ASTM ASME 403 Stainless Steel Pipes & Tubes

ASTM/ASME 403 Stainless Steel Pipes & Tubes are martensitic-grade (UNS S40300) products conforming to ASTM A213/A268 standards, featuring a straight chromium (11.5-13% Cr) composition with controlled carbon content (≤0.15%) for optimal strength and corrosion resistance. This heat-treatable alloy offers high tensile strength (up to 725 MPa) and good creep resistance at elevated temperatures up to 650°C (1200°F), making it particularly suitable for steam turbine blades, boiler components, and high-pressure feedwater heaters in power generation systems. The material's martensitic microstructure provides exceptional mechanical properties after quenching and tempering, while maintaining adequate resistance to oxidation and mild corrosive environments. With its balanced combination of strength, thermal stability, and moderate corrosion resistance, 403 serves as a cost-effective solution for mechanical components requiring durability in demanding thermal-mechanical service conditions, though with limited weldability compared to austenitic grades.