The development trend of seamless steel pipe

　　Seamless steel pipe means outside diameter more than 100MM and the wall thickness is greater 0.2 than the outer diameter of the pipe, seamless steel pipe is made from solid pipe ingot or the perforation capillary, then through hot rolling and cold rolling or cold dial.

　　At present China's seamless steel pipe, the main production process is hot-rolled and heat expansion of seamless steel pipe, API 5L ASTM A53 Seamless Steel Pipe specifications for 325mm-1220mm maximum thickest of 120mm, can produce seamless steel pipe thermal expansion Non-national standard dimensions, thermal expansion seamless is what we often say that thermal expansion, density is relatively low but strong contraction rolled steel with oblique method or drawing method to expand a shortage of pipe diameter pipe finishing processes. In a short period of time for the steel thickening to produce non-standard and special types of seamless pipe, and low cost, high production efficiency, the development trend of international rolling fields today.