Method for reducing banded structure of cold-rolled low-alloy high-strength steel
A banded structure and high-strength steel technology, applied in the field of metal processing, can solve the problems of high stamping scrap rate, lower steel plasticity, impact toughness and section shrinkage, and cold bending incompatibility, so as to reduce banded structure and reduce banded , the effect of uniform diffusion
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Embodiment 1
[0069] Take the H340LA(D) with a production specification of 3.0mm*1800mm as an example. The smelting components for producing H340LA(D) are specifically C with a mass ratio of 0.06% to 0.08%, silicon Si less than or equal to 0.05%, Mn at 0.60% to 0.70%, phosphorus P at 0.015% to 0.025%, and phosphorus P less than or equal to 0.010%. Sulfur S, 0.025% to 0.055% aluminum Al, 0.025% to 0.035% niobium Nb and nitrogen N less than or equal to 0.0060%.
[0070] The slab enters the heating furnace. The furnace time in the heating furnace is 245min, the soaking time is 52min, the outlet temperature of the second adding section is 1230°C, and the tapping temperature is 1280°C. When making the plan, the position of the rolling roll is arranged at the 13th block of the rolling. The initial descaling pressure is set to 19.5Mpa. The rough rolling adopts the 3+3 rolling mode, and the thickness of the middle slab of the exported slab is 38mm. Then, it is finished rolling by 7 finishing mi...
Embodiment 2
[0073] Take the H380LA(D) with a production specification of 5.0mm*1150mm as an example. The smelting composition of H380LA(D) is specifically C with a mass ratio of 0.06% to 0.08%, Si of 0.05% or less, Mn of 0.90% to 1.05%, P of 0.015% or less, S of 0.012% or less, and 0.025 % to 0.055% of Al, 0.03% to 0.04% of Nb and less than or equal to 0.0060% of N.
[0074] The slab enters the heating furnace. The furnace time in the heating furnace is 275min, the soaking time is 76min, the outlet temperature of the second adding section is 1205°C, and the tapping temperature is 1241°C. When making the plan, the rolling roll schedule is arranged at the 19th block of rolling. The initial descaling pressure is set to 22.0Mpa. The rough rolling adopts the 3+3 rolling mode, and the thickness of the middle slab of the exported slab is 44mm. Then, after finishing rolling by 7 finishing mills, the exit temperature of finishing rolling is 860°C. The layer cooling mode adopts the ultra-fast ...
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