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Cold-rolled steel sheet for thermoforming excellent in corrosion resistance and spot weldability, thermoformed part, and manufacturing method thereof

A technology for cold-rolled steel sheets and manufacturing methods, applied in the directions of manufacturing tools, metal rolling, furnace types, etc., can solve the problems of difficulty in ensuring corrosion resistance, reducing economy and productivity, and inability to ensure spot weldability, etc., to achieve excellent Effects of corrosion resistance and spot weldability

Active Publication Date: 2021-09-03
浦项控股股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, since an Al-Si plating layer needs to be formed, an additional plating process is required, thereby reducing economy and productivity
[0006] On the other hand, for non-plated materials, spot weldability cannot be ensured due to an oxide layer generated during heat treatment, and a shot blast process for removing the oxide layer is required, and it is difficult to ensure corrosion resistance sex

Method used

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  • Cold-rolled steel sheet for thermoforming excellent in corrosion resistance and spot weldability, thermoformed part, and manufacturing method thereof
  • Cold-rolled steel sheet for thermoforming excellent in corrosion resistance and spot weldability, thermoformed part, and manufacturing method thereof
  • Cold-rolled steel sheet for thermoforming excellent in corrosion resistance and spot weldability, thermoformed part, and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0146] A slab having a thickness of 40 mm having the composition shown in the following Table 1 was vacuum-dissolved, heated in a heating furnace at 1200° C. for 1 hour, and then finish-rolled at a finish rolling temperature of 900° C. to produce a final thickness of 3 mm. hot-rolled steel plate. The hot-rolled steel sheet was coiled at 600°C. Next, after pickling the hot rolled steel sheet, cold rolling was performed at a cold rolling reduction of 50%.

[0147] As shown in Table 2 below, using the cold-rolled steel sheets manufactured as described above, continuous annealing was performed at an annealing temperature of 780° C. and different dew point temperature conditions (DP(I)). The thicknesses of the Si amorphous oxide layer and the (Fe, Mn, Cr) oxide layer on the surface of the cold-rolled steel sheet were measured after continuous annealing, and are listed in Table 2. In addition, the values ​​of the following formula (1) to formula (3) were calculated and described i...

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Abstract

One aspect of the present invention relates to a cold-rolled steel sheet for thermoforming with excellent corrosion resistance and spot weldability. The cold-rolled steel sheet contains, by weight %: C: 0.1-0.4%, Si: 0.5-2.0% , Mn: 0.01 to 4.0%, Al: 0.001 to 0.4%, P: 0.001 to 0.05%, S: 0.0001 to 0.02%, Cr: 0.5% to less than 3.0%, N: 0.001 to 0.02%, and Fe in the balance and other unavoidable impurities, and satisfy the following formula (1), a Si amorphous oxide layer with a thickness of 1 nm to 100 nm is continuously or discontinuously formed on the surface. Formula (1): 1.4≤0.4*Cr+Si≤3.2, the symbol of each element in the formula (1) represents the value measured by weight % to measure the content of each element.

Description

technical field [0001] The present invention relates to a cold-rolled steel sheet for thermoforming excellent in corrosion resistance and spot weldability, a thermoformed part, and a manufacturing method thereof. Background technique [0002] In recent years, parts manufactured by thermoforming have been widely used in structural parts of vehicles to improve fuel efficiency through vehicle weight reduction and to improve crashworthiness through ultra-high strength, and a lot of research has been conducted on this. [0003] The invention proposed in patent document 1 is mentioned as a typical technique. [0004] Patent Document 1 proposes that after heating an Al-Si plated steel sheet to 850°C or higher, the structure of the part is formed into martensite by press hot forming and rapid cooling, thereby ensuring ultra-high strength with a tensile strength exceeding 1600 MPa . In addition, since the alloyed layer and diffusion layer are formed by the diffusion of Fe from the ...

Claims

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Application Information

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IPC IPC(8): C21D8/02C21D9/56C22C38/38C22C38/04C22C38/02C22C38/06C22C38/00C22C38/34
CPCC21D8/0231C21D8/0236C21D8/0263C21D9/56C22C38/001C22C38/02C22C38/04C22C38/06C22C38/34C22C38/38C21D8/0273C22C38/00B21B3/02B21D22/022C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0247C21D9/46C21D2211/003C21D2211/005C22C38/002C22C38/008C22C38/20C22C38/22C22C38/24C22C38/26C22C38/50C22C38/54
Inventor 吴振根赵悦来赵雅拉车震镐许时鸣徐廷源金圣祐
Owner 浦项控股股份有限公司
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