SAIL powers INS Taragiri with indigenous special steel

1. At a Glance

• Steel Authority of India Limited (SAIL), a Maharatna CPSE under the Ministry of Steel, supplied the entire ~4,000 tonnes of special-grade steel plates used to build INS Taragiri, the fourth Project 17A Nilgiri-class stealth frigate [S1][S3].
• Demonstrates convergence of Aatmanirbhar Bharat, defence indigenisation, and Make in India in heavy industry + warship-building [S1][S3].
• Examinable for GS-III (Defence, Indigenisation, Industry, PSU) and Prelims facts on Project 17A, SAIL plants and DMR steel grades.

2. Why in the News

• INS Taragiri commissioned into the Indian Navy at Visakhapatnam on 3 April 2026, in presence of Raksha Mantri Rajnath Singh [S3].
• SAIL's role highlighted via a Ministry of Steel PIB release dated 5 April 2026, recording supply of ~4,000 t of special steel from Bokaro, Bhilai and Rourkela plants [S1].

3. Background & Evolution

• Project 17A — follow-on to Project 17 (Shivalik-class); seven stealth frigates sanctioned; built by Mazagon Dock Shipbuilders Ltd (MDL), Mumbai and Garden Reach Shipbuilders & Engineers (GRSE), Kolkata [S3].
• Earlier ships of class commissioned/delivered: Nilgiri, Udaygiri, Himgiri, Surat (P15B) etc.; Taragiri launched in Sept 2022, delivered to Navy in Feb 2026, commissioned 3 Apr 2026 [S2][S3].
• DMR-249A / DMR-249B indigenous warship-grade steels were jointly developed by SAIL, Indian Navy and DMRL (DRDO) as import substitutes for the imported ABA / AB2 (American Bureau) grades [S4].
• Prior SAIL supplies: INS Vikrant (IAC-1), INS Nilgiri, INS Udaygiri, INS Surat, INS Anjadip, ASW-SWC corvettes [S4].

4. Core Static Facts

• Ship: INS Taragiri — 4th of Nilgiri-class (Project 17A) stealth frigate [S1][S3].
• Builder: Mazagon Dock Shipbuilders Ltd (MDL), Mumbai [S1].
• Designer: Warship Design Bureau, Indian Navy [S3].
• Displacement: ~6,670 tonnes; >75% indigenous content [S3].
• Commissioned: 3 April 2026 at Visakhapatnam, Andhra Pradesh [S3].
• Steel supplied: ~4,000 tonnes of special-grade plates by SAIL [S1].
• SAIL plants involved: Bhilai (Chhattisgarh), Bokaro (Jharkhand), Rourkela (Odisha) — all integrated steel plants [S1][S4].
• Steel grades: DMR-249A (hull/interiors) and DMR-249B (flight-deck) — indigenous substitutes for ABA/AB2 [S4].
• Parent ministry of SAIL: Ministry of Steel; status: Maharatna CPSE [S1].
• Predecessor: Erstwhile INS Taragiri, a Leander-class frigate (16 May 1980 – 27 Jun 2013) [S3].
• Armament: Supersonic Surface-to-Surface missiles, Medium-Range SAM, indigenous anti-submarine suite [S3].

5. Multi-Dimensional Analysis

Economic / Industrial - Captive demand for special steel from Navy strengthens domestic metallurgy value chain; reduces forex outflow on imported AB-grade plates [S4]. - Reinforces SAIL's Vision 2030 modernisation and capacity utilisation of its three eastern integrated plants [S1].

Strategic / Defence - Project 17A enhances blue-water frigate strength; >75% indigenous content advances Atmanirbhar Bharat in Defence [S3]. - Navy has mandated DMR-249 for all future warship construction and repairs, locking in indigenous supply chain [S4].

Scientific / Technological - DMR steels co-developed by SAIL + Indian Navy + DMRL (DRDO) — a triple-helix PSU-services-R&D model [S4]. - Achieves stealth-grade hull properties (toughness, weldability, low-magnetic signature) earlier sourced abroad [S4].

Administrative / Governance - Inter-ministerial coordination: MoD (Navy), Ministry of Steel (SAIL), DRDO (DMRL) — model of cross-ministry indigenisation [S1][S4].

