High-strength steel plate Q460GJE-Z35 for extra-thick high-rise building structure and production method thereof

A technology of Q460GJE-Z35 and high-strength steel plate, which is applied to high-strength steel plate Q460GJE-Z35 for extra-thick high-rise building structures and its production field, can solve problems such as difficult production and special requirements for process equipment, and reduce metallurgical costs and reduce The effect of molten steel inclusion content and simple manufacturing process

Inactive Publication Date: 2011-06-01
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Q460GJE-Z35 steel for high-rise buildings with a thickness of more than 100mm cannot be produced due to the difficulty of production and special requirements for process equipment

Method used

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  • High-strength steel plate Q460GJE-Z35 for extra-thick high-rise building structure and production method thereof
  • High-strength steel plate Q460GJE-Z35 for extra-thick high-rise building structure and production method thereof
  • High-strength steel plate Q460GJE-Z35 for extra-thick high-rise building structure and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The process route of the present invention: molten iron KR deep desulfurization→converter smelting→LF refining→VD vacuum treatment→cast ingot pouring→steel ingot heating→phosphorus removal→controlled rolling→controlled cooling→controlled straightening→off-line slow cooling→surface inspection →heat treatment→finishing→flaw detection→testing→judgment→qualified product storage.

[0017] The specific ingredients are shown in Table 1.

[0018] Table 1: Chemical composition / % of Q460GJE-Z35 steel (liquidus temperature 1519°C)

[0019]

Embodiment 2

[0021] The process route of the present invention: molten iron KR deep desulfurization→converter smelting→LF refining→VD vacuum treatment→cast ingot pouring→steel ingot heating→phosphorus removal→controlled rolling→controlled cooling→controlled straightening→off-line slow cooling→surface inspection →heat treatment→finishing→flaw detection→testing→judgment→qualified product storage.

[0022] The specific ingredients are shown in Table 2.

[0023] Table 2: Chemical composition / % of Q460GJE-Z35 steel (liquidus temperature 1519°C)

[0024]

Embodiment 3

[0026] The process route of the present invention: molten iron KR deep desulfurization→converter smelting→LF refining→VD vacuum treatment→cast ingot pouring→steel ingot heating→phosphorus removal→controlled rolling→controlled cooling→controlled straightening→off-line slow cooling→surface inspection →heat treatment→finishing→flaw detection→testing→judgment→qualified product storage.

[0027] The specific ingredients are shown in Table 3.

[0028] Table 3: Chemical Composition / % of Q460GJE-Z35 Steel (Liquidus Temperature 1519°C)

[0029]

[0030] In order to ensure qualified flaw detection, the compression ratio should be at least ≥5. Choose 24T, 26T, 32T, 33T for conventional scale ingots, choose 36-40T for water-cooled mold ingots, and choose 36T water-cooled molds. Design requirements.

[0031] Smelting process, tapping carbon ≥ 0.06%, tapping P ≤ 0.012%, S ≤ 0.012%; the number of spot blowing should not exceed 2 times to avoid slag during tapping. A large amount of sl...

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Abstract

The invention discloses a high-strength steel plate Q460GJE-Z35 for an extra-thick high-rise building structure and a production method thereof. The production method comprises the following steps of KR (Knotted Reactor) desulfurization, transferring to a converter, LF (Ladle Furnace) refining, VD (Vacuum Degassing) vacuum treatment, casting, mold cooling for 8 hours after reaching the steel ingot stripping time, cleaning (completion of cleaning within 8 hours), charging and rolling at the rolling temperature, heating, descaling, rolling through a 3,800mm rolling mill, straightening, cooling in heap, external examination, flaw detection, heat treatment, finishing and warehousing. With a rational component design, molded casting, heating and heat treatment, the yield strength of the obtained product is 440-480MPa; the tensile strength of the obtained product is 540-630MPa; the elongation rate of the obtained product is 24-27%; the impact energy of the obtained product at the temperature of -40 DEG C is 136-208J; the Z-direction properties are distributed between 36 and 57; and the mean value of three Z-direction properties of a single sample is more than 40%. The high-strength steel plate Q460GJE-Z35 for the extra-thick high-rise building structure can reach first-level flaw detection by the non-destructive flaw detection according to the JB/T 4730-2005 standard.

Description

technical field [0001] The invention relates to the technical field of extra-thick steel plates and production methods, in particular to a high-strength steel plate Q460GJE-Z35 for extra-thick high-rise building structures and a production method thereof. technical background [0002] With the rapid development of my country's national economy, the development of steel for high-rise buildings is also developing in the direction of extra thick, extra wide and high performance. Steel for high-rise buildings has higher requirements on the strength and toughness of steel plates, yield ratio, and lamellar tear resistance. Currently, there are not many domestic steel plants that can produce steel plates for high-rise buildings with a thickness of more than 120mm. Q460GJE-Z35 high-rise building steel with a thickness of more than 100mm cannot be produced because of its difficulty in production and special requirements for process equipment. Contents of the invention [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12
Inventor 朱书成许少普张立新崔冠军唐郑磊李红洋康文举杨东徐昭庞林张涛白艺博
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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