A Six-Pound Furnace in New Hartford
In 1952, a team at Special Metals Corporation in New Hartford, New York, loaded six pounds of Waspaloy into an unusual piece of equipment: a vacuum induction melting furnace (VIM). The nickel-based superalloy was destined for Pratt & Whitney’s J48 turbojet engine. The problem it was meant to solve had nothing to do with the alloy’s composition. The recipe was known. The problem was contamination.
Standard air melting introduced oxygen and nitrogen at concentrations that made the superalloy unpredictable at high temperatures. Turbine blades forged from air-melted material would hold their shape in a test rig and crack in an engine. The culprit: dissolved gases, tramp elements at parts-per-million concentrations, alumina inclusions from crucible reactions. The composition was right. The process was not.
Vacuum induction melting fixed this by removing the atmosphere entirely. Within a year, Allegheny Ludlum performed the first production vacuum arc remelt (VAR). By 1960, Allvac Metals was producing double vacuum-melted (VIM/VAR) superalloys exclusively. By 1967, US VIM furnace capacity had grown from 750 tons to 90,000 tons in a decade. The metallurgist and legend Rudolph Thielemann observed that “the introduction of the melting furnace has furthered metallurgical progress in alloy development more than any other single factor.”
The point was not the recipe. It was the crucible.
The Headline Everyone Is Celebrating
In January 2026, India’s Centre for Military Airworthiness and Certification (CEMILAC) granted provisional clearance to MIDHANI — Mishra Dhatu Nigam Limited, the Hyderabad-based defence PSU — for indigenous superalloy grades. These include equivalents to BZL1, BZL14H, and ZS 6Y, for the AL-31FP engine that powers India’s Su-30MKI fleet. Eight superalloy grades, two titanium alloy grades, four special steel grades. More than 200 parts supplied to aero engine applications.
This is a real achievement. Indian-produced superalloys, melted in Indian furnaces, can now go inside a frontline fighter engine. An application where failure is measured in lives, not warranties. MIDHANI’s FY26 revenue hit a record Rs 1,208.63 crore, up 12.52% year-on-year, with an order book of Rs 2,290 crore. CMD Dr S.V.S. Narayana Murty announced a Rs 500 crore infrastructure expansion targeting rare-earth self-reliance and next-generation superalloys. A “Metal Bank” — a strategic reserve of critical raw materials — is being established to buffer against supply disruptions.
But MIDHANI can make the superalloy. The question is where the ingredients come from.
A quick distinction, because the rest of this piece depends on it. Superalloys are the finished high-performance alloys that go into engines — the turbine blades, the combustion liners, the discs. Master alloys are the precisely formulated intermediate feedstocks — aluminium-vanadium, nickel-niobium, aluminium-molybdenum-titanium — that get added in controlled amounts during vacuum melting to produce those superalloys. Think of superalloys as the dish. Master alloys are the spice blends that go into the pot.
The Number Beneath the Number
The Kaveri engine programme requires approximately 16,500 kilograms of advanced materials. MIDHANI supplies over 13,300 kilograms — aerospace-grade titanium and nickel-based superalloys. But roughly 4,124 kilograms, about a quarter, must be sourced from foreign suppliers. The entire L-605 cobalt-based superalloy requirement — all 1,650 kilograms — is imported.
Now zoom further upstream. MIDHANI itself imports approximately Rs 500 crore in raw materials annually. Nickel, cobalt, molybdenum, tungsten, chromium, vanadium, rhenium, titanium feedstock. Among these are the master alloys — the intermediate formulations that serve as controlled additions during vacuum melting. They are the ingredients that go into the crucible before the superalloy comes out.
The Srijan Defence Indigenisation Portal lists six of these master alloy feedstocks — items 381 through 386 — as targets for import substitution, with an indicative indigenisation date of December 2027. All six are MIDHANI entries: aluminium-vanadium (AlV), nickel-niobium (NiNb), nickel oxide sinter, pure iron, electrolytic manganese at 99.9% purity, and aluminium-molybdenum-titanium (AlMoTi).
