The product

A high-strength weathering steel for long-term structures

Engineered to resist atmospheric corrosion

QWERNOX is an alloy structural weathering steel engineered to resist atmospheric corrosion while carrying high structural loads reliably over decades. It combines mechanical strength, toughness and weldability with reduced maintenance requirements, making it a preferred choice for infrastructure exposed to the elements.

Available in yield strength classes ≥ 355 MPa and ≥ 460 MPa, QWERNOX is designed for bridges, civil engineering works, architecture and urban projects where durability and visual character are equally important.

Weathering as a strength

The name QWERNOX reflects its nature. The “W” stands for weathering, the controlled transformation of time and exposure into protection. Alternating wet and dry cycles gradually build a stable oxide layer on the surface of the steel. This patina slows further corrosion and protects the underlying material without the need for artificial coatings.

Inspired by the oak tree, known for its longevity and resilience, QWERNOX does not merely withstand the seasons. It evolves with them. Rain, sun and wind contribute to its protection, layer after layer, turning time into an ally.

Standards

  • EN 10025-5
  • ASTM A588
  • CSA G40.21

Where QWERNOX is used

QWERNOX is used in structural applications where durability, strength and long-term reliability are essential, including:

  • bridges and transport infrastructure,
  • civil engineering structures,
  • architectural façades and public buildings,
  • urban and artistic installations.

    • Learn more about the applications here

    DIMENSIONAL RANGE

    Designation Grade Del. cond. Thickness (*) Width Length

    QWERNOX 355

    S355 J0W/J2W/K2W/J4W/J5W

    N NR TM

    5 – 150 mm

    up to 4 m

    up to 20 m

    QWERNOX 460

    S460 J0W/J2W/K2W/J4W/J5W

    TM
    TM+ACC

    8 – 100 mm

    up to 4 m

    up to 16 m

    (*) higher values than those specified
    may be supplied upon agreement.
    Remark: not all combinations are
    technically feasible

    Delivery conditions optimization

    QWERNOX plates are supplied in the following delivery conditions:

    Normalised or normalised rolled

    • Homogeneous ferritic–pearlitic microstructure
    • Reliable toughness and mechanical consistency across the thickness range

    Thermomechanically Controlled Process (TMCP)

    • Refined grain structure (ferritic-pearlitic or ferrite-bainite)
    • Enhanced strength and toughness, including in thicker plates
    • Possibility to apply accelerated cooling to optimise impact resistance

    MECHANICAL PROPERTIES

    Designation Grade Yield Strength Re (MPa) Tensile Strength Rm (MPa) Elongation A5 (%)

    QWERNOX 355

    S355W

    ≥ 355

    470 – 630

    ≥ 20

    QWERNOX 460

    S460W

    ≥ 460

    530 – 710

    ≥ 17

    QWERNOX reaches a typical corrosion index of 6.2–6.3 (ASTM G101), confirming its high intrinsic resistance to atmospheric conditions. For other properties like impact energy, please consult to discover datasheets.