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1180 MPa-grade ultrahigh-strength low-cost cold-rolled quenched partition steel and manufacturing method thereof

A technology of quenching and partitioning and ultra-high strength, which is applied in the field of 1180MPa ultra-high-strength low-cost cold-rolled quenching and partitioning steel and its manufacturing. Improve the degree of deformation and improve the effect of mechanical properties

Inactive Publication Date: 2019-08-06
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first generation of advanced high-strength steels, mainly consisting of dual-phase (DP) steel, complex-phase (CP) steel, and phase transformation-induced plasticity (TRIP) steel, etc., can only Simply achieving high strength or high plasticity cannot meet the requirements of the future development of the automotive industry
The second-generation advanced high-strength steels are mainly twinning-induced plasticity (TWIP) steels and plasticity-induced lightweight (L-IP) steels. Due to the large amount of alloying elements, the production costs are relatively high.
In the existing Q&P process, the two-step Q&P process has better mechanical properties and higher elongation. However, due to high equipment requirements, most steel plants do not have production capacity and are difficult to be applied on a large scale

Method used

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  • 1180 MPa-grade ultrahigh-strength low-cost cold-rolled quenched partition steel and manufacturing method thereof
  • 1180 MPa-grade ultrahigh-strength low-cost cold-rolled quenched partition steel and manufacturing method thereof
  • 1180 MPa-grade ultrahigh-strength low-cost cold-rolled quenched partition steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Smelt according to the mass percentage of the chemical composition described in Table 1 to obtain a cast slab with a thickness of 100 mm. The hot rolling adopts the following process: heat the slab with a thickness of 100 mm from room temperature to 1250 ° C and keep it for 2 hours; the hot rolling process is divided into rough rolling stage and In the finish rolling stage, the rough rolling start temperature is 1170°C, the finish rolling temperature is 1100°C, the intermediate plate thickness after rough rolling is 18mm, the finish rolling start temperature is 1050°C, the finish rolling finish temperature is 890°C, and continuous cooling is adopted after the finish rolling , the cooling rate is 30°C / s, and the coiling temperature is 690°C. At this time, the structure of the hot-rolled sheet is ferrite + pearlite, and the thickness of the hot-rolled sheet is 4.0mm. The cold-rolling process is as follows: the hot-rolled sheet is pickled and then cold-rolled with a reducti...

Embodiment 2

[0037] Smelting is carried out according to the mass percentage of the chemical composition to obtain a slab with a thickness of 60mm. The hot rolling adopts the following process: heat the slab with a thickness of 60mm from room temperature to 1200°C and keep it for 4h; the hot rolling process is divided into rough rolling stage and finish rolling stage, the rough rolling start temperature is 1180°C, the finish rolling temperature is 1120°C, the intermediate plate thickness after rough rolling is 16mm, the finish rolling start temperature is 1000°C, the finish rolling temperature is 860°C, continuous cooling is adopted after the finish rolling, cooling The speed is 30°C / s, and the coiling temperature is 680°C. At this time, the structure of the hot-rolled sheet is ferrite + pearlite, and the thickness of the hot-rolled sheet is 3.2mm. The cold-rolling process is as follows: the hot-rolled plate is pickled and then cold-rolled with a reduction rate of 50%, and the thickness of ...

Embodiment 3

[0042] Smelt according to the mass percentage of the chemical composition described in Table 1 to obtain a cast slab with a thickness of 50mm. The hot rolling adopts the following process: the slab with a thickness of 50mm is heated from room temperature to 1225°C and kept for 3h; the hot rolling process is divided into rough rolling stage and In the finish rolling stage, the rough rolling start temperature is 1170°C, the finish rolling temperature is 1100°C, the intermediate plate thickness after rough rolling is 18mm, the finish rolling start temperature is 1050°C, the finish rolling finish temperature is 890°C, and continuous cooling is adopted after the finish rolling , the cooling rate is 30°C / s, and the coiling temperature is 690°C. At this time, the structure of the hot-rolled sheet is ferrite + pearlite, and the thickness of the hot-rolled sheet is 3.0mm. The cold-rolling process is as follows: the hot-rolled plate is pickled and then cold-rolled with a reduction ratio ...

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Abstract

The invention relates to the field of third-generation advanced high-strength steel used for automobiles and discloses 1180 MPa-grade ultrahigh-strength low-cost cold-rolled quenched partition steel and a manufacturing method thereof. A steel plate comprises the chemical components including, by mass percent, 0.18-0.22% of C, 1.0-3.0% of Mn, 1.0-2.0% of Si, not greater than 0.05% of P, not greaterthan 0.02% of S, 0-0.05% of Nb, 0-0.2% of Ti and the balance iron and inevitable impurities. The steel plate manufacturing method relates to the process of steel smelting, hot rolling, cold rolling,pre-quenching and heat treatment, and finally, a ferrite-bainite-martensite-retained austenite mixed structure is obtained. According to the 1180 MPa-grade ultrahigh-strength low-cost cold-rolled quenched partition steel and the manufacturing method thereof, on the basis of traditional C-Mn-Si series quenched partition steel, Nb and Ti elements are added for refining the structure, pre-quenching treatment and a one-step partition process are adopted, finally the ultrahigh-strength quenched partition steel with the yield strength being 500-800 MPa, the tensile strength not smaller than 1180 MPa, the elongation after fracture not smaller than 20% and the product of strength and elongation not smaller than 24GPa.% is obtained, and the mechanical property is quite excellent.

Description

technical field [0001] The invention relates to the field of third-generation advanced high-strength steel for automobiles, in particular to a 1180MPa-level ultra-high-strength low-cost cold-rolled quenching-distribution steel and a manufacturing method thereof. Background technique [0002] Since the beginning of the 21st century, the annual output of automobiles in China has continued to grow, and there is a continuing upward trend. At the same time, people's demands on the automotive industry are getting higher and higher. As global oil prices continue to rise, automobile lightweight has become an inevitable trend in the development of the industry. For this reason, advanced high-strength steel has attracted more and more attention. The first generation of advanced high-strength steels, mainly consisting of dual-phase (DP) steel, complex-phase (CP) steel, and phase transformation-induced plasticity (TRIP) steel, etc., can only Simply achieving high strength or high plas...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/12C22C38/14C21D8/02C22C33/04
CPCC21D8/0205C21D8/0226C21D8/0236C21D8/0247C21D2211/001C21D2211/002C21D2211/005C21D2211/008C22C33/04C22C38/04C22C38/12C22C38/14
Inventor 许云波王源顾兴利彭飞卢兵李佳彧刘训达
Owner NORTHEASTERN UNIV
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