Products Catalog

Specification

Duplex Pipe/ Duplex Tube/ Super Duplex Pipe/ Stainless Duplex Pipe

Standards: ASTM/ ASME A789/ SA789, A790/ SA790, A450, A530

Material: UNS S32750, 2205, UNS S31803( Cr22Ni5Mo3) ; UNS S31500( Cr18NiMo3Si2)

Chemical Composition

Grade
C

max
Si

max
Mn

max
P

max
S

max
Cr
Ni
Mo
N

UNS S32750
0.030
0.8
1.2
0.030
0.015
24.0-26.0
6.0-8.0
3.0-5.0
0.24-0.32

UNS S31803
0.030
1.0
2.0
0.020
0.020
21.0-23.0
4.5-6.5
2.5-3.5
0.08-0.20

UNS S31500
0.030
1.0
1.2-2.0
0.030
0.030
18.0-19.0
4.5-5.5
2.5-3.5
0.05-0.10

Ph ysical Properties

Grade
Y.S.MPa min
T.S.Mpa min
Elongation %
Hardness HRC

UNS S32750
550
800
15
20

UNS S31803
450
620
25
20

UNS S31500
440
630
30
20

Stainless steel duplex pipes are with high mechanical strength, good elongation and weld ability which needs no pre-heating before welding and heat treatment after welding, low thermal expansion, excellent resistance to stress corrosion cracking, pitting and crevice corrosion, and high resistance to general corrosion in different environments. Duplex stainless steel tubes and pipes are applied to heat exchangers in refinery industries, petrochemical plants, paper and pulp industries, sugar and beverage industries.