1947.02

Yamato Kogyosho was founded in 1 Kameido, Koto-ku, Tokyo.

1949.01

K.K. Yamato Kogyosho was established with ￥500,000 capital as a steel material wholesaler.

1960.04

Small hot rolling mill was established in 7 Ayase, Adachi-ku, Tokyo to produce special steel flat barsand profile bar.

1970.04

Trade name was changed from K.K. Yamato Kogyosho to Yamato Special Steel K.K.
Urayasu Center was established in the Urayasu Steel Industrial Zone, Urayasu City, Chiba.

1971.08

Fitting group was established as a production/sales function dedicated toforged high-pressure fitting.

1975.06

Capital was increased to ￥30,000,000.

1983.02

Shin Urayasu Center was established in the Urayasu Second Steel Industrial Zone to replace the company's warehouses distributed over three places.

1985.07

Head office building was completed in 1 Kameido, Koto-ku, Tokyo.

1989.09

Multistory storage system exclusively for forged high-pressure fitting was built in Urayasu Center.

1991.09

Yamagata Branch was established in Higashine City, as the base of sales activities in the Tohoku district.

1994.05

Multistory storage system exclusively for steel materials was built in Urayasu Center.

2000.05

ISO9002 certification was obtained. (Head office, Urayasu center)

2000.07

Kofu Branch was established in the Kosai Industrial Zone in Minami Arupusu City, Yamanashi.

2003.04

Adachi plant's production was discontinued. Sales operation was continued.

2003.08

ISO9001 certification was obtained. (Head office, Urayasu center)

2006.11

New Yamagata Braich was established in Tendo, Yamagata. Previous Yamagata branch was closed.

2007.09

The automated high stocking system in Urayasu was removed. New stocking system was installed.

2007.12

IMADEST Co., Ltd was founded.
All groups of Yamato was approved in ISO14001

2008.03

All groups of Yamato was approved in ISO9001

2011.08

Korean Office is open in Busan

2012.01

Increase the capital to 50,000,000yen

2012.06

Kofu Branch moves to a new site