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Niobium-titanium composite-strengthened alloyed-coated steel sheet for hot pressing and its manufacturing method

A hot-press forming and strengthening alloy technology, which is applied in hot-dip plating process, metal material coating process, coating, etc., can solve the problem that it is difficult to take into account the mechanical properties of the steel plate and the quality of the coating at the same time

Active Publication Date: 2019-07-16
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aforementioned existing technologies are difficult to take into account both the mechanical properties of the steel plate and the quality of the coating

Method used

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  • Niobium-titanium composite-strengthened alloyed-coated steel sheet for hot pressing and its manufacturing method
  • Niobium-titanium composite-strengthened alloyed-coated steel sheet for hot pressing and its manufacturing method
  • Niobium-titanium composite-strengthened alloyed-coated steel sheet for hot pressing and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A niobium-titanium composite strengthened alloyed coated steel plate for hot pressing, the composition and weight percentage of the steel substrate are: C: 0.25%, Si: 0.4%, Mn: 1.3%, Cr: 0.4%, B: 0.0029%, Ti : 0.027%, Nb: 0.028%, the remainder is Fe and unavoidable impurities. The chemical composition weight percent of the coating is: Fe: 10.2%, the rest are Al, Zn and unavoidable impurities.

[0041] The production steps of coated steel plate are as follows:

[0042] 1) According to the chemical composition of the steel plate, it is smelted and continuously cast into billets;

[0043] 2) Hot continuous rolling controls the final rolling temperature to 897°C, the total reduction rate to 95%, and the coiling temperature to 710°C;

[0044] 3) The total reduction ratio of cold rolling control is 59%;

[0045] 4) Heating the dew point of the steel strip at -30°C to 840°C, H 2 The volume percentage does not exceed 5%. Cool to 475°C at a cooling rate of 30°C / s, hold for 2...

Embodiment 2

[0050] A niobium-titanium composite strengthened alloyed coated steel sheet for hot pressing, the components and weight percentages are: C: 0.25%, Si: 0.25%, Mn: 1.35%, Cr: 0.4%, B: 0.0031%, Ti: 0.034%, Nb: 0.025%, the remainder is Fe and unavoidable impurities. The chemical composition weight percent of the coating is: Fe: 11.4%, the rest are Al, Zn and unavoidable impurities.

[0051] The production steps of coated steel plate are as follows:

[0052] 1) Smelting and continuous casting into billets according to the chemical composition;

[0053] 2) Hot continuous rolling controls the final rolling temperature to 884°C, the total reduction rate to 84%, and the coiling temperature to 703°C;

[0054] 3) The total reduction rate of cold rolling control is 64%;

[0055] 4) Heating the dew point of the steel strip at -30°C to 820°C, H 2 The volume percentage does not exceed 7%. Cool to 490°C at a cooling rate of 25°C / s, hold for 20s, and then immerse into the plating solution....

Embodiment 3

[0060] A niobium-titanium composite strengthened alloyed coated steel sheet for hot pressing, the components and weight percentages are: C: 0.3%, Si: 0.35%, Mn: 1.8%, Cr: 0.4%, B: 0.005%, Ti: 0.059%, Nb: 0.035%, the remainder is Fe and unavoidable impurities. The weight percentage of the chemical composition of the coating is: Fe: 9.8%, and the rest are Al, Zn and unavoidable impurities.

[0061] The production steps of coated steel plate are as follows:

[0062] 1) Smelting and continuous casting into billets according to the chemical composition;

[0063] 2) Hot continuous rolling controls the final rolling temperature to 868°C, the total reduction rate to 91%, and the coiling temperature to 681°C;

[0064] 3) The total reduction ratio of cold rolling control is 61%;

[0065] 4) Heat the steel strip at -10°C dew point to 800°C, please H 2 The volume percentage does not exceed 15%, cool to 486°C at a cooling rate of 35°C / s, hold for 20s, and then immerse into the plating ...

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Abstract

The invention discloses a niobium titanium composite reinforced alloying clad steel plate for hot press molding. The steel plate comprises the following chemical components, by weight percentage, 0.14-0.4% of C, 0.1-0.4% of Si, 0.8-2.0% of Mn, 0.1-0.8% of Cr, 0.002-0.01% of B, 0.01-0.1% of Ti, 0.01-0.05% of Nb, smaller than or equal to 0.08% of Al, smaller than or equal to 0.005% of N, and the balance Fe and inevitable impurities. A clad layer comprises the following components, by weight percentage, 0.1-0.2% of Al, 5-14% of Fe and the balance Zn and inevitable impurities. According to the manufactured niobium titanium composite reinforced alloying clad steel plate for hot press molding, on the premise of meeting the requirements that the extension strength obtained after hot press molding is 1300-1500 MPa and the fracture elongation rate is larger than 5%, after high-temperature heating and punch forming, the clad layer is continuous and complete, and cracks extending to a base body are avoided. Two-phase tissue gamma-Fe4Zn9 (30Zn-70Fe) and alpha-Fe(Zn)(80Zn-20Fe) are formed in an alloy phase of the clad layer, the whole content of Zn in the alloy phase is higher than 30%, and corrosion resistance of the clad layer is very excellent. The steel can meet the requirement for light weight of anti-corrosion high-strength car plates.

Description

technical field [0001] The invention relates to metallurgical technology, in particular to a niobium-titanium composite strengthened alloyed coating steel plate for hot pressing and a manufacturing method thereof. Background technique [0002] Thermoformed steel has high tensile strength after high-temperature heating and forming, and has good formability at high temperature. It can form complex shapes and ultra-high-strength parts. It has the advantages of precise forming, good weldability, and no springback. Hot-formed steel, as the steel with the highest strength level among automotive steels, is widely used in anti-collision safety components of automobiles. Hot stamping of uncoated steel sheets was first applied to auto parts by Swedish HARDTECH (now GESTAMP-HARDTECH). In order to improve the corrosion resistance of steel sheets, hot-dip Al-Si coatings, hot-dip pure zinc (GI), electro-galvanized nickel (Zn-10Ni) and Al-X coated steel sheets have also been developed. H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/38C22C38/32C22C38/28C22C38/26C22C38/06C22C18/00C21D8/02C23C2/06C23C2/40
CPCC21D8/0226C21D8/0236C21D2211/008C22C18/00C22C38/001C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C22C38/32C22C38/38C23C2/06C23C2/40
Inventor 方芳葛锐胡宽辉杜小峰冯冠文周少云陈寅
Owner 武汉钢铁有限公司
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