Submerged arc welding wire steel for low-temperature steel plate welding and preparation method thereof
A technology of submerged arc welding wire and welding wire steel, which is applied in the field of welding steel, which can solve the problems of large fluctuations in the quality of submerged arc welding wire steel wire rods, difficulties in using the effect as expected, and large fluctuations in the mechanical properties of welds, etc., to achieve suitable industrial production , enhance the stability of the mechanical properties of the weld, and improve the effect of the submerged arc effect
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[0028] The invention provides a method for preparing submerged arc welding wire steel for low-temperature steel plate welding, comprising the following steps:
[0029] 1. Mix molten iron and a desulfurizer for KR desulfurization, so that the sulfur content in the molten iron is ≤0.010wt%, and the phosphorus content is ≤0.125wt%, to obtain desulfurized molten iron. The desulfurizer includes lime and fluorite;
[0030] 2. Put the desulfurized molten iron and steel scrap into the converter for converter smelting, add converter smelting slagging material during the smelting process to obtain the converter smelting terminal molten steel, the converter smelting slagging material includes lime and magnesium balls, the desulfurized molten iron and The mass ratio of steel scrap is 7-9:1-3, and P≤0.008wt%, S≤0.010wt%, C: 0.05-0.07wt% in the molten steel at the end of converter smelting;
[0031] 3. adding ferro-aluminum manganese and low-carbon ferro-manganese to carry out deoxidation a...
Embodiment 1
[0053] Process equipment configuration: 80tKR desulfurization, 80t top-bottom combined blowing converter, 80tLF refining furnace, 6 machines / 6 streams continuous casting machine (R9m, 160mm*160mm).
[0054] (1) KR desulfurization: the S content of molten iron entering the station is 0.035%, the P content is 0.115%, add lime 13kg / t molten iron, fluorite 1.5kg / t molten iron, stir for 10 minutes, take samples for analysis after removing slag from the molten iron, the S content of the molten iron is 0.005% .
[0055] (2) Converter smelting: The ratio of desulfurized hot metal to scrap steel in the converter is 7:3, the total amount of lime 50kg / t, the total amount of magnesium balls 8kg / t are added, the slagging material is added in two batches, and the blowing is started 2 / 3 of the slagging material is added before 5 minutes, and the rest of the slagging material is preferably added within 10 minutes of blowing. In the converter smelting process, the gun position is 1.2m in the ...
Embodiment 2
[0062] Process equipment configuration: 80tKR desulfurization, 80t top-bottom combined blowing converter, 80tLF refining furnace, 6 machines / 6 streams continuous casting machine (R9m, 160mm*160mm).
[0063] (1) KR desulfurization: The S content of molten iron entering the station is 0.035%, the P content is 0.125%, add lime 14.5kg / t molten iron, fluorite 1.5kg / t molten iron, stir for 10 minutes, and take samples for analysis after removing slag from the molten iron. The S content of the molten iron is 0.006 %.
[0064] (2) Converter smelting: The ratio of desulfurized hot metal to scrap steel in the converter is 8:2, the total amount of lime 55kg / t, the total amount of magnesium balls 10.5kg / t are added, and the slagging material is added in two batches. Add 2 / 3 of the slagging material before blowing for 5 minutes, and the rest of the slagging material is preferably added within 10 minutes of blowing. In the converter smelting process, the gun position is 1.2m in the early s...
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