冷拔钢管的生产方法主要是靠芯棒拔制来改变冷拔钢管的外径及厚度。外观上冷拔无缝钢管要短于热轧无缝钢管，冷拔无缝钢管的壁厚一般比热轧无缝钢管要小，但是表面看起来比厚壁无缝钢管加明亮，表面没有太多的粗糙，口径也没有太多的毛刺。

The production method of cold-drawn precision steel pipe mainly depends on mandrel drawing to change the outer diameter and thickness of cold-drawn steel pipe. The appearance of cold-rolled seamless steel tube is shorter than that of hot-rolled seamless steel tube. The wall thickness of cold-rolled seamless steel tube is generally smaller than that of hot-rolled seamless steel tube, but the surface looks brighter than that of thick-walled seamless steel tube. The surface is not too rough and the caliber is not too much burr.

1、无芯棒拔制（拔制时只用拔管模不用芯棒）。

1. Drawing without mandrel (drawing only with drawing die without mandrel).

2、短芯棒拔制（拔制时用拔管模及轴向固定的长度不大的短芯棒）。

2. Short mandrel drawing (drawing with drawing die and short mandrel with fixed axially length).

3、长芯棒拔制（拔制时用拔管模及随所拔钢管一起移动的长度略大于管子长度的长芯棒）。

3. Drawing of long mandrel (drawing with drawing die and long mandrel whose length is slightly longer than that of the tube when moving with the drawn steel pipe).

4、游动芯棒拔制（拔制时用拔管模及不作轴向固定而能自行稳定地保持在变形区中的短芯棒）。

4. Moving mandrel drawing (drawing with drawing die and short mandrel which can be stably maintained in the deformed zone without axial fixing).

一般的冷拔无缝精密钢管的生产工艺可以分为冷拔与热轧两种，冷轧无缝钢管的生产流程一般要比热轧要复杂，管坯首先要进行三辊连轧，挤压后要进行定径测试，如果表面没有响应裂纹后圆管要经过割机进行切割，切割成长度约一米的坯料。

The general production process of cold-drawn seamless precise steel tube can be divided into two kinds: cold-drawn and hot-rolled. The production process of cold-rolled seamless steel tube is generally more complicated than hot-rolled. First of all, the billet must be rolled three rolls continuously. After extrusion, the calibration test should be carried out. If the surface does not respond to cracks, the circular tube must be cut by cutting machine and grow. Billet with a degree of about one metre.

然后进入退火流程，退火要用酸性液体进行酸洗，酸洗时要注意表面是否有大量的起泡产生，如果有大量的起泡产生说明钢管的质量达不到相应的标准。

Then enter the annealing process, annealing to acid liquid pickling, pickling should pay attention to whether there is a large number of bubbles on the surface, if there is a large number of bubbles, indicating that the quality of steel pipes can not meet the corresponding standards.