Thin-gauge alloy steel and production method thereof

Abstract

The invention discloses thin-gauge alloy steel and a production method thereof, and relates to the technical field of steel production, and the thin-gauge alloy steel comprises the following chemical components in percentage by mass: less than or equal to 0.20% of C, 0.10-0.50% of Si, 0.30-2.00% of Mn, less than or equal to 0.025% of P, less than or equal to 0.020% of S, less than or equal to 0.11% of Nb, less than or equal to 0.20% of V, 0.006-0.020% of Ti, less than or equal to 1.00% of Cr, less than or equal to 0.80% of Ni, less than or equal to 0.30% of Mo, less than or equal to 0.80% of Cu, 0.015-0.060% of Al, less than or equal to 0.0040% of B and the balance of Fe and inevitable impurities. According to the characteristics of the thin-gauge low-carbon alloy steel, the composite rolling technology is developed, low-temperature rolling is achieved, the product toughness is improved, and meanwhile the product yield is greatly increased.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to a thin gauge alloy steel and a production method thereof. Background technique [0002] With the rapid development of the national economy, the steel industry has achieved rapid development. Low-carbon alloy steel has been widely used in the steel industry, and its products account for 80% of the domestic steel consumption. Among them, due to the high rolling force of the rolling mill, the shape of the thin-gauge steel is not easy to control after watering, which may easily cause surface quality problems such as scratches on the upper and lower surfaces of the steel plate, and the production of thin-gauge products is seriously affected due to the low quality of the single product. , has a great negative effect on the efficiency of the enterprise. [0003] At present, thin-gauge steel is mainly produced by hot continuous rolling mills in China, and the maximum rolling wi...

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Problems solved by technology

Among them, due to the high rolling force of the rolling mill, the shape of the thin-gauge steel is not easy to control after watering, which may easily cause surface quality problems such as scratches on the upper and lower surfaces of the steel plate, and the thin-gauge products are seriously affected by the low quality of each product. , has a great negative effect on the profitability of the enterprise

[0003] At present, thin-gauge steel is mainly produced by hot continuous rolling mills in China, and the maximum rolling width is only 2100mm. The production of wide and thin steel plates in conventional medium-thick plate or wide-thick plate rolling lines is limited by the rapid temperature drop of the rolled pieces during the rolling process. Only second-fire rolling can be implemented and it is difficult to develop stably. Most of this type of high-grade wide and thin specification steel rely on imports to meet demand, while high-end steel products with a product width of more than 2100mm and a thickness of 4-5mm are completely dependent on imports. A few companies such as JFE, Pohang, and Dillingen in Japan can produce in batches, while the domestic market is almost monopolized by imported products. Not only are the prices high, but the order cycle is long, which greatly restricts my country's thin-gauge low-carbon alloys. steel development

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