FAQ
Difference Between Hot & Cold Rolled Steel
Release time:2021-12-09
Cold rolled and hot rolled is two different types of steel rolling technology.
Hot rolling steel is made of slab as raw material by roughing mill and finishing mill group after heating. To put it simply, a slab of steel is heated and rolled several times, then trimmed and straightened into a steel plate. This is called hot rolling.Hot rolled plate is easy for processing with good extensibility and low hardness.
Cold rolling steel is using hot rolled steel coil as raw material, after removing the oxide scale by pickling cold rolling, the finished product is full hard coil, due to cold hardening caused by continuous cold deformation, the strength and hardness of full hard coil increases, the toughness and plastic index decreases, so the stamping performance will deteriorate. To put it simply, cold rolling steel is processed and rolled out on the basis of hot rolled plate coils. Generally speaking, it is hot rolling - pickling - cold rolling such a process. Cold rolled plate is relatively difficultfor processing with high hardness & strength and is not easy to deform. Generally used for cold bending spring pieces and parts.
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