Super Duplex Steel Pipes & Tubes
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.
| Manufacturing Standards | ASTM, EN, DIN, BS, GOST |
| Sizes | from 1/2″ up to 102″ / SCH STD up to SCH160/XXS / 1.5mm to 60.0mm |
| Availability | up to 24” Seamless & from 24” to 102” SAW/ERW Welded – Ends Bevelled / Plain – Stock / Production |
| Lengths | SRL 5-7 metres and DRL 9-13 metre |
Available Tube Product form
- Straight
- Seamless
- Seam welded, cold redrawn and annealed
- Offshore platforms
- Fire-fighting systems
- Injection & ballast water systems
- Heat exchangers
- Oil and gas
- Chemical processing
- General Engineering
- 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 |
