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The Concept Of Cold-rolled And Hot-rolled
Jan 07, 2017

1. hot rolled
Slab in continuous casting slabs or blooms as raw materials, after walking-beam heating furnace heating, high pressure water descaling into rough mill, roughing the head, tail, and then into the finisher, computer controlled rolling, rolling through after cooling (computer-controlled cooling rate) coiling and coiling machine, straight hair volume. Straight hair a tongue-shaped head, tail and tail-like, thickness, width, poor accuracy, edge Ribbon, fold, pyramid and other defects. The volume weight is heavier, steel inner diameter is 760mm. (General pipe industry likes to use. ) Straight hair by the head, tail, edge cutting and straightening and flattening of multi-pass after finishing line, cutting board or heavy volumes, it becomes: flat hot-rolled steel plate, hot rolled coil, slit strip products. If descaling by pickling finishing roll of hot rolling and greased after a hot-rolled pickling sheet.
2. cold rolled
Rolled in hot-rolled steel as raw materials, after descaling by pickling tandem cold rolling, its finished product rolling hard rolls, peening due to continuous cold rolling hard volume strength plastic index, increase hardness, toughness, stamping performance can only be used for simple deformations of parts. Rolling hard rolls can be used as raw material for hot dip galvanizing plant, set for hot galvanizing annealing line. Rolling hard rolls weighing 6~13.5 tons, coil diameter is 610mm. Cold rolling Board, volume should be subject to continuous annealing (CAPL units) or Bell-type furnace for annealing to eliminate stress peening and rolling, meet the mechanical properties of standard indicators. Cold-rolled steel sheet surface quality, appearance, accuracy is better than hot-rolled plate.