保定市冷拔无缝钢管厂

The main difference between hot rolling and cold rolling is:

1、冷轧成型钢允许截面出现局部屈曲，从而可以充分利用杆件屈曲后的承载力；而热轧型钢不允许截面发生局部屈曲。

1, the local section of the permitted section of cold-rolled steel is local buckling, which can make full use of the post buckling bearing capacity of the rod, while the hot rolled section steel does not allow local buckling of the section.

2、热轧型钢和冷轧型钢残余应力产生的原因不同，所以截面上的分布也有很大差异。冷弯薄壁型钢截面上的残余应力分布是弯曲型的，而热扎型钢或焊接型钢截面上残余应力分布是薄膜型。

2. The cause of the residual stress of hot rolled and cold rolled steel is different, so the distribution of the cross section is very different. The residual cold-formed steel section stress distribution is curved, and hot rolled steel or steel welding section on the residual stress distribution is thin.

两种钢管在成品上没有多大的区别,一般都是按标准制造的.机械性能都没什么样区别

There is not much difference between the two kinds of steel tubes in finished products. They are generally made according to standard. There is no difference in mechanical properties.

存在的多数是加工工艺不同,以及最后出来的精度不同,一般来讲冷拔尺寸精度及表面光洁度较高.

Most of the existing processing technology is different, and the final accuracy is different, generally speaking, the cold drawing precision and the surface finish are high.

热轧工艺:管坯---加热---穿孔---轧管---定径---冷床---矫直---切管---检验---打包---发货

Hot rolling tube - heating - - perforated tube rolling - sizing - bed - straightening - - - - pipe cutting test package delivery

冷拔工艺:管坯---加热---穿孔----热轧(二穿)等---打头--酸洗--磷化--冷拔--退火(可以多道次重复打头至后工序)---矫直----切管---检验---打包---发货

Cold drawing process: tube billet -- Heating -- piercing -- hot rolling (Er Chuan) and so on -- start up -- acid pickling -- phosphating -- cold drawing annealing, which can be repeated multiple times to the later process -- straightening, cutting and checking -- packing -- shipment.

钢管作为钢铁产品的重要组成部分，因其制造工艺及所用管坯形状不同而分为无缝钢管（圆坯）和焊接钢管（板，带坯）两大类。

As an important part of iron and steel products, the steel pipe is divided into two main categories: seamless steel tube (round billet) and welded steel pipe (slab and billet) because of its manufacturing process and the shape of tube blank.

（1）无缝钢管

(1) seamless steel pipe

因其制造工艺不同，又分为热轧（挤压）无缝钢管和冷拔（轧）无缝钢管两种。冷拔（轧）管又分为圆形管和异形管两种。

Because of its different manufacturing process, it is divided into two kinds of hot rolling (extrusion) seamless steel pipe and cold drawn (rolling) seamless steel pipe. The cold drawing (rolling) tube is divided into two kinds of circular tube and special tube.

a．工艺流程概述

Overview of A. process flow

热轧（挤压无缝钢管）：圆管坯→加热→穿孔→三辊斜轧、连轧或挤压→脱管→定径（或减径）→冷却→坯管→矫直→水压试验（或探伤）→标记→入库。

Hot rolled (extruded seamless steel pipe): round tube billet, heating, piercing, three roll skew rolling, continuous rolling or extrusion, pipe stripping, diameter setting or reducing, cooling to blank tube to straightening, water pressure test (or flaw detection), marking to storage.

冷拔（轧）无缝钢管：圆圆管坯→加热→穿孔→打头→退火→酸洗→涂油（镀铜）→多道次冷拔（冷轧）→坯管→热处理→矫直→水压试验（探伤）→标记→入库。

Cold drawn (rolled) seamless steel tube: round tube billet, heating, piercing, heading to annealing, acid pickling, oiling (copper plating), multi pass cold drawing (Leng Zha), tube to heat treatment, straightening, water pressure test, marking to storage.