Overview
ISO 11772:2024 - Hot-rolled longitudinally profiled steel plate - defines requirements for hot-rolled longitudinally profiled (LP) steel plates used for general structural and engineering purposes. The standard applies to LP steel plates with thicknesses from 4 mm to 400 mm, covering product designation, dimensions, tolerances, technical delivery conditions and inspection/test methods for plates that have regular changes in thickness along the rolling (longitudinal) direction.
Key topics
- Scope & classification
- Covers LP steel plates (types 01–10 are illustrated), including equal-thickness and variable-thickness sections.
- Typical designation format: [steel grade]-LP[type] (example: S235-LP01).
- Dimensions & identification
- Identification methods include nominal thickness × width × length or thickness/slope × width × length for commonly used types.
- Annex A lists applicable dimensions; Annex B gives methods for nominal-dimension calculation for variable-thickness sections.
- Tolerances & shape
- Thickness and dimensional tolerances conform to ISO 7452 Class D; flatness tolerances to ISO 7452 Class N.
- Edge camber, out-of-squareness and width/length tolerances also reference ISO 7452.
- Technical requirements
- Chemical composition and delivery conditions reference the ISO 630 series (Parts 1–6) for structural steels.
- Plates are delivered by calculated mass (calculation methods in Annex C).
- Surface quality, internal soundness and mechanical properties are specified; internal soundness inspection uses appropriate ultrasonic methods.
- Inspection & test methods
- Clause 9 details measurement and test methods for thickness, width, total length, flatness, edge camber, out-of-squareness, mass calculation and internal soundness.
- Purchaser information
- Purchasers must specify reference to ISO 11772:2024, steel grade, delivery conditions, nominal dimensions/type, quantity, marking and special requirements.
Applications
ISO 11772:2024 is intended for:
- Structural and civil engineering elements requiring variable-thickness plates (bridges, building sections)
- Heavy engineering and machinery components where weight optimization or section profiling is needed
- Shipbuilding, offshore structures and fabricated assemblies that use profiled plates to improve performance or reduce weight
Who uses this standard
- Steel producers and plate mills fabricating hot-rolled LP plates
- Procurement and quality teams specifying and accepting plate deliveries
- Structural engineers, fabricators and inspectors responsible for material conformity and testing
Related standards
Keywords: ISO 11772:2024, longitudinally profiled steel plate, LP steel plate, hot-rolled, tolerances, dimensions, structural steel.
