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High-strength-and ductility-product cold-rolled TRIP steel and preparing method thereof

A high-strength plastic product and cold-rolled steel strip technology, which is applied in the field of high-strength plastic product cold-rolled automotive steel, can solve problems such as unreasonable strength-plastic product matching, formability needs to be improved, and surface quality deterioration, so as to improve the surface quality , Improve the formability and impact absorption energy, and the effect of large elongation

Active Publication Date: 2017-05-10
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the early research and development process of the first generation of high-strength TRIP steel, more expensive alloy elements such as Ni and Cr were added to the chemical composition, and the application was limited.
Most of the TRIP steels developed in recent years are C-Si-Mn system, and a certain amount of Nb, V and other elements are added. Although they have excellent mechanical properties, the matching of strength and plasticity is still unreasonable, the formability needs to be improved, and the weldability is poor. Poor, and the Si content is high, not only makes the hot rolling show serious oxidation, but also the SiO formed by Si oxidation during the galvanizing process 2 and Mn 2 SiO 3 It leads to the deterioration of the wettability of the steel plate surface in liquid zinc, resulting in difficulty in coating and poor surface quality

Method used

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  • High-strength-and ductility-product cold-rolled TRIP steel and preparing method thereof
  • High-strength-and ductility-product cold-rolled TRIP steel and preparing method thereof
  • High-strength-and ductility-product cold-rolled TRIP steel and preparing method thereof

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preparation example Construction

[0026] The invention provides a method for preparing high-strength plasticity cold-rolled TRIP steel. The percentages of the chemical components of the slab are C0.20-0.23%, Si 0.35-0.50%, Mn 2.0-2.4%, Alt 1.6-2.5%, P ≤0.01%, S ≤0.005%, and the rest are Fe and unavoidable impurities. The slab that meets this chemical composition is subjected to the following preparation steps:

[0027] 1) Forging, heating, hot-rolling, and water-cooling coiling of the billet to obtain a hot-rolled steel strip;

[0028] 2) pickling and cold-rolling the hot-rolled steel strip to make a cold-rolled steel strip;

[0029] 3) Pre-quenching the cold-rolled steel strip, specifically: reheating the cold-rolled steel strip and keeping it warm for a certain period of time, and then water-quenching to room temperature to obtain a steel strip with a full martensitic structure;

[0030] 4) Cleaning the quenched steel strip with full martensitic structure and then annealing it. After annealing, it is quickl...

Embodiment 1

[0049] The main chemical composition (mass percentage%) of the slab is shown in Table 1, and it also contains 0.006% P, 0.003% S, 0.004% N, and the rest is Fe and unavoidable impurities. The preparation steps are basically the same as those of Comparative Example 4, the only difference being that in the annealing step of Example 1, the steel strip at room temperature was heated to 780°C, 850°C, and 900°C, respectively. The mechanical properties of the finished steel strips are shown in Table 2.

Embodiment 2

[0051] The main chemical composition (mass percentage%) of the slab is shown in Table 1, and it also contains 0.005% P, 0.004% S, 0.002% N, and the rest is Fe and unavoidable impurities. The preparation steps adopt the same hot-rolling and cold-rolling steps as Comparative Example 1 to obtain a cold-rolled steel strip; then reheat the cold-rolled steel strip to 1150° C., keep it warm for 6 minutes, and then water-quench to room temperature; The strips were heated to 780°C and 850°C respectively, and held for 4 minutes and 6 minutes respectively, and then rapidly cooled to 425°C and held for 6 minutes respectively to obtain finished steel strips. Its mechanical properties are shown in Table 2.

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Abstract

The invention discloses high-strength-and ductility-product cold-rolled TRIP steel and a preparing method thereof and belongs to the technical field of high-strength-and ductility-product cold-rolled automobile steel. The high-strength-and ductility-product cold-rolled TRIP steel comprises, by mass percent, 0.20%-0.23% of C, 0.35%-0.50% of Si, 2.0%-2.4% of Mn, 1.6%-2.5% of Al, smaller than or equal to 0.01% of P, smaller than or equal to 0.005% of S and the balance Fe and inevitable impurities. The preparing method includes smelting, hot rolling, cold rolling, pre-quenching and annealing. The high-strength-and ductility-product cold-rolled TRIP steel is high in strength, large in elongation rate, high in strength and ductility product and good in strength and ductility matching, and the forming performance and collision absorbing energy of the steel are greatly improved. Alloys of the steel grade are low in cost, the steel plate welding performance is good, the coating performance is good, the surface quality is good, and the strength and ductility product of the steel can reach 25 GPa.% to 33 GPa.%.

Description

technical field [0001] The invention belongs to the technical field of high-strength plastic cold-rolled steel for automobiles, in particular to a high-strength plastic cold-rolled TRIP steel and a preparation method thereof. Background technique [0002] In recent years, advanced high-strength steel has developed rapidly. The first-generation high-strength steels with a strength-plastic product of 15-20GPa·%, such as dual-phase (DP) steels, phase transformation-induced plasticity (TRIP) steels, complex-phase (CP) steels, and martensitic steels, have been applied in automobiles. , which plays a very important role in the lightweight of automobiles. However, the formability of the first generation of advanced high-strength steel needs to be improved to meet the increasing demands of automotive design. As the twinning induced plasticity (TWIP) of the second-generation advanced high-strength steel, its strong-plastic product can reach 60GPa·%, but due to its low yield strengt...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/06C22C38/02C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0247C21D2211/001C21D2211/008C22C38/02C22C38/04C22C38/06
Inventor 赵征志梁江涛张才华梁驹华袁洪涛祝梅唐荻武会宾赵爱民苏岚
Owner UNIV OF SCI & TECH BEIJING
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