Because Cold-rolled generally used steel coil has not been annealed, its hardness is very high (HRB is greater than 90), and its machinability is extremely poor, so Cold-rolled generally used steel coil can only perform simple directional bending less than 90 degrees (perpendicular to the coiling direction).
To put Cold-rolled generally used steel coil simply, cold rolling is processed and rolled on the basis of hot rolled coils. Generally speaking, it is a process of hot rolling—pickling—cold rolling.
Grade | Yield Strength | tensile strength | Elongation |
SPCC | ≤240 | ≥270 | ≥28 |
Cold-rolled is processed from hot-rolled sheets at room temperature. Although the temperature of the steel sheet will be heated during the processing, Cold-rolled generally used steel coil is still called cold-rolled. Due to the continuous cold deformation of hot rolling, the mechanical properties are relatively poor and the hardness is too high. It must be annealed to restore its mechanical properties, and those without annealing are called hard rolled coils. Hard-rolled coils are generally used to make products that do not require bending or stretching, and those with a thickness of less than 1.0 are rolled on both sides or four sides with good luck.
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