None of these is currently produced in India at aerospace-grade specification.
That gap — between making the superalloy and making the master alloy feedstocks that go into it — is the whole story.
The Process Moat
The barrier to domestic master alloy production is not chemistry. The downstream science — how these master alloy additions behave once they enter a superalloy melt — is thoroughly mapped. A systematic review of 66 papers published between 2018 and 2026 confirms that the role of titanium, niobium, and aluminium in precipitation strengthening of nickel-based superalloys is well-characterised. Indian metallurgists know exactly what composition each master alloy must hit. What they lack is the production process to hit it cleanly, at aerospace purity, lot after lot.
Each of the six Srijan-listed master alloy feedstocks presents a specific engineering contradiction:
Aluminium-vanadium (AlV): Vanadium content must be 55-65% for efficient alloying. But higher vanadium makes the master alloy brittle and impossible to crush to controlled particle sizes. Simultaneously, aerospace-grade AlV requires oxygen below ~500 ppm. The standard aluminothermic reduction route inherently introduces alumina inclusions. Improving one parameter worsens the other.
Nickel-niobium (NiNb): Niobium melts at 2,477°C. Reaching that temperature risks crucible contamination. Achieving homogeneity requires extended holding times — which increases the contamination window. The master alloy must have zero niobium-rich segregation zones. Niobium’s density and melting point conspire against that.
Electrolytic manganese (99.9%): Higher current density increases throughput but decreases purity. Selenium and tellurium co-deposit. India’s MOIL — the country’s largest manganese ore producer — provides the raw material. But the electrolytic refining gap between steel-grade (~99.7%) and superalloy-grade (99.9%+) is a process problem, not a mining problem.
Aluminium-molybdenum-titanium (AlMoTi): Three reactive metals with melting points spanning 660°C to 2,623°C. Vastly different oxygen affinities. The process window where all three are liquid but crucible attack is manageable is narrow or nonexistent. Alternative routes — mechanical alloying, hot isostatic pressing — are being investigated in the literature but are not yet production-qualified.
This is structurally identical to the problem Special Metals solved in 1952. The superalloy recipe was known. The process to produce it cleanly was not. Today, the master alloy compositions are known. The process to produce them at aerospace purity — and certify that purity lot by lot — is the moat.
Indigenisation and Sovereignty Are Not the Same Thing
In Metal Beneath the Fire, we drew a distinction between indigenisation — making the product in India — and sovereign supply chain — owning the raw materials, the process infrastructure, and the intellectual property end to end. Master alloys are where that distinction cuts deepest.
MIDHANI’s CEMILAC certification is indigenisation of the superalloy. India is making the finished product. But if the aluminium-vanadium master alloy that goes into the melt comes from KBM Affilips in the Netherlands, if the nickel-niobium depends on CBMM’s niobium from Brazil, if the electrolytic manganese is refined in China — then the superalloy is Indian but the supply chain is not.
The concentration is extreme. CBMM controls approximately 80% of global niobium supply. China accounts for roughly 95% of global EMM production. KBM Affilips and Kymera International — which acquired Reading Alloys from AMETEK in 2020 — between them supply much of the aerospace world’s aluminium-vanadium and titanium master alloys.
These are not diversified global markets. They are oligopolies. In some cases, near-monopolies. They function precisely because the volumes are small enough that no one else has built certified alternatives.
The global master alloy market is estimated at roughly $657.6 million by 2028. The aerospace-grade subset is a fraction of that. India’s Rs 1,200-crore superalloy enterprise depends on upstream master alloy inputs that barely register in global trade statistics. Small enough to be invisible. Critical enough to be a chokepoint.
The Constraint Is Certification, Not Chemistry
India’s private sector can melt metals. Multiple companies operate ferro-alloy plants for the steel industry — ferro-silicon, ferro-manganese, silico-manganese. But ferro-alloys for steelmaking and master alloys for aerospace superalloy production are fundamentally different products. Different purity thresholds, different documentation requirements, different customers.
