Duplex stainless steel pipes and tubes, combining austenitic and ferritic phases, offer a unique balance of high strength, corrosion resistance, and durability for demanding industrial applications. Newstar Hardware provides grades like 2205 (UNS S32205) and 2507 (UNS S32750), manufactured to ASTM A790 and A890, with sizes from 1/2" to 24" OD and wall thicknesses up to Schedule 80. The dual-phase microstructure gives these pipes/tubes twice the yield strength of 316 stainless steel (450MPa-550MPa), while maintaining elongation over 25%, ideal for high-pressure pipelines and structural supports. Their high PREN (28-43) ensures resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride environments, outperforming austenitic grades in seawater, oil & gas, and chemical processing. 2205 pipes suit moderate chloride conditions (up to 20,000ppm), while 2507 tubes excel in extreme chlorides (up to 100,000ppm) for offshore platforms and desalination plants. Seamless and welded options are available, with NACE MR0175 compliance for sour gas applications. Surface finishes include mill, pickled, or passivated, with non-destructive testing (UT, MT) ensuring material integrity. Custom fabrication services (beveling, threading, cladding) address specific project needs, making duplex stainless steel pipes/tubes essential in safety-critical industries.
