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Cold-rolled TRIP steel at over 1000 MPa and preparation method thereof

A production method and technology for strip steel, which can be applied to manufacturing tools, heat treatment equipment, furnace types, etc., can solve unrealistic problems, and achieve the effect of reducing the weight of automobiles, improving strength and plasticity, and improving strength and elongation.

Active Publication Date: 2013-08-14
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is not practical for the high-speed air blowing cooling continuous annealing production line commonly used at present.

Method used

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  • Cold-rolled TRIP steel at over 1000 MPa and preparation method thereof

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Embodiment

[0044] Using the production method provided by the invention for smelting, the weight percentages of the target chemical components at the smelting end point are: C: 0.2%, S: 0.005%, P: 0.008%; the target temperature at the end point of the first furnace during the smelting process is 1670-1690 ℃; the target temperature of continuous pouring in the smelting process is 1660-1680 ℃; Al-Fe deoxidation is used in the smelting process, and the addition amount of Al-Fe is 4kg / t; In the early stage of steel, the slag was added along with the steel flow, and all the slag was added before the tapping amount reached 1 / 5, 800 kg of small-grained lime and 200 kg of fluorite per furnace; after that, Si-Mn was used to adjust Si so that the mass percentage of Si was 1.55% use Al-Fe to adjust Al, so that the mass percentage of Al is 1%, and use micro-carbon Mn-Fe to adjust Mn, so that the mass percentage of Mn is 2.2%; during the smelting process, the amount of slag after tapping is ≤ 80mm, t...

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Abstract

The invention discloses cold-rolled TRIP steel at over 1000 MPa and a preparation method thereof, and belongs to the technical field of high-strength high-plasticity cold-rolled steel. The weight percentage of chemical components of the cold-rolled TRIP steel is respectively as follows: by weight, 0.18-0.23% of C, 1.3-1.6% of Si, 2.1-2.3% of Mn, 0.03-0.05% of Nb, 0.03-0.09% of V, P being less than or equal to 0.01%, S being less than or equal to 0.01%, 0.8-1.2% of Alt, N being less than or equal to 0.005%, and the balance being F and impurities. The production method of the cold-rolled TRIP steel comprises steps of smelting, hot rolling, cold rolling and continuous annealing. The cold-rolled TRIP steel provided by the invention has high strength and strong plasticity. When applied in automobiles, the cold-rolled TRIP steel is in favor of reducing the automobile weight.

Description

technical field [0001] The invention relates to the technical field of high-strength and high-plasticity cold-rolled steel, in particular to a cold-rolled TRIP steel above 1000 MPa and a preparation method thereof. Background technique [0002] Cold-rolled TRIP steel needs to heat the steel strip to the ferritic-austenite two-phase region through continuous annealing. In the subsequent aging period (bainite treatment), part of the austenite is transformed into bainite and enriched with carbon. prepared in the remaining austenite. The use of early TRIP steels was limited because they contained more expensive alloying elements such as Ni and Cr. C and Mn elements are important elements to stabilize austenite and improve the strength of TRIP steel, so high-strength TRIP steel can also be prepared by adding high content of C and Mn. However, this will inevitably bring adverse effects, and the high carbon equivalent will affect the welding performance and elongation. However,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21C7/06C21D8/02C21D1/26C21D9/52
Inventor 姜英花邝霜熊爱明朱国森
Owner SHOUGANG CORPORATION