Structural steels with enhanced atmospheric corrosion resistance (weathering steels) are specified by the following ASTM standards:
ASTM A 242/A 242M Standard Specification for High-Strength Low-Alloy Structural Steel
ASTM A 588/A 588M Standard Specification for High-Strength Low-Alloy Structural Steel with 50 ksi [345 MPa] Minimum Yield Point to 4-in. [100-mm] Thick
ASTM standards can be obtained directly from ASTM at