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
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[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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