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Low-alloy extra-thick steel plate with excellent internal quality, low-temperature impact toughness and lamellar tear resistance produced by compounding two blanks

A technology of low-temperature impact toughness and lamellar tear resistance, which is applied in the field of steel plate manufacturing, can solve the problems that cannot fully meet the needs of industry development, the performance of steel plate flaw detection is not involved, and the production cycle is long, etc., to achieve good lamellar tear resistance. , Ensure the core flaw detection performance, excellent low temperature impact toughness effect

Active Publication Date: 2019-02-12
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its thickness is limited, which cannot meet the requirements of extra-thick steel plates, and the flaw detection performance of steel plates has not been involved.
[0005] The base blank thickness used in the production method of the composite billet extra-thick plate involved in the above-mentioned patent application is relatively small, and three billets are used for compounding, which is difficult to produce, high in cost, and long in production cycle. The steel plate cannot meet the requirements of high-level flaw detection and low-temperature impact toughness at the same time. , cannot fully meet the needs of industry development

Method used

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  • Low-alloy extra-thick steel plate with excellent internal quality, low-temperature impact toughness and lamellar tear resistance produced by compounding two blanks

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The thickness of the steel plate in this embodiment is 400mm, and its chemical composition is calculated by weight percentage: C: 0.12%, Si: 0.25%, Mn: 1.50%, P: 0.005%, S: 0.0005%, Al: 0.030%, Nb: 0.032%, V: 032%, Ti: 0.012%, Ni: 0.25%, Cu: 0.03%, H: 0.00010%, O: 0.0008%, N: 0.0030%, Pb: 0.0011%, Sn: 0.0022%, As: 0.0030%, Sb: 0.0012%, Bi: 0.003%, and the balance is Fe and unavoidable impurity elements.

[0035] The manufacturing process of the steel plate is as follows:

[0036] Production process: steelmaking→continuous casting→base billet compounding→composite billet heating→compound billet rolling→steel plate slow cooling→steel plate flaw detection→steel plate normalizing→finishing→inspection→storage.

[0037] The specific operation of the main process is as follows:

[0038] Base billet steelmaking and continuous casting processes mainly reduce S, P, H, O and N elements in steel through KR molten iron pretreatment, slag removal treatment after converter smelting, R...

Embodiment 2

[0046] The thickness of the steel plate in this embodiment is 200mm, and its chemical composition is calculated by weight percentage: C: 0.12%, Si: 0.26%, Mn: 1.52%, P: 0.004%, S: 0.0006%, Al: 0.032%, Nb: 0.038%, V: 035%, Ti: 0.014%, Ni: 0.22%, Cu: 0.06%, H: 0.00007%, O: 0.0006%, N: 0.0038%, Pb: 0.0003%, Sn: 0.0025%, As: 0.0052%, Sb: 0.0025%, Bi: 0.0012%, the balance is Fe and unavoidable impurity elements.

[0047] The manufacturing process of the steel plate is as follows:

[0048] Production process: steelmaking→continuous casting→base billet compounding→composite billet heating→compound billet rolling→steel plate slow cooling→steel plate flaw detection→steel plate normalizing→finishing→inspection→storage.

[0049] The specific operation of the main process is as follows:

[0050] Base billet steelmaking and continuous casting processes mainly reduce S, P, H, O and N elements in steel through KR molten iron pretreatment, slag removal treatment after converter smelting, RH...

Embodiment 3

[0058] The thickness of the steel plate in this embodiment is 320mm, and its chemical composition is calculated by weight percentage: C: 0.12%, Si: 0.25%, Mn: 1.55%, P: 0.005%, S: 0.0006%, Al: 0.033%, Nb: 0.032%, V: 036%, Ti: 0.015%, Ni: 0.27%, Cu: 0.05%, H: 0.00005%, O: 0.0008%, N: 0.0035%, Pb: 0.0002%, Sn: 0.0022%, As: 0.0035%, Sb: 0.0020%, Bi: 0.0010%, the balance is Fe and unavoidable impurity elements.

[0059] The manufacturing process of the steel plate is as follows:

[0060] Production process: steelmaking→continuous casting→base billet compounding→composite billet heating→compound billet rolling→steel plate slow cooling→steel plate flaw detection→steel plate normalizing→finishing→inspection→storage.

[0061] The specific operation of the main process is as follows:

[0062] Base billet steelmaking and continuous casting processes mainly reduce S, P, H, O and N elements in steel through KR molten iron pretreatment, slag removal treatment after converter smelting, RH...

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Abstract

The invention relates to a low alloy extremely-thick steel plate having the excellent interior quality, low-temperature impact toughness and lamination crackresistant property. A fracture surface continuous casting plate blank of 370 or 450 mm is adopted to serve as a base blank to be subjected to two-blank composition through electronic beam welding in a vacuum chamber, and the thickness of composite blanks are 710-720 mm and 870-880 mm correspondingly; and the composite blanks are taken as blank materials to produce the low alloy extremely-thick steel plate with the steel plate thickness being larger than 150-400 mm through work procedures of heating, rolling and normalizing. The steel plate has the good interior quality and excellent mechanical performance, flaw detection can meet the standard levels such as I levels of EN10160 S2E3, A578C, GB / T2970, the thickness-direction performance can meet Z35, and low-temperature impacting of minus 40 DEG C can meet the unit value being larger than or equal to 100 J.

Description

technical field [0001] The invention belongs to the field of steel plate manufacturing, and in particular relates to a low-alloy extra-thick steel plate with a maximum thickness of 400 mm produced by compounding two billets and a manufacturing method thereof. Background technique [0002] With the rapid development of economic construction and the need for large-scale equipment, the demand for low-alloy extra-thick steel plates is increasing year by year. At the same time, design units have put forward higher and higher requirements for the internal quality and mechanical properties of extra-thick steel plates. The greater the thickness of the steel plate, the more serious the metallurgical defects such as internal porosity and segregation, which lead to the failure of the steel plate to meet the needs of industry development in terms of flaw detection performance, low temperature impact performance and lamellar tear resistance. At present, the maximum thickness of domestic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/60C22C33/04B21C37/02C21D8/02
CPCB21C37/02C21D8/0205C21D8/0221C21D8/0247C22C33/04C22C38/002C22C38/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/60
Inventor 刘海宽高助忠胡建国李经涛阳日隆张建张军恽鹏程徐伟孟宪震
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD