Preparation method of 1300MPa-grade rare earth reverse transformation Q & P steel

A reverse conversion and rare earth technology, applied in the field of iron and steel metallurgy, can solve problems such as increasing costs, and achieve the effect of improving welding performance, increasing content and stability

Active Publication Date: 2020-03-13
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the addition of more rare earths will greatly increase the cost

Method used

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  • Preparation method of 1300MPa-grade rare earth reverse transformation Q & P steel
  • Preparation method of 1300MPa-grade rare earth reverse transformation Q & P steel
  • Preparation method of 1300MPa-grade rare earth reverse transformation Q & P steel

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Embodiment 1

[0035] The present invention relates to a 1300MPa grade rare earth reverse transformation Q&P steel preparation method. The preparation steps are as follows: (1) Steel plate smelting and casting: the components are: C: 0.17% by mass, Mn: 2.31%, Si: 1.10 %, Al: 0.80%, V: 0.06%, B: 0.002%, the balance is Fe and unavoidable impurities. The powder of the composition of the present invention is smelted in an electric arc furnace, transferred to an IF furnace for refining, and fed through In the wire method, a mixed rare earth iron alloy containing 5% cerium, 2.5% lanthanum, and the rest is Fe and other unavoidable impurities is added to prepare a cast slab.

[0036] (2) Heat preservation, hot rolling, quenching: heat the cast slab to 1050℃, keep it for 1.2h, then perform hot rolling after the heat preservation, the opening temperature is 950℃, and finish rolling at 850℃ to obtain 1.8mm thick steel plate. , Quench to room temperature.

[0037] (3) The first reverse transformation heat p...

Embodiment 2

[0043] The present invention relates to a 1300MPa grade rare earth reverse transformation Q&P steel preparation method. The preparation steps are as follows: (1) Steel plate smelting and casting: the components are: C: 0.17% by mass, Mn: 2.31%, Si: 1.10 %, Al: 0.80%, V: 0.06%, B: 0.002%, the balance is Fe and unavoidable impurities. The powder of the composition of the present invention is smelted in an electric arc furnace, transferred to an IF furnace for refining, and fed through In the wire method, a mixed rare earth iron alloy containing 5% cerium, 2.5% lanthanum, and the rest is Fe and other unavoidable impurities is added to prepare a cast slab.

[0044] (3) Heat preservation, hot rolling, quenching: heat the cast slab to 1050°C, hold for 1.2h, and then perform hot rolling after heat preservation. The opening temperature is 950°C, and finish rolling is performed at 850°C to obtain a 1.8mm thick steel plate. , Quench to room temperature.

[0045] (3) The first reverse transf...

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Abstract

The invention discloses a preparation method of 1300MPa-grade rare earth reverse transformation Q & P steel. The steel comprises the following chemical components in percentage by mass: 0.12%-0.18% ofC, 2.0%-3.0% of Mn, 0.8%-1.2% of Si, 0.6%-1.0% of Al, 0.05%-0.08% of V, 0.001%-0.003% of B, 0.02% or below of P, 0.01% or below of S and the balance of Fe and inevitable impurities. According to thecomponent design, a certain amount of mixed rare earth iron alloy is added, smelting is conducted to obtain a casting blank. A reverse transformation process is combined with a Q & P process, so thatthe austenite stability is improved. The Si content is low, so that the surface quality and the hot rolling performance are guaranteed. The hardenability is improved through the Al and the B, a certain amount of the V is added, a dispersedly-distributed second phase is introduced, and the work hardening capacity of ferrite is enhanced through matching of the V and the Si. By adding the proper amount of the rare earth, the modification effect is achieved, grains are refined, and the comprehensive mechanical property of the steel plate is improved. According to the steel plate produced by the method, the microstructure is martensite, ferrite, retained austenite and the dispersedly-distributed second phase, the tensile strength is larger than 1300 MPa, the percentage elongation after fractureis larger than 15%, and the steel plate has good strength and plasticity matching.

Description

Technical field [0001] The present invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing a 1300MPa grade rare earth reverse transformation Q&P steel. Background technique [0002] In recent years, my country's automobile industry has achieved rapid development, but it is also facing a series of problems in energy conservation, emission reduction, and safety. The application of the third-generation advanced high-strength steel can effectively improve the lightweight level of automobiles. The traditional quenching and partitioning-Q&P process is to completely austenitize the steel plate and then quench it to M s And M f Between the temperature, the carbon element is distributed to improve the stability of retained austenite, and finally quenched to room temperature. The microstructure of Q&P steel is martensite and retained austenite. According to the design principles of multi-phase, metastable, multi-scale high-strength s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C21C7/06C21C7/064C21D8/02
CPCC21C7/06C21C7/064C21D8/0205C21D8/0226C21D8/0247C21D2211/001C21D2211/005C21D2211/008C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 景财年邢兆贺候玉栋丁啸云吕明桦涂英明
Owner SHANDONG JIANZHU UNIV
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