Component design and production method of 1500 MPa-grade low-carbon and medium-manganese copper-contained steel

A production method and composition design technology, which is applied to the composition design and production field of 1500MPa low-carbon medium-manganese copper-containing steel, can solve the problems of cost increase, low alloy content, high alloy content, etc., and achieve the effect of improving performance

Active Publication Date: 2017-08-15
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The first generation of advanced high-strength steel is a multi-phase steel mainly composed of ferrite structure. It has low alloy content and low cost. However, due to its small strength and plasticity, it is difficult to meet the future lightweight and safety requirements of automobiles. The second generation The mechanical properties of advanced high-strength steel are excellent, but because of its high alloy content, the cost is greatly increased. At the same time, too high alloy content makes the welding performance and coating performance of the steel plate worse

Method used

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  • Component design and production method of 1500 MPa-grade low-carbon and medium-manganese copper-contained steel
  • Component design and production method of 1500 MPa-grade low-carbon and medium-manganese copper-contained steel

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Embodiment 1

[0031] Example 1 The composition design and production method of a 1500MPa low-carbon medium-manganese copper-containing steel involved in the present invention includes the following steps: (1) Smelting and casting processes. The composition is: C: 0.2%, Mn: 3.5%, Si: 0.8%, Al: 1.2%, Cr: 0.8%, Cu: 0.8%, Ni: 0.4%, N: 0.008%, B: 0.002%, and The mixed alloy powder with the amount of Fe is smelted in an electric arc furnace, converter, or open hearth furnace, and then transferred to an LF refining furnace. During the smelting period, the nitrogen pressure required in the furnace is maintained to add N element, and finally cast into a slab or ingot.

[0032] (2) Heating and insulation. Transfer the billet or ingot to a continuous furnace for heating and heat preservation, so that the alloying elements are evenly dissolved in the austenite. The heating temperature is kept between 1050°C and the heat preservation time is 2 hours.

[0033] (3) Hot rolling process. After the heat pr...

Embodiment 2

[0035] Example 2 The composition design and production method of a 1500MPa low-carbon medium-manganese copper-containing steel involved in the present invention includes the following steps: (1) Smelting and casting processes. The composition is: C: 0.21%, Mn: 3.6%, Si: 0.7%, Al: 1.35%, Cr: 0.7%, Cu: 0.7%, Ni: 0.3%, N: 0.009%, B: 0.002%, and The mixed alloy powder with the amount of Fe is smelted in an electric arc furnace, converter, or open hearth furnace, and then transferred to an LF refining furnace. During the smelting period, the nitrogen pressure required in the furnace is maintained to add N element, and finally cast into a slab or ingot.

[0036] (2) Heating and insulation. Transfer the casting slab or ingot to a continuous furnace for heating and heat preservation, so that the alloying elements are uniformly dissolved in the austenite, the heating temperature is kept at 1070°C, and the heat preservation time is 1.8 hours.

[0037] (3) Hot rolling process. After th...

Embodiment 3

[0039] Example 3 The composition design and production method of a 1500MPa low-carbon medium-manganese copper-containing steel involved in the present invention includes the following steps: (1) Smelting and casting processes. The composition is: C: 0.23%, Mn: 3.8%, Si: 0.55%, Al: 1.5%, Cr: 0.6%, Cu: 0.6%, Ni: 0.25%, N: 0.01%, B: 0.002%, and The mixed alloy powder with the amount of Fe is smelted in an electric arc furnace, converter, or open hearth furnace, and then transferred to an LF refining furnace. During the smelting period, the nitrogen pressure required in the furnace is maintained to add N element, and finally cast into a slab or ingot.

[0040] (2) Heating and insulation. Transfer the billet or ingot to a continuous furnace for heating and heat preservation, so that the alloy elements are evenly dissolved in the austenite. The heating temperature is kept at 1100°C and the heat preservation time is 1.5 hours.

[0041] (3) Hot rolling process. After the heat preser...

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Abstract

The invention relates to component design and a production method of 1500 MPa-grade low-carbon and medium-manganese copper-contained steel. The 1500 MPa-grade low-carbon and medium-manganese copper-contained steel comprises the following chemical components in percentage by mass: 0.20-0.23% of C, 0.5-0.8% of Si, 3.5-4.0% of Mn, 1.2-2.0% of Al, 0.5-1.0% of Cr, 0.6-1.0% of Cu, 0.2-0.5% of Ni, 0.003-0.012% of N, 0.00051-0.003% of B, and the balance of Fe and inevitable impurities. One part of alloy elements are added based on traditional TRIP steel to largely increase the content of manganese to reach the medium-manganese range; when Al is used for replacing the Si elements, a proper amount of Si elements are retained, so that the Al and Si elements are matched for use; and a certain quantity of precipitation-hardened Cu elements are added to match with a proper amount of Ni elements for use to eliminate the hot brittle phenomenon caused by Cu in hot working. In addition, few Cr elements are added; a proper amount of N elements are added to match with the Al elements for use; through matching between hot rolling and hot partition processes, a martensite+residual austenite+separated second-phase particle structure with ultrahigh strength and excellent plasticity is obtained; and the tensile strength exceeds 1500 MPa.

Description

technical field [0001] The invention relates to a composition design and production method of high-strength steel for automobiles, in particular to a composition design and production method of 1500MPa low-carbon medium-manganese copper-containing steel. Background technique [0002] At present, in order to save energy, reduce fuel consumption, and reduce exhaust emissions, the production of energy-saving and environmentally friendly vehicles has become one of the main goals of the world's auto companies. For this reason, many auto companies at home and abroad have adopted a series of measures, the most effective measures One of them is vehicle lightweighting. According to the data, if advanced high-strength steel (AHSS) plates are used, the original thickness of 1.0-1.2mm body steel plate can be reduced to 0.7-0.8mm, and the weight of the body will be reduced by 15%-20%. Fuel saving 8%~15%. So far, countries around the world have developed various advanced high-strength s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/42C22C38/54C22C38/58C22C38/06C22C33/04
CPCC22C33/04C22C38/001C22C38/06C22C38/42C22C38/54C22C38/58
Inventor 景财年涂英明石子杰邢兆贺
Owner SHANDONG JIANZHU UNIV
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