Cold rolled steel and hot rolled steel difference is not in the smelting process, but is that the temperature of steel rolling, or termination of the temperature of steel rolling.Finishing temperature below recrystallization temperature becomes cold rolling steel.Hot rolled steel easy rolling, rolling of high efficiency, but under the condition of hot rolled steel oxidation, product surface is dark grey light.Requirements of steel rolling mills big power, low efficiency of rolling, in order to eliminate the strain hardening in the process of rolling and even in the middle of annealing, so costs are high, but is cold rolled steel surface brightness, good quality and can be directly used for processing the finished product, says cold rolled steel sheet application is very extensive.
With hot rolled steel coils as raw material, after acid pickling to remove oxide skin for cold rolling, the finished product is hard, because of cold work hardening caused by deformation of continuous cold rolling hard roll strength, increase hardness, toughness and plastic index decreased, so the stamping performance will deteriorate, only can be used for simple deformation of the parts.Hard coil can be used as a raw material, hot dip galvanized factory for hot dip galvanizing unit Settings are annealed wire.Hard coil weight generally in June to 13.5 tons, steel at room temperature, for continuous rolling of hot rolled pickling volumes.Inner diameter is 610 mm.
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