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High-yield-strength hot-rolled section steel and production process thereof

A production process and high-yield technology, applied in the field of metallurgy, can solve the problems of easy cracks on the surface of continuous casting billets, complex cross-sectional dimensions, affecting product quality, etc., to solve the coexistence of yield strength and plasticity and toughness, and reduce fragmented graphite , the effect of improving hardenability

Inactive Publication Date: 2019-11-26
江苏方圆型钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hot-rolled H-beams are generally rolled with special-shaped billets, and their cross-sectional dimensions are relatively complex. The temperature difference between different regions is large during continuous casting, and cracks are prone to appear on the surface of the continuous casting billet, which seriously affects the quality of the product.

Method used

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  • High-yield-strength hot-rolled section steel and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A high-yield strength hot-rolled H-shaped steel, its chemical composition by weight percentage is: C 0.15wt%, Si0.30wt%, Mn 1.0wt%, P 0.01wt%, S 0.005wt%, Cu 0.3wt%, Cr 0.4wt%, Ni 0.4wt%, Nb 0.03wt%, Ti 0.02wt%, V 0.04wt%, Ce 0.02wt%, Sb 0.03wt%, the rest is iron and trace impurities.

[0030] The production process of hot-rolled H-shaped steel comprises the following steps:

[0031] (1) Melting deoxidation: heat pig iron and / or scrap steel to 1450°C for melting, use Si and Mn for pre-deoxidation alloying in the tapping process, and use silicon-calcium for deep deoxidation alloying;

[0032] (2) Converter smelting: the basicity of the final slag is controlled at 3.0, and the tapping temperature of the converter is 1600°C;

[0033] (3) LF refining: Desulfurization is carried out according to the composition and temperature of the molten steel in the converter. Ce and Sb compounds are added in the later stage of refining to adjust the percentage of Ce and Sb elements. Th...

Embodiment 2

[0039] A high-yield strength hot-rolled H-shaped steel, its chemical composition by weight percentage is: C 0.08wt%, Si0.10wt%, Mn 0.80wt%, P 0.01wt%, S 0.005wt%, Cu 0.3wt%, Cr 0.4wt%, Ni 0.4wt%, Nb 0.03wt%, Ti 0.02wt%, V 0.04wt%, Ce 0.02wt%, Sb 0.03wt%, the rest is iron and trace impurities.

[0040] The production process of hot-rolled H-shaped steel comprises the following steps:

[0041] (1) Melting deoxidation: heat pig iron and / or scrap steel to 1420°C for melting, use Si and Mn for pre-deoxidation alloying in the tapping process, and use silicon-calcium for deep deoxidation alloying;

[0042] (2) Converter smelting: the basicity of the final slag is controlled at 3.0, and the tapping temperature of the converter is 1580°C;

[0043] (3) LF refining: Desulfurization is carried out according to the composition and temperature of molten steel in the converter. Ce and Sb compounds are added in the later stage of refining to adjust the percentage of Ce and Sb elements. The h...

Embodiment 3

[0049]A high-yield strength hot-rolled H-shaped steel, its chemical composition by weight percentage is: C 0.20wt%, Si0.40wt%, Mn 1.25wt%, P 0.01wt%, S 0.005wt%, Cu 0.40wt%, Cr 0.30wt%, Ni0.30wt%, Nb 0.04wt%, Ti 0.03wt%, V 0.02wt%, Ce 0.01wt%, Sb 0.01wt%, the rest is iron and trace impurities.

[0050] The production process of hot-rolled H-shaped steel comprises the following steps:

[0051] (1) Melting deoxidation: heat pig iron and / or scrap steel to 1480°C for melting, use Si and Mn for pre-deoxidation alloying in the tapping process, and use silicon-calcium for deep deoxidation alloying;

[0052] (2) Converter smelting: the basicity of the final slag is controlled at 3.0, and the tapping temperature of the converter is 1650°C;

[0053] (3) LF refining: Desulfurization is carried out according to the composition and temperature of the molten steel in the converter. Ce and Sb compounds are added in the later stage of refining to adjust the percentage of Ce and Sb elements. ...

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Abstract

The invention discloses a high-yield-strength hot-rolled section steel. The chemical components of the hot-rolled section steel include: 0.08-0.20 wt% of C, 0.10-0.40 wt% of Si, 0.80-1.25 wt% of Mn, <= 0.02 wt% of P, <= 0.01 wt% of S, 0.25-0.40 wt% of Cu, 0.30-0.50 wt% of Cr, 0.30-0.50 wt% of Ni, 0.02-0.04 wt% of Nb, 0.01-0.03 wt% of Ti, 0.02%-0.05 wt% of V, 0.01-0.03 wt% of Ce, 0.01-0.05 wt% of Sb and the remainder being Fe and a trace of impurities. The production process of a hot-rolled H-shaped steel includes the following steps: (1) melting and deoxidizing, (2) converter smelting, (3) LFrefining, (4) VD vacuum treatment, (5) the continuous casting of a beam blank, (6) rolling, and (7) cooling to obtain the high-yield-strength hot-rolled H-shaped steel.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a hot-rolled section steel with high yield strength and a production process thereof. Background technique [0002] Hot-rolled section steel is steel obtained by hot-rolling and natural cooling, including partial steel, square steel, angle steel, H-shaped steel, channel steel, screw steel, etc., which are commonly used in various infrastructure constructions. , Mining, petroleum, railway and other industries are widely used. [0003] Weather-resistant H-beams are mostly used in bridges, railways, trucks and other fields. Since hot-rolled H-beams are rolled with passes, not only the deformation is complicated, but also the distribution of deformation between each pass is very limited. Adding a certain amount of alloy to ensure weather resistance while obtaining high yield strength and good low-temperature toughness is a major problem for hot-rolled H-beams. At present, my cou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/46C22C38/48C22C38/50C22C38/60C22C33/06C21C7/10C21C7/064C21D8/00
CPCC21C7/064C21C7/10C21D8/005C22C33/06C22C38/002C22C38/005C22C38/02C22C38/04C22C38/42C22C38/46C22C38/48C22C38/50C22C38/60Y02P10/20
Inventor 徐丹周启玉周宏灵
Owner 江苏方圆型钢有限公司
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