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Nitrogen-rich microalloy fine grain HRB400E straight aseismic steel bar and preparation method thereof

An anti-seismic steel bar and micro-alloy technology, applied in the field of metallurgy, can solve the problems of high production cost of HRB400E straight bar, lower product market competitiveness, unfavorable production cost, etc., and achieve strong process applicability and controllability, fine grain Remarkable strengthening effect and low production cost

Active Publication Date: 2022-01-28
WUKUN STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high price of vanadium alloy and ferroniobium alloy, adding a certain amount of vanadium alloy or ferroniobium alloy to the steel will lead to high production cost of HRB400E straight bar, which is not conducive to the reduction of production cost of steel bar enterprises and the improvement of product market competitiveness

Method used

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  • Nitrogen-rich microalloy fine grain HRB400E straight aseismic steel bar and preparation method thereof
  • Nitrogen-rich microalloy fine grain HRB400E straight aseismic steel bar and preparation method thereof
  • Nitrogen-rich microalloy fine grain HRB400E straight aseismic steel bar and preparation method thereof

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preparation example Construction

[0019] The preparation method of a nitrogen-enriched microalloy fine-grained HRB400E straight anti-seismic steel bar of the present invention comprises the following steps:

[0020] A. Molten steel smelting: scrap steel, pig iron and molten iron at 200-210kg / t respectively 钢 、30kg / t 钢 , 840kg / t 钢 The proportion of the mixture 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 21-25kg / t 钢 , the addition of lightly burned dolomite is 12-15kg / t 钢 , the addition of magnesite balls is 1.0-2.0kg / t 钢 , control the carbon content at the end point ≥ 0.10wt%, and the tapping temperature ≤ 1640°C; press 3.0-3.8kg / t before tapping 钢The amount of low-grade waste vanadium slag that has been baked and dried is added to the ladle, and baked for 2 to 3 minutes; the tapping process adopts the whole bottom nitrogen blowing ...

Embodiment 1

[0039] A. Molten steel smelting: 200kg / t respectively 钢 、30kg / t 钢 The cold material is loaded into the proportion, and the steel scrap (chemical composition: C 0.07wt%, Si 0.20wt%, Mn 0.35wt%, P 0.025wt%, S 0.020wt% is added to the LD converter with the following mass ratio, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.0wt%, Si 0.20wt%, Mn 0.20wt%, P0.080wt%, S 0.025wt%, the rest is Fe and unavoidable impurities); Then press 840kg / 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 1320°C, molten iron composition C4.4wt%, Si 0.25wt%, Mn 0.20wt%, P 0.090wt%, S 0.025wt% , the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron are blended into the LD converter, then conventional top-bottom composite blowing is carried out, and conventional lime, lightly burned dolomite and magnesite balls are added to make slag, an...

Embodiment 2

[0051] A. Molten steel smelting: 205kg / t respectively 钢 、30kg / t 钢 The cold material is loaded into the proportion, and the scrap steel (chemical composition: C 0.14wt%, Si 0.30wt%, Mn 0.45wt%, P 0.035wt%, S 0.030wt% is added in the LD converter, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.1wt%, Si 0.30wt%, Mn 0.30wt%, P0.092wt%, S 0.032wt%, the rest is Fe and unavoidable impurities); Then press 840kg / 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 1330°C, molten iron composition C4.6wt%, Si 0.35wt%, Mn 0.28wt%, P 0.100wt%, S 0.035wt% , the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron are blended into the LD converter, then conventional top-bottom composite blowing is carried out, and conventional lime, lightly burned dolomite and magnesite balls are added to make slag, and the amount of lime added is ...

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PUM

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Abstract

The invention discloses a nitrogen-rich microalloy fine grain HRB400E straight aseismic steel bar and a preparation method thereof. The steel bar is prepared from the following chemical components in parts by weight: 0.21 to 0.25 weight percent of C, 0.42 to 0.55 weight percent of Si, 1.38 to 1.50 weight percent of Mn, 0.012 to 0.020 weight percent of V, less than or equal to 0.045 weight percent of S, less than or equal to 0.045 weight percent of P, 0.0090 to 0.0115 weight percent of N and the balance of Fe and inevitable impurities. The steel bar is prepared through the following steps of molten steel smelting, deoxidation alloying, molten steel argon station refining, molten steel casting, steel billet heating and steel billet controlled rolling and controlled cooling in sequence. The process disclosed by the invention has the characteristics of low production cost, high process applicability, high controllability and the like, and various strengthening effects such as precipitation strengthening, fine grain strengthening and the like are fully exerted by integrating and innovating chemical component design, converter smelting, a deoxidation alloying structure, continuous casting, a steel rolling heating schedule, rolling temperature and a controlled cooling process; and the produced reinforcing steel bar has the advantages of excellent and stable process mechanical properties, fine and uniform microscopic structure, good plasticity and toughness, excellent anti-seismic property and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a nitrogen-rich micro-alloy fine-grained HRB400E straight anti-seismic steel bar and a preparation method thereof. Background technique [0002] After the implementation of the GB / T 1499.2-2018 standard, domestic hot-rolled ribbed steel bar manufacturers basically use vanadium microalloying or niobium microalloying processes to produce straight ribbed steel bars, adding a certain amount of vanadium nitrogen alloy, nitriding Ferrovanadium or ferroniobium alloys. At the same time, by optimizing the chemical composition control and rolling process, it is ensured that the macroscopic metallography, microstructure and cross-sectional Vickers hardness of steel bars meet the inspection requirements of the new standard. [0003] At present, vanadium microalloying or niobium microalloying processes are used in China to produce straight ribbed steel bars. The preparation of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/60C22C33/06C21C7/00C21C7/06B22D11/00C21C5/28C21D8/08B21B1/16B21B37/74
CPCC22C38/02C22C38/04C22C38/12C22C38/001C22C38/60C22C33/06C21C7/0006C21C7/06B22D11/001C21C5/28C21D8/08C21D8/065B21B1/16B21B37/74C21D2211/005C21D2211/009Y02P10/20
Inventor 陈伟张卫强刘林刚吴光耀邹应春李艳萍向艳霞冯彦军柏承波
Owner WUKUN STEEL
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