Decarbonizing the global steel industry in a resource-constrained future-a systems perspective.

Area of Science:

• Industrial Ecology
• Materials Science
• Climate Change Mitigation

Background:

• The global steel industry faces significant decarbonization challenges.
• Current strategies rely on expanding limited resources like carbon storage, clean electricity, and scrap, assuming continuous steel demand growth.
• Existing analyses often overlook resource supply constraints.

Purpose of the Study:

• To propose an alternative decarbonization pathway for the steel industry based on realistic resource supply limitations.
• To analyze steel production capacity within a Paris-compatible carbon budget.
• To identify critical challenges beyond technological investment.

Main Methods:

• System analysis incorporating historical trends and actual construction plans for resource supply.
• Modeling of global steel production against a Paris-compatible carbon budget.
• Assessment of demand reduction, scrap upcycling, and equitable distribution strategies.

Main Results:

• Global steel production cannot increase and meet projected 2050 demand within the carbon budget, indicating a ~30% shortfall.
• Decarbonization necessitates phasing out blast furnaces and significant growth in scrap recycling and hydrogen-based steelmaking.
• Key challenges include reducing excess demand, upcycling scrap for high-grade steel, and ensuring fair global production allocation.

Conclusions:

• A Paris-compatible steel industry requires production levels below projected demand, contrasting with current expansion-focused agendas.
• Focus must shift towards resource efficiency, circular economy principles (scrap upcycling), and equitable resource distribution.
• This physically-grounded perspective offers a more balanced approach for policymaking and industrial strategy in sustainable metals.