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Production method of low-cost and high-performance structural steel

A technology for structural steel and production methods, which is applied in the manufacture of converters, etc., can solve problems such as poor processability, uneven hardness, and low strength, and achieve the effects of improving mechanical properties, improving processing performance, and high carbon content

Inactive Publication Date: 2019-02-15
NINGBO IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a production method of low-cost high-performance structural steel, which solves the problems of poor processability, low strength, uneven hardness, and soft spots that are easy to occur in ordinary low-alloy steel. question

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  • Production method of low-cost and high-performance structural steel
  • Production method of low-cost and high-performance structural steel
  • Production method of low-cost and high-performance structural steel

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Embodiment 1

[0026] (1) Composition design

[0027] The design chemical composition of Q345B-JG steel is:, C: 0.14~0.19%, Si: 0.05~0.25%, Mn: 0.90~1.30%, P≤0.025%, S≤0.008%, Als: 0.010~0.060%, Nb : 0.007~0.018%, the balance is Fe and unavoidable impurities.

[0028] The production process is as follows: desulfurization of molten iron, converter blowing, LF and AR refining, continuous casting, hot direct loading, soaking, rough rolling, finish rolling, laminar cooling, coiling, and cooling to the factory.

[0029] (2) Smelting technology

[0030] Desulfurization of molten iron to [S]≤0.008%;

[0031] Bottom blowing in converter smelting adopts nitrogen-argon switching; tapping slag and steel tapping, strictly controlling the amount of slag in the converter; tapping alloying with addition of Si, Mn alloys and recarburizers; ladle bottom blowing of argon is required to be good;

[0032] The continuous casting adopts full protection casting; the liquidus temperature TL=1514°C, and the targe...

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Abstract

The invention relates to a production method of a low-cost and high-performance structural steel. The method comprises the following steps: (1) designing components; and (2) performing molten iron desulphurization, bessemerizing, LF and AR refining, continuous casting, thermal direct filling, soaking, rough rolling, fine rolling, laminar cooling, coiling, cooling, and leaving a factory to obtain the steel. According to the method, the problems such as low strength, non-uniform hardness and low bending performance of rolled medium carbon steel can be avoided; the processing performance is improved; the uniformity of the surface hardness and the general coiling performance is improved; the elongation is high, so that the toughness is improved; the yield ratio is low, so that the processing efficiency is improved; and meanwhile, the vibration resistance is improved; and the method has a good application prospect.

Description

technical field [0001] The invention belongs to the field of high-strength structural steel, in particular to a production method of low-cost high-performance structural steel. Background technique [0002] Domestically produced high-strength structural steel materials are mainly used in the fields of high-rise building structural materials, mechanical high-elastic materials, petroleum, and automobile structures, and their production volume has gradually increased in recent years. The monthly output of Ninggang is nearly 20,000 tons. The steel grades of high-strength and low-alloy structural steel mainly include Ninggang Q345B, Q345C, Q345D, Q345E, and 510L. The amount of steel used as a material reaches 1 million tons per year. [0003] Manufacturers of high-strength and high-toughness structural steel report that there are three main problems in the low-alloy carbon steel materials currently used: (1) poor processability; (2) low elongation; (3) insufficient hardness, (4)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/06C22C38/04C22C38/02C22C33/04C21C5/34C21C7/10C21D8/02
CPCC21C5/34C21C7/10C21D8/0205C21D8/0226C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 蔡明伟裘韶均骆仁智闫江辉唐辉贾丽军
Owner NINGBO IRON & STEEL
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