ASTM A790/789 UNS S31803 Duplex Steel Pipe/Tube

ASTM A790/789 UNS S31803 duplex pipe/tube, also named S31803 duplex pipe, astm a790 s31803 and astm a789 S31803 pipe, is a nitrogen-enhanced ferritic-austenitic duplex stainless steel tubular product defined by official ASTM standards. It owns a balanced 50/50 two-phase microstructure, solving common corrosion issues of traditional 300-series austenitic stainless steels.

As a core performance indicator, the density of astm a790 uns s31803 pipe and s31803 duplex steel tube is strictly controlled at 7.72-7.95 g/cm³, which exactly falls in the 1%-2% standard tolerance range for industrial duplex steel pipes. This precise density control guarantees stable mechanical properties and accurate engineering weight calculation.

Different from regular austenitic stainless steel pipes, this S31803 series has minimum yield strength over 450MPa, far higher than 316L grade, with excellent pitting resistance and stress corrosion cracking performance. It can work stably under 600°F to avoid long-term high-temperature embrittlement risk.

KCM SPECIAL STEEL(KCMSS), the professional manufacturer and supplier, produces this full series strictly following ASTM A789/A790 latest specifications.