Super duplex steel BSP/NPT fittings contain 25% chromium, 7% nickel, 3% molybdenum, and trace amounts of nitrogen and tungsten, for excellent corrosion resistance Their mechanical properties include high tensile strength (620). -795 MPa) and excellent yield strength ( 450-550 MPa is practical. ) are being developed, making them ideal for hard surfaces These features combine the advantages of austenitic and ferritic steels, and provides superior strength, stress corrosion resistance, and fatigue strength Benefits include extended service life, suitability for high-pressure applications, and excellent performance in harsh marine or chemical environments .