The difference between precision pipe and seamless pipe

　　The feature of ASME SA53 Seamless Steel Pipe is no welding seam, it can bear big pressure, the product can be rough as-cast condition or cold drawn piece

　　Precision pipe is a new product in recent years, the main feature is inner bore, ektexine size have strict tolerance and roughness.

　　The feature Cold-drawing precision pipe :

　　1 Much less external diameter.

　　2 High degree of precision can still make small amount product.

　　3 Cold-drawing finished product has high purity, the surface has high quality.

　　4 The pipe’s transverse area is complicated.

　　5 This pipe’s nature is more excellent, the metal’s proportion is high .

　　hot rolling precision pipe

　　Hot rolling precision pipe uses circular tube work-board or first rolling work-board as raw material.

　　After marching type heating stove heating, high pressure water remove phosphorus and enter into cogging mill, cogging mill through the head, the tail and enter into finishing mill , carry out automatic control roll, after rolling it through laminar cooling and recoiling machine’s operate, it become straight hair volume, Straight hair volume ‘s head and the tail always be tongue shape and fish tail’s shape, the thickness and the breadth’s precision is bad. The edge’s disadvantage is the wave’s shape, edgefold and the tower model. This coil is heavy , strip coil’s inner radius is 760mm.the straight hair volume through cut the top, cut the tail, straight many times and smooth ,then cut the plate and recoiling, it became the hot rolled steel plate, smooth hot rolled strip coil, rip cutting products. If the hot roll precise coil washed by acid, the oxide skin will be removed and then we paint the oil , finally it will become hot rolled pickling roll.