Characteristics of JIS G3114 SMA490AP Steel
Excellent Weather Resistance
As a Japanese standard hot-rolled steel plate for welded structures with atmospheric corrosion resistance, it forms a dense oxide film by adding alloying elements such as copper (Cu 0.20-0.35%) and chromium (Cr 0.30-0.55%). This significantly enhances its resistance to atmospheric corrosion, making it suitable for steel structures exposed to harsh environments for extended periods.
Balanced Mechanical Properties
Yield Strength: ≥365 MPa for thickness ≤16 mm; ≥355 MPa for 16 < thickness ≤40 mm; ≥335 MPa for 40 < thickness ≤75 mm.
Tensile Strength: 490-610 MPa, far exceeding that of ordinary carbon steel (e.g., Q235 at 375-500 MPa), enabling it to withstand higher tensile loads.
Elongation: ≥19%, ensuring plastic deformation under stress without brittle fracture.
Outstanding Weldability
With a low carbon equivalent (≤0.41%) and low sulfur (S ≤0.035%) and phosphorus (P ≤0.035%) content, it minimizes the risk of welding cracks. It supports manual welding, automated processes (e.g., CO₂ arc welding, submerged arc welding), and laser welding, eliminating the need for preheating or complex heat treatment and reducing construction costs.
Wide Processing Adaptability
It is available in various delivery conditions, including hot-rolled (AR), normalized (N), thermomechanical controlled processing (TMCP), and quenched + tempered (Q+T), meeting diverse application requirements.
