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The Steel Authority of India Limited's (SAIL) Bhilai Steel Plant (BSP) has made tremendous progress in developing strategic defence materials. Their production of next-generation steel, specifically made for the S5 class of nuclear-powered ballistic missile submarines (SSBNs), is a pioneering achievement.
The S5-class submarine is a projected class of nuclear-powered ballistic missile submarines (SSBNs) for the Indian Navy that is currently under development.
This new steel is currently undergoing a thorough multi-year testing phase to ensure it meets the exacting performance standards required for underwater applications. Once the testing process is completed and the steel has been approved for use, it will be used to construct S5 class SSBNs.
These submarines are said to be truly underwater giants, with a submerged displacement of over 12,000 tonnes and a length of around 150 metres. India's underwater deterrent capabilities are anticipated to be greatly improved by the S5 class submarines, solidifying India's status as a major maritime power.
The Indian government evaluated the S5 class submarine project in 2006, and manufacturing is anticipated to begin in 2027. With their second-strike capabilities, these submarines, a cornerstone of India's strategic nuclear deterrent, are anticipated to be extremely important to the country's defence plans. The S5 class will be part of India's nuclear deterrence triad, which includes land-based missiles, strategic bombers, and SSBNs.
This new steel variant is likely to provide increased strength, corrosion resistance, and endurance compared to conventional materials, which are crucial for submarines' harsh circumstances in deep-sea habitats. The testing for submarine steel is said to be ten times more stringent than that for steel used in the INS Vikrant, emphasising the importance of submarine construction and the high standards required.
This specialist steel is anticipated to improve the structural integrity and safety of S5 class submarines, strengthening India's strategic defence capabilities and advancing its defence technology independence. The Defence Metallurgical Research Laboratory (DMRL) and the Indian Navy will conduct thorough testing and inspections on the steel produced by BSP before it is used to construct the submarine.
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