... year warranty. Machinery main components: open book machine (uncoiler),→ forming welding machine,→ grinding machine, →sizing machine,→ frame straightening, →cutting machine,→ finished frame. ... are:201,202;304'304L,310S,316,316L.321,347H,etc As the mature technology of ... chemical, pharmaceutical, brewery, oil, food, automotibe, paper and air conditioning industry. Automatic SS Pipe Making Machine