1.The main feature of Seamless Steel Tube is that there is no welding joint,and it can withstand large pressure.The products can be very rough as cast or cold drawn parts.
2.Precision steel pipe is a product emerging in recent years,mainly because the inner hole and outer wall dimensions have strict tolerance and roughness.
Features of cold drawn precision steel pipe:
1).Smaller outside diameter.
2)High precision can be produced in small batches.
3)Cold drawn products have high precision and good surface quality.
4)The cross area of steel pipe is more complex.
5)The steel pipe has better performance and the metal is relatively dense.
Differences after hot-rolled precision steel tubes
Hot rolled precision steel tubes are made of continuous casting round tube blank slab or blooming slab as raw materials,which are heated by a walking beam furnace,descaled by high-pressure water,and then sent to the roughing mill.The roughing material is cut into the head,tail,and then sent to the finishing mill for computer controlled rolling.After the final rolling,it is cooled by laminar flow and coiled by a coiler to become a straight coil.The head and tail of straight hair curls are often tongue shaped and fishtail shaped,with poor thickness and width accuracy,and the edges are often wavy,folded,tower shaped and other defects.The coil is heavy and the inner diameter of the steel coil is 760mm.The straight hair coils are cut or recoiled after finishing lines such as head cutting,tail cutting,edge cutting,and multi pass straightening and leveling,which become hot rolled steel plates,flat hot rolled steel coils,longitudinal cut strips and other products.Hot rolled finished coils can be hot rolled pickled coils after pickling to remove oxide scale and coating oil.
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