Dual Carbon Goal: New Decarbonization Paths for Stainless Steel Short-Process Smelting

1. Introduction: Why Short-Process Smelting Matters for Dual Carbon

Stainless steel is essential for industries—from kitchen appliances to wind turbines.

But its production is a major carbon emitter, accounting for 7% of global carbon emissions.

Traditional long-process smelting (blast furnace + converter) releases 2.5-3 tonnes of CO₂ per tonne of stainless steel.

Under the dual carbon goal (peak carbon emissions and carbon neutrality), the stainless steel industry needs cleaner, low-carbon solutions.

Short-process smelting (mainly EAF + LF) is the answer. It cuts carbon emissions by 40% per tonne of steel and fits the dual carbon target perfectly.

This guide breaks down the new decarbonization paths in plain English—no complex jargon. Perfect for steel mill operators, industry professionals, and anyone focused on low-carbon manufacturing.

2. Key Basics: Short-Process vs. Long-Process Smelting

To understand the decarbonization value, first see the clear difference between the two smelting routes.

2.1 Core Differences in Raw Materials & Emissions

Long-process: Relies on iron ore and coking coal (a major carbon source), with high emissions.

Short-process: Uses 90-95% recycled stainless steel scrap, skipping coking coal and cutting emissions drastically.

Data speaks: Short-process emits only 1.2-1.5 tonnes of CO₂ per tonne of steel—40% lower than long-process.

2.2 Why Short-Process Fits Dual Carbon Goals

It skips high-emission ironmaking steps (sintering, coking) that account for 70% of long-process emissions.

Recycling 1 tonne of scrap instead of 1 tonne of iron ore saves 1.8 tonnes of CO₂.

It’s also flexible, cost-effective, and easy to upgrade for further decarbonization.

3. New Decarbonization Paths for Short-Process Smelting (Practical & Proven)

These paths are not lab experiments—they’re being used by real steel mills worldwide to cut emissions.

3.1 Optimize EAF+LF Technology (Core Path)

EAF (Electric Arc Furnace) + LF (Ladle Furnace) is the core of short-process smelting.

Optimize EAF: Preheat scrap to 600-800℃ using waste heat, cutting melting time by 15% and electricity use.

Refine LF: Use precise alloy addition systems to reduce energy waste and carbon emissions.

Result: A Chinese mill cut tonne-steel electricity use by 335 kWh and emissions by 42% with optimized EAF+LF.

3.2 Increase High-Quality Scrap Recycling

Scrap quality directly affects emissions—dirty scrap (with paint, oil) releases extra CO₂ when melted.

Steps to improve scrap quality: Sort scrap with magnetic separators to remove non-steel contaminants.

Shred scrap into small pieces for faster melting, reducing energy use by 100 kWh per tonne.

Outlook: By 2030. China’s annual recycled stainless steel scrap will exceed 18 million tonnes, supporting short-process growth.

3.3 Use Green Electricity (Game-Changer for Decarbonization)

Short-process uses 80% electricity—switching to green power (solar, wind) cuts emissions even more.

Real case: A European mill uses 100% green electricity, reducing tonne-steel emissions to 0.87 tonnes.

Practical tip: Mills in wind/solar-rich areas can partner with power grids to increase green electricity consumption to over 40%.

3.4 Integrate CCUS & Waste Heat Recovery

CCUS (Carbon Capture, Utilization and Storage) captures EAF emissions, preventing them from entering the atmosphere.

Waste heat recovery: Recover 800-1000℃ waste heat from continuous casting to generate steam, meeting 60% of mill energy needs.

4. Key Challenges & Practical Solutions

Short-process decarbonization isn’t without hurdles—but these solutions work for real mills.

4.1 Challenge 1: High Green Electricity Costs

Solution: Partner with green power providers for long-term contracts to lower costs.

Some regions offer subsidies for green electricity use, reducing mill expenses.

4.2 Challenge 2: Insufficient High-Quality Scrap

Solution: Build a closed-loop scrap recycling system, using blockchain to track scrap quality.

Invest in scrap preprocessing equipment to improve cleanliness to 99.2%.

4.3 Challenge 3: High Upgrade Costs

Solution: Apply for green finance loans or carbon quota pledges to fund EAF and CCUS upgrades.

Start with small upgrades (e.g., scrap preheating) for quick emission cuts and cost savings.

5. Real Mill Cases (Proven Decarbonization Results)

These cases show short-process decarbonization works—no empty promises.

5.1 Hongwang Steel (China)

Adopted EAF+LF short-process, cutting emissions by 40% per tonne of stainless steel.

Increased scrap use to 95% and optimized energy use, lowering production costs by 15%.

5.2 Outokumpu (Europe)

Uses 100% green electricity and high-quality scrap, cutting tonne-steel emissions to 1.6 tonnes.

Integrated CCUS technology to capture 30% of remaining emissions.

5.3 Shigang (China)

Switched from long-process to short-process, cutting tonne-steel energy use by 62% and emissions by 75%.

6. Conclusion

Under the dual carbon goal, short-process smelting is the most practical decarbonization path for the stainless steel industry.

Optimizing EAF+LF technology, increasing high-quality scrap recycling, using green electricity, and integrating CCUS all work together to cut emissions.

It’s not just about meeting carbon targets—it also lowers costs, improves efficiency, and helps mills avoid carbon tariffs like the EU’s CBAM.

As scrap recycling systems improve and green electricity becomes more affordable, short-process smelting will become the mainstream for stainless steel production.

For steel mills, embracing these new paths isn’t an option—it’s a necessity to stay competitive in the low-carbon era.