CortenUSA

Flats & Panels

Flats & Panels

Weathering Steel Flat Stock — ASTM A606 Type 4

CortenUSA sources and supplies cold-rolled weathering steel coil to the exact specification the metal roofing and architectural markets demand — ASTM A606 Type 4, the standard that defines true Corten performance.

A606 Type 4 is not a coated steel. It is not painted. It is a high-strength, low-alloy steel engineered at the molecular level to form a tightly bonded oxide layer — a living patina that seals the surface, arrests corrosion, and deepens in character over time. No maintenance. No touch-up. No apology.

Our coil is cold rolled to tight thickness tolerances, processed to a light oil finish, and wound on a 20″ inside diameter standard for direct compatibility with modern rollforming and coil processing equipment. Available in 24 GA and 22 GA, in master widths of 44″ and 48″, with slit-to-width capability for any finished panel width your operation requires.

Specification at a Glance

  • Standard: ASTM A606 Type 4
  • Process: Cold rolled
  • Gauge: 24 GA / 22 GA
  • Width: 44″ and 48″ master coil — slit to width available
  • Inside diameter: 20″ standard
  • Surface: Light oil
  • Tolerances: Squareness and flatness processed per ASTM specifications
  • Documentation: Mill test report available upon request

Whether you are running standing seam, corrugated, PBR, or Gulf Coast profiles — this is the coil built to run clean, coil tight, and weather beautifully for the life of the structure.

Roofing & Wall Panels

  • Custom-cut weathering steel panels
  • ASTM A606 Type 4 authentic Corten chemistry
  • Develops a rich patina with no paint required
  • For roofing, wall cladding, and architectural applications

Corrugated Panel

  • ASTM A606 Type 4 weathering steel
  • 24″ coverage, 2-1/2″ pitch, 1/2″ rib
  • Classic industrial profile
  • 24 GA & 22 GA, custom-cut to length

3/4″ Corrugated Panel

  • ASTM A606 Type 4 weathering steel
  • 35″ coverage, 2-3/4″ pitch, 3/4″ rib
  • Built for wide spans and coastal exposure
  • 24 GA & 22 GA, custom-cut to length

PBR Panel

  • ASTM A606 Type 4 weathering steel
  • 36″ coverage, 1-1/4″ rib height
  • Industry-standard structural profile
  • 24 GA & 22 GA, custom-cut to length

Soffit Panel

  • ASTM A606 Type 4 weathering steel
  • 12″ coverage, vented or non-vented
  • Clean face for eaves and overhangs
  • 24 GA & 22 GA, custom-cut to length

Standing Seam Panel

  • ASTM A606 Type 4 weathering steel
  • 12″ coverage, 1″ seam, concealed fastener
  • Premium architectural profile
  • 24 GA & 22 GA, custom-cut to length