1. The main feature of
seamless steel pipe is that it has no welded joint and can withstand large pressure. The product can be a very rough cast or cold-draw.
2. Precision steel pipes are products that have appeared in recent years, mainly due to strict tolerances and roughness of inner and outer wall sizes.
Cold drawn precision steel pipe features
1. The outer diameter is smaller.
2. High precision for small batch production
3. The cold drawn product has high precision and good surface quality.
4. The cross-sectional area of steel pipes is more complicated.
5. The performance of steel pipe is superior and the metal is dense.
Hot rolled precision steel pipe
Hot-rolled precision steel pipe is used as raw material for continuous casting round billet slab or initial rolled slab, heated by step heating furnace, descaled by high pressure water and then into rough rolling mill. The rough rolling material passes through the cutting head and tail and then enters the finishing mill. The computer controlled rolling is carried out, and after the final rolling, it is subjected to laminar cooling and coiling machine to take up and become a straight hair roll. The head and tail of the straight hair roll tend to be tongue-shaped and fish-tail-shaped, and the thickness and width are inferior. The edges often have defects such as waves, folds, and towers. The weight of the coil is heavier and the inner diameter of the coil is 760 mm. After straightening the straight hair through the cutting, cutting, trimming and multi-pass straightening, leveling and other finishing lines, and then cutting or rewinding, it becomes: hot-rolled steel sheet, flat hot-rolled steel coil, vertical Cut the belt and other products. The hot-rolled finishing rolls are acid-washed to remove oxide scale and hot-rolled acid-washed coils.
