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Zinc-based plated steel sheet having excellent room temperature aging resistance and bake hardenability, and method for producing same

A baking hardening and time-sensitive technology, which is applied in chemical instruments and methods, manufacturing tools, hot-dip plating processes, etc., can solve the problems of increased manufacturing costs and difficulty in ensuring the quality of plating, and achieves excellent abnormal temperature resistance and aging resistance, excellent The effect of bake hardening

Active Publication Date: 2020-08-04
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 3, since a large amount of silicon (Si) is added, it is difficult to ensure excellent plating quality, and there is a problem of an excessive increase in manufacturing cost due to the addition of a large amount of titanium (Ti) and molybdenum (Mo).

Method used

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  • Zinc-based plated steel sheet having excellent room temperature aging resistance and bake hardenability, and method for producing same
  • Zinc-based plated steel sheet having excellent room temperature aging resistance and bake hardenability, and method for producing same
  • Zinc-based plated steel sheet having excellent room temperature aging resistance and bake hardenability, and method for producing same

Examples

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Embodiment Construction

[0132] Hereinafter, the present invention will be described more specifically by way of examples. However, it should be noted that the following examples are only for illustrating the present invention and are not intended to limit the scope of rights of the present invention.

[0133] Steel slabs having the alloy compositions described in Table 1 below were manufactured, and zinc-based plated steel sheet test pieces were manufactured by the manufacturing process described in Table 2 below. For reference, steel grades 1, 2, 4, and 5 in Table 1 below belong to alloyed hot-dip galvanized steel sheets (GA steel sheets), and steel grades 3 and 6 belong to hot-dip galvanized steel sheets. Steel grades 7 and 8 represent BH steels using conventional ultra-low carbon steels.

[0134] [Table 1]

[0135]

[0136] [Table 2]

[0137]

[0138]Using slabs having the compositions in Table 1, zinc-based alloy-plated steel sheet test pieces were produced under the conditions in Table ...

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Abstract

A zinc-based plated steel sheet having excellent room temperature aging resistance and bake hardenability according to an aspect of the present invention includes a base steel sheet and a zinc-based plating layer formed on the surface of the base steel sheet, wherein the base steel sheet contains, in wt%, no more than 0.005% (excluding 0%) of C, 0.1-1.0% of Mn, no more than 0.3% (excluding 0%) ofSi, 0.01-0.08% of P, no more than 0.01% of S, no more than 0.01% of N, 0.01-0.06% of sol.Al, 0.002-0.02% of Nb, and 0.001~0.004% (excluding 0.001%) of B, with the remainder comprising Fe and inevitable impurities, and CS in formula 1 below can satisfy the range of 0.0002-0.002%. In formula 1, [C] and [Nb] represent the contents (wt%) of C and Nb, respectively, in the base steel sheet. [Formula 1]CS = [C]-(12 / 93)*[Nb]

Description

technical field [0001] The present invention relates to a zinc-based coated steel sheet and a manufacturing method thereof, in detail, to a zinc-based coated steel sheet and a manufacturing method thereof, the zinc-based coated steel sheet has excellent room temperature aging resistance and baking Hardening, so it is especially suitable for use as the outer panel of the car. Background technique [0002] Materials used for automotive exterior panels require a certain level of bake hardenability and aging resistance. The bake hardening phenomenon refers to the phenomenon that the solid solution carbon and nitrogen activated during coating and baking are fixed on the dislocations formed during the processing of the steel plate, thereby increasing the yield strength of the steel plate. Steel with excellent bake hardenability has the characteristics that the steel sheet before coating and baking is easy to form, and the dent resistance of the final product is improved, so it ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C23C2/02C23C2/06C22C38/04C21D9/46C21D8/02
CPCC21D9/46C22C38/04C22C38/12C23C2/02C23C2/06C22C38/001C22C38/004C22C38/02C22C38/06C21D2211/005C21D8/0426C21D8/0436C21D8/0473B32B15/013C23C2/0224C21D8/0236C21D2211/004C21D8/0205C21D8/0226C22C38/002
Inventor 李济雄韩箱浩
Owner 浦项股份有限公司
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