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Low-carbon silicon-manganese high-strength steel containing Cu and production method of steel

A carbon-silicon-manganese-based technology and a production method, which are applied in the metallurgical field, can solve the problems of reducing the strength of lath martensite, the carbon content cannot be too low, and the carbon distribution effect is limited, so as to improve strength and toughness, improve mechanical properties, and improve production Simple and easy method

Active Publication Date: 2015-07-22
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon content should not be too low, otherwise the carbon distribution effect will be limited. On the one hand, the amount of retained austenite after quenching will be reduced, which is not conducive to the improvement of plasticity; on the other hand, the carbon content in lath martensite will be reduced, reducing lath martensitic strength
This leads to the fact that the strength and plasticity of Q&P treated steel with a C content of less than 0.2% in commercial use is lower than 30000MPa·%.

Method used

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  • Low-carbon silicon-manganese high-strength steel containing Cu and production method of steel
  • Low-carbon silicon-manganese high-strength steel containing Cu and production method of steel
  • Low-carbon silicon-manganese high-strength steel containing Cu and production method of steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A Cu-containing low-carbon silicon-manganese high-strength steel, the chemical composition mass percentage is: C: 0.18%, Si: 1.5%, Mn: 1.3%, Cu: 0.55%, Ni: 0.4%, P: 0.04%, S: 0.02%, the balance is Fe and unavoidable impurities. The elongation of Cu-containing low-carbon silicon-manganese high-strength steel is 25%, the strength-plastic product is 31180MPa·%, and the retained austenite content is 10.2%.

[0027] A production method of Cu-containing low-carbon silicomanganese high-strength steel is carried out as follows:

[0028] (1) Smelting is carried out according to the above chemical composition, and the cast billet is forged into a slab;

[0029] (2) Hot rolling the slab to obtain a final rolled plate;

[0030] Hot rolling is divided into rough rolling and finish rolling in sequence; the rough rolling start temperature is 1080°C, the rough rolling pass deformation is 35%, the finish rolling total deformation is 55%, the final rolling temperature is 840°C, and the...

Embodiment 2

[0033] A Cu-containing low-carbon silicon-manganese high-strength steel, the chemical composition mass percentage is: C: 0.22%, Si: 1.3%, Mn: 1.5%, Cu: 0.4%, Ni: 0.34%, P: 0.02%, S: 0.01%, the balance is Fe and unavoidable impurities. The elongation of Cu-containing low-carbon silicon-manganese high-strength steel is 22.3%, the strength-plastic product is 30240MPa·%, and the retained austenite content is 9.6%.

[0034] A production method of Cu-containing low-carbon silicomanganese high-strength steel is carried out as follows:

[0035] (1) Smelting is carried out according to the above chemical composition, and the cast billet is forged into a slab;

[0036] (2) Hot rolling the slab to obtain a final rolled plate;

[0037] Hot rolling is divided into rough rolling and finish rolling in sequence; the rough rolling start temperature is 1050°C, the rough rolling pass deformation is 45%, the finish rolling total deformation is 60%, the final rolling temperature is 850°C, and th...

Embodiment 3

[0040]A Cu-containing low-carbon silicon-manganese high-strength steel, the chemical composition mass percentage is: C: 0.2%, Si: 1.5%, Mn: 1.8%, Cu: 0.5%, Ni: 0.32%, P: 0.05%, S: 0.03%, the balance is Fe and unavoidable impurities. The elongation of Cu-containing low-carbon silicon-manganese high-strength steel is 20.8%, the strength-plastic product is 28589MPa·%, and the retained austenite content is 8.5%.

[0041] A production method of Cu-containing low-carbon silicomanganese high-strength steel is carried out as follows:

[0042] (1) Smelting is carried out according to the above chemical composition, and the cast billet is forged into a slab;

[0043] (2) Hot rolling the slab to obtain a final rolled plate;

[0044] Hot rolling is divided into rough rolling and finish rolling in sequence; the rough rolling start temperature is 1030°C, the rough rolling pass deformation is 25%, the finish rolling total deformation is 50%, the final rolling temperature is 830°C, and the ...

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Abstract

The invention relates to low-carbon silicon-manganese high-strength steel containing Cu and a production method of the steel. The low-carbon silicon-manganese high-strength steel containing Cu comprises the following chemical components by weight percent: 0.18-0.22% of C, 1.3-1.5% of Si, 1.3-1.8% of Mn, 0.4-0.55% of Cu, 0.32-0.4% of Ni, less than or equal to 0.05% of P, less than or equal to 0.03% of S and the balance of Fe and unavoidable impurities. The production method comprises the following steps: smelting according to the chemical components, and forging a casting blank into a slab; performing hot rolling on the slab to obtain a final rolling plate; and performing heat treatment process to obtain the high-strength steel. By adopting the method, the retained austenite volume fraction in the steel is increased, the mechanical property is improved, and the bad influence on the smelting and casting process by adding plenty of Mn is avoided. The production method is simple and practicable and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a Cu-containing low-carbon silicon-manganese high-strength steel and a production method thereof. Background technique [0002] With the increase in the use of automobiles, a series of environmental and safety problems have emerged, and improving the strength and toughness of body materials is the most effective way to solve the problems. Therefore, research on high-strength steel for automobiles has continued to deepen in recent years. Since the 1980s, the first generation of high-strength steel represented by dual-phase steel (DP) and transformation-induced plasticity steel (TRIP) has been widely researched and applied, and its strength-plastic product is within 20000 MPa·%, but due to Its strong plastic product is low, and its crash safety performance is poor, so it cannot be used in cars with high crash performance requirements. The second-generation high-stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C21D8/02
Inventor 陈连生田亚强郑小平宋进英魏英立张宏军徐静辉
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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