Our NORSOK-approved Super Duplex alloy 2507 tubes (UNS 32750) are custom-engineered for the most aggressive subsea and downhole oil and gas applications.
Advantages include:
- NORSOK-approval
- Made to order in specialist non-standard sizes
- Superior strength and corrosion resistance
- Short lead times
- Small batch sizes
With 80 years engineering expertise, we specialise in manufacturing corrosion resistant Super Duplex tubes for the increasing hostile temperature and operating environments - where maximising operating efficiency demands total product reliability.
Greater Corrosion Resistance Than Standard Duplex Grades
Super Duplex stainless like S32750, is a mixed microstructure of austenite and ferrite (50/50) which has improved strength over ferritic and austenitic steel grades. The main difference is that Super Duplex has a higher molybdenum and chromium content which gives the material greater corrosion resistance than standard duplex grades.
High Strength and Cost Effective Corrosion Resistance
The balanced duel phase microstructure combines high strength with cost effective corrosion resistance particularly in high chloride environments.
Super Duplex has the same benefits as its counterpart – it has lower alloying costs when compared with similar ferritic and austenitic grades with equipment corrosion resistance in chloride containing environments due to the material’s increased tensile and yield strength. In many cases this gives the purchaser the welcomed option of purchasing smaller thicknesses without the need to compromise on quality and performance.
Super Duplex Tubes Sizes
Our tubing sizes typical for Super Duplex range from 3.18 mm (0.125 in) to 31.75 mm (1.25 in) outer diameter OD in seamless form.
Available Tube Product form
Typical Applications
-
Offshore platforms
-
Fire-fighting systems
-
Injection & ballast water systems
-
Heat exchangers
Industries predominantly using Super Duplex
Typical Manufacturing Specifications
- ASTM A789
-
ASME SA-789
-
Also individual customer specifications.
Super Duplex Technical Data
Mechanical Properties
|
Temper |
Annealed |
|
Tensile Rm |
115 |
ksi (min) |
|
Tensile Rm |
800 |
MPa (min) |
|
R.p. 0.2% Yield |
80 |
ksi (min) |
|
R.p. 0.2% Yield |
550 |
MPa (min) |
|
Elongation (2” or 4D gl) |
15 |
% (min) |
Physical Properties (Room Temperature)
|
Temper |
Annealed |
|
Specific Heat (0-100°C) |
500 |
J.kg-1.°K-1 |
|
Thermal Conductivity |
15 |
W.m -1.°K-1 |
|
Thermal Expansion |
11 |
μm/μm/°C |
|
Modulus Elasticity |
200 |
GPa |
|
Electrical Resistivity |
8.12 |
μohm/cm |
|
Density |
7.8 |
g/cm3 |
Chemical Composition (% by weight)
|
Element |
Min |
Max |
|
C |
- |
0.03 |
|
Cr |
24 |
26 |
|
Cu |
0.5 |
1 |
| Mn |
- |
2 |
| Mo |
3 |
5 |
| N |
0.24 |
0.35 |
|
Ni |
6 |
8 |
| P |
- |
0.35 |
| S |
- |
0.015 |
|
Si |
- |
1 |