Zinc-plated hot-formed steel plate or steel strip with excellent cold bending performance and manufacturing method thereof

A technology of cold bending performance and manufacturing method, which is applied in the direction of hot-dip plating process, coating, metal material coating process, etc., can solve the problems of increasing the friction coefficient between steel plate and mold, restricting production and use, and reducing the service life of mold

Inactive Publication Date: 2019-02-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the extensive application of hot stamping steel, the requirements for the collision performance of parts after hot stamping, such as cold bending performance and impact toughness, have also increased accordingly, and traditional hot stamping steel cannot meet the demand
[0003] In addition, during the heating process of traditional uncoated hot stamping parts, the surface of the stamped steel plate will be oxidized and

Method used

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  • Zinc-plated hot-formed steel plate or steel strip with excellent cold bending performance and manufacturing method thereof
  • Zinc-plated hot-formed steel plate or steel strip with excellent cold bending performance and manufacturing method thereof
  • Zinc-plated hot-formed steel plate or steel strip with excellent cold bending performance and manufacturing method thereof

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Embodiment Construction

[0064] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0065] Examples of the present invention refer to Table 1 and Table 2.

[0066] Steel plates 1-6 having the chemical compositions shown in Table 1 were melted and cast. These steel plates are heated to 1230°C for controlled rolling, the final rolling temperature is 900°C, and then a hot-rolled steel plate with a thickness of about 3mm is obtained at a coiling temperature of 600°C, and the hot-rolled steel plate is pickled and then cold-rolled to a thickness of 1.4mm. hard Board.

[0067] According to the conditions 1-6 in Table 2, recrystallize and anneal the above-mentioned hard-rolled sheets and hot-dip galvanize to obtain galvanized steel sheets, and then keep these steel sheets at 930°C for 4 minutes, and then send them to China according to the forming process in Table 2 Molded to B-pillar parts.

[0068] As can be seen from the results of compa...

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Abstract

The invention discloses a zinc-plated hot-formed steel plate or steel strip with excellent cold bending performance and a manufacturing method thereof. The zinc-plated hot-formed steel plate or steelstrip comprises a base plate with a surface decarburization layer thickness of 20 [mu]m or below and a zinc coating with an adhesion amount of 10-100 g/m<2> on the base plate. The constituent weight percentage of the base plate is C: 0.1-0.8%, Si: 0.05-2.0%, Mn: 0.5-3.0%, P: <=0.1%, S: <=0.05%, Al: <=0.1%, N: <=0.01%, and the balance Fe and unavoidable impurities. The average size of original austenite grains of the base plate is 15 [mu]m or below. The hot-formed steel plate or steel strip has a continuous and complete coating, no cracks extending to the base plate and excellent cold bending performance on the basis of meeting the conditions that the tensile strength of the base plate after hot-forming is 1500 MPa and the elongation after breaking is 5%.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a zinc-based coated thermoformed steel sheet or steel strip with excellent cold bending performance and a manufacturing method thereof, which are mainly used in the manufacture of structural components such as automobile B-pillars, door anti-collision beams, and bumpers. . Background technique [0002] The development trend of light weight, safety and low energy consumption of automobiles has promoted the development of high-strength steel plates. The use of advanced ultra-high-strength steel to replace traditional low-strength steel plates has become inevitable, and the use of high-strength steel plates can also significantly improve the crash safety of automobiles. However, with the improvement of the strength of the steel plate, the difficulty of processing the parts is also increasing. For the stamping forming process, thinning and high strength are the dual factors that dete...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/60C22C38/06C23C2/06C23C2/40C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0236C21D8/0273C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/60C23C2/06C23C2/40
Inventor 毕文珍洪继要王利
Owner BAOSHAN IRON & STEEL CO LTD
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