A production method of low-cost high-toughness q460qnhd steel plate
A steel plate production method and high-toughness technology, applied in metal rolling and other directions, can solve the problem of low toughness and achieve the effects of good toughness, short manufacturing cycle, and high furnace temperature
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Embodiment 1
[0028] It is produced by a wide and heavy plate rolling mill, using a slab with a thickness of 250mm and a width of 2000mm, the center segregation of the slab is C2.0, and rolled into a 15mm thick steel plate. The molten steel is treated with RH, the vacuum degree is below 110Pa for 18.5 minutes, the superheat degree during slab casting is 26℃, the continuous casting adopts electromagnetic stirring and light pressing, the electromagnetic stirring frequency is 6.5Hz, and the current is 310A. The pressing positions are 7, 8 and 9, and the pressing amount is 2.6mm, 2.6mm and 2.6mm. After the slab is cast from the casting machine and cut, before entering the heating furnace, the surface is sprayed with water for laminar flow cooling. During laminar cooling, the water flow density on the upper surface of the slab is 185l / (min·m^ 2 ); the ratio of water flow density on the upper and lower surfaces of the slab is 1:2.8. Cooldown is 80 seconds. When entering the furnace, the surface...
Embodiment 2
[0038] It is produced by a wide and heavy plate rolling mill, using a slab with a thickness of 250mm and a width of 2000mm, the center segregation of the slab is C0.5, and rolled into a 32mm thick steel plate. The molten steel is treated with RH. The time for the vacuum degree to be below 110Pa is 19.5 minutes. The superheat degree during slab casting is 13℃. The continuous casting adopts electromagnetic stirring and light pressing. The electromagnetic stirring frequency is 6.5Hz and the current is 310A. The pressing positions are 7, 8 and 9, and the pressing amount is 2.6mm, 2.6mm and 2.6mm. The slab is cast from the casting machine, and after cutting, the surface is sprayed with water for laminar flow cooling before entering the heating furnace. During laminar cooling, the water flow density on the upper surface of the slab is 188l / (min·m^ 2 ); the ratio of water flow density on the upper and lower surfaces of the slab is 1:2.8. Cooldown is 110 seconds. When entering the f...
Embodiment 3
[0048] It is produced by a wide and heavy plate rolling mill, using a slab with a thickness of 250mm and a width of 2000mm, the center segregation of the slab is C1.0, and rolled into a 22mm thick steel plate. The molten steel is subjected to RH treatment. The time when the vacuum degree is below 110Pa is 19.0 minutes, and the superheat degree during slab casting is 18°C. The continuous casting adopts electromagnetic stirring and light pressing, the electromagnetic stirring frequency is 6.5Hz, and the current is 310A. The pressing positions are 7, 8 and 9, and the pressing amount is 2.6mm, 2.6mm and 2.6mm. After the slab is cast from the casting machine and cut, before entering the heating furnace, the surface is sprayed with water for laminar flow cooling. During laminar cooling, the water flow density on the upper surface of the slab is 192l / (min·m^ 2 ); the ratio of water flow density on the upper and lower surfaces of the slab is 1:2.8. Cooldown is 95 seconds. When enter...
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