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A kind of 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: 2021-06-22
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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  • A kind of preparation method of 1300mpa grade rare earth reverse transformation q&p steel
  • A kind of preparation method of 1300mpa grade rare earth reverse transformation q&p steel
  • A kind of 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 preparation method of 1300MPa grade rare earth reverse transformation Q&P steel, the preparation steps of which are: (1) smelting and casting of the steel plate: the composition is: C: 0.17%, Mn: 2.31%, Si: 1.10 %, Al: 0.80%, V: 0.06%, B: 0.002%, and the balance is Fe and unavoidable impurities. The composition powder of the present invention is smelted in an electric arc furnace, transferred to an IF furnace for refining, and fed Adding 5% cerium, 2.5% lanthanum, the rest is Fe and other unavoidable impurities mixed rare earth ferroalloy by wire method to make cast slab.

[0036] (2) Heat preservation, hot rolling, and quenching: heat the cast slab to 1050°C, hold heat for 1.2h, carry out hot rolling after heat preservation, start rolling at 950°C, and finish rolling at 850°C to obtain a 1.8mm thick steel plate , quenched to room temperature.

[0037] (3) The first reverse transformation heat preservation quenching: heat the steel pl...

Embodiment 2

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

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

[0045] (3) The first reverse transformation heat preservation quenching: heat the steel plat...

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Abstract

The invention discloses a preparation method of 1300MPa grade rare earth reverse transformation Q&P steel. Its chemical composition by mass percentage is: C: 0.12‑0.18%, Mn: 2.0‑3.0%, Si: 0.8‑1.2%, Al: 0.6‑1.0%, V: 0.05‑0.08%, B: 0.001‑0.003%, P<0.02%, S<0.01%, the balance is Fe and unavoidable impurities. According to the composition design of the present invention, a certain amount of mixed rare earth ferroalloy is added, smelted and made into cast slabs. Combine the reverse transformation process with the Q&P process to increase the stability of austenite. Low Si content ensures surface quality and hot rolling performance, and improves hardenability through Al and B, adding a certain amount of V to introduce a dispersed second phase, V and Si are combined to enhance the work hardening ability of ferrite. By adding a suitable content of rare earth, it plays a role in modification, refines the crystal grains, and improves the comprehensive mechanical properties of the steel plate. The steel plate produced by the invention has a microstructure of martensite, ferrite, retained austenite and dispersed second phases. The tensile strength is greater than 1300MPa, and the elongation after fracture is greater than 15%. It has a good combination of strength and plasticity.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing 1300MPa grade rare earth reverse transformation Q&P steel. Background technique [0002] In recent years, my country's automobile industry has developed rapidly, but it is also facing a series of problems such as energy saving, 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-partitioning (quenching and partitioning-Q&P) process is to fully austenitize the steel plate and then quench it to M s and M f Between the temperature, the carbon element is partitioned to improve the stability of the 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 multiphase, metastable, and multiscale hi...

Claims

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Application Information

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Patent Type & Authority Patents(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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