They are usually suitable for the material of seamless steel pipes, which are divided into two commonly used types: GB8162 and GB8163. However, only GB8162 is available for 45 # steel, which is a commonly used steel pipe material for mechanical processing.

The difference between ordinary cold drawn seamless steel pipes and precision rolled seamless steel pipes is

1. The main feature of ordinary seamless steel pipes is that they have no welded joints and can withstand significant pressure. The product can be a very rough cast or cold drawn part, suitable for mechanical processing and fluid pipelines.  

2. Precision steel pipes are products that have emerged in recent years, mainly due to strict tolerances and roughness in the dimensions of the inner and outer walls. They have a bright appearance, but one drawback is that they cannot be bent. The solution is annealing, but after annealing, they will not emit light, but the wall thickness tolerance can still be guaranteed.