ISO 11772:2024

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

• ISO 630 series (structural steels)
• ISO 7452 (tolerances on dimensions and shape)
• ISO 7788 (surface finish)
• ISO 10474 (inspection documents)
• ISO 17577 (ultrasonic testing of steel flat products)

Keywords: ISO 11772:2024, longitudinally profiled steel plate, LP steel plate, hot-rolled, tolerances, dimensions, structural steel.