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Thick armor plate with high tension and method for manufacturing the same

A manufacturing method and technology for thick steel plates are applied in the field of thick steel plates to achieve the effects of increasing uniform elongation, reducing fracture area and preventing fracture openings

Inactive Publication Date: 2008-02-27
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, according to the methods described in Patent Document 3 and Patent Document 4, only about 15% of the uniform elongation can be obtained, and further improvement of the uniform elongation is required in order to adapt to ships.

Method used

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  • Thick armor plate with high tension and method for manufacturing the same
  • Thick armor plate with high tension and method for manufacturing the same
  • Thick armor plate with high tension and method for manufacturing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0105] The steel obtained by smelting in a small vacuum furnace and having the composition shown in Table 1 below (the balance is Fe and unavoidable impurities) was heated at 1100° C. for 30 minutes to form an austenite single phase, and then hot rolled. The final rolling temperature was 800°C, and the final plate thickness was 12.5 mm.

[0106] The obtained hot-rolled material was cooled under the conditions shown in Table 2 below using water cooling equipment and a heat treatment furnace. In Table 2, T1 to T4, t1 to t2, and R1 to R3 correspond to the numbers attached to the aforementioned FIG. 1 .

[0107] After cooling to the slow cooling end temperature T4, it was air-cooled to room temperature, and a thick steel plate (thickness 12.5 mm) was produced.

[0108] Measure the microstructure [ferrite fraction, residual γ fraction, C content in residual γ] and base metal properties [yield point (YP), tensile strength (TS)] of the obtained thick steel plate according to the fol...

Embodiment 2

[0138] The steel obtained by smelting in a small vacuum furnace with the composition shown in the following Table 5 or Table 6 (the balance is Fe and unavoidable impurities) was heated at 1100° C. for 30 minutes to form an austenite single phase and then hot rolled. The final rolling temperature was 800°C, and the final plate thickness was 12.5 mm. In the following Table 5 or Table 6, use the following formula (1) to calculate the value of “[N]-0.292×[Ti]” according to the composition of the steel, and “(14 / 10.8)×([B]-0.0003 )" and display the value.

[0139] The obtained hot-rolled material was cooled under the conditions shown in Table 7 below using water cooling equipment and a heat treatment furnace. In Table 7, T1 to T4, t1 to t2, and R1 to R3 correspond to the numbers attached to the aforementioned FIG. 1 .

[0140] After cooling to the slow cooling end temperature T4, it was air-cooled to room temperature, and a thick steel plate (thickness 12.5 mm) was produced.

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Abstract

A high-tension heavy steel plate is characterized in that the heavy steel plate comprises the following components by mass %: C: 0.02 to 0.20%, Si: 0.2 to 0.5%, Mn: 1 to 1.8%, Cu and / or Ni: add up to 0.2 to 1%, the allowance is Fe and inevitable impurity, besides, the ferrite piece-rate: above 80% by volume, the residual austenite piece-rate: above 1% by volume, besides the C quantity in the residual austenite is from 0.80 to 1.10% by volume.

Description

technical field [0001] The present invention relates to a thick steel plate used for large structures such as ships and a method of manufacturing the same, and more particularly to a thick steel plate with a strength of 490 MPa or more and less than 590 MPa (hereinafter referred to as 490 MPa grade) and a thickness of about 5 mm or more. Background technique [0002] If ships collide with each other or run aground, the ship will break and open, water will seep and sink, and cargo and fuel will flow out of the ship, causing marine pollution, which has become a social problem. Therefore, various steel plates for ship hulls have been proposed which can absorb the impact energy received by the ship hull and prevent the disadvantages caused by the destruction of the ship hull when ships collide with each other or when the ship runs aground. [0003] As a steel plate for ship hulls excellent in such impact absorbing performance, Patent Document 1 proposes a steel plate that contai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C38/08C22C38/14C22C38/12C22C38/20C22C38/40C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C21D9/46C21D11/00
Inventor 村上俊夫冈崎喜臣田村荣一
Owner KOBE STEEL LTD
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