... 1017, ASTM 1020, ASTM A36StandardManufactured to meet ISO9001, ASTM, API, SAE, DIN, BSGB and SY requirementsApplicationWidely used in curtain walls, construction ... , seamless pipe, square steel tubes, rectangle steel tubes, spiral steel tubes and stainless steel piping. Meanwhile, it also markets steel sheet, steel flat and other various ...