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Title:
CURVED METALLIC MATERIAL AND PROCESS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2010/084883
Kind Code:
A1
Abstract:
A curved metallic material is produced by subjecting a metallic material plated with a zinc-based material to bending involving a heat treatment.  The curved metallic material has high strength and has excellent corrosion resistance after coating, and is hence suitable for use as an automotive member, etc. The outer surface of a tubular metallic material having, on the surfaces thereof, a Zn-Fe alloy deposit film formed in an amount of 30-90 g/m2 per surface and having an iron content of 8-20% and a surface roughness (Ra) of 0.8 µm or less is supported, so as to be freely movable in the axial direction of the metallic material, in two positions apart from each other in the axial direction.  While being fed in the axial direction, the metallic material is heated, in the region between the two positions, to a temperature of Ac3 point or higher at a heating rate of 3.0×102 ºC/sec or higher.  The metallic material is held so that the period during which the temperature of the surface is 8.0×102ºC or higher is 2 seconds or shorter.  Thereafter, the metallic material is rapidly cooled and, simultaneously therewith, that one of the two positions which is located downstream in the feed direction of the metallic material is two-dimensionally or three-dimensionally changed to thereby impart a bending moment to the heated part of the metallic material.  As a result, a curved metallic material having, on the surfaces, a zinc-based coating film deposited in an amount of 30-90 g/m2 per surface, having an iron content of 8-35% and a surface roughness (Ra) of 2.0 µm or less, and including an η phase can be produced.

Inventors:
NAKAMURA Toyomitsu (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
中村 登代充 (〒41 大阪府大阪市中央区北浜4丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
TOMIZAWA Atsushi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
富澤 淳 (〒41 大阪府大阪市中央区北浜4丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
SHIMADA Naoaki (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
嶋田 直明 (〒41 大阪府大阪市中央区北浜4丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
KOJIMA Nobusato (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
Application Number:
JP2010/050637
Publication Date:
July 29, 2010
Filing Date:
January 20, 2010
Export Citation:
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Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜4丁目5番33号 Osaka, 〒5410041, JP)
NAKAMURA Toyomitsu (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
中村 登代充 (〒41 大阪府大阪市中央区北浜4丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
TOMIZAWA Atsushi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
富澤 淳 (〒41 大阪府大阪市中央区北浜4丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
SHIMADA Naoaki (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
嶋田 直明 (〒41 大阪府大阪市中央区北浜4丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
International Classes:
B21D7/16; C21D9/08; C23C2/06
Attorney, Agent or Firm:
HIROSE Shoichi (Tozan Building, 4-2 Nihonbashi Honcho 4-chome, Chuo-k, Tokyo 23, 〒1030023, JP)
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