High nitrogen-vanadium microalloying large-scale anti-seismic reinforcing steel bar preparation method
A seismic steel bar, alloying technology, applied in the direction of manufacturing tools, manufacturing converters, heat treatment equipment, etc., can solve problems such as unfavorable steel production costs, high production costs, and reduction of product market competitiveness.
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[0047] A method for preparing nitrogen-enriched vanadium microalloyed HRB600 ultrafine-grain anti-seismic steel bars, specifically comprising the following steps:
[0048] A. Molten steel smelting: scrap steel, pig iron and molten iron at 130-160kg / t respectively 钢 、20kg / t 钢 、900-930kg / t 钢 The ratio is added to the LD converter, and then the conventional top-bottom compound blowing is carried out, and conventional lime, light-burned dolomite, and magnesite balls are added to make slag, and the amount of lime added is 25-30kg / t 钢 , the addition of lightly burned dolomite is 12-18kg / t 钢 , the addition of magnesite balls is 1.0kg / t 钢 , the carbon content at the control end point is ≥0.06wt%, the tapping temperature is ≤1630°C; the steel ladle is 6.0kg / t before tapping 钢 Add the following mass ratio of vanadium-containing pig iron: composition C 3.5wt%, Si 0.40wt%, Mn 0.65wt%, V 1.00-1.20wt%, P 0.205wt%, S0.075wt%, the rest is Fe and not Impurities to avoid, add vanadium-cont...
Embodiment 1
[0067] The preparation method of nitrogen-rich vanadium microalloyed HRB600 ultra-fine grain anti-seismic steel bar specifically includes the following steps:
[0068] A. Molten steel smelting: 130kg / t respectively 钢 、20kg / t 钢 The cold material is loaded into the proportion, and the scrap steel (chemical composition: C 0.12wt%, Si 0.20wt%, Mn 0.45wt%, P 0.025wt%, S 0.020wt% is added in the LD converter, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.0wt%, Si 0.30wt%, Mn 0.45wt%, P0.070wt%, S 0.020wt%, the rest is Fe and unavoidable impurities); Then press 930kg / t 钢 The proportion of molten iron is loaded into the LD converter with the following temperature and mass ratio of molten iron: molten iron temperature 1280 ° C, molten iron composition C 4.4wt%, Si0.25wt%, Mn 0.45wt%, P 0.075wt%, S 0.020wt% , the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron are blended into the LD converter, then conventional top-bo...
Embodiment 2
[0082] The preparation method of nitrogen-rich vanadium microalloyed HRB600 ultra-fine grain anti-seismic steel bar specifically includes the following steps:
[0083] A. Molten steel smelting: 145kg / t respectively 钢 、20kg / t 钢 The cold material is loaded into the proportion, and the scrap steel (chemical composition: C 0.18wt%, Si 0.27wt%, Mn 0.55wt%, P 0.035wt%, S 0.032wt% is added in the LD converter, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.2wt%, Si 0.40wt%, Mn 0.57wt%, P0.080wt%, S 0.030wt%, the rest is Fe and unavoidable impurities); Then press 915kg / t 钢 The proportion of molten iron is loaded into the LD converter with the following temperature and mass ratio of molten iron: molten iron temperature 1300 ° C, molten iron composition C 4.5wt%, Si0.37wt%, Mn 0.58wt%, P 0.092wt%, S 0.030wt% , the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron are blended into the LD converter, then conventional top-...
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