Ultra-low carbon easy-to-weld medium manganese automotive steel with controllable yield ratio and preparation method thereof

An ultra-low-carbon, easy-to-weld technology, applied in the field of automotive steel, can solve problems such as increasing the difficulty of welding, and achieve the effects of avoiding the formation of hard and brittle phases, improving strong plasticity, and facilitating industrial production

Active Publication Date: 2019-12-20
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the third generation of medium-manganese automotive steel mainly adopts the design concept of low-carbon (0.1%-0.2%) composition. The addition of medium-manganese increases the welding carbon equivalent and increases the difficulty of welding.

Method used

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  • Ultra-low carbon easy-to-weld medium manganese automotive steel with controllable yield ratio and preparation method thereof
  • Ultra-low carbon easy-to-weld medium manganese automotive steel with controllable yield ratio and preparation method thereof
  • Ultra-low carbon easy-to-weld medium manganese automotive steel with controllable yield ratio and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation thickness is 0.5mm ultra-low carbon easy-to-weld medium manganese automobile steel plate, such as figure 1 As shown, the process steps are as follows:

[0037] (1) hot rolling treatment

[0038] The alloy billet is heated to 1000°C with the furnace and kept for 3 hours. The chemical composition of the alloy billet by weight percentage is: C: 0.02%, Mn: 8.5%, Si: 0.10%, S: 0.003%, P: 0.002%, Al: 0.05%, Cu: 0.30%, Ni: 0.20%, Mo: 0.16%, Cr: 0.02%, the balance is Fe and other unavoidable impurities; followed by 6 passes of hot rolling into a 2.7mm thick hot rolled sheet, The starting rolling temperature and finishing rolling temperature are 950°C and 850°C respectively, and after the hot rolling is finished, the cooling rate is 10°C / s and cooled to room temperature to obtain lath martensitic structure with high dislocation density;

[0039] (2) Stress relief tempering treatment

[0040] After the heating furnace is heated to 650°C, put the hot-rolled and quen...

Embodiment 2

[0046] Preparation thickness is 1.0mm ultra-low carbon easy-to-weld medium manganese automobile steel plate, such as figure 1 As shown, the process steps are as follows:

[0047] (1) hot rolling treatment

[0048] The alloy billet is heated to 1200°C with the furnace and kept for 3 hours. The chemical composition of the alloy billet by weight percentage is: C: 0.04%, Mn: 5.5%, Si: 0.25%, S: 0.003%, P: 0.002%, Al: 0.03%, Cu: 0.25%, Ni: 0.30%, Mo: 0.20%, Cr: 0.30%, the balance is Fe and other unavoidable impurities; followed by 6 passes of hot rolling into a 3.2mm thick hot rolled sheet, The starting and finishing temperatures are 1000°C and 900°C, respectively. After hot rolling, the cooling rate is 25°C / s to room temperature, and finally a lath martensitic structure with high dislocation density is obtained;

[0049] (2) Stress relief tempering treatment

[0050] After the heating furnace is heated to 670°C, the hot-rolled and quenched steel plate is put into the furnace fo...

Embodiment 3

[0056] Preparation thickness is 1.5mm ultra-low carbon easy-to-weld medium manganese automobile steel plate, such as figure 1 As shown, the process steps are as follows:

[0057] (1) hot rolling treatment

[0058] The alloy billet is heated to 1150°C with the furnace and kept for 3 hours. The chemical composition of the alloy billet by weight percentage is: C: 0.06%, Mn: 3.5%, Si: 0.50%, S: 0.003%, P: 0.002%, Al: 0.01%, Cu: 0.02%, Ni: 0.02%, Mo: 0.02%, Cr: 0.40%, the balance is Fe and other unavoidable impurities; followed by 6 passes of hot rolling into a 4.0mm thick hot rolled sheet, The starting rolling temperature and the final rolling temperature are 960°C and 880°C respectively, and after the hot rolling is finished, the cooling rate is 20°C / s to room temperature, and finally a lath martensitic structure with high dislocation density is obtained;

[0059] (2) Stress relief tempering treatment

[0060] After the heating furnace is heated up to 660°C, put the hot-rolled...

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Abstract

The invention belongs to the technical field of automotive steels and particularly relates to ultra-low carbon easily-welded medium-manganese automotive steel with a controllable yield ratio and a preparation method of the automotive steel. A steel plate comprises the following chemical components of, in percentage by weight, 0.02-0.06% of C, 3.5-8.5% of Mn, 0.10-0.50% of Si, less than 0.01% of S, less than 0.01% of P, 0.01-0.05% of Al, 0.02-0.30% of Cu, 0.02-0.35% of Ni, 0.02-0.20% of Mo, 0.02-0.40% of Cr and the balance Fe and other inescapable impurities. The preparation method comprises the steps of hot rolling treatment, destressing tempering treatment, cold rolling treatment and two-phase annealing treatment. Tissues of an obtained steel plate are a temper recrystallization martensite and a submicron reverse transformed austenite, the yield strength is 700-850 MPa, and the strength of extension is 940-1120 MPa.

Description

technical field [0001] The invention belongs to the technical field of steel for automobiles, and in particular relates to an ultra-low carbon easy-to-weld medium-manganese steel for automobiles with a controllable yield ratio and a preparation method thereof. Background technique [0002] With the improvement of people's requirements for automobile lightweight and anti-collision safety, the steel used in automobiles continues to develop in the direction of high strength and high plasticity. According to research reports and related statistics, every 10% reduction in vehicle weight can reduce fuel consumption by 3% to 7%, and reduce CO 2 Emissions 13%. The development of advanced high-strength steel can improve the strength and safety of automobiles at the same time, and the lightweight of car bodies has become a key technical route to achieve the goal of energy saving and emission reduction. Dual-phase steel (DP) and transformation-induced plasticity steel (TRIP) are cons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/02C22C38/06C22C38/42C22C38/44C21D8/02C21D1/26
CPCC21D1/26C21D8/0226C21D8/0236C21D8/0273C21D2211/001C21D2211/008C22C38/02C22C38/06C22C38/42C22C38/44C22C38/58
Inventor 胡军张加美吴红艳杨丽娟孙国胜杜林秀
Owner NORTHEASTERN UNIV LIAONING
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