Its a metallic tube made up of super duplex grade stainless steel. The DSS is used in applications to combine the advantages of ferritic steel and austenitic steel types. Naman Pipe & Tubes is a manufacturer and supplier of duplex pipes and tubes in various grades. There are standard, lean and super duplex materials available in seamless and welded conditions. The Super Duplex Seamless tube components are cold drawn and could be cold worked to improve the strength. The SDSS Welded tube components on the other hand are hot rolled and could be strengthened by heat treatment.
The major difference is that the seamless pipes have less absolute roughness or high precision. Our Super Duplex Tubing is used in various industries, especially the ones with high chloride ion rich environments. The sea water and marine applications prefer duplex materials because the corrosion stress resistance is very high with duplex pipes and tubes. There are SDSS Instrument Tubing materials that are used in producing different instruments used in boats, ships, medical industries and in petrochemical industries as well. The ASTM A789 Super Duplex Tube is manufactured by us to abide by the stress corrosion resistant grades with particular nominal wall thicknesses. Please contact us with your requirements or inquiries.
Table of contents
Why super duplex tubing is known as high alloy tubing?
Super duplex is a grading category of duplex steel material. The duplex is a material combination of austenitic and ferritic steel structures. The super duplex grades have high amounts of chromium, nickel and molybdenum contents in their composition. For instance, the super duplex 2507 tubes has 25% chromium, 7% nickel, 4% molybdenum and 0.27% nitrogen.
The high amount of alloying allows the other elements to be in only very less amounts. This combination brings about high toughness, corrosion resistance, heat resistance and durability to the material. Therefore the super duplex tubing is also known as the high alloy tubing because of the high mechanical and chemical properties of the alloys.
Super Duplex Tubes Sizes and tolerances
Outside Diameter
12 to 260 mm (0.472 to 10.24 in.)
Wall Thickness
2-20 mm (0.0787-0.787 in.)
Tolerances: Hot finished
OD +/- 1%, WT +/-12.5%
Tolerances: Cold finished
OD +/-0.75%, WT +/-10%
Super Duplex Tubing Specifications
| Standard Specifications | ASTM A 789 ASME SA 789 |
| Standard | DIN ISO GB JIS BA ANSI |
| Type | Seamless / ERW/ Welded / DOM / EFW / Fabricated / CDW / CEW / Superheater / Reheater Tubes |
| Length available | up to 16 meters |
| Material Color | Nickel White |
| Brand Name | NAMAN |
| Surface Finishing | Fine |
Different Types of SDSS Tubing
Super Duplex Stainless Steel Tubing
- Subsea Tubes
- Hydraulic Tubing
- Instrumentation Tubing
- Umbilical Tubing
- Mechanical Tubing
- Superheater Tubes
- Coiled Tubing
Super Duplex Stainless Steel Tubes
- Composite Tubes
- Condenser Tubes
- Evaporator Tubes
- Finned Tubes
- Boiler Tubes
- Capillary Tubes
- Instrument Tubing
Super Duplex Stainless Steel Tubing Price in India
| Manufacturing Type | Price INR/kg |
|---|---|
| Tubing (Coiled / Straight) | INR 700-1500 Per Kg |
Super Duplex Tubing ready stock and standard sizes
| outside diameter, mm |
wall thickness, mm |
inside diameter, mm (nominal) | Thread ISO | Kg/meter |
|---|---|---|---|---|
| 13.5 | 2.35 | 8.8 | 1/4 in. | 0.66 |
| 17.2 | 2.35 | 12.5 | 3/8 in. | 0.87 |
| 21.3 | 1.6 | 18.1 | 1/2 in. | 0.79 |
| 21.3 | 2.65 | 16.0 | 1/2 in. | 1.24 |
| 26.9 | 1.6 | 23.7 | 3/4 in. | 1.01 |
| 26.9 | 2.0 | 22.9 | 3/4 in. | 1.24 |
| 26.9 | 2.65 | 21.6 | 3/4 in. | 1.61 |
| 26.9 | 3.2 | 20.5 | 3/4 in. | 1.90 |
| 30.0 | 2.0 | 26.0 | 1.40 | |
| 33.7 | 2.0 | 29.7 | 1.59 | |
| 33.7 | 2.6 | 28.5 | 2.03 | |
| 33.7 | 3.25 | 27.2 | 2.48 | |
| 33.7 | 4.05 | 25.6 | 3.01 | |
| 38.0 | 2.6 | 32.8 | 2.31 | |
| 42.4 | 2.0 | 38.4 | 1¼ in. | 2.01 |
| 42.4 | 3.25 | 35.9 | 1¼ in. | 3.19 |
| 44.5 | 2.0 | 40.5 | 2.13 | |
| 44.5 | 2.9 | 38.7 | 3.02 | |
| 48.3 | 2.0 | 44.3 | 1½ in. | 2.32 |
| 48.3 | 2.6 | 43.1 | 1½ in. | 2.98 |
| 48.3 | 3.25 | 41.8 | 1½ in. | 3.67 |
| 50.0 | 5.0 | 40.0 | 5.61 | |
| 51.0 | 2.6 | 45.8 | 3.15 | |
| 54.0 | 2.0 | 50.0 | 2.60 | |
| 57.0 | 2.9 | 51.2 | 3.93 | |
| 60.3 | 2.0 | 56.3 | 2 in. | 2.92 |
| 60.3 | 2.6 | 55.1 | 2 in. | 3.76 |
| 60.3 | 2.9 | 54.5 | 2 in. | 4.17 |
| 60.3 | 3.65 | 53.0 | 2 in. | 5.18 |
| 63.5 | 2.6 | 58.3 | 3.97 | |
| 70.0 | 2.9 | 64.2 | 4.87 | |
| 76.1 | 2.0 | 72.1 | 3.71 | |
| 76.1 | 2.9 | 70.3 | 5.32 | |
| 88.9 | 3.6 | 81.7 | 3 in. | 7.69 |
| 88.9 | 4.05 | 80.8 | 3 in. | 8.61 |
| 101.6 | 3.6 | 94.4 | 8.83 | |
| 108.0 | 4.0 | 100.0 | 10.42 | |
| 114.3 | 3.6 | 107.1 | 4 in. | 9.95 |
| 114.3 | 4.5 | 105.3 | 4 in. | 12.37 |
| 121.0 | 4.0 | 113.0 | 11.72 | |
| 133.0 | 4.0 | 125.0 | 12.92 | |
| 159.0 | 4.5 | 150.0 | 17.41 |
Chemical Composition of UNS S32750 / S32760 Alloy 2507 Tubes
| UNS S32750 / S32760 | C | N | P | Si | Mn | Mo | Ni | Cr | S | Cu |
| 00.030 | 00.24/00.32 | 00.035 | 00.80 | 1.20 | 3.0/5.0 | 6.00/8.00 | 24.0/26.0 | 00.020 | 00.50 |
SDSS 2507 S32750 / S32760 Tubing Mechanical & Physical Properties
| UNS S32750 / S32760 | Density | Melting Range | Yield Stress (0.2%Offset) | Tensile Stress | Elongation |
| 7.8 g/cm3 | 2460 °F, 1350 °C | 550MPa, 80000Psi | 800MPa, 116000Psi | 15 % |
2507 S32750 / S32760 Seamless/ Welded Tubes Equivalent Standard
| SS 2507 | ASTM/ ASME | WNR/ EN |
| UNS S32750 | ASTM A789 / ASME SA 789 | 1.4410 |
| UNS S32760 | ASTM A789 / ASME SA 789 | 1.4410 |