Preparation method of high-quality 40Cr alloy structure straight-bar round steel
A high-quality, alloy technology, applied in the manufacture of converters, etc., can solve the problems of unreasonable microstructure and proportion, low area reduction rate, low upsetting pass rate, high gas content and inclusions, etc., to achieve good display Microstructure, excellent plasticity and toughness and machinability, and high cleanliness
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[0020] The preparation method of high-quality 40Cr alloy structure straight bar round steel of the present invention comprises the following steps:
[0021] A. Hot metal pretreatment desulfurization: transport the blast furnace hot metal to the KR method hot metal pretreatment device for desulfurization treatment, the insertion depth of the stirring head is controlled at 2300~2500mm, and the amount of steel is 14.0~16.0 kg / t, and CaO desulfurizer is added for desulfurization For processing, the stirring time is controlled to be 8 minutes; after the stirring is completed, the slag removal operation is carried out to ensure that the molten iron surface in the ladle is exposed ≥ 3 / 4, and the desulfurization slag is removed to obtain the pretreated molten iron;
[0022] B. Molten steel smelting: Add the pretreated molten iron and high-quality steel scrap into the LD converter for top-bottom combined blowing, respectively, at 30.0-34.0kg / t steel, 20.0-24.0kg / t steel, 2.0- Adding am...
Embodiment 1
[0045] A, molten iron pretreatment desulfurization: blast furnace molten iron (chemical composition C 3.8wt%, Si 0.40wt%, Mn 0.30wt%, P0.110wt%, S 0.020wt%, the rest is Fe and unavoidable impurities) transport To the KR method molten iron pretreatment device for desulfurization treatment, the insertion depth of the stirring head is controlled at 2300mm, according to 14.0kg / t 钢 Add the conventional CaO-based desulfurizer for desulfurization treatment, and control the stirring time to 8 minutes; after the stirring, carry out the slag removal operation to ensure that the molten iron surface in the ladle is exposed ≥ 3 / 4, and remove the desulfurization slag; after pretreatment, the molten iron composition The control is: C 3.8wt%, Si 0.40wt%, Mn 0.30wt%, P 0.110wt%, S0.003wt%, the rest is Fe and unavoidable impurities.
[0046] B, molten steel smelting: the pretreatment deep desulfurization hot metal of A step (chemical composition C 3.8wt%, Si 0.40wt%, Mn0.30wt%, P 0.110wt%, S 0....
Embodiment 2
[0060] A, hot metal pretreatment desulfurization: blast furnace hot metal (chemical composition C 4.0wt%, Si 0.50wt%, Mn 0.40wt%, P0.100wt%, S0.018wt%, the rest is Fe and unavoidable impurities) transport Go to the KR method molten iron pretreatment device for desulfurization treatment. The insertion depth of the stirring head is controlled at 2400mm. According to the amount of 15.0 kg / t steel, add conventional CaO desulfurization agent for desulfurization treatment. The stirring time is controlled at 8 minutes; After the slag operation, ensure that the molten iron surface in the ladle is exposed ≥ 3 / 4, and remove the desulfurization slag; the composition of the molten iron after pretreatment is controlled as follows: C 4.0wt%, Si 0.50wt%, Mn 0.40wt%, P 0.100wt%, S0. 0.02wt%, the rest is Fe and unavoidable impurities.
[0061] B, molten steel smelting: the pretreatment deep desulfurization hot metal of step A (chemical composition C 4.0wt%, Si 0.50wt%, Mn0.40wt%, P 0.100wt%, S...
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