Super Duplex Stainless Steel Tube

Super duplex stainless steel tubes are highly durable and resistant to corrosion, making them an ideal choice for use in harsh environments. At Omsteel, we offer a wide range of super duplex stainless steel tubes that are designed to meet the unique needs of our clients.

Super duplex stainless steel tubes are made up of a combination of austenitic and ferritic stainless steel, which provides them with exceptional strength and resistance to corrosion. These tubes have higher chromium, molybdenum, and nitrogen content than standard duplex stainless steel tubes, which provides them with superior corrosion resistance and higher strength.

At Omsteel, we offer various grades of super duplex stainless steel tubes, including S32750, S32760, S32550, and others. These grades have different properties and are used in various applications based on their strength, corrosion resistance, and other factors. For instance, S32750 is a high-strength grade that is commonly used in oil and gas industry applications, while S32760 is a super duplex grade with excellent corrosion resistance that is often used in marine and chemical processing industries.

Super duplex stainless steel tubes also offer excellent heat resistance, making them suitable for high-temperature applications. They are highly versatile and can be used in various industrial applications, including oil and gas, chemical processing, and desalination.Omsteel is a trusted manufacturer of high-quality super duplex stainless steel tubes that offer exceptional features such as high strength, superior corrosion resistance, and heat resistance.

Types of Super Duplex Stainless Steel Tubes

There are two main types of super duplex stainless steel tubes: welded and seamless. Welded tubes are made by welding two pieces of metal together, while seamless tubes are made from a single piece of metal that is heated and then rolled into shape.

Welded super duplex stainless steel tubes are more cost-effective than seamless ones because they require less material to produce. However, they have a lower tolerance for pressure and temperature changes than seamless tubes. Seamless super duplex stainless steel tubes have a higher tolerance for pressure and temperature changes but are more expensive to produce.

Standard Super Duplex Tubes

Standard super duplex tubes are made from a combination of 22% chromium, 5-6% nickel, 3% molybdenum, and trace amounts of nitrogen. This composition gives these tubes excellent resistance to pitting and crevice corrosion in chloride-containing environments.

These tubes also have high mechanical strength and good ductility, making them suitable for use in high-pressure applications such as offshore drilling platforms and chemical processing plants.

Super Duplex Lean Grade Tubes

Super duplex lean grade tubes have a lower alloy content than standard super duplex tubes. They typically contain 21-23% chromium, 1.5-2.5% nickel, 0.3-0.6% molybdenum, and trace amounts of nitrogen.

Despite their lower alloy content, these tubes still offer good corrosion resistance in chloride-containing environments. They are also more cost-effective than standard super duplex tubes while still providing good mechanical strength.

Super Duplex Hyper Grade Tubes

Super duplex hyper grade tubes are designed for use in highly corrosive environments such as seawater or acidic solutions. They typically contain higher levels of chromium (25-26%), nickel (7%), molybdenum (4%), and nitrogen (0.3%).

These tubes offer superior corrosion resistance compared to standard super duplex or lean grade tubes. They are also highly resistant to stress corrosion cracking and erosion-corrosion, making them ideal for use in offshore oil rigs, desalination plants, and chemical processing facilities.

Super Duplex Super Hyper Tubes

Super duplex super hyper tubes are the most advanced type of super duplex tubing available today. These tubes have a unique composition that includes 25-26% chromium, 7-8% nickel, 4% molybdenum, and 0.3% nitrogen.

In addition to their exceptional corrosion resistance properties, these tubes also offer superior mechanical strength and fatigue resistance. They are designed for use in extreme environments where other types of tubing would fail.

SAF 2507 Super Duplex Tube

SAF 2507 is a super duplex tube that contains 25% chromium, 4% molybdenum, and 7% nickel. This alloy has excellent resistance to pitting and crevice corrosion in chloride-containing environments. The yield strength of SAF 2507 is around twice that of standard austenitic stainless steels.

Zeron 100 Super Duplex Tube

Zeron 100 is a super duplex tube that contains 25% chromium, 7% nickel, and 3.5% molybdenum with additions of copper and tungsten. This alloy has excellent resistance to localized corrosion such as pitting and crevice corrosion in aggressive environments containing chlorides or hydrogen sulfide.

