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Super Duplex Tubes Manufacturer & Supplier
Kalpataru Piping Solution is a reputable producer and distributor of the Super Duplex Tubes used in high-efficiency environments where strength and resistance to corrosion are of great importance. The manufacturing of our super duplex stainless steel tubes has been done through fine manufacturing techniques in order to have better mechanical properties, a long service life, and good dimensional accuracy in all batches.
Such tubes are usually produced with grades like super duplex steel UNS S32750 tubes and UNS S41008, which are very resistant to pitting and crevice corrosion, as well as stress corrosion fracture. The material that meets the requirements of ASTM A790 UNS S32750 is particularly effective in the chloride-contaminated and high-pressure conditions because of its excellent structural stability and its resilience. Super duplex stainless tubing has both high tensile and yield strength, enabling it to offer reduced wall thickness whilst still being able to depend on good performance, and as such is a cost-effective choice to eliminate expensive combinations in demanding industrial systems.
Kalpataru Piping Solution provides duplex pipes and tubes with corrosion-resistant properties in various sizes, wall thicknesses, and surface finishes and compliant with international standards like ASTM A790. All products are strictly controlled in terms of quality assurance to ascertain specific dimensions, authentic chemical make-up and reliable mechanical operation needed to execute critical functions.
Our high-strength stainless tubing is extensively applied in oil and gas activity, offshore platforms, chemical processing facilities, desalination systems, and heat exchangers, as well as in marine engineering systems. Kalpataru Piping Solution has good expertise in Super Duplex UNS S32750, UNS S41008, and ASTM-compliant solutions for piping products, hence providing high-integrity piping products that are of high quality and standards in their operations and environmental conditions.
Super Duplex Tube material Grade
What is a Super Duplex Tube?
Super Duplex Tube material has a combination of the finest traits of both ferritic and austenitic stainless steels. The ferritic phase offers excellent mechanical strength, whereas the austenitic phase offers excellent resistance to corrosion; thus, these tubes are appropriate to work in the strenuous conditions of service.The Super Duplex Tubing is also very resistant to stress corrosion cracks, as well as having good impact toughness even when exposed to varying temperatures. Grade 2507 tubing has got a greater amount of chromium, and this greatly improves pitting and crevice corrosion resistance in chloride-contaminated settings.
This enables it to be a sure bet when it comes to applications that are exposed to seawater, chemicals, and high pressure. These are tubes that are produced in a large variety in terms of size, wall thickness and custom specification, and standard requirements can be customised to suit a particular project. Besides the performance advantages, super duplex tubes offer a long shelf life and cost-effectiveness relative to the normal stainless steel grades.
Specification of Super Duplex Tube
Super Duplex Tubes are available in seamless, welded, and ERW types with excellent strength and corrosion resistance for demanding environments.
Category | Parameter | Specification |
Alloy 2507 Seamless Tube Sizes | OD | 0.375″ to 1″ |
Thickness | 0.035″ to 0.065″ | |
Length | Up to 12 meters | |
SAF 2507 Welded Tube Sizes | OD | 0.125″ to 1″ |
Thickness | 0.035″ to 0.109″ | |
Length | Up to 26 meters | |
WNR 1.4410 Coil Tube Sizes | OD | 0.4 to 16 mm |
Thickness | 0.1 to 3 mm | |
Length | 50 to 1000 mm | |
SAF 2507 Capillary Tube Sizes | OD | 0.4 to 16 mm |
Thickness | 0.1 to 3 mm | |
Length | 0.5 to 12 meters | |
Super Duplex Tubing Properties | Melting Point | 1410–1460°C |
Density | 7.8 g/cm³ | |
Temperature Range | -50°C to 300°C | |
End Finish | Grooved, Bevelled, Plain, Threaded | |
Origin | Indian, European, Japanese | |
SDSS Square Tubing Testing | Testing Methods | Flaring, Reverse Flattening, Flange, Hardness, Tension, 100% PMI |
Tuberia Super Duplex Standards | ASTM / ASME | ASTM A789 / ASME SA 789 |
UNS Grades | S32750 / S32760 | |
WNR | 1.4410 | |
Other | AFNOR Z3 CN 25.06 Az | |
WNR 1.4410 Manufacturing Process | Process | Cold Finished, Hot Finished |
Super Duplex Boiler Tube European Standards | EN Standards | EN 10217-7, EN 10297-2, EN 10216-5, EN 10312, EN 10296-2 |
2507 Super Duplex Tubing Meet Standards | Standards | DIN 17458, EN 10216-5, EN 10216-2, EN 10088-3, DIN 17456, NSF 61, EN 10088-2, EN 10217-7, ASME B36.19M, ASME B36.19 |
Manufacturing Type | Tubing Types | Seamless, Welded, ERW (Straight), Annealed & Cold Redrawn |
Surface Finish | Heat Exchanger Finish | Passivated, Pre-cleaned, Cleaned, Pickled |
Applications of 2507 Tubing | Usage | Fluid & Gas Transport, Chloride Environments, Sea Water |
Value Added Services | Services | Cutting, Beveling, Threading, Polishing |
Types of Super Duplex Tubing
Super Duplex Stainless Steel Tube Pressure Rating
Super Duplex Tubes are designed to withstand high pressure across different schedules, sizes, and temperature ranges, ensuring reliable performance in critical environments.
