Denso Corporation

Tomohiro Andoh

Koji Morita

Takahiro Miyazaki

Kazuyoshi Kimura

Tadashi Nishiwaki

Tomomitsu Fukuoka

Yuuki Tanaka

Makoto Haritani

Toshimasa Ito

Keisuke Inoue

A workpiece for a fuel injection component is made of a steel having compositions, by mass %, of C: 0.08 to 0.16%, Si: 0.10 to 0.30%, Mn: 1.00 to 2.00%, S: 0.005 to 0.030%, Cu: 0.01 to 0.30%, Ni: 0.40 to 1.50%, Cr: 0.50 to 1.50%, Mo: 0.30 to 0.70%, V: 0.10 to 0.40%, s-Al: 0.001 to 0.100%, and Fe and unavoidable impurities as remaining components. After heating the workpiece to a temperature of 950&#xb0; C. or more and 1350&#xb0; C. or less, the workpiece is subjected to a hot forging, and thereafter cooled at an average cooling rate of 0.1&#xb0; C./sec. or more in a temperature range from 800&#xb0; C. to 500&#xb0; C., and at the average cooling rate of 0.02&#xb0; C./sec. or more and 10&#xb0; C./sec. or less in the subsequent temperature range from 500&#xb0; C. to 300&#xb0; C. to set an area ratio of a bainite structure after hot forging to 85% or more.

Method for manufacturing fuel injection component

Growing community of inventors

Nagoya, Japan

Tomohiro Andoh