1. The main characteristic of cold-drawn seamless steel pipe is that it has no welding seam and can withstand large pressure. Products can be very rough as-cast or cold-dialed parts. 2. Precision steel pipe is a product appearing in recent years. It mainly has strict tolerance and roughness for inner hole and outer wall dimensions. The characteristics of cold-drawn steel pipe: 1) smaller outer diameter. 2. High precision can be used for small batch production. 3. Cold-drawn products have high precision and good surface quality. 4. The transverse area of steel tube is more complex. 5. Steel pipe has better performance and denser metal. 热轧精密钢管后的区别
Differentiation of 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。
Hot-rolled precision steel tube is made of continuous casting round tube slab or blooming slab, heated by walking-beam heating furnace, descaling by high pressure water and entering rough rolling mill. Rough rolling material is cut, tailed and re-entered into finishing mill. Computer controlled rolling is implemented. After finishing rolling, it is cooled by laminar flow and coiled by coiler and becomes direct hair coil. The head and tail of straight hair curls are usually tongue-like and fish-tail-like, and the accuracy of thickness and width is poor. The edges of straight hair curls are often corrugated, folded and tower-shaped. The coil weight is heavy and the inner diameter of the coil is 760 mm. After the straight hair coil is treated by cutting head, cutting tail, trimming edge, multi-pass straightening and leveling, and then cut or re-coil, it becomes hot rolled steel plate, flat hot rolled steel coil, longitudinal cut strip and other products. Hot-rolled finish coil will be hot-rolled pickled coil if the oxide scale is removed by pickling and oiled.
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