Tube Schedule | Tube Size | 200°F | 100°F | 300°F | 500°F | 400°F | 650°F | 750°F | 600°F | 700°F |
80 | 1″ | 3634 | 4213 | 3265 | 2791 | 3002 | 2580 | 2501 | 2659 | 2528 |
40 | 1″ | 2629 | 3048 | 2362 | 2019 | 2171 | 1867 | 1810 | 1924 | 1824 |
160 | 1″ | 5296 | 6140 | 4759 | 4068 | 4375 | 3761 | 3646 | 3876 | 3684 |
80 | 1.5″ | 2744 | 3182 | 2466 | 2108 | 2267 | 1949 | 1889 | 2009 | 1909 |
40 | 1.5″ | 1947 | 2257 | 1750 | 1496 | 1608 | 1383 | 1340 | 1425 | 1354 |
160 | 1.5″ | 3984 | 4619 | 3580 | 3060 | 3291 | 2829 | 2743 | 2916 | 2772 |
80 | 2″ | 2369 | 2747 | 2129 | 1820 | 1957 | 1682 | 1631 | 1734 | 1648 |
40 | 2″ | 1640 | 1902 | 1474 | 1260 | 1355 | 1165 | 1129 | 1201 | 1141 |
160 | 2″ | 3880 | 4499 | 3486 | 2980 | 3205 | 2755 | 2671 | 2840 | 2699 |
80 | 3″ | 2202 | 2553 | 1979 | 1691 | 1819 | 1564 | 1516 | 1612 | 1532 |
40 | 3″ | 1558 | 1806 | 1400 | 1196 | 1287 | 1106 | 1072 | 1140 | 1084 |
160 | 3″ | 3312 | 3840 | 2976 | 2544 | 2736 | 2352 | 2280 | 2424 | 2304 |
80 | 4″ | 1909 | 2213 | 1715 | 1466 | 1577 | 1355 | 1314 | 1397 | 1328 |
40 | 4″ | 1321 | 1531 | 1187 | 1014 | 1091 | 938 | 909 | 967 | 919 |
160 | 4″ | 3106 | 3601 | 2791 | 2386 | 2566 | 2206 | 2138 | 2273 | 2161 |
80 | 5″ | 1709 | 1981 | 1535 | 1312 | 1411 | 1213 | 1176 | 1250 | 1189 |
40 | 5″ | 1158 | 1342 | 1040 | 889 | 956 | 822 | 797 | 847 | 805 |
160 | 5″ | 2945 | 3414 | 2646 | 2262 | 2433 | 2091 | 2027 | 2155 | 2049 |
80 | 6″ | 1650 | 1913 | 1483 | 1267 | 1363 | 1172 | 1136 | 1208 | 1148 |
40 | 6″ | 1052 | 1219 | 945 | 808 | 869 | 747 | 724 | 770 | 732 |
160 | 6″ | 2836 | 3289 | 2549 | 2179 | 2343 | 2014 | 1953 | 2076 | 1973 |
80 | 8″ | 1459 | 1692 | 1311 | 1121 | 1205 | 1036 | 1005 | 1068 | 1015 |
40 | 8″ | 926 | 1073 | 832 | 711 | 765 | 657 | 637 | 678 | 644 |
160 | 8″ | 2738 | 3175 | 2460 | 2103 | 2262 | 1944 | 1885 | 2004 | 1905 |
80 | 10″ | 1388 | 1609 | 1247 | 1066 | 1147 | 986 | 956 | 1016 | 966 |
40 | 10″ | 840 | 974 | 755 | 645 | 694 | 596 | 578 | 615 | 584 |
160 | 10″ | 2714 | 3147 | 2439 | 2085 | 2242 | 1927 | 1868 | 1986 | 1880 |
Super Duplex Pipe vs Super Duplex Tube
Super Duplex Pipes are used for large-scale fluid transfer and structural applications, while Super Duplex Tubes are designed for precision systems such as hydraulics and heat exchangers requiring tighter tolerances.
