when exposed to weather, eliminating the need for painting in most environments.
with high humidity or pollution.
High Strength-to-Weight Ratio:
Minimum yield strength: 345 MPa (50 ksi) – reduces material usage while maintaining structural integrity.
ASTM A588/A588M (Grades A588-A/B/C/K).
for optimized patina formation and durability.
processes (use low-hydrogen electrodes: E7018-W, ER80S-Ni1).
Preheating (100–150°C) recommended for thick plates (>20mm) to prevent hydrogen cracking.
(e.g., U.S. DOT projects)
Corten A/B (ASTM A242/A588 vs. EN 10025-5 S355J0WP/J2W) but tailored to ASTM standards.
due to reduced maintenance (no painting required after patina stabilization).
3mm–100mm sheets/plates.
Mill scale (hot-rolled) or blast-cleaned (for immediate patina initiation).
ASTM A588, AASHTO M270 Grade 345W, and international equivalents.
For critical projects, consult ASTM A588's supplemental requirements (e.g., Charpy impact testing at -40℃) and ensure proper welding/fabrication protocols to preserve corrosion resistance.
