Cold-roll steel plate used for precise punching of automobile safety belt buckles and manufacturing method of precise punching cold-roll steel plate

A technology of cold-rolled steel plate and precision stamping, which is applied in the field of precision stamping cold-rolled steel plate for automobile seat belt buckle and its manufacture, and cold-rolled steel plate. It can solve the problems of high hardness, low elongation, and unsuitability for high-speed precision stamping. Achieve the effect of increasing heat treatment hardness, reducing strength, and moderate hardness

Active Publication Date: 2019-12-10
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a precision stamping cold-rolled steel plate for automobile seat belt buckle and its manufacturing method, to solve the problem of high hardness and low elongation of the existing cold-rolled steel plate for precision stamping automobile seat belt buckle, which is not suitable for high-speed precision stamping technical issues

Method used

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  • Cold-roll steel plate used for precise punching of automobile safety belt buckles and manufacturing method of precise punching cold-roll steel plate
  • Cold-roll steel plate used for precise punching of automobile safety belt buckles and manufacturing method of precise punching cold-roll steel plate
  • Cold-roll steel plate used for precise punching of automobile safety belt buckles and manufacturing method of precise punching cold-roll steel plate

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Embodiment Construction

[0043] Below in conjunction with embodiment 1-5 the present invention is further described, as shown in table 1-4.

[0044] Table 1 is the chemical composition (by weight percentage) of the steel of the embodiment of the present invention, and the balance is Fe and unavoidable impurities.

[0045] Table 1 Chemical composition of the steel of the embodiment of the present invention, unit: weight percent.

[0046] element C Si mn P S Cr Al this invention 0.56-0.64 ≤0.2 0.3-0.5 ≤0.015 ≤0.005 0.15-0.25 0.01-0.04 Example 1 0.582 0.176 0.356 0.0135 0.0030 0.19 0.025 Example 2 0.619 0.128 0.375 0.0101 0.0013 0.17 0.017 Example 3 0.603 0.102 0.332 0.0122 0.0019 0.22 0.036 Example 4 0.593 0.132 0.412 0.103 0.0026 0.196 0.023 Example 5 0.613 0.152 0.385 0.116 0.0010 0.179 0.019

[0047] The molten steel that meets the basic requirements of the chemical composition is obtained through converter...

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Abstract

The invention discloses a cold-roll steel plate used for precise punching of automobile safety belt buckles and a manufacturing method of the precise punching cold-roll steel plate. The technical problems that an existing cold-roll steel plate used for precise punching of automobile safety belt buckles is high in hardness, low in ductility and not suitable for high-speed precise punching are solved. The cold-roll steel plate used for precise punching of automobile safety belt buckles comprises the chemical components including, by weight, 0.56%-0.64% of C, smaller than or equal to 0.20% of Si,0.3%-0.5% of Mn, 0.01%-0.04% of Al, 0.15%-0.25% of Cr, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S and the balance Fe and inevitable impurities. The yield strength RP 0.2 of the cold-roll steel plate is 300 MPa to 350 MPa, and the after-fracture elongation A 50 mm is 32% to 38%. The cold-roll steel plate is used for high-speed precise punching manufacturing of components such as automobile safety belt buckles.

Description

technical field [0001] The invention relates to a cold-rolled steel plate for precise stamping, in particular to a precision stamped cold-rolled steel plate for automobile seat belt buckles and a manufacturing method thereof, belonging to the technical field of iron-based alloys. Background technique [0002] Due to the high content of carbon and alloy elements, high carbon steel generally has high hardness and wear resistance after heat treatment, and is widely used in the manufacture of machinery and auto parts. With the development of the fine blanking industry in recent years, it has become an inevitable trend for fine blanking to replace ordinary stamping. Compared with ordinary stamping, precision stamping parts have the characteristics of high precision, good interchangeability, high yield and high efficiency. [0003] However, the forming process of fine blanking is complex, and the requirements for the internal quality of the material are very high. In order to ac...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/06C22C38/02C22C38/18C21D8/02
CPCC22C38/04C22C38/06C22C38/02C22C38/18C21D8/0205C21D8/0226C21D8/0236C21D8/0273C21D2211/005C21D2211/009
Inventor 马植甄
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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