Feature | Super Duplex Pipe | Super Duplex Tube |
Shape | Larger diameter | Smaller diameter |
Applications | Fluid transportation & structural use | Hydraulic systems, heat exchangers |
Wall Thickness | Thicker walls | Thinner walls |
Standards | Piping standards | Tubing standards |
Cost | Higher | Lower |
Mechanical Properties | Enhanced yield strength | Good strength, application-specific |
Grades of SDSS Tube
Grade | Approximate Composition |
S32750 (F53) | 7% Ni, 25% Cr, 4% Mo |
S32760 (F55) | 9% Ni, 25% Cr, 4.5% Mo |
S32550 (F44) | 5% Ni, 23% Cr, 3% Mo |
S31803 (F51) | 5.5% Ni, 22% Cr, 3% Mo |
S32050 (F53) | 6% Ni, 25% Cr, 3.5% Mo |
Alloy 2507 Seamless Tube Physical Properties
Alloy 2507 tubes offer balanced density, strong modulus of elasticity, and efficient thermal conductivity, ensuring durability and stable performance in high-pressure and corrosive conditions.
Property | Value | Unit |
Density | 7.8 | g/cm³ |
Thermal Conductivity | 15 | W·m⁻¹·K⁻¹ |
Specific Heat (0–100°C) | 500 | J·kg⁻¹·K⁻¹ |
Modulus of Elasticity | 200 | GPa |
Thermal Expansion | 11 | μm/μm/°C |
Electrical Resistivity | 8.12 | Ohm·cm |
2507 Tubing Temperature Range (ASME B31.3)
2507 tubing performs reliably across a wide temperature range, maintaining strength and safety factors as specified by ASME standards for process and pressure applications.
| °C | °F | B31.3 Chapter IX Factor | B31.3 Base Code Factor |
| 66 | 150 | 0.92 | 1.00 |
| 93 | 200 | 0.88 | 0.99 |
| 121 | 250 | 0.84 | 0.96 |
| 149 | 300 | 0.81 | 0.94 |
| 204 | 400 | 0.76 | 0.91 |
| 260 | 500 | 0.73 | 0.89 |
WNR 1.4410 Heat Exchanger Tube Coating Standards
Coating / Lining Types |
Novolac Epoxy |
Curran 1000 T Hybrid Epoxy |
Thick Film Epoxy Cladding |
Phenol Epoxy |
Sakaphen (Shell & Tube Heat Exchanger Lining) |
Curralon® |
Curran 1000T |
Curran Coating – High Functionality Epoxy |
2507 Super Duplex Tubing Welding Materials
Welding Processes |
Submerged Arc Welding (SAW) |
Shielded Metal Arc Welding (SMAW / MMA) |
Flux-Cored Arc Welding (FCAW) |
Gas Metal Arc Welding (GMAW / MIG/MAG) |
Gas Tungsten Arc Welding (TIG / GTAW) |
Super Duplex Seamless Tube Wall Thickness
Nominal Size | OD (Inches) | 40 | 80 | 80S/E.H | 10S | 10 | 40S/STD | 160 |
1/2 | 0.840 | .109 | .147 | .147 | .083 | .083 | .109 | .187 |
3/4 | 1.050 | .113 | .154 | .154 | .083 | .083 | .113 | .218 |
1 | 1.315 | .133 | .179 | .179 | .109 | .109 | .133 | .250 |
1 1/2 | 1.900 | .145 | .200 | .200 | .109 | .109 | .145 | .281 |
2 | 2.375 | .154 | .218 | .218 | .109 | .109 | .154 | .343 |
3 | 3.500 | .216 | .300 | .300 | .120 | .120 | .216 | .437 |
4 | 4.500 | .237 | .337 | .337 | .120 | .120 | .237 | .531 |
5 | 5.563 | .258 | .375 | .375 | .134 | .134 | .258 | .625 |
6 | 6.625 | .280 | .432 | .432 | .134 | .134 | .280 | .718 |
8 | 8.625 | .322 | .500 | .500 | .148 | .148 | .322 | .906 |
10 | 10.750 | .365 | .593 | .500 | .165 | .165 | .365 | 1.125 |
12 | 12.750 | .406 | .687 | .500 | .180 | .180 | .375 | 1.312 |
14 | 14.000 | .437 | .750 | .500 | .188 | .250 | .375 | 1.406 |
