Scrap-EAF vs BF-BOF: The Reline-Retire-Retool Decision Every Indian Steel CFO Must Make
India’s blast furnaces are ageing. When a furnace reaches the end of its campaign, the decision to reline, retire, or retool toward EAF is no longer just a technical one — it is a carbon compliance, trade competitiveness, and capital allocation decision simultaneously. At current CBAM costs and coking coal prices, the arithmetic has fundamentally shifted.
Key Takeaways
- India operates approximately 50 to 60 blast furnaces across integrated steel plants, with an average campaign age exceeding 20 years and a significant proportion approaching or past their scheduled reline windows. A blast furnace reline — the replacement of the refractory lining at the end of a campaign — costs Rs 800 to 1,200 crore for a large furnace and extends operational life by 12 to 15 years. Every reline decision is therefore a 12-to-15-year lock-in on BF-BOF production economics and BF-BOF carbon intensity.
- The financial case for relining versus retooling to EAF has shifted materially since 2022 for three compounding reasons. First, coking coal prices rose from approximately $150/t to $250–300/t during 2021–2022 and have remained elevated, with freight costs adding a further 30–40 percent premium during the West Asia War. Second, CBAM since January 2026 puts a direct financial penalty on BF-BOF’s high Scope 1 embedded emission intensity of approximately 2.1–2.3 tCO₂/t relative to the EU benchmark. Third, CCTS GEI targets — once notified for steel — will create annual compliance costs for BF-BOF plants that EAF plants will avoid or reverse.
- A scrap-EAF conversion for a 1 MTPA capacity increment requires a capital investment of approximately Rs 2,500 to 4,000 crore — significantly more than a blast furnace reline. However, the operating cost differential, CBAM cost avoidance, and CCTS compliance revenue transform the economics over a 15-year asset life. At current prices, the EAF route generates approximately Rs 25,000 to 40,000 crore in cumulative operating cost and carbon cost savings over 15 years relative to a relining BF-BOF — against the Rs 1,700 to 2,800 crore incremental capital cost of choosing EAF over reline.
- India’s domestic scrap availability is the binding constraint on EAF expansion. India generates approximately 28 to 35 million tonnes of scrap per year — sufficient to support approximately 35 to 45 million tonnes of EAF production annually, against an existing EAF fleet capacity of approximately 50 to 55 million tonnes. The scrap balance is already stretched, and large-scale BF-to-EAF conversion would require either scrap imports or DRI substitution to fill the gap. DRI from natural gas or green hydrogen enables EAF production without scrap dependency — shifting the constraint from domestic scrap availability to hydrogen feedstock availability.
- The decision is not binary for all plants. Large integrated plants with 4 to 6 million tonnes of annual BF-BOF capacity and captive iron ore mines face a different economics than standalone 1 to 2 million tonne converters. Captive ore mines make BF-BOF more defensible because the iron ore cost is below market, reducing the raw material cost premium of the BF-BOF route. The reline case is strongest for these captive-ore integrated players. The EAF/DRI case is strongest for standalone converters that buy iron ore at market prices and face the full coking coal cost.
- The Green Steel Taxonomy (Gazette 763E, BIS IS 18032:2023) and the government’s green procurement preference create a revenue premium for taxonomy-certified producers that is not available to plants that reline and remain in BF-BOF without a credible transition plan. A BF-BOF reline without taxonomy alignment is a capital investment in a non-premium-priced asset class — one that will face progressively tighter CBAM costs, higher CCTS compliance costs, and lower government procurement access through the 2030s.
India produced 149 to 150 million tonnes of crude steel in FY 2025-26, making it the world’s second-largest steel producer. Approximately 77 percent of that production came from the integrated blast furnace-basic oxygen furnace route — a share that reflects both the historical investment in integrated steelmaking capacity and the structural limitations of India’s domestic scrap availability. The BF-BOF route is not inherently inferior to EAF on product quality for flat steel applications. What has changed, with uncomfortable speed since 2022, is the operating cost environment and the carbon compliance cost burden of the BF-BOF route — both of which have moved decisively against reline decisions and in favour of retooling.
The reline-retire-retool decision is not abstract. It is occurring in real time at major Indian integrated steel plants. SAIL’s Bhilai Steel Plant, JSW’s Vijayanagar complex, Tata Steel’s Jamshedpur facility, and RINL’s Vizag plant all have blast furnaces that have completed or are approaching their current campaign lives. Each of those decisions — worth Rs 800 to 1,200 crore individually and collectively determining the carbon intensity of hundreds of millions of tonnes of annual steel production over the next decade and a half — is being made in a cost environment that was fundamentally different when the last reline decisions were taken in the 2008 to 2015 period.