Ferrinox®️255 SD50 Super Duplex Tube

Ferrinox®️255 SD50 is a super duplex tube that contains high levels of chromium (25%), molybdenum (6%), nitrogen (0.3%), and copper (1%). This alloy offers superior resistance to both uniform and localized corrosion in harsh environments.

LDX2101 Super Duplex Tube

LDX2101 is a lean duplex tube that contains low levels of nickel (less than 5%) but high levels of chromium (21-22%) and molybdenum (0.3-0.35%). This alloy offers good strength, excellent formability, and weldability while providing superior resistance to stress corrosion cracking.

Standards of Super Duplex Stainless Steel Tubes

The most common standards used for super duplex stainless steel tubes include ASTM A789, ASTM A790, and EN 10216-5.

ASTM A789 is the standard specification for welded ferritic/austenitic stainless steel tubing for general service. It covers grades such as UNS S31803 (Duplex 2205) and UNS S32750 (Super Duplex 2507). This standard specifies the requirements for straight-seam or spiral-seam welded tubing with wall thicknesses up to 0.75 inches inclusive.

ASTM A790 is the standard specification for seamless and welded ferritic/austenitic stainless steel pipe. It covers grades such as UNS S31803 (Duplex 2205) and UNS S32750 (Super Duplex 2507). This standard specifies the requirements for straight-seam or spiral-seam welded tubing with wall thicknesses up to 0.75 inches inclusive.

EN 10216-5 is the European standard for seamless steel tubes for pressure purposes. It covers grades such as X2CrNiMoN22-5-3 (1.4462) and X2CrNiMoCuWN25-7-4 (1.4501). This standard specifies the requirements for non-alloy and alloy steel tubes with specified low temperature properties.

Tolerances for Super Duplex UNS S Tube

Super duplex stainless steel tubes are widely used in various industries, including chemical processing, oil and gas, and marine engineering. These tubes are known for their exceptional strength, corrosion resistance, and durability. However, to ensure the quality of these tubes, manufacturers must adhere to strict standards and tolerances.

ASTM A789 UNS S32750 and ASTM A790 UNS S32750 are two of the most commonly used specifications for super duplex stainless steel tubes. These standards provide guidelines on the chemical composition, mechanical properties, heat treatment, manufacturing processes, and testing procedures for these tubes.

UNS S32750 is a grade of super duplex stainless steel that contains 25% chromium, 7% nickel, 3.6% molybdenum, and other elements such as nitrogen and tungsten. It has a high resistance to pitting corrosion, crevice corrosion, stress corrosion cracking (SCC), and general corrosion in chloride environments.

UNS S32760 is another grade of super duplex stainless steel that has a higher content of chromium (27%), molybdenum (4%), and nitrogen (0.3%) than UNS S32750. It offers even greater resistance to corrosion in harsh environments such as seawater.

Super duplex stainless steel tubes specifications

Standard Specification of UNS S32750 Super Duplex TubingASME, EN, ASTM, JIS, NF, AMS, AISI, DIN, DS, GB, SAE, DTD, TOCT
2507 Super Duplex Tube Standard Tolerances=+/- 0.030; tolerance may vary depending on grade and thickness
UNS S32750 Super Duplex Seamless Tube Size"15 NB to 150 NB IN 1/2"" OD - 12"" OD"
2507 Super Duplex Welded Tube Size"1/2"" OD - 12"" OD Guage: 25 SWG - 10 SWG"
UNS S32760 Super Duplex Saf 2507 Tube LengthUpto 30 meters, Single Random, Double Random & Required Length End: Plain End, Beveled End, Treaded, or Custom Cut Lengths
UNS S32750 Duplex Alloy 2507 Tube WT0.40 mm - 12.70 mm
UNS S32750 Super Duplex 2507 Tube Schedule5, 10S, 10, 30, 40S, 40, 80, 80S, XS, 160, XXH
Super Duplex SS UNS S32750 Tube Swg & Bwg10 Swg., 12 Swg., 14 Swg., 16 Swg., 18 Swg., 20 Swg.
ASTM A789 UNS S32760 Tubes manufacturing techniquesEFW, ERW, LSAW, Seam-Welded, CEW, DOM, Welded, Seamless, Redrawn, CDW, Fabricated

