Stainless steel is less contains fifty seven 50% iron and 10.5% chromium, and also to join such as nickel, titanium, molybdenum, according to different containing suspension components, the metal internal microstructure is different also, it is markov shape, iron grain size, austenite, duplex, precipitation hardening stainless steel, etc.Health level of seamless stainless steel pipe has a different material. General industrial tube austenite size stainless steel material is more commonly used;00 0 cr19ni9 (USU304), cr19ni11 (USU 304 l), 0 cr17ni12mo2 (USU) 316, 00 cr17ni14mo2 (USU 316 l), 1 cr18ni9ti (SUS 321), etc.In accordance with GB/T14976-94 the standard of the journal fluid conveying stainless steel seamless steel tube, and the requirement of steel pipe inside and outside surface finish. Health level of choose and buy seamless stainless steel pipe and fluid type, concentration, temperature, pressure, flow rate, and other factors.