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Small-compression-ratio thick controlled rolling Q345GJ steel plate for building structure and production method thereof

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

Active Publication Date: 2020-11-20
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 controlled rolling Q345GJ steel plate for building structure and production method thereof
  • Small-compression-ratio thick controlled rolling Q345GJ steel plate for building structure and production method thereof
  • Small-compression-ratio thick controlled rolling Q345GJ steel plate for building structure and production method thereof

Examples

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 small-compression-ratio thick controlled rolling Q345GJ steel plate for a building structure. The steel plate is characterized in that the thickness of the steel plate is 60-80 mm; the steel plate comprises chemical components: by mass, 0.13-0.17% of C, 0.20-0.40% of Si, 1.20-1.40% of Mn, less than or equal to 0.018% of P, less than or equal to 0.007% of S, 0.015-0.045% of Als, 0.015-0.030% of Nb, 0.008-0.020% of Ti, and the balance Fe and inevitable impurities; and moreover, the steel plate meets the requirement for the carbon equivalent CEV less than or equal to 0.40%. The invention further discloses a production of the steel plate. Through the moderate carbon content and carbon equivalent, a controlled rolling an controlled cooling method and especially, a characteristic water cooling process, uniform matched strength and toughness of the super-thick steel plate of 60-80 mm in the thickness direction is realized, the requirements for the performance, the yield ratio, the flaw detection performance and the like of the steel plate in the Z35 thickness direction are met, the technological process is simplified, the manufacturing period is shortened, and the welding performance is improved.

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 Applications(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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