The operating cost comparison: what has changed since 2022
The BF-BOF operating cost structure has three major variable cost components: iron ore, coking coal, and electricity for auxiliary operations. EAF operating costs are dominated by scrap or DRI input cost, electricity for steelmaking, and electrode cost. The relative economics of the two routes depend primarily on the coking coal versus scrap/electricity cost relationship — which has been in flux since 2021.
Scrap-EAF Operating Cost/t: Scrap (1.1t/t × Rs 28,000/t, domestic HMS-1): Rs 30,800 Electricity (400 kWh × Rs 6/unit): Rs 2,400 Electrodes, refractories, alloys: Rs 1,800 Labour, maintenance, overheads: Rs 1,800 Total Scrap-EAF: ~Rs 36,800/t
EAF PREMIUM over BF-BOF (operating): ~Rs 18,325/t at current scrap prices BUT: EAF avoids CBAM cost of ~€60–80/t (~Rs 5,400–7,200/t) on EU exports AND: EAF avoids CCTS compliance cost (est. Rs 1,500–4,000/t once GEI targets set) AND: EAF scrap input qualifies for Green Steel Taxonomy Tier 2+ → green procurement premium Rs 2,000–4,000/t
The raw operating cost comparison above appears to favour BF-BOF by approximately Rs 18,325 per tonne — a significant advantage. But this comparison is misleading in the current regulatory environment for three reasons that the formula’s lower section begins to capture. First, the CBAM cost for EU-exported BF-BOF steel is approximately €60 to 80 per tonne and rising as EU ETS prices increase and free allocations phase out — a cost that EAF-scrap steel largely avoids because its Scope 1 emission intensity is approximately 0.3 to 0.8 tCO₂/t versus BF-BOF’s 2.1 to 2.3 tCO₂/t. Second, the CCTS GEI compliance cost — once steel GEI targets are notified — will add Rs 1,500 to 4,000 per tonne to BF-BOF operating cost for plants missing their targets while generating positive CCC revenue for EAF plants that over-achieve. Third, the green procurement premium available to taxonomy-certified EAF producers closes a further Rs 2,000 to 4,000 per tonne of the apparent operating cost gap.
BF-BOF Reline — The Cost Profile Through 2040
EAF Retooling — The Cost Profile Through 2040
The 15-year NPV: where the economics actually land
The economically correct frame for the reline-versus-retool decision is a 15-year net present value comparison that captures all cash flows — capital, operating cost, CBAM liability, CCTS compliance cost or revenue, and green premium revenue — over the full asset life that either decision implies. This is the framework that a steel company CFO should be using, and the one that the engineering-focused reline cost comparison almost always omits.
15-Year NPV Comparison — BF-BOF Reline vs Scrap-EAF Retool · 1 MTPA Capacity · April 2026 Assumptions
| Cash Flow Item | BF-BOF Reline (15 yr) | Scrap-EAF Retool (15 yr) | EAF Advantage |
|---|---|---|---|
| Upfront capital (nominal) | Rs 1,000 cr | Rs 3,250 cr | BF-BOF saves Rs 2,250 cr upfront |
| Coking coal cost premium vs scrap-EAF (cumulative) | — | EAF saves ~Rs 5,000–8,000 cr over 15 yr at 1 MMT/yr | EAF saves Rs 5,000–8,000 cr |
| CBAM liability (EU exports, 15 yr, rising EU ETS) | Rs 8,000–15,000 cr est. | Rs 500–1,500 cr est. | EAF saves Rs 7,500–13,500 cr |
| CCTS compliance cost (net of CCC revenue) | Rs 2,000–5,000 cr (buyer) | Rs 0 to –Rs 2,000 cr (seller) | EAF saves/earns Rs 2,000–7,000 cr |
| Green steel premium revenue (procurement + market) | Rs 0–1,500 cr (Tier 1 only) | Rs 6,000–12,000 cr (Tier 2/3) | EAF captures Rs 4,500–10,500 cr |
| Scrap cost premium vs BF-BOF iron ore + coke | — | EAF pays Rs 3,000–6,000 cr more for scrap | BF-BOF saves Rs 3,000–6,000 cr |
| Net 15-year cumulative advantage (EAF over BF-BOF) | Rs 16,000–33,000 cr per 1 MTPA | ||
The NPV comparison is clear. Despite the higher upfront capital of EAF retooling relative to BF-BOF relining, the cumulative 15-year advantage of EAF is estimated at Rs 16,000 to 33,000 crore per million tonne of capacity — at current CBAM costs, CCTS targets, and market prices. This range is wide because the dominant uncertainty is the CBAM trajectory (which depends on EU ETS prices) and the CCTS compliance cost (which depends on GEI target stringency not yet known for steel). Even under the most conservative assumptions — EU ETS at €60/t flat, CCTS compliance cost at the low end — the EAF advantage over 15 years substantially exceeds the incremental capital cost of choosing retooling over relining.
