Difference between precision steel pipe and seamless steel pipe

2、精密钢管是近几年出现的产品，主要是内孔、外壁尺寸有严格的公差及粗糙度。

2, precision steel pipe is a product of recent years, mainly the inner hole, outer wall size, strict tolerances and roughness.

冷拔精密钢管的特点：1).外径更小。2).精度高可做小批量生。3).冷拔成品精度高，表面质量好。4).钢管横面积更复杂。5).钢管性能更优越，金属比较密。

Cold drawn precision steel pipe features: 1) less outer diameter. 2) high accuracy, small batch production. 3) cold finished products have high accuracy and good surface quality. 4) the transverse area of steel pipe is more complicated. 5) steel pipe performance is superior, metal more closely.

热轧精密钢管后的区别

The difference between hot rolled precision steel pipe

热轧精密钢管用连铸圆管坯板坯或初轧板坯作原料，经步进式加热炉加热，高压水除鳞后进入粗轧机，粗轧料经切头、尾、再进入精轧机，实施计算机 控制轧制，终轧后即经过层流冷却和卷取机卷取、成为直发卷。直发卷的头、尾往往呈舌状及鱼尾状，厚度、 宽度精度较差，边部常存在浪形、折边、塔形等缺陷。其卷重较重、钢卷内径为760mm。将直发卷经切头、 切尾、切边及多道次的矫直、平整等精整线处理后，再切板或重卷，即成为：热轧钢板、平整热轧钢卷、纵切带等产品。热轧精整卷若经酸洗去除氧化皮并涂油后即 成热轧酸洗板卷。

With the continuous casting round billet slab or steel tubeshot rolledprecision steel as raw material, after reheating furnace heating, descaling into the roughing mill of high pressure water, roughing material by cutting head, tail, and then enter the finishing mill, the implementation of the computer controlled rolling and after rolling through the laminar cooling and coiling machine, coiling become straight hair volume. Hair straightenerrollhead, tail tongue shapeand thefishtail shape, thickness, width of poor accuracy, edgehaswavy, folding, tower and other defects. The coil weight is heavy, and the inner diameter of the steel coil is 760mm. Thestraightthroughcutting head cutting, cutting tail, cutting edge and multi pass straightening and leveling finishing line processing, cutting board or heavy volume, which becomes: hot rolled steel plate and flat steel coils, slittingstripand other products. Hot finishing rolling by pickling descaling and oil is made by pickling hot-rolled coils.