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  3. 主頁 > English > News Center >
    News Center
    Difference between cold rolling and hot rolling
    cold rolling
    Cold: the recrystallization temperature of cold rolling is called the following general, hot rolled steel coil as raw material, after acid wash
    Descaling after cold rolling, the finished rolling hard volumes, due to continuous deformation caused by cold hardening the hard roll
    The strength and hardness of the rise and decline of toughness index, so stamping performance will deteriorate, can only be used for simple deformation of zero
    A. Rolling hard volumes can be used as a hot galvanizing plant raw material, because the hot dip galvanizing line are provided with annealing line. Hard roll heavy general
    In 20-40 tons, at room temperature of hot rolled steel coil, pickling volumes of continuous rolling. The diameter is 610mm.

    Product features: without annealing treatment, the hardness is very high (greater than 90 HRB), the mechanical performance is poor,
    Only a simple bending process is less than 90 degrees direction (perpendicular to the direction of the volume).

    A simple, cold rolling, rolling processing is based on hot rolled on, generally speaking is hot -
    -- -- -- cold pickling phosphating saponification this process.

    Cold is at room temperature by hot plate processing and become, although in the process because the rolling will make heating plate,
    Still, cold call. Because of hot and cold rolled after cold deformation to the mechanical performance is poor, hard
    The degree is too high. Must be to restore the mechanical properties after annealing, no hard roll called annealing. Hard roll is generally used to
    Do without bending, tensile products, 1 thickness of hard luck on both sides of the quadrilateral or bending.

    Amendment: cold usually after annealing treatment.

    In the cold rolling process of cold rolling oil must be used, the use of cold rolling oil is good:

    1, effectively reduce the friction coefficient, and provide the corresponding rolling force, rolling energy consumption low, obtain satisfactory rolling parameters;

    2, the high surface brightness, rolling thickness;

    3, good cooling effect, can quickly take away the hot rolling and rolling roll, protection. The annealing performance is good, does not produce oil burning phenomenon;

    4, there are short-term anti rust performance, can provide the temporary rust protection;

    Hot rolled (hot rolling)
    Hot rolling is compared with cold rolling of cold rolling is the recrystallization temperature of hot rolling below, and is above the recrystallization temperature of rolling
    Advantages: it can destroy the ingot casting, steel grain refinement, microstructure and eliminate defects, so that the mechanical properties of the steel dense.
    Can be improved. This improvement is mainly reflected along the rolling direction, so that steel is no longer a certain extent, isotropic body casting;
    The formation of bubbles, cracks and loose, can also be welded under high temperature and pressure.

    Shortcomings:

    1. after after rolling, steel internal non-metallic inclusions (mainly sulfide and oxide and silicate) were pressed into thin slices, layered
    (sandwich) phenomenon. The performance of layered along the thickness direction of steel tension greatly deteriorated, and may appear torn between the layers in the weld contraction. Weld close
    The local strain induced shrinkage to yield point strain often several times, much larger than the strain due to the load;

    2. uneven residual stress caused by cooling. The residual stress in the external force is no internal stress self balanced, hot rolled steel of various sections of this class
    Residual stress, general steel section size is larger, the greater the residual stress. Although the residual stress is self balanced, but the steel member under external force
    Performance or have a certain influence. Such as the adverse effect on the deformation, stability, anti fatigue, etc. may.

    3. hot rolled steel products, the thickness and width of this control is not good. We are familiar with the expansion and contraction due to the start of the hot rolled out even if the length of time
    Finally, the thickness of the standard, after cooling or negative difference, the negative difference edge width is wider, the thickness of the performance of the more obvious. So on
    In the large steel for steel edge width, thickness, length, angle, and no law requires very precise edges.

    The difference between cold and hot rolling:

    1. The local buckling is allowed for the section of cold rolled steel, which can make full use of the bearing capacity after the buckling of the rod, while the hot rolled steel does not allow the local buckling of the section.
    The cause of residual 2, hot-rolled steel and cold-rolled steel stress are different, so the distribution on the section are quite different. The residual cold-formed steel section on stress
    The cloth is curved, and hot rolled steel or steel welding section on the residual stress distribution is thin.

    3, hot rolled steel free torsional stiffness ratio of cold-rolled steel high, so the torsional behavior of hot rolled steel is better than that of cold rolled steel.

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