Materials database

High-strength low-alloy weathering steel. Forms a stable protective rust patina eliminating the need for paint. Cu-Cr-Ni-V composition provides 4-8x atmospheric corrosion resistance vs carbon steel. Used for unpainted bridges, architectural facades, sculptures, outdoor structures, and freight cars.

Entry-level structural weathering steel with minimum yield strength 235 MPa and impact testing at 0°C. The most economical weathering steel grade. Forms a protective patina eliminating painting costs. Used for general outdoor structural work, fencing, landscaping features, garden walls, and non-critical architectural applications where atmospheric corrosion resistance is desired.

Entry-level structural weathering steel with minimum yield strength 235 MPa and impact testing at -20°C (J2 designation). Improved low-temperature toughness compared to S235J0W. Used for outdoor structural applications in colder climates where basic strength with atmospheric corrosion resistance is sufficient.

Structural weathering steel with minimum yield strength 355 MPa and impact testing at 0°C (J0 designation). Same composition and corrosion resistance as S355J2W but with less stringent impact requirements. Forms a self-healing protective patina. Used for general outdoor structural applications, containers, and architectural cladding where extreme low-temperature toughness is not required.

Structural weathering steel with enhanced phosphorus content for accelerated patina formation and superior atmospheric corrosion resistance. Minimum yield strength 355 MPa with impact testing at 0°C. WP designation indicates higher P content (0.06-0.15%) compared to W grades. Available only as flat products up to 12mm thickness. Special welding precautions required due to elevated P. Used for severe atmospheric exposure, coastal (non-marine) structures, architectural facades, and applications requiring rapid patina development.

The most widely used structural weathering steel with minimum yield strength 355 MPa and impact testing at -20°C (J2 designation). Forms a protective patina of stable rust that eliminates the need for painting. Cu, Cr, and P additions provide atmospheric corrosion resistance up to 8 times that of plain carbon steel. Used for unpainted bridges, outdoor sculptures, railway wagons, architectural facades, transmission towers, and containers. Equivalent to ASTM A588 / Corten B.

Structural weathering steel with enhanced phosphorus content for accelerated patina formation and impact testing at -20°C (J2 designation). Same enhanced P content as S355J0WP but with guaranteed low-temperature toughness. Available only as flat products up to 12mm thickness. Used for unpainted bridges, outdoor sculptures, and architectural applications in colder climates where rapid, durable patina formation is desired.

High-toughness structural weathering steel with minimum yield strength 355 MPa and impact energy 40J at -20°C (K2 designation). The toughest standard weathering grade, with higher impact requirements than S355J2W (27J). Same atmospheric corrosion resistance. Used for safety-critical unpainted structures in cold climates: bridges, offshore wind foundations, and major infrastructure projects.