ISMT began life in 1980 as The Indian Seamless Metal Tubes Limited. At the time, the company operated one Assel Mill with an installed capacity of 15,000 metric tons per annum. Subsequently, in 1990, production was increased to 50,000 metric tons per annum with the addition of a second Assel Mill.1995In 1995, The Indian Seamless Metal Tubes Limited launched a new company, Indian Seamless Steels and Alloys Ltd. (ISSAL), to produce alloy Steel, the raw material used in the manufacture of seamless tubes, giving the company better control over product quality as well as deliveries.2000In April 2000 The Indian Seamless Metal Tubes Limited acquired Kalyani Seamless Tubes Ltd. (KSTL), a competing manufacturer of seamless tubes. The combined entity, which retained the name The Indian Seamless Metal Tubes Ltd, not only had a larger capacity (150,000 metric tons per annum) but also a much wider size range (from 6mm to 273 mm).