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Wide-flange heavy hot-rolled H-shaped steel, and production method and application thereof

A production method and technology for H-beams, applied in the field of rolling steel production, can solve the problem that the width of the flange cannot meet the requirements of the supporting structure of the foundation pit, etc.

Active Publication Date: 2021-11-05
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Publication number CN110546295A published on December 6, 2019, titled "Rolled H-shaped steel and manufacturing method", the invention relates to a rolled H-shaped steel, the size of the rolled H-shaped steel is 700-1000mm in height, flange The width is 200-400mm, the thickness of the flange is 22-40mm, and the thickness of the web is more than 16mm. The width and thickness of the flange cannot meet the requirements of the foundation pit support structure of high-rise super high-rise buildings.

Method used

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  • Wide-flange heavy hot-rolled H-shaped steel, and production method and application thereof
  • Wide-flange heavy hot-rolled H-shaped steel, and production method and application thereof

Examples

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Embodiment 1

[0067] The rolling specifications in this example are H500×500 series specifications, the thickness of the flange is 130mm, and the components of the steel are: C: 0.12%, Si: 0.41%, Mn: 1.45%, P: 0.011%, S: 0.007%; V: 0.04%, Nb: 0.040%, H: 0.00010%, N: 0.005%, Alt: 0.012%, and the rest are Fe and trace residual elements. Adopt production technique of the present invention to produce, wherein process parameter control is as follows:

[0068] A. Blank heating: heating temperature 1250°C, time in furnace 40min;

[0069] B. Descaling: when descaling, the running speed of the rolled piece is 1.6m / s, and the descaling water pressure is 17MPa;

[0070] C. Billet rolling: The billet is roughly rolled by a two-roller reversible billet mill. The billet is first rolled in two passes in a box-shaped pass to reduce the height of the billet. The height is 740mm and the inner width is 340mm. The temperature is 1200°C, the final rolling temperature is 1070°C, and the rolling reduction ratio...

Embodiment 2

[0077] The specification of this embodiment and the composition of steel are identical with embodiment 1. The post-rolling controlled cooling process selects the post-rolling quenching self-tempering process, and its self-tempering temperature is 600 ° C. The remaining production process control parameters are the same as in Example 1. The mechanical properties are tested. The yield strength is 436MPa, and the tensile strength is 621MPa, the yield ratio is 0.70, the elongation after fracture is 22%, and the impact energy KV2 at 0°C is 56J. The flange width in the cross-sectional dimension of the finished product is 510mm.

Embodiment 3

[0079] The specification of this embodiment is H600×500 series, the thickness of the flange is 90mm; the steel components are: C: 0.13%, Si: 0.41%, Mn: 1.45%, P: 0.012%, S: 0.008%, V: 0.041%, Nb: 0.039%, H: 0.00013%, N: 0.004%, Alt: 0.013%, and the rest is Fe and trace residual elements. Adopt production technology of the present invention to produce, wherein rolling process parameter control is as follows:

[0080] A. Billet heating: The billet is a special-shaped billet, the heating temperature in the heating furnace is 1240 ° C, and the time in the furnace is 38 minutes;

[0081] B. Descaling: when descaling, the running speed of the rolled piece is 1.4m / s, and the descaling water pressure is 16MPa;

[0082] C. Billet rolling: The billet is roughly rolled by a two-roller reversible billet mill. The billet is first rolled in two passes in a box-shaped pass to reduce the height of the billet. The height is 835mm and the inner width is 435mm. The temperature is 1200°C, the f...

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Abstract

The invention provides wide-flange heavy hot-rolled H-shaped steel, and a production method and application thereof. The wide-flange heavy hot-rolled H-shaped steel comprises the following components: 0.11 to 0.15 percent of C, 0.35 to 0.45 percent of Si, 1.30 to 1.60 percent of Mn, at most 0.015 percent of P, at most 0.015 percent of S, 0.03 to 0.05 percent of V, 0.030 to 0.050 percent of Nb, at most 0.0002 percent of H, at most 0.008 percent of N, 0.010 to 0.015 percent of Alt and the balance of Fe and trace residual elements. In the rough rolling stage, through hole pattern design optimization, the thickness of a web is reserved, metal distribution of the flanges and the web is optimized, more metal is provided for broadening of the flanges, and then the wide-flange heavy hot-rolled H-shaped steel with the flange width greater than or equal to 500 mm and the flange thickness being 80 mm to 140 mm is obtained. The product meets the bearing capacity requirements of high-rise and super high-rise buildings on the hot-rolled H-shaped steel for foundation pit supporting.

Description

technical field [0001] The invention belongs to the technical field of steel rolling production, and in particular relates to a wide-flange heavy-duty hot-rolled H-shaped steel and its production method and application. The product is applied to foundation pit support structures of high-rise super high-rise buildings. Background technique [0002] At present, with the development of large-scale buildings towards high-rise and super-high-rise buildings, the requirements for the bearing capacity of hot-rolled H-shaped steel for foundation pit support are getting higher and higher. In order to avoid damage or collapse of the main structure on the ground, the safety of the building structure is ensured. This requires that the flange width of the hot-rolled H-shaped steel for foundation pit support is also getting wider and wider. [0003] However, there is no hot-rolled H-shaped steel with a flange width ≥ 500mm in the domestic market. This type of hot-rolled H-shaped steel is g...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D1/18C21D6/00C21D8/00E02D17/04B21B1/088B21B37/74
CPCC22C38/02C22C38/04C22C38/12C22C38/06C21D1/18C21D6/005C21D6/008C21D8/005B21B1/088B21B37/74E02D17/04B21B2201/06C21D2211/009C21D2211/005Y02P10/20
Inventor 吴湄庄黄琦吴保桥张卫斌张文满汪杰陈辉何军委沈千成丁朝晖彭林邢军夏勐
Owner MAANSHAN IRON & STEEL CO LTD
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