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Large-specification fine-grain high-strength anti-seismic reinforcement steel bars and preparation method thereof

An anti-seismic steel bar and high-strength technology is applied in the field of large-scale fine-grained and high-strength seismic-resistant steel bars and their preparation. The effect of improving corrosion resistance and improving seismic performance

Active Publication Date: 2020-05-05
WUKUN STEEL
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The first purpose of the present invention is to provide a new Φ28-36mm HRB600 high-strength anti-seismic steel bar for hydropower project, aiming at the problems of high cost or complex process and unstable performance of the steel bar in the production of large-scale HRB500 and HRB600 high-strength anti-seismic steel bars for hydropower station engineering Steel bar and its preparation method, the second purpose of the present invention is to provide a niobium-chromium microalloying production nominal diameter of 32-40mm HRB400E fine-grained steel bar aimed at the problem of high production cost of large-scale HRB400E steel bars with a nominal diameter of 32mm and above. Preparation method of high strength and toughness anti-seismic steel bar

Method used

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  • Large-specification fine-grain high-strength anti-seismic reinforcement steel bars and preparation method thereof
  • Large-specification fine-grain high-strength anti-seismic reinforcement steel bars and preparation method thereof
  • Large-specification fine-grain high-strength anti-seismic reinforcement steel bars and preparation method thereof

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preparation example Construction

[0047] The invention also provides a preparation method of Φ28-36mm HRB600 high-strength seismic steel bars for hydropower station engineering, which specifically includes the following steps:

[0048] A. Molten steel smelting: the chemical composition C 4.0-5.0wt%, Si 0.30-0.55wt%, Mn 0.30-0.60wt%, P0.080-0.120wt%, S≤0.045wt%, the rest is Fe and unavoidable Impurity molten iron, chemical composition C 0.12-0.20wt%, Si 0.15-0.35 wt%, Mn 0.35-0.65wt%, P 0.025-0.040wt%, S 0.025-0.040wt%, the rest is Fe and unavoidable Impurity scrap steel and chemical composition C 3.0-3.5wt%, Si 0.30-0.55wt%, Mn0.40-0.65wt%, P 0.060-0.100wt%, S 0.030-0.050wt%, the rest is Fe and unavoidable The impurity pig iron is 930-940kg / t steel , 100-115kg / t steel , 30-40kg / t steel It is added to a 120-ton converter for conventional top-bottom composite blowing, and lime, dolomite, and magnesite balls are added in the conventional amount to make slag. The end-point carbon content is controlled to 0.08-0.12wt%...

Embodiment 1

[0057] This embodiment provides a Φ28mm large-size HRB600 high-strength seismic steel bar for hydropower station engineering, which is prepared through the following process steps:

[0058] A. Molten steel smelting: the chemical composition C 4.0wt%, Si 0.30wt%, Mn 0.30wt%, P 0.080wt%, S0.020wt%, the rest is Fe and unavoidable impurities of molten iron, chemical composition C 0.12 wt%, Si 0.15wt%, Mn0.35wt%, P 0.025wt%, S 0.025wt%, the rest is Fe and not t steel Avoidable impurities of steel scrap and chemical composition C3.0wt%, Si 0.30wt%, Mn 0.40wt%, P 0.060wt%, S 0.030wt%, the rest are Fe and unavoidable impurities of pig iron respectively 930kg / , 100kg / t steel , 30kg / t steel It is added to a 120-ton converter for conventional top-bottom composite blowing, lime, dolomite, and magnesite balls are added to make slag according to the conventional amount. The end-point carbon content is controlled to 0.08wt%, and the tapping temperature is 1640°C; the bottom of the ladle before t...

Embodiment 2

[0069] This embodiment 2 provides a Φ32mm large-size HRB600 high-strength seismic steel bar used in hydropower stations, which is prepared through the following process steps:

[0070] A. Molten steel smelting: the chemical composition C 4.5wt%, Si 0.42wt%, Mn 0.45wt%, P 0.100wt%, S0.035wt%, the rest is Fe and unavoidable impurities of molten iron, chemical composition C 0.16 wt%, Si 0.25 wt%, Mn0.50wt%, P 0.032wt%, S 0.032wt%, the rest is scrap steel with Fe and unavoidable impurities and chemical composition C3.2wt%, Si 0.42 wt%, Mn 0.52 wt%, P 0.080wt%, S 0.040wt%, the rest is Fe and unavoidable impurities of pig iron at 935kg / t steel , 110kg / t steel , 35kg / t steel It is added to a 120-ton converter for conventional top-bottom composite blowing, lime, dolomite, and magnesite balls are added in the conventional amount to make slag. The end-point carbon content is controlled to 0.10wt% and the tapping temperature is 1655℃; before tapping, it faces the bottom of the ladle. Add li...

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Abstract

The invention discloses theta 28-36mm HRB600 high-strength anti-seismic reinforcement steel bars for a hydropower project. The reinforcement steel bars are characterized in that steel comprises the following chemical components by weight: C 0.23-0.26wt%, Si 0.50-0.65wt%, Mn 1.45-1.55wt%, S 0.025-0.035wt%, P 0.030-0.040wt%, Cr 0.12-0.18wt%, Mo 0.020-0.035wt%, V 0.125-0.140wt%, and the balance beingFe and inevitable impurities. The invention also discloses a preparation method of the large-specification HRB600 high-strength anti-seismic reinforcement steel bars. A vanadium, chromium and molybdenum composite microalloying process is adopted, microalloying strengthening elements such as vanadium-nitrogen alloy, ferrochromium and ferromolybdenum are added into the steel, and the low final rolling temperature is controlled by a pre-penetrating water-controlled cooling device (4.9m in length) in the steel rolling process, the formation and precipitation of fine and dispersed microalloy carbon (nitrogen) secondary phase are promoted, and the toughness is obviously improved during improvement of steel strength. The reinforcement steel bars can be used for sdam and flood control tunnel construction engineering and road and bridge engineering of the Jinshajiang hydropower station, and has the advantages of low production cost, strong process applicability, reliable operation, stable product and the like.

Description

Technical field [0001] The invention relates to a large-size fine-grained high-strength seismic steel bar and a preparation method thereof, in particular to a large-size Φ28-36mm HRB600 high-strength controlled-rolled steel bar for hydropower station engineering and a preparation method thereof, and also relates to a production of HRB400E fine-grain high-strength steel with a nominal diameter of 32-40mm Method for preparing tough seismic steel bars. Background technique [0002] Large-size HRB500 and HRB600 high-strength seismic steel bars are required for large-scale HRB500 and HRB600 high-strength seismic steel bars, such as dams, flood control tunnels, and bridges of Yumo Railway, and mechanical or sleeve connection must be used during construction. The steel bars currently on the market have different microalloying elements used by steel mills to reduce production costs, different rolling process parameters, and different methods of controlled cooling after rolling. The quali...

Claims

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Application Information

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IPC IPC(8): C22C38/24C22C38/22C22C38/02C22C38/04C22C33/06C21C7/06C21C7/00C21C7/072C21D8/08
CPCC21C7/0006C21C7/06C21D8/065C21D8/08C21D2211/002C21D2211/005C21D2211/009C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/26Y02P10/20
Inventor 陈伟张卫强邓家木吴光耀郭继祥王文锋段鹏杰文玉兵胡威刘红兵朱艳红曹云刘林刚苏灿东
Owner WUKUN STEEL
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