High yield ratio, high strength electro-galvanized steel sheet, and manufacturing method thereof
A manufacturing method and electro-galvanizing technology, applied in the direction of manufacturing tools, circuits, electrical components, etc., can solve problems such as delayed damage
Active Publication Date: 2021-06-08
JFE STEEL CORP
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- Application Information
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Problems solved by technology
[0003] Delayed failure (hydrogen embrittlement) may occur as the strength of the steel plate increases
Method used
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[0128] The present invention will be specifically described with reference to examples.
[0129] 1. Manufacture of steel plates for evaluation
[0130] After the steel having the composition shown in Table 1 and the remainder consisting of Fe and unavoidable impurities was melted in a vacuum melting furnace, billet rolling was performed to obtain a billet-rolled material with a thickness of 27 mm. The obtained billet-rolled material was hot-rolled to a thickness of 4.0 mm to produce a hot-rolled steel sheet. Next, for the cold-rolled samples, the hot-rolled steel sheet was ground to a thickness of 3.2 mm, and then cold-rolled at the reduction ratios shown in Table 2-1 to Table 2-4 to a thickness of 2.72 to 0.96 mm. mm, to manufacture cold-rolled steel sheets. In addition, in Table 2-3, the numerical value which does not describe the rolling reduction of cold rolling means that cold rolling was not performed. Next, annealing and plating were performed on the hot-rolled steel...
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Abstract
An object is to provide a high-yield-ratio high-strength electrogalvanized steel sheet having excellent bendability and a method for manufacturing the steel sheet. The high-yield-ratio high-strength electrogalvanized steel sheet having an electrogalvanized coating layer formed on a surface of a base steel sheet, in which the base steel sheet has a chemical composition containing, by mass%, C: 0.14% or more and 0.40% or less, Si: 0.001% or more and 2.0% or less, Mn: 0.10% or more and 1.70% or less, P: 0.05% or less, S: 0.0050% or less, Al: 0.01% or more and 0.20% or less, N: 0.010% or less, and a balance of Fe and inevitable impurities, a steel microstructure, in which a total area fraction of one or both of bainite containing carbides having an average grain diameter of 50 nm or less and tempered martensite containing carbides having an average grain diameter of 50 nm or less is 90% or more in the whole of the steel microstructure, and in which a total area fraction of one or both of bainite containing carbides having an average grain diameter of 50 nm or less and tempered martensite containing carbides having an average grain diameter of 50 nm or less is 80% or more in a region from the surface of the base steel sheet to a position located at 1 / 8 of a thickness of the base steel sheet, and diffusible hydrogen in steel in an amount of 0.20 mass ppm or less.
Description
technical field [0001] The invention relates to a high-yield-ratio high-strength electro-galvanized steel sheet and a manufacturing method thereof. More specifically, the present invention relates to a high-yield ratio high-strength electrogalvanized steel sheet used for automobile parts and a method for producing the same, and more particularly to a high-yield ratio high-strength electrogalvanized steel sheet excellent in bendability and a method for manufacturing the same . Background technique [0002] In recent years, the trend of reducing the weight of the vehicle body itself has become more and more obvious, and the steel plates used in the vehicle body have been strengthened and thinned to achieve light weight. In particular, high-strength steel plates with a TS (tensile strength) of 1320-1470 MPa are used for car body frame parts such as center pillar R / F (reinforcement), bumpers, and crash beam parts (hereinafter also referred to as parts). However, from the viewp...
Claims
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IPC IPC(8): C22C38/00C21D9/46C22C38/06C22C38/60
CPCC21D9/46C22C38/06C22C38/60C22C38/02C22C38/04C22C38/12C22C38/14C22C38/16C22C38/32C22C38/38C22C38/34C21D2211/002C21D2211/008C21D2211/004C21D8/0226C21D8/0263C21D8/0273C21D8/0473C21D8/0426C21D8/0463C21D9/48C21D1/19C21D1/22C25D3/22C21D6/02C21D6/005C21D6/008C25D5/36C25D3/565C25D5/50C22C38/001C22C38/08C22C38/44C22C38/46C22C38/50C21D8/1222C21D8/1272B21C47/02C23C2/06H01F1/147C21D8/0236
Inventor 平岛拓弥小野义彦
Owner JFE STEEL CORP