Duplex steel combines the best of austenitic and ferritic stainless steels, featuring a balanced microstructure that delivers exceptional strength, corrosion resistance, and durability. This unique alloy—available in grades like 2205, 2304, and 2507—offers up to twice the yield strength of 316 stainless steel, making it ideal for high-pressure, high-temperature applications in oil and gas, marine, and chemical industries. Newstar Hardware’s duplex steel products, compliant with ASTM A240 and A890, exhibit tensile strengths from 620MPa to 830MPa, with excellent impact resistance and ductility. The dual-phase structure enhances resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride environments, outperforming austenitic grades in seawater, brine, and acidic media. For example, 2205 duplex steel (UNS S32205) resists chloride-induced stress corrosion up to 30°C, while 2507 (UNS S32750) withstands higher temperatures and more aggressive chlorides. These alloys find use in offshore platforms, heat exchangers, and desalination equipment. Fabrication options include welding, machining, and forming, with post-weld heat treatment available to optimize microstructure. Rigorous testing (including ferrite content analysis) ensures compliance with international standards for critical applications.
