Overview
ISO 10799-1:2011 specifies the technical delivery conditions for cold-formed welded structural hollow sections of circular, square or rectangular form made from non-alloy steels and fine grain steels. It applies to sections formed cold without subsequent heat treatment and defines the required steel grades, chemical composition and mechanical properties (detailed in Annexes A and B). ISO 10799-1 covers what must be supplied, inspected and documented when ordering and delivering these structural hollow sections.
Key topics and requirements
- Scope and product types: cold-formed welded structural hollow sections (CFCHS, CFRHS) in circular, square or rectangular shapes.
- Steel grades & classification:
- Non-alloy steels: qualities JR, J0, J2 (differ by impact requirements and impurity limits).
- Fine grain steels: qualities N, NL, M, ML (normalized or thermomechanically rolled, with low‑temperature impact distinctions).
- Designation format: e.g., ISO 10799-1 S275 JO H or ISO 10799-1 S355 NL H - includes standard reference, structural steel symbol (S), minimum yield strength (for thickness ≤16 mm), impact/rolling codes and H for hollow section.
- Purchaser information: mandatory details such as quantity, length/type, product form, steel designation, dimensions, options and inspection document type (see Clause 5).
- Options: product analysis, carbon equivalent limits, cast analysis reporting, impact verification, galvanizability, weld repair restrictions and specific inspection/testing options.
- Delivery & testing requirements: chemical composition, mechanical properties, technological properties, surface condition, non‑destructive weld testing, tolerances, marking and inspection procedures (sampling, test methods referenced).
Practical applications and who uses this standard
- Manufacturers and mill producers use ISO 10799-1 to define production and delivery specifications for cold-formed welded hollow sections.
- Steel fabricators and structural engineers refer to it for material selection, compliance with impact and mechanical property requirements, and correct designation.
- Procurement and QA/inspection teams use the standard to set order requirements, inspection documentation and acceptance tests.
- Project specifiers and code writers include these delivery conditions in contracts for building, bridge, offshore and general structural applications where cold-formed hollow sections are specified.
Related standards
Using ISO 10799-1 ensures consistent, verifiable supply of cold-formed welded structural hollow sections with clear requirements for composition, mechanical performance, inspection and documentation.
Open preview (PDF)Cold-formed welded structural hollow sections of non-alloy and fine grain steels — Part 1: Technical delivery conditions
