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A kind of high-strength building steel plate and its production method

A high-strength technology for construction, applied in the field of construction steel, can solve the problems of low impact toughness, insufficient yield strength ratio and low temperature toughness, and achieve the effect of improving steel mechanical properties, good yield strength ratio and excellent mechanical properties

Active Publication Date: 2016-08-24
溧阳市万兴特种建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of steel is generally delivered in a quenched and tempered state, and its impact toughness is low
Some domestic steel enterprises are developing high-performance construction steel varieties, but the current trial-produced products are still insufficient in terms of yield strength ratio and low temperature toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The composition of the high-strength steel plate for construction of the present invention is designed to be: C: 0.10%, Si: 0.25%, Mn: 1.40%, Ni: 0.04%, Ti: 0.005%, Cu: 0.35%, S: 0.004 %, P: 0.01%, Alt: 0.03%, Nb: 0.03%, V: 0.03%, the balance is Fe and unavoidable impurities; its yield strength: 500MPa, tensile strength: 650MPa, elongation: 25%, Yield ratio: 0.40.

[0028] The preparation method of the high-strength construction steel of the present invention includes the following steps: blast furnace molten iron→desulfurization pretreatment→converter smelting→LF refining→RH refining→slab continuous casting→slab inspection→slab cleaning→slab heating→scaling removal →Rolling→Rapid cooling→Flaw detection→Tempering→Cutting, sampling→Spray printing label→Storage; After desulfurization treatment of molten iron, the sulfur content is controlled at S: 0.0010%, converter control P: 0.005%, LF for desulfurization, deoxidation and alloy composition Adjustment, RH vacuum treatme...

Embodiment 2

[0030] The composition of the high-strength steel plate for construction of the present invention is designed to be: C: 0.14%, Si: 0.30%, Mn: 1.5%, Ni: 0.05%, Ti: 0.01%, Cu: 0.50%, S: 0.003 %, P: 0.005%, Alt: 0.05%, Nb: 0.04%, V: 0.04%, the balance is Fe and unavoidable impurities; its yield strength: 550MPa, tensile strength: 650MPa, elongation: 30%, Yield ratio: 0.30.

[0031] The preparation method of the high-strength steel plate for construction of the present invention comprises the following steps: blast furnace molten iron → desulfurization pretreatment → converter smelting → LF refining → RH refining → slab continuous casting → slab inspection → casting slab cleaning → slab heating → descaling →Rolling→Rapid cooling→Flaw detection→Tempering→Cutting, sampling→Spray printing logo→Storage; The sulfur content of the molten iron after desulfurization treatment is controlled at S: 0.0009%, converter control P: 0.004%, LF desulfurization and deoxidation and Alloy composition ...

Embodiment 3

[0033] The composition of the high-strength steel plate for construction of the present invention is designed to be: C: 0.15%, Si: 0.45%, Mn: 1.60%, Ni: 0.06%, Ti: 0.02%, Cu: 0.60%, S: 0.002 %, P: 0.003%, Alt: 0.06%, Nb: 0.05%, V: 0.05%, the balance is Fe and unavoidable impurities; the balance is Fe and unavoidable impurities; its yield strength: 600MPa, tensile Strength: 690MPa, elongation: 35%, yield ratio: 0.20.

[0034] The preparation method of the high-strength steel plate for construction of the present invention comprises the following steps: blast furnace molten iron → desulfurization pretreatment → converter smelting → LF refining → RH refining → slab continuous casting → slab inspection → casting slab cleaning → slab heating → descaling →Rolling→Rapid cooling→Flaw detection→Tempering→Cutting, sampling→Spray printing logo→Storage; After desulfurization treatment of molten iron, the sulfur content is controlled at S: 0.0008%, converter control P: 0.003%, LF for desul...

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Abstract

The invention discloses a high-strength steel plate for construction. The composition is designed as: C: 0.10-0.15%, Si: 0.25-0.45%, Mn: 1.40-1.60%, Ni: 0.04-0.06%, Ti : 0.005~0.02%, Cu: 0.35~0.60%, S≤0.004%, P≤0.01%, Alt: 0.03~0.06%, Nb: 0.03~0.05%, V: 0.03~0.05%, the balance is Fe and not available Avoided impurities; its yield strength ≥ 500MPa, tensile strength ≥ 650MPa, elongation ≥ 25%, yield ratio ≤ 0.40; the invention solves the problems of insufficient yield ratio and low temperature toughness of existing construction steel.

Description

technical field [0001] The invention relates to a construction steel, especially a high-strength construction steel and a preparation method thereof. Background technique [0002] my country's building construction is developing in the direction of high speed, heavy load, large span, fully welded joints, and high safety. The yield strength range of the currently used construction steel is generally 245-420MPa, and foreign countries have also developed and used high-performance construction steel varieties. For example, the United States uses high-performance construction steel, and has built many high-performance steel bridges. However, this kind of steel is generally delivered in a quenched and tempered state, and its impact toughness is low. Some domestic steel enterprises are developing high-performance construction steel varieties, but the current trial-produced products are still insufficient in terms of yield strength ratio and low temperature toughness. Contents o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C21D8/02C21C7/064C21C7/10
CPCC21C7/064C21C7/10C21D8/0205C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16
Inventor 姚圣法吴海洋
Owner 溧阳市万兴特种建材有限公司
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