2, precision steel pipe is a product of recent years, mainly the inner hole, outer wall size, strict tolerances and roughness.
Cold drawn precision steel pipe features: 1) less outer diameter. 2) high accuracy, small batch production. 3) cold finished products have high accuracy and good surface quality. 4) the transverse area of steel pipe is more complicated. 5) steel pipe performance is superior, metal more closely.
The difference between hot rolled precision steel pipe
With the continuous casting round billet slab or steel tubeshot rolledprecision steel as raw material, after reheating furnace heating, descaling into the roughing mill of high pressure water, roughing material by cutting head, tail, and then enter the finishing mill, the implementation of the computer controlled rolling and after rolling through the laminar cooling and coiling machine, coiling become straight hair volume. Hair straightenerrollhead, tail tongue shapeand thefishtail shape, thickness, width of poor accuracy, edgehaswavy, folding, tower and other defects. The coil weight is heavy, and the inner diameter of the steel coil is 760mm. Thestraightthroughcutting head cutting, cutting tail, cutting edge and multi pass straightening and leveling finishing line processing, cutting board or heavy volume, which becomes: hot rolled steel plate and flat steel coils, slittingstripand other products. Hot finishing rolling by pickling descaling and oil is made by pickling hot-rolled coils.
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