Evidence-bound company brief · as of September 18, 2026

Nippon Steel TSE: 5401

Integrated steelmaking and circular-economy transition

NS
Public materials brief.

Nippon Steel reports 34.30 million tons of crude steel and 20.42 million tons of by-products for FY2024, with a 99% total by-product recycling rate. Steelmaking slag accounted for 4.41 million tons and was recycled at a 98% rate. The report does not establish an available scrap stream, melt-shop recipe, slag buyer, or customer qualification at a specific plant.

99%FY2024 by-product recycling rate

OpenSite, grade and buyer evidence

ScreeningNo commercial claim

As ofSeptember 18, 2026

Material inputs to resolve

Ferrous scrap and iron-bearing secondary inputs
Steelmaking slag and process residuals

Outputs and residuals to resolve

Steel products meeting grade requirements
By-product routes requiring site-specific proof

First decision: Furnace route, chemistry limits, volume, yield and buyer-grade requirements.

What is disclosed

Nippon Steel says its sustainability report has been integrated into the 2025 integrated report and identifies circular economy as a priority area.

What remains unproven

No public source here identifies a plant-level feedstock mix, residual chemistry, contract volume or downstream acceptance.

Decision boundary

Nippon Steel identifies creation of a circular economy as a priority issue. The usable Material Transition lane is scrap and steelmaking residuals at a named works, not a generic green-steel narrative. The public record supports one bounded next move: Furnace route, chemistry limits, volume, yield and buyer-grade requirements. It does not establish a buyer, commercial approval or supply agreement.

Material flow map

Material or stream	Qualification gate	Process or destination	Evidence still needed
Ferrous scrap and iron-bearing secondary inputs	Composition and specification	Steel products meeting grade requirements	Site, volume and buyer evidence
Steelmaking slag and process residuals	Condition and logistics	By-product routes requiring site-specific proof	Yield and destination evidence

This is a public screening map. It separates company-disclosed flows from open qualification work. It does not convert a destination into a buyer or an announced ambition into operating capacity.

Evidence register

Integrated Report 2025Nippon Steelhttps://www-zam.nipponsteel.com/en/ir/library/pdf/nsc_en_ir_2025_06.pdf
Sustainability hubNippon Steelhttps://www.nipponsteel.com/en/sustainability/
Sustainability report archiveNippon Steelhttps://www.nipponsteel.com/en/csr/report/index.html
Integrated Report 2025 libraryNippon Steel, official report libraryhttps://www.nipponsteel.com/en/ir/library/annual_report.html
Integrated Report 2025 complete fileNippon Steel, official integrated reporthttps://www.nipponsteel.com/en/ir/library/pdf/nsc_en_ir_2025_all.pdf

Source hierarchy: filings and company disclosures first. The brief states what those sources support and leaves the unresolved plant, grade, permit, buyer and mass-balance questions explicit.

Artifact metadata

Public briefArtifact ID: mt-nippon-steel-20260917As of: 2026-09-18Public-facing metadata only

Machine-readable source manifest

{
  "artifact_id": "mt-nippon-steel-20260917",
  "company": "Nippon Steel",
  "as_of_date": "2026-09-18",
  "sources": [
    {
      "title": "Integrated Report 2025",
      "publisher": "Nippon Steel",
      "url": "https://www-zam.nipponsteel.com/en/ir/library/pdf/nsc_en_ir_2025_06.pdf"
    },
    {
      "title": "Sustainability hub",
      "publisher": "Nippon Steel",
      "url": "https://www.nipponsteel.com/en/sustainability/"
    },
    {
      "title": "Sustainability report archive",
      "publisher": "Nippon Steel",
      "url": "https://www.nipponsteel.com/en/csr/report/index.html"
    }
  ]
}