Overview
ISO 630-1:2021 - Structural steels - Part 1: General technical delivery conditions for hot-rolled products defines the general technical delivery conditions for hot‑rolled steel flat and long products (plates, sections, wide flats and bars) intended mainly for general-purpose structural steels used in welded or bolted structures. It sets out the purchaser/producer information, testing and inspection framework, and basic requirements that harmonize how structural steel is specified, supplied and verified. Note: sheet/strip and tubular products are excluded (covered by other ISO technical committees).
Key topics and requirements
- Scope & classification
- Applies to plates, sections, wide flats and bars; grades designated in the ISO 630 series; thickness is treated as nominal thickness unless stated otherwise.
- Information to be supplied by purchaser
- Mandatory items: quantity, product type, nominal dimensions and tolerances, ISO 630 part number, steel grade/name, options and inspection document required.
- Chemical composition
- Heat and product analysis requirements and carbon equivalent considerations for weldability (options may be agreed).
- Mechanical properties
- Tensile properties (ISO 6892-1 referenced), impact energy/Charpy V‑notch requirements at specified temperatures (quality A–L), and through‑thickness characteristics.
- Surface condition & dimensional tolerances
- Surface finish delivery requirements and tolerances on dimensions, shape and mass are defined or referenced (e.g., ISO 7788, ISO 9034).
- Inspection, sampling and testing
- Types of inspection documents (ISO 10474), sampling frequency, preparation of test pieces (ISO 377/14284), and test methods (Charpy - ISO 148‑1, tensile - ISO 6892‑1, ultrasonic - ISO 17577).
- Marking and documentation
- Requirements for marking and issuance of inspection/test certificates on delivery.
Applications and practical value
- Ensures consistent specification and traceability of hot‑rolled structural steels for:
- Structural steel fabricators and welding contractors
- Steel producers and rolling mills
- Construction engineers and specifiers preparing procurement documents
- Quality assurance and testing laboratories performing tensile, impact, ultrasonic and chemical analyses
- Procurement teams requiring standardized inspection certificates
- Using ISO 630-1 improves interoperability between suppliers and buyers, streamlines conformity checks, and reduces disputes over material properties, surface condition, and testing.
Related standards
Keywords: ISO 630-1, structural steels, hot-rolled products, technical delivery conditions, steel flat and long products, welded structures, nominal thickness, inspection, mechanical properties.