1. Standard. The executed standard for structure, fluid transport, heat exchanger of boiler and cracking of the petroleum gb/t14975-2002, gb/t14976-2002, gb/t13296-91, gb2270-80, gb9948-88, astm/asme a213, a269, a312, jisg3459, jisg3463, jisg3448 and dini17458. 2.Material: aisi/tp304, 304l, 304h, 321, 316, 316l, 317l, 310s and347h steel steel. 3.Out diameter: 6- 630mm 4.Wt: 0.5-30 mm 5.Length:1000--7000 Standard export packing in bundles or in plywood cases
