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Zinc-based coating thermoforming steel based on CSP process and preparation method thereof

A hot forming steel and hot forming technology, applied in coating, hot-dip coating process, metal material coating process, etc., can solve the problems of coating volatilization, coating Zn content reduction, adverse effects on weldability, etc., to improve corrosion resistance Effects of performance, transition time delay, stability improvement

Inactive Publication Date: 2018-12-07
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the heating temperature is too high (such as greater than 900 ° C) or the heating time is too long (such as greater than 5min), the surface of the coating Al 2 o 3 The layer is reduced, and there is a risk of volatilization of the coating
At this time, a thicker ZnO layer is formed on the surface of the coating, resulting in a decrease in the Zn content in the coating, reducing the corrosion resistance of the coating, and adversely affecting the subsequent weldability
[0005] Most hot-rolled steel substrates are hot-rolled steel strips. However, due to the existence of a certain oxide layer on the surface of hot-rolled steel strips, defects such as poor coatings will be caused; The complete austenitization process during the forming process will cause the austenite grains to be coarse, resulting in an increased probability of liquid-induced crack embrittlement (LME) defects in the strip during hot stamping
And the production cost of hot-rolled strip steel is relatively high

Method used

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  • Zinc-based coating thermoforming steel based on CSP process and preparation method thereof
  • Zinc-based coating thermoforming steel based on CSP process and preparation method thereof
  • Zinc-based coating thermoforming steel based on CSP process and preparation method thereof

Examples

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Effect test

Embodiment 1

[0040]A kind of preparation method based on the zinc base coating hot-formed steel of CSP flow process, the chemical composition and weight percent of described hot-formed steel are as shown in table 1, and described preparation method comprises the following steps:

[0041] (1) steelmaking;

[0042] (2) CSP continuous casting: dynamic light reduction is adopted, and electromagnetic stirring rollers are used at the same time to reduce component segregation and banded structure;

[0043] (3) CSP hot rolling: the furnace temperature is 1060°C, the final rolling temperature is 875°C, the coiling temperature is 605°C, and the hot rolling reduction rate is greater than 100%;

[0044] (4) pickling to remove the iron oxide scale produced in the hot rolling process;

[0045] (5) Cold rolling, cold rolling reduction ≥ 50%, the metallographic structure of the substrate obtained after cold rolling is as follows figure 1 As shown, its metallographic structure is ferrite + pearlite, and ...

Embodiment 2

[0058] A kind of preparation method based on the zinc base coating hot-formed steel of CSP flow process, the chemical composition and weight percent of described hot-formed steel are as shown in table 1, and described preparation method comprises the following steps:

[0059] (1) steelmaking;

[0060] (2) CSP continuous casting: dynamic light reduction is adopted, and electromagnetic stirring rollers are used at the same time to reduce component segregation and banded structure;

[0061] (3) CSP hot rolling: the furnace temperature is 1164°C, the final rolling temperature is 876°C, the coiling temperature is 652°C, and the hot rolling reduction rate is greater than 100%;

[0062] (4) pickling to remove the iron oxide scale produced in the hot rolling process;

[0063] (5) cold rolling, cold rolling reduction ≥ 50%, the metallographic structure of the substrate obtained after cold rolling is ferrite + pearlite, and the grain size is 12 microns; the thickness of the substrate o...

Embodiment 3

[0068] A kind of preparation method based on the zinc base coating hot-formed steel of CSP flow process, the chemical composition and weight percent of described hot-formed steel are as shown in table 1, and described preparation method comprises the following steps:

[0069] (1) steelmaking;

[0070] (2) CSP continuous casting: dynamic light reduction is adopted, and electromagnetic stirring rollers are used at the same time to reduce component segregation and banded structure;

[0071] (3) CSP hot rolling: the furnace temperature is 1235°C, the final rolling temperature is 874°C, the coiling temperature is 632°C, and the hot rolling reduction rate is greater than 100%;

[0072] (4) pickling to remove the iron oxide scale produced in the hot rolling process;

[0073] (5) cold rolling, cold rolling reduction ≥ 50%, the metallographic structure of the substrate obtained after cold rolling is ferrite + pearlite, and the grain size is 12 microns; the thickness of the substrate o...

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Abstract

The invention discloses zinc-based coating thermoforming steel based on a CSP process and a preparation method thereof. The method comprises the following steps of (1) steelmaking; (2) CSP continuouscasting; (3) CSP hot rolling; (4) acid pickling; (5) cold rolling; (6) hot dip galvanizing; and (7) thermoforming. A steel plate comprises the following chemical components of, by weight, 0.10-0.4 ofC, 0.10-0.50 of Si, 0.50-3.50 of Mn, less than or equal to 0.03 of P, less than or equal to 0.03 of S, less than or equal to 0.10 of Al, 0.10-2.50 of Cr, 0.10-2.50 of Ni, less than or equal to 0.03 ofMo, 0.0004-0.01 of B, less than or equal to 0.01 of N, 0.01-0.10 of Ti, the balance Fe, and inevitable impurities. A thermoforming substrate is produced by using the CSP process in a low-cost manner,and a zinc liquid component containing the Al, the Mg and REM elements is coated on the substrate to form a coating layer; the coating which is subjected to thermoforming is good in corrosion resistance, volatilization and oxidation of the zinc can be well prevented, and an oxidation layer is good in adhesiveness during the thermoforming process.

Description

technical field [0001] The invention belongs to the technical field of hot-formed steel, and in particular relates to a zinc-based coated hot-formed steel based on a CSP process and a preparation method thereof. Background technique [0002] With the rapid development of the automobile industry, countries all over the world have increasingly stringent requirements on automobile safety, energy saving and emission. The use of hot forming technology to produce ultra-high-strength steel can not only reduce the weight of automobiles, realize energy saving and emission reduction, but also improve the safety of automobiles. This technology divides forming and strengthening into two steps, a new process for producing ultra-high-strength auto parts. It has the advantages of ultra-high strength, high forming precision, and avoiding springback of high-strength steel cold forming. However, during the hot forming and heating process of the steel plate, the surface of the steel plate is ...

Claims

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Application Information

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IPC IPC(8): C21D8/02C23C2/06C23C2/40C22C38/02C22C38/04C22C38/54C22C38/50C22C38/44C22C38/06
CPCC21D8/0205C21D8/0226C21D8/0236C21D2211/008C22C38/001C22C38/02C22C38/04C22C38/06C22C38/44C22C38/50C22C38/54C23C2/06C23C2/40
Inventor 崔磊晋家春周世龙王蕾
Owner MAANSHAN IRON & STEEL CO LTD
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