700 MPa-stage-or-over ultra-high-strength weather-resisting steel plate and hot continuous rolling production method thereof
An ultra-high-strength, hot continuous rolling technology, applied in the field of iron and steel smelting, can solve the problems of unsatisfactory weather-resistant steel plate strength, complicated process, and low production efficiency, and achieve good weather resistance, simple process, and high production efficiency.
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Embodiment 1
[0051] First of all, it is produced by the "full three desulfurization" process, using low-sulfur blast furnace molten iron as raw material, the molten iron is desulfurized by KR, the sulfur content in the molten iron is reduced from 0.039% to 0.0004%, and the desulfurized molten iron is mixed into a 300-ton dephosphorization converter for desulfurization Silicon dephosphorization treatment, adding 17 tons of scrap steel to the dephosphorization furnace, after 7 minutes of oxygen blowing, the semi-steel is produced, the composition of the semi-steel is: C 3.32%, P0.022%, S 0.005%, and then 300 tons of decarburization converter Load copper plates, nickel plates and semi-steel for further decarburization and temperature-raising blowing. The final composition is: C 0.039%, P0.0065%, S0.007%, and the tapping temperature of the converter is 1676°C. During the process, Si-Mn, medium carbon Mn-Fe and Cr-Fe are added for alloying treatment. When the molten steel in the ladle is about 1...
Embodiment 2
[0058]First of all, it is produced by the "full three desulfurization" process, using low-sulfur blast furnace molten iron as raw material. The molten iron is desulfurized by KR, and the sulfur content in the molten iron is reduced from 0.034% to 0.0001%. The desulfurized molten iron is mixed into a 300-ton dephosphorization converter for desulfurization Silicon dephosphorization treatment, adding 17 tons of scrap steel to the dephosphorization furnace, after 8 minutes of oxygen blowing, the semi-steel is produced, the composition of the semi-steel is: C 3.29%, P0.024%, S 0.004%, and then 300 tons of decarburization converter Load copper plates, nickel plates and semi-steel for further decarburization and temperature-raising blowing. The final composition is: C 0.034%, P0.008%, S0.007%, and the tapping temperature of the converter is 1667°C. During the process, Si-Mn, medium carbon Mn-Fe and Cr-Fe are added for alloying treatment. When the molten steel in the ladle is about 120...
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