The supply conditions of S355J0WP weathering steel are quite comprehensive to meet various engineering requirements, including the following main forms:
Hot-rolled condition (HR):
The most common supply form for structural applications
Features mill scale that preserves the steel's original weathering characteristics
Typical products: hot-rolled steel plates, sections (H-beams, angle steels, etc.)
Normalized condition (N/NR):
Recommended for thicker specifications (typically ≥16mm)
Improves microstructural homogeneity and low-temperature toughness through normalizing
Particularly suitable for critical load-bearing components
Controlled rolled condition (CR):
Achieves refined grain structure through controlled rolling process
Combines good strength with toughness
Offers better surface quality than conventional hot-rolled products
Shot-blasted/sand-blasted condition:
Mechanically cleaned surface scale
Facilitates welding and pre-treatment for coating
Commonly used when immediate uniform rust appearance is desired
Pre-weathered condition:
Factory-applied accelerated weathering treatment
Provides stabilized rust layer immediately after installation
Prevents initial rust runoff on site
Additional supply options may include:
Cut-to-size plates with processed edges
Pre-fabricated structural elements
Custom surface treatments (e.g., chemical patination)
Third-party certified materials with enhanced testing
The selection of supply condition depends on:
Application requirements (structural, architectural, etc.)
Environmental exposure conditions
Fabrication methods (welding, forming needs)
Aesthetic considerations for visible surfaces
