Method for producing large thickness and high intensity steel plate for boiler drum
A high-strength steel plate and boiler steam drum technology, applied in the control of molten metal pouring from the ladle, rolling mill control device, metal rolling, etc., can solve the problems affecting the use of steel plates, etc., to reduce waste and achieve good comprehensive mechanical properties , Improve the effect of production success rate
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Embodiment 1
[0020] The actual composition (by weight percentage) of the steel produced by the method of this embodiment is: C 0.13%, Si0.40%, Mn 1.43%, P 0.008%, S 0.003%, Al 0.030%, Nb 0.012%, V 0.004% , Ni 0.83%, Ceq 0.43%, rolled into 135mm steel plate. Its mechanical properties: yield strength 587MPa, tensile strength: 688MPa, δ5 = 21.5%, 0 ℃ impact energy AKV (longitudinal) 184, 175, 162J, 370 ℃ high tension: yield strength 466MPa, tensile strength: 573MPa, δ5 = 22.5%.
[0021] The production method of this embodiment is as follows: (1) smelting: molten steel is first smelted in an electric furnace, sent into an LF refining furnace for refining, and fed with an Al wire for 300 meters, and when the ladle temperature is 1600 ° C, the ladle VD furnace is vacuum treated. Add 100kg of SiCa blocks into one ton of molten steel, vacuum degree 0.5 Torr, and break the vacuum when the vacuum holding time is 30 minutes, which solves the phenomenon that the molten steel is deoxidized by Al line ...
Embodiment 2
[0029] The production method of this embodiment is as follows: (1) Smelting: molten steel is first smelted in an electric furnace, sent to an LF refining furnace for refining, and fed with an Al wire of 400 meters. Add 95kg of SiCa blocks into the molten steel, vacuum degree 0.5 Torr, and break the vacuum when the vacuum holding time is 40 minutes, which solves the phenomenon that the molten steel is deoxidized by Al wire alone and the content of non-metallic inclusions in the steel is high, and ensures the purity of the steel quality;
[0030] (2) Casting: After the vacuum is broken, the temperature is 1555°C, and then the 31T flat ingot mold is used for casting to ensure that the large-thickness, large-weight steel plate has sufficient reduction and raw materials;
[0031] (3) Heating: In order to avoid cracking on the surface of low-alloy high-strength steel ingots, the steel ingots should be delivered warm, warm cleaned, and warm loaded. The particles are small, low-speed ...
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