Toyota Jidosha Kabushiki Kaisha

Proterial, Ltd.

Umetoku Co., Ltd

Daido Chemical Co., Ltd.

Naoki Hayashi

Kenichi Inoue

Satoshi Murakami

Shuho Koseki

Tatsuya Shouji

Yoshikazu Suzuki

Katsuhiro Obata

Nobuhiro Ikeda

Kousuke Uda

Takashi Ogisu

Toshifumi Miyamoto

Toru Otomo

A method for manufacturing a forged article, capable of improving the durability of a die for forging is provided. The method, includes forging a steel material, by using a die, by spraying or applying a water-soluble polymer lubricant containing 0.01 to 0.98 mass % of a water-soluble sulfate onto a working surface of the die, the die being made of a raw material having a constituent composition of by mass %, of 0.4 to 0.7% of C, 1.0% or less of Si, 1.0% or less of Mn, 4.0 to 6.0% of Cr, 2.0 to 4.0% of (Mo+½W), 0.5 to 2.5% of (V+Nb), 0 to 1.0% of Ni, 0 to 5.0% of Co, 0.02% or less of N, and a remnant composed of Fe and impurities, and having hardness of 55 to 60 HRC, and the die including a nitrided layer or a nitrosulfidized layer on the working surface thereof.

Method for manufacturing forged article

Growing community of inventors

Aichi, Japan

Naoki Hayashi