performance will deteriorate, only for the simple deformation of the parts. Rolled hard roll can be used as raw material for hot dip galvanizing plant, because hot galvanizing units are equipped with annealing line. Hard rolling weight is generally 20-40 tons, coil at room temperature, the hot-rolled pickling roll for continuous rolling. The inner diameter is 610mm. Features: Because it has not been annealed, its hardness is very high (HRB> 90), machinability is very poor, only a simple direction of less than 90 degrees bending (perpendicular to the winding direction). Supplementary correction: Cold-rolled generally annealed. Second, the hot-rolled plate 1, the advantages can destroy the ingot casting organization, refine the grain of steel, and eliminate the microstructure defects, so that the steel tissue dense, mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that steel to some extent is no longer isotropic body; pouring bubble formation, cracks and loose, but also under high temperature and pressure welded. 2, Disadvantages (1) After hot rolling, the non-metallic inclusions (mainly sulfides and oxides, and silicates) inside the steel are pressed into flakes and stratification
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