| 1935 |
Our company was founded in 1935 (Showa 10), and since then, has been developing business activities centered on hot-dip galvanized steel sheets. |
| 1935-01-28 |
Established in Osaka City on January 30 for the purpose of manufacturing steel plates and steel materials. |
| 1940 |
Acquired Osaka Tin Plate Manufacturing Co., Ltd., establishing an integrated production system for galvanized steel sheets. |
| 1948 |
Constructed electric and reverberatory furnaces, beginning the production of cast steel products and rolls. |
| 1949 |
Opened the Uta Island Factory in Osaka City to start manufacturing enameled products. |
| 1951 |
Acquired Sumitomo Industries Co., Ltd. Izumiotsu Factory and began producing billets of ordinary and special steels using electric furnaces, as well as cast forged steel products. |
| 1952 |
Relocated headquarters to Hakuroucho (now Chuo Ward), Higashi-ku, Osaka City. |
| 1953 |
Began construction of a cold rolling steel sheet manufacturing plant in Kure City, Hiroshima Prefecture. |
| 1954 |
Completed the Kure Plant and started manufacturing cold rolled steel sheets and polished steel strips. |
| 1955 |
Started manufacturing architectural enameled decorative panels at Uta Island Factory. |
| 1956 |
Installed a 25-ton reverberatory furnace at Osaka Factory and began large roll manufacturing. |
| 1959 |
Installed a 20-ton electric furnace at Izumiotsu Factory. |
| 1960 |
Installed a lever rolling mill at Kure Factory. |
| 1961 |
Updated the continuous acid cleaning equipment at Kure Factory. |
| 1963 |
Installed a continuous zinc coating equipment at Kure Factory. |
| 1964 |
Installed a coating equipment for hot-dip galvanized steel sheets at Osaka Factory. |
| 1965 |
Started manufacturing and selling steel sheet building materials. |
| 1966 |
Formed a partnership with Signode Corporation in the United States and acquired exclusive manufacturing and sales rights for polished steel strips used in their packing systems. |
| 1967 |
Constructed a new Uta Island Factory adjacent to Osaka Factory to consolidate production of architectural enameled decorative panels and bathtubs. Started manufacturing paper machine swimming rolls through technical cooperation with West German Kuster. |
| 1968 |
Established Keiyo Steel Pier Corporation in Ichikawa City, Chiba Prefecture. |
| 1970 |
Started manufacturing and sales of exterior products. Began construction of a cold rolling steel sheet and enameled product manufacturing plant in Ichikawa City, Chiba Prefecture. Increased the continuous zinc coating equipment at Kure Factory and added a new continuous coating line. |
| 1971 |
Ichikawa Horello Factory completed. A roll centrifugal casting equipment was newly installed at Osaka Factory. |
| 1972 |
Head office relocated to Minami Honmachi (now Chuo Ward), Osaka City. Ichikawa Cold Rolled Steel Sheet Factory completed. Started manufacturing stainless steel covered grooved rolls for paper making through technical partnership with Erostrom Corporation of Finland. Established Yodoko Kōhatsu Co., Ltd. in Osaka City. |
| 1973 |
Started manufacturing gratings at Izumiotsu Factory. |
| 1974 |
New continuous casting equipment installed at Izumiotsu Factory. An additional 20-ton electric furnace installed at Izumiotsu Factory. Nishiwaki Country Club opened in Nishiwaki City, Hyogo Prefecture. |
| 1975 |
Started manufacturing and selling household goods. A super-large roll centrifugal casting equipment was newly installed at Osaka Factory. Established Hotel Plaza Miyazaki in Miyazaki City. |
| 1976 |
Ceased manufacturing of enameled products. |
| 1978 |
New continuous zinc coating equipment installed at Ichikawa Factory. Grating manufacturing equipment added at Izumiotsu Factory. |
| 1979 |
Research and development coating equipment newly installed at Osaka Factory. |
| 1980 |
Furnace outside refining equipment newly installed at Izumiotsu Factory. Takada Steel Industry Co., Ltd. established in Osaka City. |
| 1981 |
New continuous coating equipment for molten zinc coated steel sheets installed at Ichikawa Factory. |
| 1982 |
Started manufacturing and selling Galfan steel sheets, introduced technology from the International Lead and Zinc Research Organization (ILZRO). |
| 1983 |
Electromagnetic stirring device added to the continuous casting equipment at Izumiotsu Factory. |
| 1984 |
New continuous coating equipment installed at Osaka Factory. Established Arashin Co., Ltd. (now Yodoko Kōsan Co., Ltd.) in Osaka City. |
| 1985 |
Yodoko Second Building completed in Bakuromachi (now Chuo Ward), Osaka City. |
| 1986 |
Started manufacturing and selling Galvalume steel sheets, introduced technology from Bethlehem Steel of the United States. New continuous multi-purpose zinc coating equipment installed at Ichikawa Factory. |
| 1987 |
Tokyo Branch relocated to Tokyo Yodoko Building in Shintomi, Chuo Ward, Tokyo. Capital participation in Sanyu Steel Corporation of Taiwan. Osaka Yodohan Co., Ltd. established in Sakai City, Osaka Prefecture. |
| 2025-01 |
In January 2025, we will celebrate our 90th anniversary, and established a new corporate philosophy "Let's Bloom. People, Town, Future." |
| 2025-10 |
In October of the same year, we changed our company name from Yodogawa Steel Works, Ltd. to Yodoko Co., Ltd. |
