Transformation induced plasticity steel and preparation method thereof

A transformation-induced plasticity, strip technology, applied in metal material coating process, hot dipping process, coating, etc.

Inactive Publication Date: 2012-10-24
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for the jet hot-dip galvanizing annealing production line t

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  • Transformation induced plasticity steel and preparation method thereof

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Effect test

Embodiment 1

[0028] A kind of phase transformation induced plasticity steel, its chemical composition weight percent is respectively:

[0029] C: 0.19%, Si: 0.5%, Mn: 1.9%, P: 0.008%, S: 0.005%, Alt: 0.9%, N: 0.005%, Nb: 0.03%, and the balance is Fe and impurities.

[0030] The preparation method of phase transformation induced plasticity steel in this embodiment specifically includes the following steps:

[0031] 1) Smelting: Add steel scrap to the converter for smelting. The end temperature of the first furnace during the smelting process is 1670-1690°C; the target temperature of the continuous pouring during the smelting process is 1660-1680°C; during the smelting process, Al-Fe alloy is used to resist Chemical powder deoxidation, the addition of Al-Fe alloy anti-chemical powder is 4kg / t; during the smelting process, slag is added during the tapping process, and the slag is added with the steel flow in the early stage of tapping, and the tapping amount reaches the total steel amount Be...

Embodiment 2

[0046] A kind of phase transformation induced plasticity steel, its chemical composition weight percent is respectively:

[0047] C: 0.21%, Si: 0.6%, Mn: 2.0%, P: 0.01%, S: 0.01%, Alt: 0.8%, N: 0.0008%, Nb: 0.04%, and the balance is Fe and impurities.

[0048] The preparation method of phase transformation induced plasticity steel in this embodiment specifically includes the following steps:

[0049] 1) Smelting: Add steel scrap to the converter for smelting. The end point temperature of the first furnace during the smelting process is 1690°C; the target temperature at the end point of continuous casting during the smelting process is 1660°C; during the smelting process, Al-Fe is used for deoxidation. The addition amount is 4kg / t; during the smelting process, slag is added during the tapping process, and the slag is added along with the steel flow in the early stage of tapping, and all the slag is added before the tapping amount reaches 1 / 5 of the total steel amount, and every...

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Abstract

The invention discloses transformation induced plasticity steel and a preparation method thereof and belongs to the technical field of cold rolling hot galvanizing. The transformation induced plasticity steel comprises by mass, 0.18%-0.21% of carbon, 0.6%-10.5% of silicon, 1.8%-2.0% of manganese, 0.03%-0.04% of niobium, no more than 0.01% of phosphorus, no more than 0.01% of sulphur, 0.8%-1.0% of all aluminum, no more than 0.005% of nitrogen and the balance ferrum. Based on a producing method of conventional jet cooling hot galvanizing, the transformation induced plasticity steel and the preparation method are used in 780 MPa automobile cold rolling hot galvanizing, and the transformation induced plasticity steel not only can meet design strength and has good welding and plastic performances.

Description

technical field [0001] The invention belongs to the technical field of cold-rolling and hot-dip galvanizing, and relates to a phase transformation-induced plasticity steel and a preparation method thereof. Background technique [0002] In order to reduce fuel consumption and emission reduction, it is necessary to reduce the weight of automobiles. On the contrary, in order to improve automobile safety, it will be necessary to increase the quality of automobiles. An effective means to solve this contradiction is to use high-strength steel and advanced high-strength steel. On the other hand, the corrosion resistance of automobiles has also become an increasing requirement for high-end automobiles. [0003] The microstructure of Transformation Induced Plasticity Steel (TRIP) consists of ferrite, bainite, retained austenite and a small amount of martensite. TRIP steels have well-matched strength and ductility due to the TRIP effect. The TRIP effect is that the retained austenit...

Claims

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Application Information

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IPC IPC(8): C22C38/12C21D8/02C23C2/40
Inventor 姜英花邝霜尉冬王海全滕华湘刘光明
Owner SHOUGANG CORPORATION
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