The scrap availability constraint that changes the EAF calculus for large integrated players. For a SAIL or JSW plant with 4 to 6 MTPA of BF-BOF capacity, converting entirely to scrap-EAF would require 4.4 to 6.6 million tonnes of scrap per year — approximately 13 to 20 percent of India’s entire annual scrap supply. This is physically impossible at current domestic scrap volumes. The realistic pathway for large integrated players is a hybrid strategy: DRI-EAF for new capacity increments using natural gas (transitioning to green hydrogen as it becomes available), combined with scrap-EAF for smaller specialty steel capacity where scrap supply is feasible, and continued operation of the existing BF-BOF fleet with renewable electricity to improve Scope 2 GEI and Green Steel Taxonomy tier until the full transition is possible. The reline decision, for these players, is not reline vs EAF — it is reline vs DRI-EAF hybrid, which changes both the capital cost and the feedstock supply picture.
Frequently Asked Questions
What is a blast furnace reline and why does it matter for decarbonisation?
A blast furnace reline is the replacement of the refractory brick lining inside the furnace at the end of its operational campaign — typically every 12 to 20 years. Relining costs Rs 800 to 1,200 crore for a large furnace and commits the plant to another 12 to 15 years of BF-BOF production. The relining decision is therefore a 12-to-15-year lock-in on BF-BOF carbon intensity — meaning a reline decision taken in 2026 commits the plant to BF-BOF production costs, CBAM liability, and CCTS compliance costs through approximately 2038 to 2041, well into the period when CBAM costs will be at their peak and CCTS GEI targets will be significantly tighter than today.
Is India’s domestic scrap supply sufficient to support large-scale EAF expansion?
India generates approximately 28 to 35 million tonnes of steel scrap per year, rising at approximately 5 to 7 percent annually as the installed stock of older steel matures. This is sufficient to support approximately 35 to 45 million tonnes of EAF production per year — but India’s current EAF capacity is already approximately 50 to 55 million tonnes, meaning the scrap balance is already tight. Large-scale conversion of BF-BOF capacity to EAF would require either scrap imports (which are commercially viable but add supply chain complexity) or substitution of scrap with DRI produced from natural gas or eventually green hydrogen. The DRI-EAF route is the realistic long-term pathway for India’s large integrated players.
How does CBAM affect the reline-versus-retool decision?
CBAM for steel covers Scope 1 direct emissions only. BF-BOF’s average Scope 1 emission intensity of approximately 2.1 to 2.3 tCO₂/t sits approximately 54 percent above the EU benchmark intensity, creating a CBAM certificate obligation of approximately €60 to 80 per tonne of steel exported to the EU at current EU ETS prices of €84.20/tCO₂e. Scrap-EAF’s Scope 1 intensity of 0.3 to 0.8 tCO₂/t is below or close to the EU benchmark, creating minimal CBAM liability. Over a 15-year asset life with EU ETS prices rising and free allocations phasing out, this CBAM differential is one of the largest components of the EAF financial advantage in the NPV comparison.
Which Indian steel companies are facing reline decisions in the next 2 to 5 years?
Based on publicly available commissioning dates and typical campaign lengths, several SAIL blast furnaces at Bhilai, Durgapur, and Rourkela are in the 20-to-25-year age range that typically triggers reline consideration. JSW’s Vijayanagar complex has furnaces commissioned in the early 2000s approaching reline windows. RINL Vizag has furnaces from similar vintages. JSPL’s Raigarh plant has a more recent BF installation. The pattern suggests that 2026 to 2030 is a concentrated window of reline decisions at Indian integrated steel companies — making the current moment analytically critical for understanding the decarbonisation trajectory of Indian steel through the 2030s.
Sources
- World Steel Association — Steel statistical yearbook 2025 — production routes, emission intensities
- Ministry of Steel — Green Steel Taxonomy — Gazette Notification 763E, BIS IS 18032:2023
- European Commission — CBAM Regulation — steel benchmark intensities and certificate pricing
- NITI Aayog — India Steel Decarbonisation Roadmap — technology pathways and cost curves
- SAIL, JSW Steel, Tata Steel — Annual Reports FY2024-25 — blast furnace asset details and capex programmes
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