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Duplex stainless steel tube(seamless tube and welded tube) can be divided into four types: low alloy, medium alloy , high alloy, and super duplex stainless steel type. The main characteristic of the duplex stainless steel tube is that its yield strength can reach 400-55OMPa, which is twice that of ordinary stainless steel, so it can save materials and reduce equipment manufacturing costs. In terms of corrosion resistance, especially for poor conditions of the medium (such as seawater and high chloride ion content), the resistance to pitting, crevice corrosion, stress corrosion, and corrosion fatigue of duplex stainless steels is significantly better than that of ordinary austenite, as good as high-alloy austenitic stainless steels.
Centerway steel co.,ltd can provide duplex stainless steel pipes and plates of various standards and grades, passed ISO9001, SGS and other certificates, accept third-party testing, has complete testing and testing facilities, from product development, raw material supply, production process management, etc. in accordance with international quality The system standards are standardized to provide customers with satisfactory pre-sale, in-sale and after-sale services. Feel free to contact us anytime
ASTM A789/SA789 - Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
ASTM A790/SA790 - Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
ASTM A928 (ASME SA928) - Standard Specification for Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal
Steel Grade:
Duplex 2507 (UNS S32750) is a super duplex stainless steel with 25% chromium, 4% molybdenum, and 7% nickel designed.
Duplex 2205 (UNS S31803), or Avesta Sheffield 2205 is a ferritic-austenitic stainless steel.
SUPER DUPLEX UNS S32760 - is a super duplex stainless steel, so-called due to its higher Chromium and Molybdenum content.
Chemical Composition for Duplex Stainless Steel Pipe (%) :
|
|
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Mo |
N |
Cu |
|
UNS S32101 |
0.03max |
2.0max |
0.03max |
0.03max |
1.0max |
20.0~23.0 |
1.0~3.0 |
0.6max |
0.05~0.17 |
1.0max |
|
UNS S31803 |
0.03max |
2.0max |
0.03max |
0.02max |
1.0max |
21.0~23.0 |
4.5~6.5 |
2.5~3.5 |
0.08~0.20 |
/ |
|
UNS S32205 |
0.03max |
2.0max |
0.03max |
0.02max |
1.0max |
22.0~23.0 |
4.5~6.5 |
3.0~3.5 |
0.14~0.20 |
/ |
|
UNS S32750 |
0.03max |
1.2max |
0.035max |
0.02max |
0.8max |
24.0~26.0 |
6.0~8.0 |
3.0~5.0 |
0.24~0.32 |
0.5max |
|
Grade |
Tensile strength, min., ksi [MPa] |
Yield strength, min., ksi [MPa] |
Elongation in 2 in., or 50mm, min, % |
Hardness, Max Brinell |
|
S31803 |
90 [620] |
65 [450] |
25 |
290 |
|
S32205 |
95 [655] |
70 [485] |
25 |
290 |
|
S31500 |
92 [630] |
64 [440] |
30 |
290 |
|
S32550 |
110 [760] |
80 [550] |
15 |
297 |
|
S31200 |
100 [690] |
65 [450] |
25 |
280 |
|
S31260 |
100 [690] |
65 [450] |
25 |
290 |
|
S32001 |
90 [620] |
65 [450] |
25 |
290 |
|
S32304 |
100 [690] |
65 [450] |
25 |
290 |
|
S32750 |
116 [800] |
80 [550] |
15 |
310 |
|
S32760 |
109 [750] |
80 [550] |
25 |
300 |
|
S32950 |
100 [690] |
70 [480] |
20 |
290 |
|
S32520 |
112 [770] |
80 [550] |
25 |
310 |
