Overview
ISO 15179:2022 specifies requirements for hot-rolled twin-roll cast steel sheet of structural quality and high strength steel. The standard covers materials produced by the twin‑roll casting process and finished on a wide strip mill (not a plate mill). It defines chemical composition, mechanical properties, dimensions, testing, tolerances and inspection rules for sheets typically used in bolted, riveted or welded structures and delivered in the as‑rolled condition.
Keywords: ISO 15179, hot-rolled twin-roll cast steel sheet, structural quality, high strength steel, twin-roll cast, microalloyed steel, mechanical properties.
Key topics and technical requirements
- Scope and product form
- Applies to twin‑roll cast sheet produced to near‑final thickness with minimal hot‑rolling.
- Typical thickness range: 0.7 mm to 2.0 mm; widths up to 2 000 mm (coils and cut lengths).
- Chemical composition
- Heat (steelmaking) analysis and product analysis requirements with limits for C, Mn, P, S and limits/ reporting for Cu, Ni, Cr, Mo, Nb, V, Ti, N.
- High‑strength grades are microalloyed (V, Ti and/or Nb) with options for nitrogen control.
- Mechanical properties
- Yield and tensile strength and minimum elongation specified in tabular form for structural grades (HR275–HR550) and high‑strength grades (HSS 310–HSS 550).
- Yield may be measured as 0.5 % proof or 0.2 % offset where applicable.
- Testing and sampling
- Tensile testing performed on specimens taken per clauses in the standard and by reference to ISO 6892‑1 (room temperature tensile testing).
- Product analysis tolerances defined; purchaser may request heat analysis reports.
- Manufacture, surface and supply
- Requirements for descaling, skin passing, oiling, weldability considerations, and surface condition.
- Coil size, marking, inspection and acceptance criteria are included.
Applications and users
- Typical applications: load‑bearing structural components, automotive or industrial panels, and any application requiring defined mechanical properties and weldability in thin, wide strip form.
- Primary users:
- Steel producers and mill quality managers specifying production parameters.
- Purchasers and procurement teams requiring certified material grades.
- Fabricators, structural engineers and inspectors verifying compliance for bolted, riveted or welded assemblies.
- Metallurgists and QA laboratories carrying out chemical and tensile tests.
Related standards
- ISO 6892‑1 - Metallic materials: tensile testing at room temperature (referenced for tensile test method).
- ISO 16160 - Hot‑rolled steel sheet products: dimensional and shape tolerances (referenced for tolerances).
ISO 15179 provides practical, standardized requirements to ensure consistent performance of twin‑roll cast hot‑rolled steel sheet for structural and high‑strength applications.