Stainless steel seamless pipe is a kind of hollow section with no seams around. The thicker the thickness of the product, it is more economical and practical, the thinner the wall thickness, its processing costs will rise significantly; the product of its limited performance of the decision, the general low precision seamless steel pipe : Wall thickness is not uniform, the tube surface brightness is low, the cost of high-length, and the appearance of pitting, black spots are not easy to remove; its detection and shaping must be off-line processing. So it in the high-pressure, high strength, mechanical structure of timber reflects its superiority.