Steel wire rod for high-strength boron-contained and annealing-free fastening piece and preparation method thereof
A high-strength fastener technology, applied in the field of materials, can solve the problems of plastic toughness and processing deformation ability that cannot meet market demand, and achieve the effects of reducing processing procedures and steel consumption, reducing production costs, and improving deformation ability of upset forging
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[0025] The preparation method of the boron-containing high-strength annealing-free fastener steel wire rod according to the present invention is characterized in that it comprises the following steps:
[0026] A. Hot metal pretreatment desulfurization: the chemical composition C4.5~5.0wt%, Si0.30~0.50wt%, Mn0.25~0.50wt%, P0.090~0.110wt%, S≤0.020wt%, the rest is Fe and unavoidable impurities in the blast furnace molten iron are transported to the KR method molten iron pretreatment device for desulfurization treatment, the insertion depth of the stirring head is controlled at 2200~2400mm, according to 15.0~17.0kg / 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 ≥ 4 / 5, and remove the desulfurization slag; the molten iron composition after pretreatment The control is: C4.5~4.8wt%, Si0.30~0....
Embodiment 1
[0053] A, hot metal pretreatment desulfurization: blast furnace hot metal (chemical composition C4.5wt%, Si0.30wt%, Mn0.25wt%, P0.090wt%, S0.012wt%, 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 2200-2400mm, according to 15.0kg / 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 ≥ 4 / 5, and remove the desulfurization slag; the molten iron composition after pretreatment The control is: C4.5wt%, Si0.30wt%, Mn0.25wt%, P0.090wt%, S0.002wt%, the rest is Fe and unavoidable impurities.
[0054] B, molten steel smelting: the pretreatment deep desulfurization hot metal of step A (chemical composition C4.5wt%, Si0.30wt%, Mn0.25wt%, P0.090wt%, S0.002wt%, the ...
Embodiment 2
[0067] A, hot metal pretreatment desulfurization: blast furnace hot metal (chemical composition C4.8wt%, Si0.40wt%, Mn0.38wt%, P0.102wt%, S0.017wt%, 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 2200-2400mm, according to 16.0kg / 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 ≥ 4 / 5, and remove the desulfurization slag; the molten iron composition after pretreatment The control is: C4.6wt%, Si0.40wt%, Mn0.38wt%, P0.102wt%, S0.003wt%, the rest is Fe and unavoidable impurities.
[0068] B, molten steel smelting: the pretreatment deep desulfurization hot metal of step A (chemical composition C4.6wt%, Si0.40wt%, Mn0.38wt%, P0.102wt%, S0.003wt%, the ...
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