Super Duplex Tubes Manufacturer & Supplier
Kalpaturu Piping Solution is a stable manufacturer and supplier of the Super Duplex Tubes, which are used in high-performance mode when the strength and resistance to corrosion are essential. The manufacturing of our Super Duplex Tubes is done in high manufacturing processes so that they have better mechanical properties, are long-lasting in service, and meet the same quality in all dimensions.
These Super Duplex Tubes are typically produced in grades like Super Duplex UNS S32750 and UNS S41008 that are better than others in resistance to pitting, crevice corrosion and stress corrosion cracking. Such materials as ASTM A790 UNS S32750 are particularly desirable to be used in the chloride-contaminated and high-pressure conditions because of their high durability and stability of the structure. Super Duplex Tubes are cost-effective in the demanding industries since their high tensile and yield strength enable them to be used with minimal wall thickness, yet they still perform well.
Kalpataru Piping Solution is a supplier of super duplex tubes of all kinds with different sizes, different wall thicknesses and different finishes that meet international requirements in such establishments as ASTM A790 UNS S32750. Rigid quality control is performed on every tube to guarantee its dimensional performance, control over chemical composition and mechanical stability.
Its super duplex tubes are popular in the oil and gas industry, offshore platforms, chemical processing, desalination plants, heat exchangers, and marine systems. Kalpaturu Piping Solution has the knowledge of Super Duplex UNS S32750, UNS S41008 and ASTM A790 UNS S32750 and provides reliable solutions in tubing systems to high operating standards.
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
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
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
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
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)
| °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
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
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
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
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
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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.
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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.