November
1944

Yamato Kogyo Co., Ltd. is established by Asaji Inoue, Representative Director, in Mikunino-mura, Shikama-gun, Hyogo Prefecture (now part of the city of Himeji) as a subcontract factory of Kawanishi Aircraft Co.,Ltd

August
1945

With the end of WWII, operations switched to the production and repair of railroad track components for Japan National Railways and private railway companies.

September
1958

Production of cast steel began at Nibuno Factory.

December
1961

Operation of a 40-ton electric furnace began at the newly built Aboshi Factory.

January
1962

Operation of a new plate mill began at Aboshi Factory.

September
1962

Steel Frame and Bridge Construction Department (present Heavy-duty Machinning Department) was established.

May
1968

Discontinued the production of steel plates.

November
1969

Heavy-duty Machining Department (present Heavy-duty Machining Department) was established.

May
1973

No.1 continuous casting equipment went into operation(2strands).

August
1973

A 50-ton electric furnace went into operation(replacing the former 40-ton furnaces).

November
1975

Operation of universal mill began.

March
1978

No.2 continuous casting equipment went into operation(1strand).

March
1979

A 40-ton electric furnace went into operation.

February
1987

No.1 Ladle Furnace was operated.

October
1991

Started operation of a 4-strand beam blank/bloom combination type continuous casting machine (replacing No. 1 and No. 2 continuous casting machines).

April
1996

Started operation of a 130-ton direct current electric furnace (replacing the former 40- and 50-ton furnaces).

August
1999

No.1 store building for beam was completed.

September
2000

Upgraded dust collector went into operation.

December
2000

Acquisition of certification of ISO9001.

March
2001

Reheating furnace with walking beam went into operation.

May
2001

A commercial operation of H700 was started.

October
2003

Steel Department and Heavy-duty Machining Department of Yamato Kogyo Co., Ltd. are spun off to establish Yamato Steel Co., Ltd.

January
2006

Fuel of preheating device for ladle and tundish was changed into natural gas.

August
2006

Fatory administration office was completed.

August
2006

Upgraded Finishing Mill went into operation.

September
2006

A commercial operation of H800 was started.

December
2006

Acquisition of certification of ISO14001.

April
2007

Upgraded Booster fan in primary fume plant.

January
2008

Upgrade Universal reversing Mill went into operation.

February
2008

No.2 store building for beam was completed.

March
2008

Upgraded Edger Mill went into operation.

September
2008

The building for model rolling test machine was completed.

December
2008

Multi-function burner went into operation on DC furnace.

February
2011

A commercial operation of H900 was started.

June
2013

A slag crasher of furnace slag went into operation.

April
2021

Profile gauge went into operation.