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Processing method for improving surface quality of TRIP steel

A processing method and technology of surface quality, applied in the processing field of improving the surface quality of TRIP steel, can solve problems such as the deterioration of coating performance of TRIP steel, and achieve the effects of improving surface quality, simple process and high industrial feasibility

Inactive Publication Date: 2015-11-18
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But high silicon content will make the coating performance of TRIP steel worse

Method used

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  • Processing method for improving surface quality of TRIP steel
  • Processing method for improving surface quality of TRIP steel
  • Processing method for improving surface quality of TRIP steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) According to weight percentage: C: 0.18%; Si: 0.3%; Mn: 1.56%; Al: 1.44%; Cr: 0.077%; P: 0.008%; S: 0.008%; To avoid the chemical composition of impurities, choose and match raw materials, use intermediate frequency vacuum induction furnace to smelt TRIP steel at 1500~1600℃, and then cast TRIP steel ingot into a steel plate with a thickness of 50mm; measure the steel plate A c1 is 790°C,A c3 It is 895°C.

[0038] (2) The TRIP steel plate is rolled to 4mm by using a two-roll reversing hot rolling mill. rolling to the target thickness;

[0039] (3) Roll the TRIP steel plate in step (2) to 1mm by using a four-roll irreversible cold rolling mill, the process parameters are: the reduction of each pass is 10-40%, and the target thickness is rolled to the target thickness after 10 passes;

[0040] (4) Anneal the high-alumina TRIP steel plate in step (3) in a box-type heating furnace. The process parameters are: the annealing temperature is 920°C, and the holding time i...

Embodiment 2

[0044] (1) According to weight percentage: C: 0.18%; Si: 0.3%; Mn: 1.56%; Al: 1.44%; Cr: 0.077%; P: 0.008%; S: 0.008%; To avoid the chemical composition of impurities, choose and match raw materials, use intermediate frequency vacuum induction furnace to smelt TRIP steel at 1500~1600℃, and then cast TRIP steel ingot into a steel plate with a thickness of 50mm; measure the steel plate A c1 is 790°C, A c3 It is 895°C.

[0045] (2) Roll the TRIP steel plate to 4mm by using a two-roll reversing hot rolling mill. The process parameters are: the heating temperature is 1200°C, the final rolling temperature is 950°C, and the pass reduction is 10-50%. After 7 passes rolling to the target thickness;

[0046] (3) Roll the TRIP steel plate in step (2) to 1mm by using a four-roll irreversible cold rolling mill, the process parameters are: the reduction of each pass is 10-40%, and the target thickness is rolled to the target thickness after 10 passes;

[0047] (4) Anneal the high-alumi...

Embodiment 3

[0051] (1) According to weight percentage: C: 0.2%; Si: 0.2%; Mn: 1.6%; Al: 1.6%; Cr: 0.07%; P: 0.01%; S: 0.009%; To avoid the chemical composition of impurities, choose and match raw materials, use intermediate frequency vacuum induction furnace to smelt TRIP steel at 1500~1600℃, and then cast TRIP steel ingot into a steel plate with a thickness of 50mm; measure the steel plate A c1 at 800°C, A c3 It is 910°C.

[0052] (2) Roll the TRIP steel plate to 4mm by using a two-roll reversing hot rolling mill. The process parameters are: the heating temperature is 1200°C, the final rolling temperature is 950°C, and the pass reduction is 10-50%. After 7 passes rolling to the target thickness;

[0053] (3) Roll the TRIP steel plate in step (2) to 1mm by using a four-roll irreversible cold rolling mill, the process parameters are: the reduction of each pass is 10-40%, and the target thickness is rolled to the target thickness after 10 passes;

[0054] (4) Anneal the high-alumina TR...

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Abstract

The invention provides a processing method for improving surface quality of TRIP steel, comprising the following steps: (1) preparing the TRIP steel from the following raw materials by weight percent: 0.10-0.25% of C, 1.0-4.0% of Mn, less than or equal to 0.5% of Si, 1.0-5.0% of Al, less than or equal to 0.1% of Cr, less than or equal to 0.01% of P, less than or equal to 0.01% of S, and the balance of Fe and inevitable impurities by virtue of smelting, and cogging the TRIP steel into a steel plate; (2) rolling the steel plate to the thickness of 4mm; (3) rolling the steel plate to the thickness of 1mm; (4) annealing the steel plate; and (5) performing isothermal quenching on the high aluminum TRIP steel plate obtained in the step (4). According to the scheme in the invention, by setting the annealing temperature of the high aluminum TRIP steel plate to be above Ac3 and below the liquidus temperature, the defect that the heat treatment temperature of conventional TRIP steel only can be limited between Ac1-Ac3, so as to cause a narrower annealing process window can be improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, and in particular relates to a processing method for improving the surface quality of TRIP steel. Background technique [0002] At present, automobiles are developing in the direction of lightweight, energy saving and low cost. The use of high-strength steel plates is the main measure taken by the automobile industry and the steel industry to deal with this trend. High-strength steel includes bake hardening steel (BH steel), high-strength low-alloy steel (HSLA steel), dual-phase steel (DP steel), complex-phase steel (CP steel), martensitic steel (M steel) and phase transformation Induced plasticity steel (TRIP steel), etc. Since TRIP steel has the advantages of high yield strength and tensile strength, strong ductility, and high stamping ability, it is considered to be a new generation of high-strength steel sheets for automobiles, and a lot of research and development work has b...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/38C22C38/06
Inventor 赵阳袁晓云闫述孙祥坤宋孟陈礼清刘相华闫强军
Owner NORTHEASTERN UNIV
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