Low-alloy extra-thick structure steel plate with the thickness being 400-610 mm and manufacturing method thereof

A structural steel plate, low alloy technology, applied in the field of steel plate manufacturing, can solve the problems of not fully meeting the needs of the industry development, not mentioning the flaw detection performance of the steel plate, and the thickness of the base blank and the steel plate being small.

Active Publication Date: 2017-09-19
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The flaw detection performance of the steel plate is not mentioned, and the thickness of the base blank and the steel plate is small, which cannot fully meet the needs of industry development

Method used

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  • Low-alloy extra-thick structure steel plate with the thickness being 400-610 mm and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The thickness of the steel plate in this embodiment is 450mm, and its chemical composition is calculated by weight percentage: C: 0.12%, Si: 0.22%, Mn: 1.52%, P: 0.006%, S: 0.0008%, Al: 0.032%, Nb: 0.035%, V: 028%, Ti: 0.015%, Ni: 0.22%, Cu: 0.05%, H: 0.00010%, O: 0.0009%, N: 0.0032%, Pb: 0.0012%, Sn: 0.0025%, As: 0.0035%, Sb: 0.0015%, Bi: 0.002%, 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, RH ...

Embodiment 2

[0046] The thickness of the steel plate in this embodiment is 500mm, and its chemical composition is calculated by weight percentage: C: 0.13%, Si: 0.24%, Mn: 1.55%, P: 0.005%, S: 0.0005%, Al: 0.034%, Nb: 0.040%, V: 032%, Ti: 0.016%, Ni: 0.21%, Cu: 0.10%, H: 0.00008%, O: 0.0008%, N: 0.0036%, Pb: 0.0002%, Sn: 0.0030%, As: 0.0050%, Sb: 0.0020%, Bi: 0.0010%, 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 610mm, and its chemical composition is calculated by weight percentage: C: 0.14%, Si: 0.20%, Mn: 1.55%, P: 0.006%, S: 0.0005%, Al: 0.030%, Nb: 0.035%, V: 035%, Ti: 0.018%, Ni: 0.23%, Cu: 0.06%, H: 0.00006%, O: 0.0008%, N: 0.0032%, Pb: 0.0001%, Sn: 0.0020%, As: 0.0030%, Sb: 0.0022%, Bi: 0.0012%, and 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...

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Abstract

The invention relates to a low-alloy extra-thick structure steel plate with the thickness being 400-610 mm. Chemical components of the steel plate is redesigned; the contents of elements of S,P,H,O and N are controlled to improve the purity degree of liquid steel; the low-temperature impact toughness of the extra-thick steel plate is improved; the oxygen content is decreased, and by combining the hot rolling process, the content of oxides in steel is effectively decreased; and the favorable condition is created for achieving metallic bonding of a composite interface. Three continuous casting slab with the 370 mm sections are used as base slabs and composited; the thickness of a composite slab is 1050-1090 mm; the composite slab serves as a slab material, and production is conducted through processes of heating, rolling and normalizing; the steel plate has the good internal quality and excellent mechanical property; flaw detection can meet the standard levels of EN10160 S1E1, A578B, A435 and the like; thickness directional performance can meet Z35; and low-temperature impact at -20 DEG C can meet the requirement that the single value is larger than or equal to 100J.

Description

technical field [0001] The invention belongs to the field of steel plate manufacturing, and in particular relates to a low-alloy extra-thick structural steel plate with a thickness of 400-610 mm and a manufacturing method thereof. Background technique [0002] With the rapid development of the machinery manufacturing industry and the need for large-scale equipment, the demand for low-alloy extra-thick steel plates is increasing year by year, and it is developing in the direction of large unit weight and high performance. 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 blanks used in the production of extra-thick steel plates with a thickness of more than 400mm mainly include forging bille...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C38/14C22C38/12C22C38/08C22C38/06C22C38/04C22C38/02C22C38/60C22C33/04B21C37/02
CPCB21C37/02C22C33/04C22C38/002C22C38/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/60
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
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