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Hot-rolled
Advantages: can be destructive to ingot casting organizations, refined steel, grain, and the elimination of microstructure defects, thereby enabling organizations compacting steel, mechanical properties were improved. This improvement is mainly reflected in the direction along the rolling up, so that steel is no longer up to a certain extent are isotropic body; pouring when the formation of bubbles, cracks and loose, but also at high temperatures and under stress by bonding.
Disadvantage: 1. After hot rolling, the steel's internal non-metallic inclusions (mainly sulphides and oxides, have silicate) was pressure into a thin, appears stratified (laminated) situation. Stratified so that along the thickness direction of steel tensile performance significantly deteriorated, and there is likely to shrink when weld tear between layers. Weld contraction induced by local strain often reach several times the yield point strain t