A kind of production method of ultra-low phosphorus hydrogen-prone steel
A production method and technology for hydrogenated steel, applied in the direction of manufacturing converters, etc., can solve problems such as failure to meet ultra-low phosphorus control requirements and non-compliance with performance
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Embodiment 1
[0043] A production method of ultra-low phosphorus hydrogen-prone steel, comprising the following steps:
[0044] Step S1: Pretreatment of molten iron. After the molten iron is desulfurized by the KR method, the temperature is 1350°C and the sulfur content is 0.010%. During this process, the initial sulfur content of the molten iron is 0.039%. The amount of calcium oxide added is 450kg;
[0045] Step S2: LD converter smelting, the loading capacity of the converter is 105 tons, of which 80 tons of molten iron and 25 tons of scrap steel are smelted. During the smelting process, the oxygen content is controlled at 1000ppm, and the blowing gun position is controlled at 1.3m in the early stage. The position of the blowing gun is controlled between 1.0m, the temperature of the pouring is 1550°C, the spot blowing time is controlled within 2 minutes, the number of spot blowing is 2 times, and the converter smelting end point, the carbon content in molten steel is 0.04%, and the phosph...
Embodiment 2
[0058] A production method of ultra-low phosphorus hydrogen-prone steel, comprising the following steps:
[0059] Step S1: Pretreatment of molten iron. After the molten iron is desulfurized by the KR method, the temperature is 1360°C and the sulfur content is 0.008%. The amount of calcium oxide added is 480kg;
[0060]Step S2: LD converter smelting, the loading capacity of the converter is 100 tons, of which, 75 tons of molten iron and 25 tons of scrap steel are smelted. During the smelting process, the oxygen content is controlled to 1040ppm, the blowing gun position is controlled at 1.3m in the early stage, and the middle and late stage The position of the blowing gun is controlled between 0.9m, the temperature of the pouring is 1550°C, the spot blowing time is controlled within 2 minutes, the number of spot blowing is 1 time, the converter smelting end point, the carbon content in the molten steel is 0.03%, and the phosphorus content is 0.010%. No deoxidizer, slagging mate...
Embodiment 3
[0073] A production method of ultra-low phosphorus hydrogen-prone steel, comprising the following steps:
[0074] Step S1: Pretreatment of molten iron. After the molten iron is desulfurized by the KR method, the temperature is 1365°C and the sulfur content is 0.006%. During this process, the initial sulfur content of the molten iron is 0.041%. Calcium oxide addition is 465kg;
[0075] Step S2: LD converter smelting, the loading capacity of the converter is 100 tons, of which 80 tons of molten iron and 20 tons of scrap steel are smelted. The smelting gun position is controlled between 1.1m, the pouring temperature is 1550°C, the point blowing time is controlled within 2 minutes, the number of point blowing is 2 times, the end point of converter smelting, the carbon content in molten steel is 0.03%, and the phosphorus content is 0.011%. No deoxidizer, slagging material and alloy are added, and argon blowing process is not carried out. After tapping, the temperature of molten st...
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