16 | 16.000 | .500 | .843 | .500 | .188 | .250 | .375 | 1.593 |
18 | 18.000 | .562 | .937 | .500 | .188 | .250 | .375 | 1.781 |
SAF 2507 Coil Tube Gauge Thickness
Gauge | Typical Value (Inch) | Thickness Range (Inch) |
20 | 0.035 | 0.031 – 0.035 |
18 | 0.049 | 0.044 – 0.049 |
16 | 0.065 | 0.060 – 0.065 |
14 | 0.083 | 0.075 – 0.085 |
12 | 0.109 | 0.101 – 0.111 |
10 | 0.134 | 0.126 – 0.136 |
8 | 0.165 | 0.157 – 0.167 |
7 | 0.180 | 0.175 – 0.185 |
Super Duplex 2507 Tube Equivalent
Super Duplex 2507 tubes correspond to international standards such as UNS S32750, EN X2CrNiMoN25.7.4, and ASTM A/SA789, ensuring worldwide material compatibility and specification alignment.
Region | Standard / Designation |
Werkstoff No. | 1.4410 |
ASTM/ASME | A/SA789, A/SA790 |
AFNOR | Z3 CN 25.06 Az |
Grade | F53 |
UNS | S32750 |
EN | X2 Cr Ni MoN 25.7.4 |
Mechanical Properties of Super Duplex Stainless Steel Tubes
These Super Duplex tubes provide high yield and tensile strength with good elongation and controlled hardness, offering excellent durability in high-pressure and corrosive environments.
Alloy | UNS | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation % | Max Hardness |
2507 | S32750 | 550 MPa | 800 MPa | 15% | 32 Rc |
2507 | S32950 | 485 MPa | 690 MPa | 20% | 30.5 Rc |
Duplex 2507 Tube Sizes
Available in a wide range of outer diameters, wall thicknesses, and schedules, Duplex 2507 tubes meet diverse piping and tubing requirements across industrial systems.
OD (mm) | WT (mm) | Schedule | Kg/m | Inch |
13.072 | 1.065 | 10S | 0.050 | 1/4 |
13.072 | 2.024 | 40S | 0.064 | 1/4 |
13.072 | 3.002 | 80S | 0.081 | 1/4 |
17.015 | 1.065 | 10S | 0.064 | 3/8 |
17.015 | 2.031 | 40S | 0.086 | 3/8 |
17.015 | 3.020 | 80S | 1.012 | 3/8 |
21.034 | 2.011 | 10S | 1.002 | 1/2 |
21.034 | 2.077 | 40S | 1.029 | 1/2 |
21.034 | 3.073 | 80S | 1.065 | 1/2 |
26.067 | 2.011 | 10S | 1.030 | 3/4 |
26.067 | 2.087 | 40S | 1.071 | 3/4 |
26.067 | 3.091 | 80S | 2.023 | 3/4 |
33.040 | 2.077 | 10S | 2.013 | 1 |
33.040 | 3.038 | 40S | 2.054 | 1 |
33.040 | 4.055 | 80S | 3.029 | 1 |
33.040 | 6.0352 | 160 | 4.030 | 1 |
42.016 | 2.077 | 10S | 2.073 | 1¼ |
42.016 | 3.056 | 40S | 3.044 | 1¼ |
42.016 | 4.085 | 80S | 4.053 | 1¼ |
42.016 | 6.0352 | 160 | 5.069 | 1¼ |
48.026 | 2.077 | 10S | 3.016 | 1½ |
48.026 | 3.068 | 40S | 4.011 | 1½ |
48.026 | 5.008 | 80S | 5.049 | 1½ |
60.033 | 2.077 | 10S | 3.099 | 2 |
60.033 | 3.091 | 40S | 5.052 | 2 |
60.033 | 5.054 | 80S | 7.060 | 2 |
60.033 | 8.0742 | 160 | 11.029 | 2 |
73.003 | 3.005 | 10S | 5.035 | 2½ |
73.003 | 5.016 | 40S | 8.077 | 2½ |
73.003 | 7.001 | 80S | 11.059 | 2½ |
88.090 | 3.005 | 10S | 6.056 | 3 |
88.090 | 5.049 | 40S | 11.047 | 3 |
88.090 | 7.062 | 80S | 15.051 | 3 |
88.090 | 11.0132 | 160 | 21.067 | 3 |
101.060 | 3.005 | 10S | 7.053 | 3½ |
101.060 | 5.074 | 40S | 13.078 | 3½ |
101.060 | 8.008 | 80S | 18.092 | 3½ |
114.030 | 3.005 | 10S | 8.050 | 4 |
114.030 | 6.002 | 40S | 16.032 | 4 |
114.030 | 8.056 | 80S | 22.067 | 4 |
