A kind of hot-rolled medium manganese trip steel containing trace zirconium and preparation method thereof

It is a technology of trace amount and excess amount, which is applied in the field of hot-rolled medium manganese TRIP steel and its preparation, which can solve the problems of limited application and popularization, increased cost, and deterioration of steel plate welding performance, and achieves the advantages of simple production process, simple composition and excellent welding performance. Effect

Active Publication Date: 2021-04-13
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the higher C content will cause the deterioration of the weldability of the steel plate, and the addition of higher Al will easily block the nozzle of the medium manganese steel during the pouring process, which is not conducive to continuous casting production and increases the cost, thus limiting the application and promotion of this steel type

Method used

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  • A kind of hot-rolled medium manganese trip steel containing trace zirconium and preparation method thereof
  • A kind of hot-rolled medium manganese trip steel containing trace zirconium and preparation method thereof
  • A kind of hot-rolled medium manganese trip steel containing trace zirconium and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A hot-rolled medium-manganese TRIP steel containing trace zirconium, the chemical composition is: C: 0.18%, Mn: 7.89%, Al: 1.51%, Zr: 0.11%, P<0.008%, S<0.008% , the balance being Fe.

[0034] The preparation method of TRIP steel comprises the following steps:

[0035] Smelting and forging: According to the alloy composition, the steel ingot is vacuum smelted, the riser is removed and the scale is turned off. The steel ingot is forged after being held at 1200°C for 2 hours, the final forging temperature is not lower than 900°C, then air-cooled to room temperature, and finally forged into a slab sample with a thickness of 30mm.

[0036] Hot rolling: heat the forged billet at 1200°C for 2 hours, then conduct multi-pass rolling to a thickness of 4mm, and the final rolling temperature is not lower than 850°C.

[0037] Two-phase zone annealing: the hot-rolled steel sheet was annealed at 680°C for 1 hour and then air-cooled to room temperature.

[0038] Low-temperature tem...

Embodiment 2

[0040] A hot-rolled medium-manganese TRIP steel containing trace amounts of zirconium, the chemical composition of which is: C: 0.18%, Mn: 8.1%, Al: 1.47%, Zr: 0.08%, P<0.008%, S<0.008% , the balance being Fe.

[0041] The preparation method of TRIP steel comprises the following steps:

[0042] Smelting and forging: According to the alloy composition, the steel ingot is vacuum smelted, the riser is removed and the scale is turned off. The steel ingot is forged after being held at 1200°C for 2 hours, the final forging temperature is not lower than 900°C, then air-cooled to room temperature, and finally forged into a slab sample with a thickness of 30mm.

[0043] Hot rolling: heat the forged billet at 1200°C for 2 hours, then conduct multi-pass rolling to a thickness of 4mm, and the final rolling temperature is not lower than 850°C.

[0044] Two-phase zone annealing: the hot-rolled steel sheet was annealed at 660°C for 1 hour, and then air-cooled to room temperature.

[0045]...

Embodiment 3

[0047] A hot-rolled medium-manganese TRIP steel containing trace zirconium, the chemical composition is: C: 0.2%, Mn: 7.91%, Al: 1.51%, Zr: 0.06%, P<0.008%, S<0.008% , the balance being Fe.

[0048] The preparation method of TRIP steel comprises the following steps:

[0049]Smelting and forging: According to the alloy composition, the steel ingot is vacuum smelted, the riser is removed and the scale is turned off. The steel ingot is forged after being held at 1200°C for 2 hours, the final forging temperature is not lower than 900°C, then air-cooled to room temperature, and finally forged into a slab sample with a thickness of 30mm.

[0050] Hot rolling: heat the forged billet at 1200°C for 2 hours, and then perform multi-pass rolling to a thickness of 5mm, and the final rolling temperature is not lower than 850°C.

[0051] Two-phase zone annealing: the hot-rolled steel plate was annealed at 670°C for 1 hour and then air-cooled to room temperature.

[0052] Low-temperature t...

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Abstract

The invention discloses a hot-rolled medium-manganese TRIP steel containing trace zirconium and a preparation method thereof. The chemical composition of the steel is: C: 0.18-0.2%, Mn: 7-9%, Al: 1.40-1.6%, Zr: 0.06 ~0.11%, P<0.008%, S<0.008%, the balance is Fe. The preparation method includes: smelting and forging, hot rolling, two-phase zone annealing and low temperature tempering. The advantages of the present invention are: 1. The tensile strength of TRIP steel can reach 1250MPa, the elongation rate can reach 50%, and the strong-plastic product can reach 63GP·% level, and its strength far exceeds the TWIP level of the second-generation automobile, and the strong-plastic product can reach its level. The same level; 2. The composition is simple, of which the content of C and Al is low, and the welding performance of the steel plate is excellent, and because of the low content of Al, it effectively avoids the problems of easy blockage of the nozzle during the pouring process, which is not conducive to continuous casting production; 3. Production The process is simple, and high strength and high plasticity can be obtained by annealing and low temperature tempering in the two-phase area for a short time after hot rolling, which is easy to realize in industrial production.

Description

technical field [0001] The invention relates to the technical field of advanced high-strength steel production, in particular to a hot-rolled medium-manganese TRIP steel containing a small amount of zirconium and a preparation method thereof. Background technique [0002] Today, safety, energy saving, and environmental protection are the three major themes of automobile technology, which have greatly promoted the research and development of body lightweight technology. The first generation of automotive steel, such as IF steel, DP steel, TRIP steel and martensitic steel, has a low strength-plastic product (the product of tensile strength and total elongation), which cannot adapt to the high strength and high plasticity of future automotive steel. and the development requirements of high safety performance; therefore, people have developed the second-generation automotive steel mainly TWIP steel, which has excellent plasticity and a strong-plastic product as high as 50-70GPa·...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/14C21D8/02C22C33/04
Inventor 张喜亮刘涛刘宏基周骞吕征赵雷杰崔好选
Owner HEBEI UNIV OF ENG
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