Cold rolled steel plate is rolled out on the basis of hot rolled coil, generally speaking, is hot rolled → pickling passivation → cold rolled such a process. Although in the process because of rolling will also make the steel plate temperature, but still called cold rolled.
Because of the hot rolled after continuous cold transformation into cold rolled, in the mechanical properties are relatively poor, hardness is too high. Must be faded to restore its mechanical properties, no fading called rolled hard volume. Rolled hard volume is generally used to do without bending, stretching products.
But the cold rolled steel plate forming steel wall thickness is small, the ability to withstand localised concentrated load is weak, and there are still residual stresses in the cross-section after shaping, so that the cold rolled steel plate buckling performance deterioration, torsion performance is poor, corrosion resistance is poor.
Therefore, cold rolled steel plate often choose to use stainless steel pickling passivation solution to do pickling passivation treatment process, stainless steel pickling passivation solution can be in the passivation at the same time to remove the surface of the very thin chromium-poor layer of metal. When the oxide skin is removed, the whole reaction is transformed into a passivation process, forming an effective passivation protection. Can be all kinds of stainless steel surface oil, oxide skin, welding spots and rust and other phenomena completely removed, and the formation of a uniform silver-white passivation film, greatly improving the corrosion resistance of the workpiece.
Post time: Jan-06-2024