Production method of high-transverse/longitudinal-impact-ratio high-thickness Q690E high-strength steel

A technology of Q690E and production method, which is applied in the field of iron and steel, can solve the problems of long and unsuitable slow cooling process, and achieve the effect of short production process and low cost

Active Publication Date: 2017-01-04
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The publication number is: CN201410467565.0 - an extra-thick Q690 high-strength structural steel plate and its manufacturing method. It adopts reasonable composition design and obtains reasonable performance through online DQ+slow cooling+tempering process. The chemical composition in the method adds precious alloys such as 0.89% Ni+0.57% Mo, and the slow cooling process is particularly long, which is not suitable for large-scale production, and the 160mm-180mm impact quality grade only reaches 0°C, which is the C level. And the impact energy value is below 70J

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  • Production method of high-transverse/longitudinal-impact-ratio high-thickness Q690E high-strength steel
  • Production method of high-transverse/longitudinal-impact-ratio high-thickness Q690E high-strength steel
  • Production method of high-transverse/longitudinal-impact-ratio high-thickness Q690E high-strength steel

Examples

Experimental program
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Effect test

Embodiment 1

[0027] This example provides a method for producing high-strength Q690E high-strength steel with high transverse and longitudinal impact ratio and large thickness. The production method includes the following process:

[0028] Hot metal desulfurization pretreatment→converter smelting→LF+RH refining→continuous casting→slab stacking and slow cooling→slab inspection→slab judgment→slab acceptance→slab heating→descale→rolling→air cooling→flaw detection→throwing Shot→quenching→tempering→straightening→cutting, sampling→printing mark→inspection→warehousing, of which:

[0029](1) The chemical composition of the high-strength steel includes, by weight percentage, C: 0.17%, Si: 0.25%, Mn: 1.1%, P≤0.015%, S≤0.002%, Cu≤0.1%, Cr: 0.37%, Ni: 0.41%, Mo: 0.42%, Nb: 0.011%, Ti: 0.017%, V: 0.032%, B: 0.0013%, Alt: 0.026%, Ceq: 0.54%, the balance is Fe and unavoidable impurities, The carbon equivalent Ceq (percentage) in the chemical composition of this high-strength steel is calculated accordin...

Embodiment 2

[0039] This example provides a method for producing high-strength Q690E high-strength steel with high transverse and longitudinal impact ratio and large thickness. The production method includes the following process:

[0040] Hot metal desulfurization pretreatment→converter smelting→LF+RH refining→continuous casting→slab stacking and slow cooling→slab inspection→slab judgment→slab acceptance→slab heating→descale→rolling→air cooling→flaw detection→throwing Shot→quenching→tempering→straightening→cutting, sampling→printing mark→inspection→warehousing, of which:

[0041] (1) The chemical composition of the high-strength steel includes, by weight percentage, C: 0.15%, Si: 0.23%, Mn: 1.17%, P≤0.010%, S≤0.0010%, Cr: 0.3%, Cu≤0.1%, Ni: 0.45%, Mo: 0.45%, Nb: 0.014%, Ti: 0.013%, V: 0.034%, B: 0.0015%, Alt: 0.033%, Ceq: 0.53%, the balance is Fe and unavoidable impurities;

[0042] (2) Select a slab with a thickness of 320mm and heat the slab. The temperature in the heating section is 1...

Embodiment 3

[0049] This example provides a method for producing high-strength Q690E high-strength steel with high transverse and longitudinal impact ratio and large thickness. The production method includes the following process:

[0050] Hot metal desulfurization pretreatment→converter smelting→LF+RH refining→continuous casting→slab stacking and slow cooling→slab inspection→slab judgment→slab acceptance→slab heating→descale→rolling→air cooling→flaw detection→throwing Shot→quenching→tempering→straightening→cutting, sampling→printing mark→inspection→warehousing, of which:

[0051] (1) The chemical composition of the high-strength steel includes, by weight percentage, C: 0.18%, Si: 0.28%, Mn: 1.15%, P≤0.015%, S≤0.002%, Cr: 0.48%, Cu≤0.1%, Ni: 0.48%, Mo: 0.49%, Nb: 0.018%, Ti: 0.011%, V: 0.038%, B: 0.0011%, Alt: 0.044%, Ceq: 0.60%, the balance is Fe and unavoidable impurities, The carbon equivalent Ceq (percentage) in the chemical composition of this high-strength steel is calculated accord...

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Abstract

The invention discloses a production method of high-transverse/longitudinal-impact-ratio high-thickness Q690E high-strength steel. The production method comprises the following procedures: molten iron desulfurization pretreatment; converter smelting; LF and RH refining; continuous casting; casting blank piling and slow cooling; casting blank inspection; casting blank judgment; casting blank acceptance check; casting blank heating; descaling; rolling; air cooling; flaw detection; shot blasting; quenching; tempering; straightening; cutting and sampling; identifier spray printing; inspection; and warehousing. According to the invention, the production method has short production work procedures and low cost; and the produced steel is favorable in mechanical property, high in strength, high in toughness, high in plasticity, high in transverse/longitudinal impact work value and stable in weldability.

Description

technical field [0001] The invention relates to a production method of Q690E high-strength steel, in particular to a production method of Q690E high-strength steel with high horizontal and vertical impact ratio and large thickness, belonging to the technical field of iron and steel. Background technique [0002] High-strength steel is a resource-saving product with high technical content and high added value. For large buildings, especially high-rise buildings, in order to ensure the overall safety of high-rise buildings, structural parts are required not only to have high strength and welding It also has high transverse and longitudinal impact toughness and excellent wear resistance. With the vigorous development of domestic large-scale projects, high-strength steels of Q690E and above grades are widely used in construction machinery, mining, cranes, offshore platforms, etc. It has been vigorously applied, and its characteristics are: simple structure, light weight, high sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C21D8/02
CPCC21D8/0226C21D8/0247C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C22C38/32
Inventor 郑建平姜在伟姜金星王新陈林恒闫强军张仪杰王思聪
Owner NANJING IRON & STEEL CO LTD
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