Exposed to fluid pressure steel pipe should be carried out hydraulic pressure test to test the capacity and quality of pressure, leakage does not occur in the required pressure, wet or expansion of qualified, some steel pipe but also according to the standards or demand side requirements curling trials , flaring test, flattening test. Seamless stainless steel pipe stainless steel seamless pipe, tube or solid steel ingot made of perforated capillary, and then hot-rolled, cold-rolled or cold call is made. Seamless steel pipe with diameter * thickness of a few millimeters. Full name of 304 stainless steel pipe SUS304 stainless steel pipe