ASTM A242 Steel Plates China

High-strength, weathering structural steel plate produced to ASTM A242 for applications where improved atmospheric corrosion resistance is required. ASTM A242 plates are low-alloy, hot-rolled structural steel designed to form a protective rust patina in outdoor exposure, reducing maintenance and paint requirements while retaining structural performance.

Key features

• Weathering (atmospheric corrosion-resistant) low-alloy steel with superior resistance to rusting compared with ordinary carbon steels (e.g., A36, A572 GR50).
• Hot-rolled plates available in ASTM A242 Type 1 and Type 2 materials.
• Designed for use in unpainted or lightly maintained exterior structures where the natural patina can provide corrosion protection.

Mechanical properties (minimum, per ASTM A242 specification)

• Tensile strength (minimum): 70 ksi for thickness ≤ 3/4 in; 67 ksi for > 3/4 in up to 5 in; 63 ksi for thickness > 5 in.
• Yield strength (minimum): 50 ksi for thickness ≤ 3/4 in; 46 ksi for > 3/4 in up to 5 in; 42 ksi for thickness > 5 in.
• Elongation: per ASTM A242 thickness-specific requirements (buyers should request the certificate of compliance for exact elongation values for the intended plate thickness).

Typical applications

• Bridges, building and industrial structures, towers and other exposed structural members where long-term atmospheric exposure is expected.
• Outdoor equipment, architectural elements and infrastructure components where reduced maintenance coatings are desirable.

Quality and supply notes

• Supplied as hot-rolled plates conforming to ASTM A242 chemical and mechanical requirements. Buyers should request mill test certificates (MTC) and dimensional tolerances for inspection and project compliance.
• Available in both A242 Type 1 and Type 2; thickness and dimensional availability varies by mill and stock. For RFQ include required grade (Type 1 or Type 2), thickness, length, width, and any special inspection or packaging requirements.

Ordering guidance

• For accurate pricing and lead times, provide target plate dimensions, quantity, delivery port or destination, required third-party inspection (if any), and desired documentation (MTC, ultrasonic test reports, etc.).