Method for directly smelting alloy steel by using furnace-washed steel
A direct technology for washing furnace steel, applied in the field of electric arc furnace steelmaking, can solve the problem of not finding smelting alloy varieties of steel, etc., and achieve the effect of good benefits
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Embodiment 1
[0024] Example 1 The production process of smelting 27MnCr in the first furnace of the new electric furnace body
[0025] The first furnace of the new furnace body of the electric furnace smelts 27MnCr steel, and the following parameters are controlled:
[0026] [1] Electric furnace tapping [C] = 0.06%, slag (MgO) = 2.7%, tapping temperature 1634°C.
[0027] [2] The time of LF refining furnace is 75min, and the tapping temperature is 1647℃.
[0028] [3] The vacuum degree of the molten steel VD furnace vacuum treatment is 65Pa, and the treatment time is 17min.
[0029] [4] After the VD vacuum treatment, the static blowing time of molten steel is 13min, and the flow rate of argon gas is 65Nl / min.
[0030] [5] Cast into ∮280mm continuous casting slab, sampling analysis, the result: [H]=1.1×10 -6 , [O]=20×10 -6 .
[0031] [6] The rating results of non-metallic inclusions after continuous casting slab rolling are shown in Table 1.
Embodiment 2
[0032] Example 2 The production process of smelting 37Mn2 in the third furnace of the new electric furnace body
[0033] The third furnace of the new furnace body of the electric furnace smelts 37Mn2 steel, and the following parameters are controlled:
[0034] [1] Electric furnace tapping [C] = 0.09%, slag (MgO) = 3.2%, tapping temperature 1628°C.
[0035] [2] The time of LF refining furnace is 62min, and the tapping temperature is 1643℃.
[0036] [3] The vacuum degree of vacuum treatment of molten steel VD furnace is 41Pa, and the treatment time is 16min.
[0037] [4] After the VD vacuum treatment, the static blowing time of molten steel is 16min, and the flow rate of argon gas is 60Nl / min.
[0038] [5] Cast into ∮350mm continuous casting slab Sampling result: [H]=0.6×10 -6 , [O]=17×10 -6 .
[0039] [6] The rating results of non-metallic inclusions after continuous casting slab rolling are shown in Table 1.
Embodiment 3
[0040] Example 3 Production process for smelting X42 steel in the first furnace body of electric furnace slag changing line
[0041] The first heat of the furnace body of the electric furnace slag change line is used to smelt X42 steel, and the following parameters are controlled:
[0042] [1] Electric furnace tapping [C] = 0.04%, slag (MgO) = 2.5%, tapping temperature 1651°C.
[0043] [2] The time of LF refining furnace is 67min, and the tapping temperature is 1655℃.
[0044] [3] The vacuum degree of vacuum treatment of molten steel VD furnace is 37Pa, and the treatment time is 18min.
[0045] [4] After the VD vacuum treatment, the static blowing time of molten steel is 17min, and the flow rate of argon gas is 40Nl / min.
[0046] [5] Cast into ∮200mm continuous casting slab Sampling result: [H]=0.8×10 -6 , [O]=24×10 -6 .
[0047] [6] The rating results of non-metallic inclusions after continuous casting slab rolling are shown in Table 1.
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