ASTM A790 UNS32750 Duplex Stainless Steel Seamless / Welded Pipes
S32750 is a super duplex stainless steel that has a higher chromium, molybdenum, and nickel content compared to S31803. This makes it more resistant to corrosion and pitting in aggressive environments such as seawater and chemical processing plants. S31803 is a standard duplex stainless steel that is also highly resistant to corrosion and has good mechanical properties. It is commonly used in industries such as oil and gas, chemical processing, and pulp and paper.
Super Duplex Stainless Steel Pipe ASTM A790 S31803 (2205 / 1.4462), UNS S32750(1.4410)
Standards: ASTM/ASME A789/SA789, A790/SA790,A450,A530
Material: UNS S31803(Cr22Ni5Mo3/1.4462)/2205,UNS S32750(1.4410),UNS S31500(Cr18NiMo3Si2),
UNS32760(1.4501)
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 |
Physical 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 |
Duplex Stainless Steel Pipe Application:
Chemical processing, Transport and Storage.
Oil and gas exploration and offshore rigs.
Oil and gas refining.
Marine environments.
Pollution control equipment.
Pulp and paper manufacturing
Chemical process Plant
Some of the quality tests carried out by us includes:
| Corrosion Test |
Conducted only when specially requested by the client |
| Chemical Analysis |
Test done as per required quality standards |
| Destructive / Mechanical Testing |
Tensile | Hardness | Flattening | Flare | Flange |
| Reverse-bend and Re. flat tests |
Carried out in full compliance with relevant standards & ASTM A-450 and A-530 norms, which ensures trouble-free expansion, welding & use at customers end |
| Eddy Current Testing |
Done to detect homogeneities in subsurface by using Digital Flaw-mark Testing System |
| Hydrostatic Testing |
100% Hydrostatic Testing carried out according to ASTM-A 450 norms for checking tube leakage, and biggest pressure we can support 20Mpa/7s . |
| Air Under Pressure Test |
To check any evidence of air leakage. |
| Visual Inspection |
After passivation, every single length of tubes & pipes is subjected to thorough visual inspection by trained staff for detecting surface flaws & other imperfections |
Supplementary Testing : Apart from the above mentioned tests, we also carry out on the manufactured products supplementary testing. The tests conducted under this include:
- Eddy Current Testing
- O.P Testing
- Radiography Testing
|
- Corrosion Testing
- Micro Testing
- Macro Testing
|
- IGC Testing
- Ultrasonic testing
- Liquid Penetrate testing
|
