /h, tp310s, tp316, tp316l/ h, tp321, tp317, tp317l, s31803 Diameter (mm): 1.6~630 Thickness (mm): 0.2~30 Goods name : welded Standard: astm a249, a269, a270, a312, a554, a632, a789, a790 Steel grade: tp201, tp202, tp304, tp304l, tp304h, tp316, tp316l, tp316l/h, tp321, tp409, tp409l Diameter (mm): 13~1000 Thickness (mm): 0.9~20