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A preparation method of 2000mpa grade ultra-high strength trip steel

An ultra-high-strength, high-level technology, applied in the direction of process efficiency improvement, furnace, electric furnace, etc., can solve the problems of high cost, complex manufacturing process, etc., achieve high heating efficiency, good mechanical properties, and enhance the effect of TRIP effect

Active Publication Date: 2021-02-12
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, 2000MPa grade steel has been applied in the fields of protection, wear resistance, and automotive hot-formed parts, but it generally has the disadvantages of high cost and complicated manufacturing process when ensuring mechanical properties

Method used

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  • A preparation method of 2000mpa grade ultra-high strength trip steel
  • A preparation method of 2000mpa grade ultra-high strength trip steel
  • A preparation method of 2000mpa grade ultra-high strength trip steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The chemical composition and mass percentage of TRIP steel are as follows: carbon C: 0.22%, manganese Mn: 11.47%, aluminum Al: 1.95%, and the balance is Fe and unavoidable impurities.

[0035] The preparation method of the 2000MPa grade ultra-high strength TRIP steel of the present embodiment is carried out as follows:

[0036] (1) According to the chemical composition of the steel, it is added to the vacuum induction furnace, and the temperature of the melting furnace is raised to 1550 ° C ~ 1650 ° C. The smelted molten steel is then cast into ingots.

[0037] (2) Heat the ingot at 1200°C for 2 hours to homogenize the structure, then forge the ingot into a slab with a thickness of 18-22mm, and then air-cool it.

[0038] (3) The air-cooled slab is subjected to microstructure homogenization treatment at 1150° C., the holding time is 2 hours, and then hot-rolled to obtain a hot-rolled plate. The hot-rolled passes are 7 to 8 times, and the plate thickness after rolling is...

Embodiment 2

[0045] The chemical composition and mass percentage of the steel are as follows: C: 0.22%, Mn: 11.47%, Al: 1.95%, and the balance is Fe and unavoidable impurities.

[0046] The preparation method of the 2000MPa grade ultra-high strength TRIP steel of the present embodiment is carried out as follows:

[0047] (1) According to the chemical composition of the steel, it is added to the vacuum induction furnace, and the temperature of the melting furnace is raised to 1550 ° C ~ 1650 ° C. The smelted molten steel is then cast into ingots.

[0048] (2) Heat the ingot at 1200°C for 2 hours to homogenize the structure, then forge the ingot into a slab with a thickness of 18-22mm, and then air-cool it.

[0049] (3) The air-cooled slab is subjected to microstructure homogenization treatment at 1150° C., the holding time is 2 hours, and then hot-rolled to obtain a hot-rolled plate. The hot-rolled passes are 7 to 8 times, and the plate thickness after rolling is 5mm, cooled to room tempe...

Embodiment 3

[0056] The chemical composition and mass percentage of the steel are as follows: C: 0.40%, Mn: 11.46%, Al: 1.93%, and the balance is Fe and unavoidable impurities.

[0057] The preparation method of the 2000MPa grade ultra-high strength TRIP steel of the present embodiment is carried out as follows:

[0058] (1) According to the chemical composition of the steel, it is added to the vacuum induction furnace, and the temperature of the melting furnace is raised to 1550 ° C ~ 1650 ° C.

[0059] The smelted molten steel is then cast into ingots.

[0060] (2) Heat the ingot at 1200°C for 2 hours to homogenize the structure, then forge the ingot into a slab with a thickness of 18-22mm, and then air-cool it.

[0061] (3) The air-cooled slab is subjected to microstructure homogenization treatment at 1150° C., the holding time is 2 hours, and then hot-rolled to obtain a hot-rolled plate. The hot-rolled passes are 7 to 8 times, and the plate thickness after rolling is 5mm, cooled to r...

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Abstract

The invention relates to a preparation method of 2000MPa ultra-high-strength TRIP steel, comprising the following steps, the smelting step: smelting according to the chemical composition of the TRIP steel, and casting into an ingot, wherein the TRIP steel mainly contains Fe, C, Mn and Al element; forging step: first keep warm for 2±0.5 hours in the temperature range of 1150°C to 1250°C to homogenize the structure, then forge the ingot into a slab and air cool; hot rolling step: heat the slab at 1120°C to 1180°C The tissue homogenization treatment is carried out at ℃, the holding time is 2±0.5 hours, and then hot-rolled to obtain a hot-rolled sheet, which is cooled to room temperature by air cooling; the warm-rolling step: the second tissue homogenization treatment is carried out, and the hot-rolled sheet is heated to 600°C-650°C and keep it warm for 2±0.5 hours, and carry out warm rolling at 600°C-650°C, and air-cool to room temperature; Rolling plate; annealing treatment step: heat the obtained cold-rolled plate at 400° C. to 450° C. for at least 5 minutes.

Description

technical field [0001] The invention relates to the technical field of high-strength steel, in particular to a preparation method of 2000MPa-level ultra-high-strength TRIP steel. Background technique [0002] Since entering the 21st century, my country's steel manufacturing industry is facing more and more severe challenges. As the pillar of the national economy, China's iron and steel industry is striding into a new stage of high-quality development. One of the important trends in the development of the iron and steel industry is to improve mechanical properties and promote lightweight. In terms of materials, the competition between steel and aluminum and magnesium alloys is becoming increasingly fierce. How to improve the performance of steel materials and reduce production costs has become a key research direction of the industry. [0003] TRIP steel, Transformation Induced Plasticity Steel (Transformation Induced Plasticity Steel), is a high-strength, high-plasticity st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C21D8/02C21D1/26C21C5/52
CPCC21C5/5241C21D1/26C21D8/0226C21D2211/001C22C38/002C22C38/04C22C38/06Y02P10/20
Inventor 吴志强周洪刚黄浩肖大恒吴存慧蔡志华席守军卢立伟刘龙飞
Owner HUNAN UNIV OF SCI & TECH