Weathering Steel Plate

Q355GNH/Q355NH Weathering Steel Plate

GB Q355GNH/Q355NH weathering steel plate with dense protective patina for railway vehicles, containers and facade structures.

Q355GNH and Q355NH are the Chinese weathering steels under GB/T 4171 - the same self-protecting patina idea as Corten, with GB chemistry and 355 MPa yield. GNH typically serves as coil and sheet for rolling into parts; NH is the plate version for structural work.

Grades and Standards

  • GB/T 4171 Q355GNH, Q355NH
  • Impact tested variants for cold regions

Sizes and Supply

  • Thickness 3-60 mm, widths 1500-2500 mm
  • Cut-to-size and bending for facade panels and carrier beams

Quality Documents

EN 10204 3.1 MTC with the weathering element analysis (Cu, P, Cr, Ni, Mo balance) shown per heat.

Where This Plate Goes

  • Railway wagons and rolling stock
  • Containers and transport equipment
  • Facade cladding and external structures
  • Landscape architecture and outdoor furniture frames

Questions Buyers Ask

Q: Will it stain adjacent concrete? A: During the first rains, yes - rust runoff is real. Detail drip paths and wash zones, or pre-weather horizontally before installation.
Q: Q355NH or A588? A: Functionally parallel; pick by your project's governing standard. We produce both.
RFQ with thickness, dimensions and exposure type gets a same-week answer.