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High strength weathering resistant steel and preparation method

A weathering steel and high-strength technology, applied in the field of high-strength weathering steel and its preparation, can solve the problem that the process window of iron oxide scale is difficult to take into account, and achieve the effect of shortening the forming time, high strength and reducing the use of coating.

Inactive Publication Date: 2013-05-15
武汉钢铁有限公司
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Problems solved by technology

However, in terms of composition design and process control, it is difficult to take into account the four aspects of alloy composition, structure type, steel purity, and surface oxide scale, especially the controlled rolling and cooling process and oxide scale process window for high-strength steel. difficult to balance

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  • High strength weathering resistant steel and preparation method
  • High strength weathering resistant steel and preparation method
  • High strength weathering resistant steel and preparation method

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Embodiment Construction

[0068] The technical solutions of the present invention will be further described below in conjunction with the drawings and specific embodiments.

[0069] According to the composition requirements provided by the present invention, three heats of steel were smelted by converter steelmaking-LF-RH-continuous casting process as three embodiments of the present invention. In converter steelmaking, deep desulfurization pretreatment of molten iron is used to ensure a low S content in steel, and calcium and magnesium deoxidizers are used for deoxidation to reduce oxygen and aluminum in molten steel, and to improve the shape, size and distribution of inclusions. Calcium treatment is used in the LF furnace to control the feeding amount and speed of the calcium wire. After RH vacuum treatment, the chemical composition in the steel meets the weight percentage (wt%): C: 0.01~0.05%, Si≤0.2%, Mn: 1.5~2.0%, P≤0.02%, S≤0.008%, Cu: 0.2~0.4%, Ni: 0.2~0.4%, Cr: 0.4~0.7%, Mo: 0.15~0.50%, Nb: 0....

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Abstract

The invention discloses a high strength weathering resistant steel, an iron oxide layer is covered on the surface of the weathering resistant steel, Fe3O4 content in the iron oxide layer, the thickness is 7-10 mum, the weathering resistant steel comprises the following components by weight: 0.01-0.05% of C, less than or equal to 0.2% of Si, 1.5-2.0% of Mn, less than or equal to 0.02% of P, less than or equal to 0.008% of S, 0.2-0.4% of Cu, 0.2-0.4% of Ni, 0.4-0.7% of Cr, 0.15-0.50% of Mo, 0.02-0.04% of Nb, 0.015-0.025% of Ti, less than or equal to 0.03% of Als and the balance of Fe and inevitable impurities. The invention also provides a preparation method for the weathering resistant steel. The prepared weathering resistant steel has good mechanical property, weather resisting property and welding performance, and can be used under the condition that the coating is mitigated.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and in particular relates to a high-strength weather-resistant steel with reduced coating and a preparation method thereof. Background technique [0002] With the rapid development of construction machinery, automobiles, containers and other industries, the performance and quality requirements of steel materials are also getting higher and higher. The use of high-strength steel can reduce the weight of components and reduce the fuel consumption of equipment. In the fields of containers, construction machinery, automobiles and railway vehicles, high strength and light weight have become a trend. [0003] Steel materials are subject to atmospheric corrosion to varying degrees in the process from raw material inventory, parts processing and assembly, transportation and storage of finished products, to final service. According to statistics, the total annual cost of corrosion in my country re...

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Application Information

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IPC IPC(8): C22C38/58C22C33/04C21D8/02
Inventor 刘洋韩斌杨奕郭爱民蒋扬虎谭文汪水泽
Owner 武汉钢铁有限公司
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