| 1919 |
フェロクロムの試験製造を開始 |
| 1919 |
Tosa Denka Kogyo Co., Ltd. established : Started the trial manufacture of ferro-chrome |
| 1931 |
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| 1932 |
電気炉新設 |
| 1935 |
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| 1936 |
生石灰焼成炉２基新設 |
| 1940 |
トヨパウダー（フェロアロイ加工品）製造開始 |
| 1942 |
|
| 1942 |
合金鉄用7,500KVA電気炉（１０号炉）新設 |
| 1942 |
Constructed a 1,800 KVA electric furnace (#1) for carbide |
| 1944 |
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| 1945 |
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| 1953 |
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| 1956 |
|
| 1956 |
Signed a partnership with Toa Gosei Kagaku Kogyo Co., Ltd. (present: Toa Gosei Co., Ltd.) : Changed company name to TOYO DENKA KOGYO Co., Ltd. : Greatly expanded business |
| 1957 |
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| 1957 |
Constructed a 5,000 KVA electric furnace (#5) for ferro-alloy : and a 13,000 KVA electric furnace (#6) for carbide |
| 1960 |
Powered up #6 furnace to 15,000 KVA |
| 1961 |
Constructed a 18,000 KVA electric furnace (#7) for carbide : and two quick lime combustion furnaces |
| 1963 |
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| 1965 |
Constructed a 12,000 KVA electric furnace (#8) for ferro-alloy : Started the manufacture of TOYO POWDER (ferro-alloy processed product) |
| 1967 |
Constructed calcium phosphate for feed facilities : Constructed a 7,500 KVA electric furnace (#10) for ferro-alloy |
| 1969 |
Constructed a serpentine mining plant |
| 1970 |
Constructed a 40,000 KVA electric furnace (#11) for ferro-silicon |
| 1978 |
Started the manufacture of a graphite spheroidizing agent for cast metal (special alloy) |
| 1981 |
Constructed calcium carbonate facilities |
| 1982 |
Started manufacture of Lincar Pellet |
| 1988 |
Started operations at Chiba Logistics Center |
| 1993 |
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| 1993 |
Opened Beijing Office |
| 1995 |
|
| 1995 |
Established a Chinese joint venture called ZHEN JIANG DONFENG SPECIAL ALLOY Co., Ltd. |
| 1999 |
|
| 1999 |
Started the manufacture of cored wire |
| 2001 |
|
| 2001 |
Established TOYO HYMOLD INTERNATIONAL Pte. Ltd. in Singapore |
| 2004 |
|
| 2004 |
Renovated head office building |
| 2005 |
|
| 2005 |
Opened Shanghai Office : Acquired ISO14001 : Established a Chinese joint venture called XICHANG TOYO LIAMGZAI SPECIAL ALLOY Co., Ltd. |
| 2007 |
「東洋平成ポリマー株式会社」誕生 |
| 2007 |
Established TOYO HEISEI POLYMER Co., Ltd. with the merger of TOYO CHEMICAL Co., Ltd, and HEISEI POLYMER Co., Ltd. |
| 2009 |
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| 2009 |
Established TOYO BUSINESS SOLUTIONS Co., Ltd. : Established TOYO DENKA TECHNO RESEARCH Co., Ltd. |
| 2010 |
|
| 2010 |
Started operation of a silicon metal pulverization plant |
| 2011 |
|
| 2011 |
Started operation of ash tech beads manufacturing facilities |
| 2014 |
|
| 2014 |
Started operation of special ferro-alloy manufacturing facilities at HYMOLD (THAILAND) Ltd. |
| 2016 |
特殊アロイ用２t高周波炉を一基増設 |
| 2016 |
Set up tsunami evacuation facilities in our Head Office plant : Constructed a 2 T high-frequency furnace for special alloys |
| 2018 |
|
| 2018 |
Completed the office annex (and tsunami evacuation building) |
| 2019 |
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| 2019 |
Marked the 100th anniversary since our foundation |
| 2021 |
|
| 2021 |
Started operation of new cored wire plant |
