S32205, S31803, 1.4462
2022-08-31
S32205、S31803（1.4462）
Summary Alloy S32205 S31803 is a 22% chromium, 3% molybdenum, 5-6% nickel, nitrogen alloyed duplex stainless steel with high general, localized, and stress corrosion resistance properties in addition to high strength and excellent impact toughness.
Alloy S32205 S31803 provides pitting and crevice corrosion resistance superior to 316L or 317L austenitic stainless steel in almost all corrosive media. It also has high corrosion and erosion fatigue properties as well as lower thermal expansion and higher thermal conductivity than austenitic. The advantage of a duplex structure is that it combines the favorable qualities of a ferritic alloy stress corrosion cracking resistance and high strength with austenitic alloy ease of fabrication and corrosion resistance.
Duplex S32205 S31803 is a nitrogen enhanced duplex stainless steel that was developed to combat common corrosion problems encountered with the 300 series stainless steel. “Duplex” describes a family of stainless steel that are neither fully austenitic, like 304 stainless, nor purely ferritic, like 430 stainless steel. The structure of 2205 duplex stainless steel consists of austenitic pools surrounded by a continuous ferritic phase. In the annealing condition, 2205 contains approximately 40-50% ferrite. Ofen referred to as the work horse grade, 2205 is the most widely used grade in the duplex stainless steel tube.
Products
omposition Wt,% S32205 Composition % according to ASTM A789 ASTM A790
C Si Mn P S Cr Mo Ni N Cu
Min 22.00 3.00 4.50 0.14
Max 0.03 1.00 2.00 0.030 0.020 23.00 3.50 6.50 0.20
S31803 Composition % according to ASTM A789 ASTM A790
C Si Mn P S Cr Mo Ni N Cu
Min 21.00 2.50 4.50 0.08
Max 0.03 1.00 2.00 0.030 0.020 23.00 3.50 6.50 0.20
UNS Psi Mpa Ksi
S32205 95000 655 95
S31803 90000 620 95
UNS Psi Mpa Ksi Elongation
in 2 in
(min.)% Max.
Hardness Modulus of Elasticity
(x 106 psi) Mean
Coefficient
of Thermal
Expansion
(IN_/IN_/℉ x10-6)
S32205 70000 485 70 30 28Rc
30*Rc 27.5 7.6
S31803 90000 450 70 30 28Rc
30*Rc 27.5 7.6