Range of UNS S32750 Duplex Alloy 2507 Tubes

ASME SA 789 UNS S32760 Square Tube2507 Super Duplex Stainless Steel Sanitary Tubing
UNS S32760 Super Duplex Saf 2507 Exhaust Tubing1 inch Super Duplex 2507 UNS S32760 Tubing
UNS S32750 Super Duplex Square TubingUNS S32750 Super Duplex 2507 Hollow Tubes
2507 Super Duplex Round TubesRe Drawn Super Duplex SS UNS S32750 Tubing
UNS S32750 Super Duplex Seamless TubeSuper Duplex SS UNS S32750 Coil Tubes
25cr Super Duplex Steel High Pressure TubesASTM A789 UNS S32750 Elliptical and Oval Tubes
ASTM A789 UNS S32750 Round Tubing2507 Super Duplex Finned Tubes
Super Duplex SS 2507 Rectangular TubingUNS S32750 Duplex Alloy 2507 Coiled Tubing
UNS S32750 Super Duplex 2507 ERW TubesHigh Pressure ASTM A789 UNS S32760 Tube
Super Duplex SS UNS S32750 Capillary TubingUNS S32760 Duplex Steel 2507 Heat exchanger Tube
UNS S32750 Duplex Alloy 2507 Hydraulic TubingASME SA 789 UNS S32760 Condenser Tubing
ASTM A789 UNS S32760 Welded TubeThin Wall UNS S32760 Super Duplex Saf 2507 Tubing
12mm Super Duplex UNS S32750 TubingSuper Duplex SS 2507 Polish Tubing
Super Duplex 2507 UNS S32760 Small Diameter Tubing25cr Super Duplex Steel Tube Bends

ASME SA 789 UNS S32760 Square Tube sizes and weights

DIMENSIONSWALLWEIGHT PERDIMENSIONSWALLWEIGHT PER
(MM)(MM)METRE (KG)(MM)(MM)METRE (KG)
12.7 x 12.71.20.4440 x401.21.49
12.7 x 12.71.50.5540 x401.51.85
15 x 151.20.5340 x4022.45
15 x 151.50.6540 x4033.75
20 x 201.20.7150 x501.52.32
20 x 201.50.8850 x5023.08
20 x 2021.1950 x5034.65
25 x 251.20.9260 x6023.71
25 x 251.51.1460 x6035.49
25 x 2521.4970 x7036.53
25 x 2532.280 x8024.98
30 x 301.21.180 x8037.53
30 x 301.51.37100 x 10026.4
30 x 3021.84100 x 10039.53
30 x 3032.72---

UNS S32760 Super Duplex Saf 2507 Capillary Tube Size Chart

Dimension thickness
0.025"4"0.75"
0.032"3.5"0.875"
0.036"0.109"1"
0.04"0.125"1.125"
0.05"0.16"1.25"
0.063"0.19"1.5"
0.071"0.25"1.75"
0.08"0.3125"2"
0.09"0.375"2.5"
0.095"0.5"3"
0.1"0.625"-

Super Duplex Tubing Gauge Thickness

GaugeThickness (INCH)Value (INCH)
220.025 - 0.0290.028
200.031 - 0.0350.035
190.038 - 0.0420.042
180.044 - 0.0490.049
170.053 - 0.0580.058
160.060 - 0.0650.065
150.066 - 0.0740.072
140.075 - 0.0850.083
130.087 - 0.0970.095
120.101 - 0.1110.109
110.112 - 0.1220.12
100.126 - 0.1360.134
90.140 - 0.1500.148
80.157 - 0.1670.165
70.175 - 0.1850.18

Super Duplex Stainless Steel Welded Tube Tolerances

O.D. InchesWall Thickness InchesO.D. +/- Inches
1/2" to 1" incl..025 to .0650.005
-Over .065 to .1340.01
1 to 1-1/2" incl..025 to .0650.008
-Over .065 to .1340.01
1-1/2" to 2" incl..025 to .0490.01
-Over .049 to .0830.011
-Over .083 to .1480.012
2" to 2-1/2" incl..032 to .0650.012
-Over .065 to .1090.013
-Over .109 to .1650.014
2-1/2" to 3-1/2" incl..032 to .1650.014
-Over .165 to .2200.02
3-1/2" to 5" incl..083 to .1650.02
-Over .165 to .2200.025

