Overview
ISO 12633-1:2011 defines the technical delivery conditions for hot-finished structural hollow sections of circular, square or rectangular form made from non-alloy steels and fine grain steels. It covers hollow sections formed hot (with or without subsequent heat treatment) or formed cold and heat treated to achieve metallurgical equivalence with hot-formed products. The standard provides the framework for steel grades, chemical composition, mechanical properties, delivery conditions and required inspection and testing procedures. Grades and property tables are given in Annex A (non-alloy steels) and Annex B (fine grain steels).
Key topics and requirements
- Scope and classification
- Applies to hot-finished circular, square and rectangular hollow sections.
- Non-alloy grades specify qualities JR, J0 and J2 (different impact and deoxidation requirements).
- Fine grain steels specify qualities N and NL (normalized conditions and low-temperature impact criteria).
- Steel designation
- Standardized name format includes designation (ISO 12633-1), “S” for structural steel, minimum yield strength, quality letters (JR/J0/J2 or N/L) and “H” for hollow sections.
- Delivery conditions
- Hot-formed with/without heat treatment, or cold-formed with heat treatment to equivalent metallurgical state.
- Fine grain steels are generally delivered normalized.
- Chemical and mechanical requirements
- Composition and mechanical property limits provided in annexes; purchaser options include product analysis and maximum carbon equivalent (CEV) limits.
- Manufacturing and weld requirements
- Permit seamless or welded manufacturing; specific rules on weld testing, non-destructive testing (eddy current, ultrasonic, radiography, flux leakage) and internal weld bead trimming.
- Inspection, testing and documentation
- Defines inspection types, sample locations and frequency, test methods (tensile, Charpy impact, chemical analysis), marking and inspection certificates.
- Options for purchasers
- Examples: require product analysis, set CEV limits, request impact verification, specify galvanizing suitability, prohibit weld repairs.
Practical applications
ISO 12633-1 is essential where consistent material performance, traceability and fitness-for-purpose are required:
- Structural steel tube manufacturers and mills - to certify product delivery conditions and inspection regimes.
- Structural engineers and designers - to specify material grades and mechanical properties for load-bearing members.
- Fabricators and contractors - to ensure weldability, galvanizing compatibility and NDT criteria are met.
- Procurement and quality inspectors - to verify inspection documents, test reports and compliance with contractual options.
Related standards
Keywords: ISO 12633-1, hot-finished structural hollow sections, non-alloy steels, fine grain steels, technical delivery conditions, chemical composition, mechanical properties, weld testing, tube inspection.
Open preview (PDF)Hot-finished structural hollow sections of non-alloy and fine grain steels — Part 1: Technical delivery conditions