Cold rolling is usually carried out at room temperature, which has the additional function of machining hardening and strengthening materials, thus further improving the mechanical properties of materials. It also improves surface finish and allows for tighter tolerances. However, the ductility of normal temperature steel is not as good as that of hot rolled steel. Cold rolled products usually include similar hot rolled products, such as sheet and bar, but are usually smaller.

The manufacturing process of cold rolled steel pipe can be listed as below:

1. Preparing the materials: round bars.

2. Inspection of materials.

3. Peeling.

4. Cut to length.

5. Grinding and inspection.

6. Centering.

7. Heating.

8. Piercing.

9. Pickling.

10. Head cutting/end cutting.

11. Grinding and inspection.

12. Cold rolling or cold drawing.

13. Degrease.

14. Heat treatment.

15. Straightening.

16. Cutting.

17. Picking(the semi-finished product should be back to the grinding and inspection steps to get a perfect finish on the products).

18. Product Inspection.

19. Cutting.

20. Packing storage.