| Milestones |
| 1977 |
THE INDIAN SEAMLESS METAL TUBES LTD. Incorporated |
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| 1980 |
THE INDIAN SEAMLESS METAL TUBES LTD. Starts commercial production |
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| 1988 |
TANEJA AEROSPACE & AVIATION LTD. Incorporated |
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| 1989 |
INDIAN SEAMLESS STEELS & ALLOYS LTD. Incorporated |
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| 1994 |
TANEJA AEROSPACE & AVIATION LTD. First certification of airworthy flight/ commercial production |
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| 1994 |
INDIAN SEAMLESS STEELS & ALLOYS LTD. Starts commercial production |
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| 1999 |
KALYANI SEAMLESS TUBES LTD merges with THE INDIAN SEAMLESS METAL TUBES LTD. |
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| 2005 |
ISMT Limited formed through the merger of The Indian Seamless Metal Tubes Ltd and Indian Seamless Steels and Alloys Ltd. |
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| 2007 |
ISMT Ltd. acquired a 100% stake in Structo Hydraulic AB, Sweden. |
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