Cold rolling is usually carried out on a two-high mill, in which steel pipes are rolled in a ring pass consisting of a variable circular groove and a stationary conical head. Cold drawing is usually carried out on a single or double chain cold drawing machine of 0.5 ~ 100T.
High-quality carbon structural steel cold-drawn seamless pipe, mainly made of No. 10, No. 20, No. 35, No. 45 steel, in addition to ensure chemical composition and mechanical properties to do hydraulic test, flange, flaring, flattening and other tests.
The difference between cold-drawn precision steel pipe and ordinary seamless steel pipe:
1, the main feature of the general ordinary seamless steel pipe is that there is no welding joint, which can withstand greater pressure. The product can be very rough cast or cold drawn parts.
2, cold-drawn precision steel pipe is a product in recent years, mainly the inner hole, the outer wall size has strict tolerances and roughness.
Characteristics of cold-drawn (rolled) precision steel pipe:
1. Smaller outside diameter.
2. High precision can be done in small batches
3. Cold drawing (rolling) finished products with high precision and good surface quality.
4. The transverse area of the steel pipe is more complicated.
5. Steel pipe performance is better, the metal is compared to dense.