Super Duplex Steel Seamless Tube Chemical Structure

GradeSuper Duplex 2507
Carbon (C) Max.0.03
Manganese (Mn) Max.1.2
Phosphorous (P) Max.0.035
Sulphur (S) Max.0.02
Silicon (Si) Max.0.8
Chromium (Cr)24.0–26.0
Nickel (Ni)6.0–8.0
Molybdenum (Mo)3.0–5.0
Nitrogen (N)0.24–0.32
Iron (Fe)Bal.
Copper (Cu)0.5
Other Elements-

ASME SA 789 UNS S32750 Tube Mechanical Properties

"Tensile Strength""Yield Strength"
ALLOYUNS DESIGNATIONSPEC.PSIMPAKSIPSIMPAKSIELONGATION IN 2 IN. (MIN.) %GRAIN SIZE REQ.MAX. HARDNESSMODULUS OF ELASTICITY (X106PSI)MEAN COEFFICIENT OF THERMAL EXPANSION (IN./IN./°F X 10-6)THERMAL CONDUCTIVITY (BTU-IN/ FT2-H-°F)
2507S32950A789, A790100,00069010070,0004857020-30.5 Rc---
2507S32750A789, A790116,00080011680,0005508015-32 Rc27.57.298

Super Duplex UNS S32750 Tube Equivalent Standard

AlloyUNS DesignationSpecificationsAFNORGrade1.441
2507S32750A/SA789, A/SA790Z3 CN 25.06 AzF53X2 Cr Ni MoN 25.7.4

ASTM A789 UNS S32750 Tube Standard Tolerances

Size RangeStandard Tolerance
FormODWallLengthsGragesODWallLengths
"Pressure & Corrosion Tubing Meets or exceeds requirements for welded Specification: ASTM-A789""1/16"" (1.59 mm) - 4"" (101.6 mm) Metric sizes also available"0.010" (0.25 mm) - 0.220" (5.59 mm)"Random or cut lengths up - 40' (12.2 m) Coils to 1-1/2"" OD"Super Duplex 2507"<1-1/2"" (38.1 mm) ±0.005"" (0.13 mm) 1-1/2"" (38.1 mm) to 3"" (76.2 mm) ±0.010"" (0.25 mm) 3-1/2"" (88.9 mm) to 4"" (101.6 mm) ±0.015"" (0.38 mm)"±10%"Randoms up to +2"" (50.8 mm) Cuts +1/8"" (3 mm) -0"" Coils to 80,000' (24,384 m)"
"Subsea Umbilical Tubing Specifications: ASTM-A789 and ASTM-A790"3/8" (9.53 mm) to 1-1/2" (38.1 mm)0.039" (0.99 mm) to 0.125" (3.18 mm)"Cut lengths to 60' (18.3 m) Coils to 1-1/2"" OD*"Super Duplex 2507±0.005" (0.127 mm)±10%Coils to 80,000' (24,384 m)

Industrial Application of Super Duplex Stainless Tubes

Defence & Aerospace

Defence & Aerospace

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Oil/Gas

Oil/Gas

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Speciality Valves & Vacuum

Speciality Valves & Vacuum

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Precision Components

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FAQ

What are super duplex stainless steel tubes used for?

Super duplex stainless steel tubes are used in a wide range of applications, including oil and gas exploration and production, chemical processing, marine engineering, and other high-corrosion environments. They are often used in applications that require high strength, durability, and resistance to corrosion.

What are the benefits of using super duplex stainless steel tubes?

Super duplex stainless steel tubes offer several benefits over other types of tubes, including their high strength, durability, and resistance to corrosion. They are also highly customizable, allowing for specific application requirements to be met. Know more

What are some popular grades of super duplex stainless steel used for tubes?

There are several grades of super duplex stainless steel used for tubes, including UNS S32750 and UNS S32760. These grades offer excellent resistance to corrosion and high strength. Know more

What is the manufacturing process for super duplex stainless steel tubes?

Super duplex stainless steel tubes are typically manufactured using a process called hot forming, which involves heating the material and then forming it into the desired shape using a hydraulic press or other forming equipment. The manufacturing process can also involve additional heat treatments or surface finishing processes to further enhance the properties of the super duplex stainless steel.