... bar, also known as stainless steel circular seamless tubes, intended for the manufacture of engineering components by machining ... Stainless hollow bars are distinguished from seamless fluid-carrying tubes or hollow sections by their dimensions and metallurgical properties ... 17-4PH, 17-7PH,F51, F55, 253MA, 254SMO, Alloy C276, N08367, N08926, Monel400, Inconel625, Inconel718Standard GB/T14975-2002,GB ...