440 MPa-grade continuous-annealed and cold-rolled structural steel plate and production process thereof

A technology of structural steel plate and production process, applied in the field of metallurgy, can solve problems such as poor surface quality and high cost steel plate surface, and achieve the effect of ensuring surface quality and processing performance, low cost, and good prospects for promotion and use

Inactive Publication Date: 2015-01-07
攀钢集团西昌钢钒有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the existing high-Si and high-Mn process idea can improve the relative strength of the solid depth strengthening of the steel plate, the disadvantage is that

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0057] a. Smelting molten steel

[0058] Converter smelting: The temperature of the molten iron in the blast furnace is 1378°C. Steelmaking auxiliary materials are added to the converter to smelt to 1685°C, and then the steel is tapped to the molten steel tank. 500Kg of aluminum-iron alloy (Anyang Jiaxin Refractories Co., Ltd.) is added for pre-processing when 1 / 3 of the steel is tapped. Deoxidation, then add pitch coke (Panzhihua Yangcheng Metallurgical Auxiliary Materials Co., Ltd.) and ferromanganese alloy (Dechang Ferroalloy Co., Ltd.) to the molten steel after deoxidation, so that the content of each component in molten steel is (based on the total weight of molten steel, wt %): C: 0.08%, Si: 0.03%, Mn: 1.29%, P: 0.014%, S: 0.008%, Als: 0.035%, N: 0.0039%, and the balance of Fe and unavoidable impurities, followed by The molten steel tank is treated with argon blowing at the bottom, the argon pressure is 200-400Pa, the argon blowing time is 4 minutes, and the argon flow r...

example 2

[0067] The main steps are basically the same as Example 1, except that the components of molten steel obtained by smelting include: C: 0.07%, Si: 0.05%, Mn: 1.33%, P: 0.015%, S: 0.007%, Als: 0.037 %, N: 0.0034%, and the balance of Fe and unavoidable impurities.

[0068] In addition, before hot rolling, heat the temperature of the slab obtained by continuous casting of the above molten steel to 1210°C, control the final rolling temperature to 875°C, and the coiling temperature to 668°C, the final thickness of hot rolling is 3.25mm, and the final thickness of cold rolling 1.3mm; control the temperature of the soaking section to 780°C, the end temperature of the primary cooling to 385°C, the temperature of the overaging section to 330°C and the final cooling temperature to 144°C, control the cooling rate of the primary cooling to 20°C / s, and the belt speed It is 30m / min, the flat elongation is 1.3%, and the tensile elongation is 0.4%.

[0069] Finally, the mechanical properties ...

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PUM

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Abstract

The invention discloses a 440 MPa-grade continuous-annealed and cold-rolled structural steel plate and a production process thereof. The steel plate comprises the following components in percentage by mass: 0.06-0.12% of C, 0-0.10% of Si, 1.25-1.50% of Mn, 0.002-0.006% of N, 0-0.025% of P, 0-0.010% of S, 0.015-0.050% of Als, and the balance of Fe and unavoidable impurities, as well as ferrite with a volume ratio of 90-95% and pearlite with a volume rate of 5-10%; and the production method of the steel plate comprises the steps of continuous casting, hot rolling, cooling, coiling, cold rolling, continuous annealing and the like. According to the steel plate and the production process thereof disclosed by the invention, a 'low C-low Si-Mn' micro-alloying process thought is adopted in combination with techniques such as external refining, a controlled rolling and controlled cooling process, a process for controlling a relatively low cold rolling reduction ratio, a process of continuous annealing in a two-phase region, and the like, a fine-grained ferrite and pearlite structure containing cold-rolled structural steel plate is obtained.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and more specifically relates to a 440MPa continuous annealing cold-rolled structural steel plate most suitable for automobiles and its production process Background technique [0002] my country's automobile industry has entered a period of rapid development of passenger cars. In order to meet the needs of "weight reduction, energy saving, safety, and environmental protection" in the automobile manufacturing industry, more and more high-strength thin steel plates are used for auto parts. Passenger car bodies The material used for the body and car body is mainly cold-rolled thin steel plate with a thickness of less than 2.5mm, which accounts for more than 50% of the total vehicle weight. The use of high-strength steel plate can make up for the adverse effects on vehicle safety due to thickness reduction. According to the data, every 1% reduction in the weight of the car body can save fuel by 0....

Claims

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Application Information

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IPC IPC(8): C22C38/06C21D8/02C22C33/04
CPCC22C38/02C21D8/0205C22C38/001C22C38/04
Inventor 刘庆春郑之旺周一林樊华张功庭王德宇
Owner 攀钢集团西昌钢钒有限公司
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