What is the difference between HRC and CRC steel sheet?

Answer 1

What is the difference between HRC and CRC steel sheet?

Cold rolling is a metallurgical process in which metal is passed through a pair of rollers at a temperature below its recrystallization temperature. This process hardens the metal, by compressing and stretching the metal crystals. During the rolling process, the metal is annealed by heating it above the recrystallization temperature after every few rollings, to prevent it from becoming brittle and cracking.

Cold rolled metal is given a "temper" rating based on the degree it was compressed. "Skin-rolled" metal undergoes the least rolling, being compresssed only 0.5-1% to harden the surface of the metal and make it more easily workable for later processes. Higher ratings are "quarter hard," "half hard" and "full hard"; in the last of these, the metal is compressed by 50%. Metal hardened by cold rolling can bend without breaking, although ductility decreases as the hardness increases. Quarter hard metal can be bent entirely back on itself, while full hard can only be bent 45°.

Most non-ferrous metals are rolled cold to make sheet. Steel is usually rolled hot, except when thin sheet or special bars such as machine shafts are being produce

The metallurgical process of Hot rolling, used mainly to produce sheet metal or simple cross sections from billets describes the method of when industrial metal is passed or deformed between a set of work rolls and the temperature of the metal is generally above its recrystallization temperature, as opposed to cold rolling, which takes place below this temperature. This permits large deformations of the metal to be achieved with a low number of rolling cycles.

Because the metal is worked before crystal structures have formed, this process does not itself affect its microstructural properties. Hot rolling is primarily concerned with manipulating material shape and geometry rather than mechanical properties. This is achieved by heating a component or material to its upper critical temperature and then applying controlled load which forms the material to a desired specification or size.

Mechanical properties of the material in its final as-rolled form is a function of: the material chemistry, reheat temperature, rate of temperature decrease during deformation, rate of deformation, heat of deformation, total reduction, recovery time, recrystallisation time, and subsequent rate of cooling after deformation