Super-thick steel plate and production technology thereof
A technology of extra-thick steel plate and production process, which is applied in the field of steel rolling, can solve the problems of poor internal quality, long production cycle, and take into account at the same time, and achieve the effects of high production efficiency, low production cost, and short production cycle
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Embodiment 1
[0025] Present embodiment is the production technology that adopts 700mm thick steel ingot to roll 190mm extra-thick steel plate for plastic mould, and production technology is carried out according to the following procedures:
[0026] (1) Smelting: The blast furnace molten iron is pretreated and put into the electric furnace with high-quality scrap steel. After the electric furnace is smelted, it is refined by the LF furnace and VD vacuum degassing treatment. The weight percentage of the molten steel composition meets the following requirements. 33%, Si0.46%, Mn1.48%, P≤0.005%, S≤0.003%, Cr1.94%, Mo0.53%, Ni0.19%, the balance is Fe and unavoidable impurities, tapping pouring.
[0027] (2) Casting: Before the molten steel is poured, the riser box including the internal insulation material is preheated to 660°C, the steel ingot model cavity is filled with argon, and the casting is carried out under the protection of argon, which can reduce entrainment and secondary Sub-oxidat...
Embodiment 2
[0037] This implementation example is the production process of rolling 270mm thick steel plate for plastic moulds, using a 700mm thick steel ingot, and the production process is carried out according to the following procedures:
[0038] (1) Smelting: The blast furnace molten iron is pretreated and put into the electric furnace with high-quality scrap steel. After the electric furnace is smelted, it is refined by the LF furnace and VD vacuum degassing treatment. The weight percentage of the molten steel composition meets the following requirements. 35%, Si0.49%, Mn1.52%, P≤0.006%, S≤0.004%, Cr2.06%, Mo0.57%, Ni0.21%, the balance is Fe and unavoidable impurities, tapping pouring.
[0039] (2) Casting: Before the molten steel is poured, the riser box including the internal insulation material is preheated to 670°C, the steel ingot model cavity is filled with argon, and the casting is carried out under the protection of argon, which can reduce entrainment and secondary Sub-oxid...
Embodiment 3
[0049] This implementation example is the production process of rolling a 350mm thick steel plate for plastic molds using a 900mm thick steel ingot. The production process is carried out according to the following procedures:
[0050] (1) Smelting: The blast furnace molten iron is pretreated and put into the electric furnace with high-quality scrap steel. After the electric furnace is smelted, it is refined by the LF furnace and VD vacuum degassing treatment. The weight percentage of the molten steel composition meets the following requirements. 36%, Si0.50%, Mn1.56%, P≤0.007%, S≤0.004%, Cr2.1%, Mo0.59%, Ni0.22%, the balance is Fe and unavoidable impurities, tapped pouring.
[0051] (2) Casting: Before the molten steel is poured, the riser box including the internal insulation material is preheated to 680°C, the steel ingot model cavity is filled with argon, and the casting is carried out under the protection of argon, which can reduce the entrained gas and secondary Sub-oxid...
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