|Established by Asaji Inoue, Representative Director, in Mikunino-mura, Shikama-gun, Hyogo Pref. (currently Himeji City), as a subcontracting factory in the Himeji district, of Kawanishi Aircraft Co., Ltd.
|Switched the operation over to the manufacture, and repair of trackwork materials for supply to the Japanese National Railways and private railways.
|The production of steel castings was started at the Nibuno plant.
|A 15-ton Heroult electric arc furnace was built inhouse at the Nibuno plant.
|Construction of a large-size rolling mill at the Nibuno plant was completed.
Thus, the company became the only maker of trackwork materials in Japan to operate on a "through" basis-from production of steel ingots to rolling of steel materials and fabrication of final products.
|A 40-ton electric arc furnace went into operation at the Aboshi plant.
|Established Yamato Shoji Co., Ltd.
|Shares listed in the First Section of the Tokyo and Osaka Stock Exchange.
|The Steel Frame and Bridge Construction Dept. (heavy industries dept.) was established at the main plant.
|The Nibuno and Ichikawa plants were moved to the site of the main plant to concentrate operations.
|The Heavy-duty Machining Dept. was newly established and went into operation.
|The No.1 continuous casting machine went into operation.
|A 50-ton electric arc furnace went into operation.
|A universal mill went into operation.
|No.2 continuous casting machine went into operation.
|Established Nucor-Yamato Steel Co., Ltd joint venture in America.
|Established Arkansas Steel Associates LLC joint venture in America.
|Four strand beam blank/bloom combination type continuous casting machines started operations (upgrade of the No.1 and No.2 casting machines).
|Established Siam Yamato Steel Co., Ltd joint venture in Thailand.
|Started use of 130-ton direct current electric arc furnace (upgrade of the 40-ton and 50-ton electric arc furnaces).
|The trackwork materials department was separated and Yamato Trackwork System Co., Ltd was established.
|Established Yamato Korea Steel Corporation (currently YK Steel Corporation) in Korea.
|The steel and heavy industry departments were spun off and Yamato Steel Co., Ltd. was established. Yamato Kogyo Co., Ltd was converted to a holding company.
|Established United Steel Company (SULB) (currently SULB Company BSC(c)) in Bahrain.
|The second plant began operations at Siam Yamato Steel Co., Ltd.
|Established United SULB Company (Saudi Sulb) LLC in Saudi Arabia.
|Established POSCO YAMATO VINA STEEL JOINT STOCK COMPANY in Vietnam.
|Shifted from the First Section to the Prime Market in accordance with the reorganization of the market segmentation of the Tokyo Stock Exchange.