... to meet ISO9001, ASTM, API, SAE, DIN, BSGB and SY requirementsApplicationWidely used in curtain walls, construction structure, machinery, ... square steel tubes, rectangle steel tubes, spiral steel tubes and stainless steel piping. Meanwhile, it also markets steel ... (diameter from 300mm to 1000mm)Professional PackingOur Productions Application Anti-rust Black Painting Treatment Suitable for Sea ...