METHOD FOR MANUFACTURING A HOT PRESS-MOLDED MEMBER

WIPO Patent Application WO/2011/081043

A1

Provided is a method that can stably mass-produce hot press-molded members with good post-coating corrosion resistance by hot press-molding galvanized steel sheets. A galvanized steel sheet is heat-treated as follows: heating to between 600°C and 750°C, with the rate of temperature increase up to 600°C being at most 50°C/sec, and then cooling to 550°C or less. This yields a steel blank that has an outermost layer of zinc oxide and, underneath that, a zinc-iron alloy phase with an iron content of at least 25% by mass. Said steel blank is heated to at least the Ac3 point, and press molding is begun immediately thereafter, at a temperature greater than or equal to the Ac3 point. Quenching is performed after that, resulting in a hot press-molded member that has a surface layer of zinc oxide and an iron-zinc solid solution phase but does not have either an intermetallic phase or a pure zinc layer.

IMAI Kazuhito (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
今井　和仁 (〒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)

JP2010/072850

July 07, 2011

December 20, 2010

Click for automatic bibliography generation  

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)
TOYODA IRON WORKS CO., LTD. (50 Hosoya-cho 4-chome, Toyota-shi Aichi, 07, 〒4718507, JP)
豊田鉄工株式会社 (〒07 愛知県豊田市細谷町４丁目５０番地 Aichi, 〒4718507, JP)

C23C28/00; B21D22/20; C23C2/28; C25D5/50

HIROSE Shoichi (Tozan Building, 4-2 Nihonbashi Honcho 4-chome, Chuo-k, Tokyo 23, 〒1030023, JP)

View/Download PDF      PDF Help

Previous Patent: POWER-SAVING OPERATION SUPPORT DEVICE, POWER-SAVING OPERATION SUPPORT METHOD, RECORDING MEDIUM, AND ...

Next Patent: COPPER FOIL AND COPPER-CLAD LAMINATE PLATE USING SAME