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Indigenous Stellite Nozzle
July 18 , 2025
16 hrs 0 min
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- ISRO has successfully tested an indigenous Stellite (KC20WN) alloy nozzle divergent for the PSLV’s fourth stage.
- It was made by replacing imported Columbium (C103) and achieving a 90% cost reduction.
- The divergent nozzle is the flared section of a rocket engine that accelerates exhaust gases to generate thrust.
- Divergent Nozzle controls thrust direction and speed, crucial for stabilising and guiding the rocket during ascent.
- It experiences extreme thermal and mechanical stress during rocket operation, often exceeding 1100°C.
- Columbium (C103), a rare, heat-resistant metal previously imported, was used in PSLV’s fourth-stage nozzle.
- Stellite (KC20WN), a cobalt-based alloy enriched with Chromium, Nickel, Tungsten, and Iron.
- It was developed and tested indigenously at ISRO’s Propulsion Complex, Mahendragiri in Tirunelveli District.
- It eliminates dependence on costly imports and achieves up to 90% cost savings compared to Columbium-based nozzles.
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