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Economical high-aluminum and low-silicon TRIP steel for automobiles and preparation method of TRIP steel

A technology of elongation and mass percentage, which is applied in the field of economical high-aluminum low-silicon TRIP steel for automobiles and its preparation, can solve the problems of reduced solid solution strengthening effect, low steel strength, and unsatisfactory, and achieve high recycling rate of steel , low alloy composition and low cost

Active Publication Date: 2018-03-20
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For steel with this composition, since the Si element in TRIP steel is removed and replaced by Al, the solid solution strengthening effect is significantly reduced, and the steel strength produced is low, which cannot meet the requirements of the new generation of automotive steel.

Method used

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  • Economical high-aluminum and low-silicon TRIP steel for automobiles and preparation method of TRIP steel
  • Economical high-aluminum and low-silicon TRIP steel for automobiles and preparation method of TRIP steel
  • Economical high-aluminum and low-silicon TRIP steel for automobiles and preparation method of TRIP steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, the material is prepared according to the composition design ratio, and the vacuum induction furnace is melted and poured quickly at 1600 ° C. The actual mass percentage of the steel composition is: C: 0.19%, Si: 0.36%, Al: 1.59%, Mn: 1.57% , Cu: 0.37%, P: 0.004%, S: 0.0029%, and the balance is Fe, and then the ingot is heated to 1100°C and forged into a 60mm thick rectangular block. Heat the rectangular steel block to 1200°C for 2 hours, air-cool to 1050°C to start hot rolling, and measure the final rolling temperature to 780°C when it reaches a thickness of 6 mm, then air-cool to 550°C for coiling. The cold-rolled sheet is pickled and then cold-rolled, and the reduction is controlled at 70% to obtain a cold-rolled sheet with a thickness of 1.6 mm.

[0037] Next, the cold-rolled sheet after edge trimming is hydrogenated with 5% H 2 +N 2 Annealing was performed in a mixed atmosphere. First heat the cold-rolled sheet to 930°C, keep it warm for 60s, th...

Embodiment 2

[0039] In this example, the material is prepared according to the composition design. After melting in the vacuum induction furnace, it is quickly poured at 1620 ° C. The actual mass percentage of the steel composition is: C: 0.22%, Si: 0.43%, Al: 1.61%, Mn: 1.86% , Cu: 0.42%, P: 0.0072%, S: 0.0074%, and the balance is Fe, and then the ingot is heated to 1100°C and forged into a 60mm thick rectangular block. Heat the rectangular steel block to 1200°C for 1.5h, air-cool to 1100°C and start hot rolling. When the thickness reaches 6.2mm, the final rolling temperature is 800°C, and then air-cool to 560°C for coiling. The cold-rolled sheet is pickled and then cold-rolled, and the reduction is controlled at 70% to obtain a cold-rolled sheet with a thickness of 1.7 mm.

[0040] Next, the cold-rolled sheet after edge trimming is hydrogenated with 5% H 2 +N 2Annealing was performed in a mixed atmosphere. First heat the cold-rolled sheet to 950°C, keep it warm for 60s, cool it to 650...

Embodiment 3

[0042] In this example, the material is prepared according to the composition ratio, and the vacuum induction furnace is melted and poured quickly at 1650 ° C. The actual mass percentage of the steel composition is: C: 0.23%, Si: 0.43%, Al: 1.72%, Mn: 1.87% , Cu: 0.56%, P: 0.0064%, S: 0.0062%, and the balance is Fe, and then the ingot is heated to 1100°C and forged into a 60mm thick rectangular block. Heat the rectangular steel block to 1200°C for 1.5h, air-cool to 1030°C and start hot rolling. When the thickness reaches 6mm, the final rolling temperature is 770°C, and then air-cool to 530°C for coiling. The cold-rolled sheet is pickled and then cold-rolled, and the reduction is controlled at 70% to obtain a cold-rolled sheet with a thickness of 1.6 mm.

[0043] Next, the cold-rolled sheet after edge trimming is hydrogenated with 5% H 2 +N 2 Annealing was performed in a mixed atmosphere. First heat the cold-rolled sheet to 930°C, keep it warm for 60s, cool it to 650°C at a ...

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Abstract

The invention discloses economical high-aluminum and low-silicon TRIP high-strength steel for automobiles and a preparation method of the TRIP steel, and belongs to the technical field of production of high-strength steel for automobiles. The TRIP steel comprises the components of, by mass, 0.15-0.25% of C, 0.1-0.5% of Si, 1.5-3.0% of Al, 1.5-2.5% of Mn, 0.1-1.0% of Cu, 0.01% of P and Lt, 0.005% of S and Lt and the balance Fe. The preparation method comprises the following steps of smelting, pouring, forging, heat preservation, hot rolling, thatching, acid pickling, cold rolling and annealingtreatment. Micro-alloy elements contained in the steel are less, so that the steel is economical and beneficial for being recovered; Si is partially replaced by Al, the ductility is improved, and thegalvanization performance of a cold rolled steel plate is improved; a small quantity of Cu is added, the defect of Al at the aspect of strength is made up through solid solution and precipitation strengthening, and the extension strength is improved. By adopting annealing in a two-phase area and heat preservation in a bainite area in the heat treatment technology, a cold rolled plate with the extension strength being larger than 780 MPa, the ductility being over 25%, the maximum ductility reaching 30% and the plate shape and the surface quality being good is obtained. The temperature of the bainite area is higher than 460 DEG C so as to be matched with the galvanization technology to achieve integration of annealing and galvanization, and thus the high-strength galvanized plate for the automobiles is produced.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel production for automobiles, in particular to an economical high-aluminum low-silicon TRIP steel for automobiles and a preparation method thereof. Background technique [0002] Advanced continuous annealing and coating technology put forward requirements for the integrated microstructure and performance control of hot rolling-cooling-heat treatment: develop a new generation of controlled rolling and controlled cooling technology; establish a green hot-rolled steel composition and process system to achieve "resource saving" " and "process reduction"; 60-80% of the hot-rolled steel strength increased by 100-200MPa, or the main alloy elements were saved by 20-30%, the steel was saved by 5-10%, and the energy was saved by 10-15%. Low-carbon micro-alloy steel can adapt to continuous annealing and hot-dip galvanizing annealing. The new generation of high-strength TRIP steel has high strength,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/04C22C38/16C21D8/02C21D1/26C21D1/74
CPCC21D1/26C21D1/74C21D8/0226C21D8/0236C21D8/0273C21D2211/001C22C38/02C22C38/04C22C38/06C22C38/16Y02P10/20
Inventor 邸洪双黄慧强闫宁李洋郭晓妮邓永钢张洁岑
Owner NORTHEASTERN UNIV
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