Duplex steel, a steel composed of martensite, austenite or bainite with a ferrite matrix in two phases.Duplex stainless steel has the advantages of both ferritic stainless steel and austenitic stainless steel, which combines the excellent toughness and weldability of austenitic stainless steel with the higher strength and chloride stress corrosion resistance of ferritic stainless steel.SMLSCO's S31803,S32205 stainless steel seamless pipes are duplex steel.
C
Si
Mn
P
S
Cr
Ni
Mo
N
S31803
0.03
1.00
2.00
0.03
0.02
21.0-23.0
4.5-6.5
2.5-3.5
0.08-0.2
S32205
0.03
1.00
2.00
0.03
0.02
22.0-23.0
4.5-6.5
3.0-3.5
0.14-0.2
Super Duplex Steel
Super duplex stainless steel is PREN>40, containing 25% Cr and high molybdenum (>3.5%), high nitrogen (0.22% ~ 0.30%) duplex steel, the main grades are S32550, S32750 (SAF 2507) and S32760.Duplex stainless steel seamless pipe has high strength and corrosion resistance and is mainly used in chemical processing, petrochemical and subsea equipment.