6. Recent Developments (last 12-18 months)

• Jan 2025: Nilgiri (P17A) and Surat (P15B) plus Vagsheer commissioned at Mumbai [S2].
• Apr 2025: Udaygiri & Himgiri (P17A) commissioned at Visakhapatnam [S2].
• Feb 2026: Taragiri delivered to Indian Navy [S2].
• 3 Apr 2026: INS Taragiri commissioned at Visakhapatnam [S3].
• 5 Apr 2026: Ministry of Steel PIB release on SAIL's 4,000 t contribution [S1].
• Subsequent: Delivery of 'Mahendragiri' (7th P17A) progressing [S2].

7. Prelims Hooks

• INS Taragiri commissioned on 3 April 2026 at Visakhapatnam [S3].
• It is the 4th ship of Project 17A (Nilgiri-class) stealth frigates [S1].
• Built by Mazagon Dock Shipbuilders Ltd (MDL), Mumbai [S1].
• Designed by the Warship Design Bureau of the Indian Navy [S3].
• Displacement ≈ 6,670 t; indigenous content >75% [S3].
• SAIL supplied ~4,000 tonnes of special-grade steel for Taragiri [S1].
• Steel produced at SAIL plants — Bhilai, Bokaro, Rourkela [S1].
• Indigenous warship steel grades: DMR-249A (hull) and DMR-249B (flight-deck) [S4].
• DMR steels were co-developed by SAIL, DMRL (DRDO) and Indian Navy as substitutes for ABA/AB2 American Bureau grades [S4].
• SAIL is a Maharatna CPSE under the Ministry of Steel [S1].
• The previous INS Taragiri was a Leander-class frigate (in service 1980-2013) [S3].
• DMR-249 steel was first prominently used in INS Vikrant (IAC-1) [S4].
• Project 17A frigates are built by MDL (Mumbai) and GRSE (Kolkata) [S2].

8. Mains Relevance

• GS-III — Indigenisation of technology and developing new technology; Defence sector; Role of PSUs.
• GS-III — Effects of liberalisation on the economy; industrial policy; infrastructure (heavy industry).
• Possible question stems: 1. "Indigenisation of warship-grade steel illustrates the synergy between defence PSUs, R&D establishments and the armed forces." Discuss with reference to SAIL-DMRL-Navy collaboration. 2. Examine the role of Maharatna CPSEs like SAIL in advancing the Aatmanirbhar Bharat vision in strategic sectors. 3. Critically evaluate the progress of Project 17A and its contribution to India's blue-water capability.

9. Related Topics to Study Next

• Project 17A & Project 15B — overall warship modernisation programmes.
• DRDO / DMRL — speciality material development for defence.
• Maharatna, Navratna, Miniratna PSUs — classification & autonomy criteria.
• SAIL Vision 2030 — modernisation of integrated steel plants.
• National Steel Policy 2017 — domestic steel demand and self-reliance targets.
• Defence Acquisition Procedure (DAP) 2020 — indigenisation categories (Buy-Indian IDDM).
• iDEX & SRIJAN portal — defence indigenisation platforms.
• INS Vikrant (IAC-1) — flagship indigenous warship using DMR steel.

10. Common Errors / Trap Areas

• Builder confusion: P17A Taragiri was built by MDL Mumbai, not GRSE Kolkata (GRSE builds the other 3 of the 7 P17A frigates).
• Class mix-up: Taragiri is Project 17A (Nilgiri-class), not Project 17 (Shivalik-class) or Project 15B (Visakhapatnam-class destroyers).
• Steel grade naming: DMR-249A / 249B are SAIL-DMRL indigenous grades; aspirants confuse them with foreign ABA / AB2 designations.
• Ministry: SAIL is under Ministry of Steel, not Ministry of Heavy Industries or MoD.
• Plants: Special steel came from Bhilai, Bokaro, Rourkela — not Durgapur, IISCO-Burnpur or Salem.
• Historical: The previous Taragiri was Leander-class, not Nilgiri-class (the 1972-vintage Nilgiri-class itself was also Leander-derived — easy to confuse).

11. Sources

• [S1] SAIL powers INS Taragiri with indigenous special steel — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2249111 — (tier 1)
• [S2] Delivery of 'Taragiri' — 4th Nilgiri-class (P17A) stealth frigate — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2196229 — (tier 1)
• [S3] Indian Navy's latest stealth frigate INS Taragiri commissioned in Visakhapatnam — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2248799 — (tier 1)
• [S4] Speciality Steels for Naval Applications — DRDO — https://www.drdo.gov.in/speciality-steels-naval-applications — (tier 1)