114.030 | 13.0492 | 160 | 34.005 | 4 |
141.030 | 6.055 | 40S | 22.010 | 5 |
141.030 | 9.053 | 80S | 31.044 | 5 |
141.030 | 15.0882 | 160 | 49.087 | 5 |
168.028 | 3.040 | 10S | 14.004 | 6 |
168.028 | 7.011 | 40S | 28.069 | 6 |
168.028 | 10.097 | 80S | 43.021 | 6 |
168.028 | 14.027 | 120 | 54.075 | 6 |
168.028 | 18.0262 | 160 | 68.059 | 6 |
219.008 | 8.018 | 40S | 43.020 | 8 |
219.008 | 12.070 | 80S | 65.063 | 8 |
219.008 | 18.023 | 120 | 91.030 | 8 |
219.008 | 23.0012 | 160 | 112.097 | 8 |
Super Duplex Tube Dimensions
Manufactured with precise dimensional tolerances and varied thickness options, these tubes ensure reliable performance for structural, process, and heat exchanger applications.
Outer Diameter (OD) | Range of Wall Thicknesses | Wall Thickness (WT) |
6.35 mm | 0.30 mm | 0.25 mm |
12.7 mm | 0.75 mm | 0.3 mm |
19 mm | 1.0 mm | 0.5 mm |
25.4 mm | 1.5 mm | 0.5 mm |
38.1 mm | 2.0 mm | 1 mm |
50.8 mm | 3.0 mm | 1.5 mm |
63.5 mm | 4.0 mm | 2 mm |
76.2 mm | 5.0 mm | 4 mm |
101.6 mm | 6.0 mm | 5 mm |
127 mm | 7.0 mm | 6 mm |
152.4 mm | 8.0 mm | 7 mm |
Applications & Uses of Super Duplex Tubes
- Marine Applications
- Pulp & Paper Mill Equipment
- Desalination Equipment
- Oil and gas industry equipment
- Chemical Process Pressure Vessels
- Flue Gas Scrubbing Equipment
- Offshore Oil Production
Get in Touch
Looking for high-quality Super Duplex Steel Tubes for your industrial project? Contact Kalpataru Piping Solution today to get expert assistance, technical support, and a competitive quote tailored to your requirements.
Request a QuotePeople Ask About Nuts Manufacturer
Super duplex tubing is a high-performance stainless steel tubing made from a balanced mix of austenitic and ferritic microstructures. It offers exceptional strength, excellent resistance to corrosion, and superior performance in harsh environments such as seawater, chemical processing, and oil & gas applications. Super duplex tubing is widely used where high pressure, high temperature, and chloride exposure are involved, delivering longer service life compared to standard stainless steel tubing.
Stainless steel (SS) is primarily austenitic in structure and is known for good corrosion resistance and formability. Duplex stainless steel (DSS), on the other hand, contains a dual-phase structure of austenite and ferrite. This dual structure gives DSS higher mechanical strength, better resistance to stress corrosion cracking, and improved durability in aggressive environments compared to conventional stainless steel.
Duplex 2205 is a commonly used duplex stainless steel that provides good corrosion resistance and moderate strength for general industrial applications. Super duplex, however, contains higher levels of chromium, molybdenum, and nitrogen, which significantly enhance corrosion resistance and tensile strength. As a result, super duplex materials are preferred for extreme conditions such as offshore platforms, desalination plants, and high-chloride environments where duplex 2205 may not be sufficient.