The core gap is this: no Indian entity currently produces certified aerospace-grade master alloys. MIDHANI produces certified superalloys — but it buys the master alloy feedstocks that go into them. Private-sector producers can make alloys that analyse correctly on a spectrometer. They cannot yet provide the certification dossier — material traceability, grain structure validation, impurity mapping, lot-by-lot documentation — that an aerospace OEM requires before accepting a master alloy into its supply chain.
This is the “TRL plateau” that defence analysts have identified. Indian producers can reach “chemically correct.” They cannot yet cross the threshold to “certifiably fit for an engine.”
Investing in furnaces without the validated process recipe — specific cooling rates, vacuum cycles, hold times, cleaning protocols for each alloy grade — produces expensive paperweights. Furnaces that make master alloys that fail certification.
Who Might Close the Gap
MIDHANI again is the obvious pathway. It has VIM/VAR infrastructure, CEMILAC relationships, and the Rs 500 crore expansion budget. Its Metal Bank addresses the raw-material buffer problem. But MIDHANI’s Rs 2,290 crore order book suggests it is already running near capacity. Asking one PSU to solve the upstream master alloy problem while simultaneously scaling finished superalloy output is asking it to do two things that compete for the same capital and engineering bandwidth.
Raghu Vamsi Aerospace deserves close attention. In July 2026, the company announced a Rs 600 crore investment in a 50-acre integrated facility at Hardware Park near Hyderabad’s international airport. Vacuum melting, forging, heat treatment, vacuum casting, powder metallurgy. Planned capacity: 5,000 tonnes annually. Commercial production target: January 2028. The project is led by Dr S.K. Jha — former chairman of MIDHANI itself. The company already supplies complex aero-engine components to GE Aerospace, Pratt & Whitney, Honeywell, Safran, and Collins Aerospace. Whether Raghu Vamsi aims to produce master alloy feedstocks or only finished superalloy components remains the question that will determine its significance for this story.
International partnerships remain the fastest route for specific items. Technology licensing from KBM Affilips or Kymera International could transfer process know-how for AlV and NiNb master alloy production. But the incentive structure is not straightforward. Existing suppliers have little reason to create competitors for small-volume, high-margin products.
The institutional question is unresolved. India could pursue a centralised model — a shared certification hub at MIDHANI where multiple producers validate their master alloys using common equipment. Or a distributed model with independent facilities. Each has precedents. Russia’s VSMPO-AVISMA achieved vertical integration from titanium ore to finished aerospace parts under one entity. The US distributed capability across TIMET, ATI, and the strategic materials stockpile. China used state-directed investment for rare earths and manganese. India has not yet chosen its model.
The Verdict
MIDHANI’s CEMILAC certification is a genuine milestone. Dr Narayana Murty and the MIDHANI metallurgy team who moved those superalloy grades from laboratory formulation to engine-qualified production deserve specific credit for a multi-year, technically demanding achievement. The Srijan portal, and the Positive Indigenisation Lists — six lists notified as of August 2026, the most recent comprising 405 items — have done the right thing by naming the upstream master alloy feedstocks explicitly rather than letting them remain invisible.
But indigenisation and sovereignty are not the same thing. India is certifiably good at cooking the superalloy. The question is whether it owns the pantry of master alloy ingredients.
The thing to watch: whether any Indian entity — Raghu Vamsi, a MIDHANI subsidiary, a DRDO-backed consortium — delivers a CEMILAC-accepted or AMS-specification master alloy within three years. Not a superalloy. A master alloy. The feedstock, not the finished product. If that happens, the game changes. If it doesn’t, the Srijan list’s December 2027 dates will quietly slip, and India’s superalloy story will remain what it is today — a recipe without a crucible.
Want us to cover specific areas, let us know in comments, will add them to our pipeline.
