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How to choose duplex stainless steel among different types
How to choose duplex stainless steel among different alloy types
For brief introduction, duplex stainless steel refers to chemical composition of steel whose Ferrite and Austenite account for the half respectively.
First of all, let’s identify different types of duplex stainless steel in general:
Duplex stainless steel usually presents in the same column of website, and under the general column, it can be further categorized into four kinds: low-alloy type, medium-alloy type, high-alloy type and super duplex type. Below table shows native names in different markets for this material.
|
Type Country |
China |
USA |
Sweden |
Germany |
France |
Japan |
|
Low Alloy |
00Cr23Ni4N |
UNS S32304 |
SS2327(SAF2304) |
W.Nr. 1.4362 |
UR35N |
DP11 |
|
Medium Alloy |
00Cr18Ni5Mo3Si2 |
UNS S31500 |
SS2376(3RE60) |
W.Nr. 1.4417 |
UR45N |
DP1 |
|
High Alloy |
0Cr25Ni5Mo2 |
UNS S32900 |
SS2324(10RE51) |
W.Nr. 1.4460 |
|
329J1 |
|
Super Duplex Stainless Steel |
00Cr25Ni7Mo4N |
UNS S32750 |
SS2328(SAF2507) |
W.Nr. 1.4410 |
UR47N+ |
|
Secondly, after knowing the type you might have interest in, check the chemical analysis and physical performance you favor in your application and industries:
|
Chemical Composition(%) |
|||||||||
|
Steel Grade |
C ≤ |
Mn ≤ |
Si ≤ |
P ≤ |
Cr ≤ |
Ni ≤ |
Mo ≤ |
Cu ≤ |
N ≤ |
|
S32750(SAF2507) |
0.03 |
1.2 |
0.8 |
0.02 |
24.0-26.0 |
6.0-8.0 |
3.0-5.0 |
0.5 |
0.24-0.32 |
|
S31803(SAF2205) |
0.03 |
2.0 |
1.0 |
0.02 |
21.0-23.0 |
4.5-6.5 |
2.5-3.5 |
|
0.08-0.20 |
|
S31500(3RE60) |
0.03 |
1.2-2.0 |
1.4-2.0 |
0.03 |
18.0-19.0 |
4.25-5.25 |
2.5-3.0 |
|
0.05-0.10 |
|
Physical(Mechanical) Performance |
|||||||||
|
Steel Grade Item |
Heat Treatment System |
T.S (Mpa) ≥ |
Y.S (Mpa) ≥ |
EL ≥ |
≤ Hardness ≤ |
||||
|
Brinell |
Rockwell |
||||||||
|
S32750(SAF2507) |
1025-1125°C |
800 |
550 |
15 |
310 |
32 |
|||
|
S31803(SAF2205) |
1020-1100°C |
620 |
450 |
25 |
290 |
30.5 |
|||
|
S31500(3RE60) |
980-1040°C |
630 |
440 |
30 |
290 |
30.5 |
|||
Thirdly, after checking above all data, you may decide what material is best for you. However, if you are still not clear which type is best for you, please check the commonly used industries for above material:
|
Commonly Applied and Used Industries |
|
|
Steel Grade |
Industries |
|
S31803(SAF2205) |
Pressure vessels, high-pressure storage tanks, high-pressure pipelines, heat exchangers, oil and gas pipelines, sewage treatment machines. |
|
S32750(SAF2507) |
Petroleum and natural gas industry, offshore oil platforms, petrochemical equipment, desalination equipment. |