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Hot rolled steel plate of 490 MPa level and production method thereof

A technology of hot-rolled steel plate and production method, which is applied in the field of metallurgy, can solve the problems of high smelting cost and influence on popularization and use, and achieve the effects of simple production process, good prospects for popularization and use, and improved cold forming performance

Inactive Publication Date: 2011-01-05
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low C-Mn-V microalloying or trace Nb alloying steels are produced by controlled rolling and controlled cooling. Because of the disadvantage of high smelting cost after adding alloy elements, it affects the popularization and use of the above method

Method used

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  • Hot rolled steel plate of 490 MPa level and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] a. Smelting molten steel: The smelting equipment is a 120-ton top-blown converter. The blast furnace molten iron is used as raw material. The temperature of the blast furnace molten iron is 1375°C. Add steelmaking auxiliary materials and smelt to 1695°C to tap the molten steel tank. Add 0.5 tons of aluminum when tapping 1 / 3 Ferroalloy (Anyang Jiaxin Refractories Co., Ltd.) is pre-deoxidized, and then pitch coke (Panzhihua Yangcheng Metallurgical Auxiliary Materials Co., Ltd.) and silicon-manganese alloy (Dechang Ferroalloy Co., Ltd.) are added to the deoxidized molten steel to make the components of the molten steel The content is (based on the total weight of molten steel, wt%) C: 0.08, Si: 0.20, Mn: 1.10, P: 0.014, S: 0.010, Nb: 0.02, Ti: 0.01, Al: 0.044, N: 0.0038, The rest is Fe. Subsequently, the molten steel tank is treated with bottom blowing argon gas on the small platform outside the furnace, the pressure of argon gas is 200-400 Pa, and the time is 4 minutes. ...

Embodiment 2

[0048] The preparation method is basically the same as that of Example 1, except that the composition of molten steel obtained by converter smelting is (wt%) C: 0.07, Si: 0.23, Mn: 1.13, P: 0.015, S: 0.006, Nb: 0.018, Ti: 0.01 , Al: 0.037, N: 0.0034, the rest is Fe, and the hot-rolled steel plate produced by the aforementioned molten steel has a slab exit temperature of 1205°C, finish rolling temperature of 888°C, coiling temperature of 605°C, and a hot-rolled finished product thickness of 7.0°C. mm.

[0049] The prepared coils were tested for mechanical properties, and the yield strength Rel, tensile strength Rm and elongation A at room temperature were detected respectively. 200mm , Tensile properties are carried out in accordance with GB / T228 tensile test method for metal materials at room temperature. The yield strength (Rel) of the finished product is 415MPa, the tensile strength (Rm) is 510MPa, and the elongation (A 200mm ) is 23%, the performance of the cold bending p...

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Abstract

The invention belongs to the technical field of metallurgy, and in particular relates to a micro-niobium alloy hot rolled steel plate of a 490 MPa level and a production method thereof, aiming to solving the first technical problem of providing the hot rolled steel plate of the 490 MPa level with excellent comprehensive performance. The hot rolled steel plate of the 490 MPa level is prepared from the following chemical components in percentage by weight: 0.04-0.11 percent of C, 0.13-0.27 percent of Si, 0.9-1.30 percent of Mn, 0.001-0.007 percent of N, 0-0.027 percent of P, 0-0.017 percent of S, 0.01-0.09 percent of Al, 0.013-0.027 percent of Nb, 0.004-0.012 percent of Ti and the balance of Fe. The hot rolled steel plate of the 490 MPa level, which is provided by the invention, reaches the yield strength not less than 380 MPa, tensile strength not less than 490 MPa, elongation not less than 17 percent and excellent cold bending performance, has favorable room-temperature mechanical performance and process performance and fully accords with the requirements on technical indexes.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of a 490MPa micro-niobium alloyed hot-rolled steel plate. Background technique [0002] With the increasing development of the national economy, the automobile industry has become a pillar industry in my country, and the consumption of hot-rolled steel sheets for automobiles is increasing year by year. also increased accordingly. [0003] For trucks, hot-rolled steel plates for automotive beams are one of the materials with the most stringent quality requirements in automotive structural parts. In addition to conventional structural strength performance requirements, they must also have good formability, dent resistance, and sufficient structural rigidity And welding performance, in order to withstand stamping and forming under various strain states without breaking, avoid local deformation of the car body during the load process, especially in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 刘庆春郑之旺刘勇李正荣冯远超黄徐晶
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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