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Low-alloy high-strength structure steel hot-rolled H-shaped steel and production method thereof

A low-alloy high-strength, production method technology, applied in the direction of temperature control, etc., to achieve the effect of reducing the difficulty of production technology, simple component design, and improving low-temperature impact toughness

Inactive Publication Date: 2019-01-18
SHOUGANG CHANGZHI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the existing production technology, provide a low-alloy high-strength structural steel hot-rolled H-shaped steel and its production method, in order to solve the protective casting technology that exists in the small-section special-shaped billet casting production of this steel type problem, to reduce the difficulty of production technology and improve the technical effect of smooth production

Method used

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  • Low-alloy high-strength structure steel hot-rolled H-shaped steel and production method thereof
  • Low-alloy high-strength structure steel hot-rolled H-shaped steel and production method thereof

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Embodiment 1

[0027] According to the steel composition requirements of the present invention, smelting in an 80t top-blown converter, refining in an LF ladle refining furnace, and using a continuous casting semi-protective casting process, the finished steel with the chemical composition described in Table 1 is obtained, and the section steel is rolled H300×150×6.5 ×9 specifications, the process parameters are shown in Table 6, and the mechanical properties are shown in Table 7.

[0028] The chemical composition (wt%) of table 1 embodiment 1 steel

[0029] C

Embodiment 2

[0031] According to the requirement of steel composition of the present invention, adopt 80t top-blowing converter to smelt, refine through LF ladle refining furnace, adopt continuous casting semi-protective casting process, obtain the finished steel with chemical composition as shown in the following table 2, section steel rolling H250×250×9 ×14 specifications, the process parameters are shown in Table 6, and the mechanical properties are shown in Table 7.

[0032] Chemical composition (wt%) of steel of table 2 embodiment 2

[0033] C

Embodiment 3

[0035] According to the composition requirements of the steel of the present invention, smelting in an 80t top-blown converter, refining in an LF ladle refining furnace, and using a continuous casting semi-protective casting process, the finished steel with the chemical composition as shown in Table 3 is obtained, and the section steel is rolled H450 × 150 × 6 ×9 specifications, rolling H-beam specifications, the process parameters are shown in Table 6, and the mechanical properties are shown in Table 7.

[0036] Chemical composition (wt%) of table 3 embodiment 3 steel

[0037] C

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Abstract

The invention relates to the technical field of the production of a metal material, in particular to low-alloy high-strength structure steel hot-rolled H-shaped steel and a production method thereof.The steel is prepared from the following chemical components by in percentage by weight: 0.12 to 0.18 percent of C, 0.30 to 0.50 percent of Si, 1.20 to 1.60 percent of Mn, 0.020 to 0.065 percent of V,0.006 to 0.012 percent of Als, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, and the balance of Fe and micro impurities. The production method comprises the following steps: smelting in a converter, LF refining, pouring a specially-shaped blank under a semi-protection condition, and rolling the H-shaped steel. In the production process of the hot-rolled H-shaped steel, the rolling temperature of the H-shaped steel is controlled, specifically, the heating temperature of a heating furnace is controlled, the rolling temperature of a blank opening machine iscontrolled, and the rolling temperature of a universal rolling machine is controlled. The yield strength of the low-alloy high-strength structure hot-rolled H-shaped steel produced in the invention can reach 420 MPa by designing chemical components and controlling the rolling process, the elongation percentage is 19 percent and above, and the hot-rolled H-shaped steel is good in low-temperature impact toughness.

Description

technical field [0001] The invention relates to the technical field of metal material production, in particular to a low-alloy high-strength structural steel hot-rolled H-shaped steel and a production method thereof. Background technique [0002] Low-alloy high-strength structural steel hot-rolled H-shaped steel generally adopts converter, refining, profiled billet continuous casting, and rolling production processes. Its quality grades are regulated in GB / T1591 low-alloy high-strength structural steel, among which C, D, E grades In the production of steel, Al is used as one of the main alloying elements, and the fine-grained elements Nb, V, and Ti are used as control elements, and the element control requirements are ① Als is not less than 0.015%; ② When the combination of fine-grained elements is added, 20 (Nb+V+Ti)≤0.22%. [0003] Chinese invention patent: publication number CN104831154A, H-shaped steel and its production method. The invention patent relates to an H-sha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/06C21D8/00B21B37/74
CPCB21B37/74C21D8/005C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 丁建国周剑波苗国平孟义春李宁韩北方赵攀峰燕建宏胡洪徐兵伟
Owner SHOUGANG CHANGZHI IRON & STEEL
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