Duplex Stainless Steel Pipe

Duplex stainless steel pipe always applied in harsh environment, like low temperature, high temperature and corrosion situation, 2205 is most common duplex stainless steel for pipes and tubes, high strength and excellent corrosion resistance to match applications.

Duplex Stainless Steels are characterized by Austenitic stainless steels and Ferritic stainless steels, high chromium (18–30%) and molybdenum (up to 5%) and lower nickel contents (3% – 10%) than Austenitic stainless steels, there are Lean Duplex, Standard Duplex, Super Duplex, Hyper Duplex.

duplex stainless steel pipe

Duplex stainless steel pipe have many advantages compared with other stainless steels pipe, so they are used more and more wide for many industries, our duplex stainless steel pipe specifications include ASTM A789 and A790 for general service, both seamless and welded type, S31803, 2205 stainless steel pipe is most used.

duplex stainless steels chemical composition

Designation Chemical composition % by mass max unless stated
UNS No AISI No / Common Name C Si Mn P S Cr Mo Ni Others
S32101 LDX 2101 0.040 1.00 4.0/6.0 0.040 0.030 21.0/22.0 0.10/0.80 1.35/1.70 N 0.20/0.25; Cu 0.10/0.80
S32202 DX 2202 0.030 1.00 2.00 0.040 0.010 21.5/24.0 0.45 1.00/2.80 N 0.18.0.26
S32205 2205 UR45N 0.030 1.00 2.00 0.030 0.020 22.0/23.0 3.0/3.5 4.5/6.5 N 0.14/0.20
S32304 2304 0.030 1.00 2.50 0.040 0.030 21.5/24.5 0.05/0.60 3.0/5.5 N 0.05/0.20; Cu 0.05/0.60
S32404 Uranus 50 0.04 1.0 2.0 0.030 0.010 20.5/22.5 2.0/3.0 5.5/8.5 N 0.20; Cu 1.0/2.0
S32520 Uranus 52N+ 0.030 0.80 1.50 0.035 0.020 24.0/26.0 3.0/4.0 5.5/8.0 N 0.20/0.35; Cu 0.50/2.00
S32550 Ferralium 255 0.04 1.00 1.50 0.040 0.030 24.0/27.0 2.9/3.9 4.5/6.5 N 0.10/0.25; Cu 1.50/2.50
S32750 2507 0.030 0.80 1.20 0.035 0.020 24.0/26.0 3.0/5.0 6.0/8.0 N 0.24/0.32; Cu 0.50
S32760 Zeron 100 0.030 1.00 1.00 0.030 0.010 24.0/26.0 3.0/4.0 6.0/8.0 N 0.20/0.30; Cu 0.5/1.00; W 0.50/1.00

duplex stainless steel pipe applications

Due to duplex stainless steel excellent corrosion resistance and high strength, duplex stainless steel pipe and tube applied in many harsh environments, duplex stainless steel U bending tube and stainless steel heat exchanger tube used for refining, chemical fertilizer, paper making, petroleum, chemical industry.