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Hot-dip galvanized steel sheet with superior bake hardenability and aging resistance, and manufacturing method thereof

A bake-hardening and hot-dip galvanizing technology, applied in hot-dip galvanizing process, manufacturing tools, heat treatment furnaces, etc., can solve the problems of increased manufacturing cost and difficulty in ensuring the quality of electroplating, and achieve excellent bake hardenability and aging resistance sexual effect

Inactive Publication Date: 2018-11-09
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology has problems in that it is difficult to ensure good plating quality due to the addition of a large amount of Si, and there is a problem of increased manufacturing costs due to the addition of a large amount of Ti and Mo

Method used

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  • Hot-dip galvanized steel sheet with superior bake hardenability and aging resistance, and manufacturing method thereof
  • Hot-dip galvanized steel sheet with superior bake hardenability and aging resistance, and manufacturing method thereof
  • Hot-dip galvanized steel sheet with superior bake hardenability and aging resistance, and manufacturing method thereof

Examples

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Embodiment

[0081] Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples only illustrate the present invention in more detail and do not limit the scope of the present invention.

[0082] After preparing slabs having the alloy compositions shown in Table 1 below, hot-dip galvanized steel sheets (GI steel sheets) or galvannealed steel sheets (GA steel sheets) were prepared using the manufacturing method described in Table 2 below. For reference, Inventive Steels 1, 2, 4, and 5 and Comparative Examples 1 and 2 correspond to alloyed hot-dip galvanized steel sheets, and Inventive Steels 3 and 6 correspond to hot-dip galvanized steel sheets in Table 1 below. At the same time, during the preparation of each sample, the end temperature of the first cooling was constantly set to 650°C, then the end temperature of the second cooling was constantly set to 560°C, and the end temperature of the third cooling was constant The ground is...

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Abstract

Disclosed are a cold-rolled steel sheet having excellent bake hardenability and aging resistance, and a manufacturing method thereof. The cold-rolled steel sheet comprises, by weight %, 0.02-0.08% ofC; 1.3-2.1% of Mn; 0.3% or less (excluding 0%) of Si; 1.0% or less (excluding 0%) of Cr; 0.1% or less (excluding 0%) of P; 0.01% or less (excluding 0%) of S; 0.01% or less (excluding 0%) of N; and 0.01-0.06% of sol.Al; at least one selected from the group consisting of 0.2% or less (excluding 0%) of Mo and 0.003% or less (excluding 0%) of B; and the balance being Fe and other inevitable impurities, wherein the steel sheet contains, as a microstructure thereof, 90-99% of ferrite and 1-10% of martensite in an area fraction,wherein a ratio (a / b) of an average carbon concentration a in the martensite and an average carbon concentration b in the ferrite located in an imaginary circle having a major axis of the martensite as a diameter, at a point of the sheet thickness of 1 / 4 t is 1.4 or less,and a ratio (d / c) of an average manganese concentration c in the martensite and an average manganese concentration d in the ferrite located in an imaginary circle having a major axis of the martensiteas a diameter, at a point of a sheet thickness of 1 / 4 t is 0.9 or less.

Description

technical field [0001] The present invention relates to a hot-dip zinc-coated steel sheet having excellent bake hardenability and aging resistance and a manufacturing method thereof, more particularly, to a hot-dip zinc-based steel sheet having excellent bake hardenability and aging resistance Zinc-coated steel sheet (preferably a material that can be used as an exterior automotive panel) and a method of manufacturing the same. Background technique [0002] Since impact stability regulations and fuel efficiency of automobiles are emphasized, high-strength steels are actively used to satisfy weight reduction and high strength requirements of automobile bodies. In line with this trend, the use of high-strength steel for exterior automotive panels has also expanded. [0003] At present, most of the 340MPa-grade bake-hardening steel has been used as exterior automotive panels, but some 490MPa-grade steel plates are also applied, and it is expected to expand to 590MPa-grade stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/22C22C38/32C22C38/38C22C38/00C22C38/02C22C38/06C22C38/04C23C2/06
CPCC23C2/06C22C38/02C22C38/04C22C38/06C22C38/18C22C38/22C22C38/32C22C38/38C21D6/002C21D6/005C21D6/008C21D8/0405C21D8/0426C21D8/0436C21D8/0473C21D9/48C22C38/001C21D2211/005C21D2211/008C21D8/0226C21D8/0236C21D8/0273C21D9/46C23C2/29C23C2/0224
Inventor 韩箱浩安衍相
Owner POHANG IRON & STEEL CO LTD
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