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Small compression ratio thick specification controlled rolling type q345gje steel plate for building structure and its production method

A Q345GJE and building structure technology, applied in the field of high-quality steel product manufacturing, can solve the problems of long manufacturing cycle, poor weldability, high alloy content, etc., and achieve the effects of shortening the manufacturing cycle, improving welding performance, and simplifying the process

Active Publication Date: 2021-09-21
TIANJIN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High alloy content, long manufacturing cycle and high production cost
Poor weldability due to higher carbon equivalent

Method used

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  • Small compression ratio thick specification controlled rolling type q345gje steel plate for building structure and its production method
  • Small compression ratio thick specification controlled rolling type q345gje steel plate for building structure and its production method
  • Small compression ratio thick specification controlled rolling type q345gje steel plate for building structure and its production method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] According to the scope of the chemical composition provided by the present invention, according to the above process flow and the specified process conditions, molten steel is smelted on a 120t converter, and the molten steel is cast into a 250mm thick slab, and after slow cooling and reheating, it is rolled on a 3500mm wide and thick plate rolling mill 60mm steel plate.

[0045] The chemical composition of the steel plate is: C 0.15%, Si 0.28%, Mn 1.34%, P 0.015%, S 0.004%, Als 0.032%, Nb 0.021%, Ti 0.016%, CEV 0.37%.

[0046] The heating, rolling, and normalizing processes are as follows: the furnace temperature is 1150°C, the rough rolling intermediate billet thickness is 110mm, the finishing rolling start temperature is 818°C, the final rolling temperature is 812°C; the water inlet temperature is 772°C, 20 sets of cooling water are turned on, The channel speed is 45m / min, the outlet water temperature is 589°C, and the red return temperature is 625°C.

[0047] The p...

Embodiment 2

[0053] The technological process of the present invention is: blast furnace molten iron→pre-desulfurization of molten iron→converter smelting→deoxidation alloying→LF refining→VD refining→slab continuous casting→slab off-line stacking and slow cooling→slab cleaning→slab reheating→ 3500 rolling mill rolling → laminar cooling → steel plate stacking slow cooling → finished product sampling inspection → storage.

[0054] According to the scope of the chemical composition provided by the present invention, according to the above process flow and the specified process conditions, the molten steel is smelted on a 120t converter, the molten steel is cast into a 250mm thick slab, and after reheating, an 80mm steel plate is rolled on a 3500mm wide and thick plate rolling mill .

[0055] The chemical composition of the steel plate is: C 0.15%, Si 0.34%, Mn 1.35%, P 0.014%, S 0.003%, Als 0.038%, Nb 0.024%, Ti 0.018%, CEV 0.375%.

[0056] The heating, rolling, and normalizing processes are...

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Abstract

The invention discloses a Q345GJE steel plate for building structures with a small compression ratio and thick specifications controlled rolling, which is characterized in that the thickness of the steel plate is [60,80] mm, and the mass percentage of the chemical composition of the steel plate is: C: 0.13-0.17%, Si : 0.20~0.40%, Mn: 1.20~1.40%, P≤0.018%, S≤0.007%, Als: 0.015~0.045%, Nb: 0.015~0.030%, Ti: 0.008~0.020%, the balance is Fe and not Avoid impurities, and meet the carbon equivalent CEV ≤ 0.40%. The invention also discloses a production method of the above-mentioned steel plate. The invention adopts moderate carbon content and carbon equivalent, adopts the method of controlled rolling and controlled cooling, especially adopts a characteristic water cooling process, so that the extra-thick steel plate of 60-80mm can realize The uniform strength and toughness matching in the thickness direction not only ensures the Z35 thickness direction performance, yield strength ratio, flaw detection performance and other requirements of the steel plate, but also simplifies the process flow, shortens the manufacturing cycle, and improves the welding performance.

Description

technical field [0001] The invention belongs to the field of manufacturing high-quality iron and steel products, and in particular relates to a steel plate for building structures with a small compression ratio and a production method thereof. Background technique [0002] With the continuous improvement of my country's steel supply and technology and quality levels, the materials used in buildings are changing from concrete to steel structures. Compared with concrete, steel structure has a series of advantages such as light weight, large span, short construction period, prefabrication in factories, and convenient recycling. my country's high-rise buildings, long-span convention and exhibition centers, railway stations, industrial plants and other buildings use more and more steel structures, and the thickness of the steel plates used is also increasing, and the technical requirements for steel plates are also getting higher and higher. [0003] For medium and thick plate p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C33/04C21D8/02
CPCC21D8/0226C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 徐洪庆孟宪成楚志宝付鹏冲王佩鑫
Owner TIANJIN IRON & STEEL GRP
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