Super Duplex Steel Tubing
Super duplex stainless steel tubing is a high-performance alloy tube manufactured from a dual-phase ferritic-austenitic microstructure. It is produced in grades UNS S32750 and S32760, with chromium content of 25%, molybdenum up to 4%, and nitrogen up to 0.30%. The three key properties that define this material are its exceptional resistance to pitting and crevice corrosion, mechanical strength that is roughly double that of standard austenitic grades, and reliable performance at temperatures up to 300°C. Super duplex tubes serve the oil and gas, chemical processing, marine, and power generation industries, where aggressive media and high pressures are constant operating conditions.
Super Duplex Steel Tubing Prices
The price of super duplex stainless steel tubing depends on multiple variables. Understanding these factors helps in accurate project budgeting.
Approximate Price Range:
Super duplex steel tubing in India is priced between Rs. 900 and Rs. 1440 per kg for standard grades. The final rate is determined by grade, outside diameter, wall schedule, and order volume.
Factors Affecting Price:
- Grade and alloy content: UNS S32760 carries higher molybdenum and tungsten levels than S32750. This directly increases raw material cost.
- Wall thickness and schedule: Heavier schedules, such as Sch 80S and Sch 160S, consume more alloy per unit length. Cost per kg rises with wall thickness.
- Manufacturing method: Seamless super duplex tubes are costlier than welded variants due to lower production volumes and tighter tooling requirements.
- Market fluctuations: Molybdenum and nickel prices on commodity markets influence raw material costs. Confirm current LME pricing before placing bulk orders.
Super Duplex Steel Tubing Grades
Super duplex tubes are evaluated based on corrosion resistance, service temperature, and mechanical load. Below are the common grades listed:
- Super Duplex Steel Zeron 100 Tubing
- Super Duplex Steel S32760 Tubing
- Super Duplex Steel Ferralium 255 Tubing
- Super Duplex Steel 2507 Tubing
- Super Duplex Steel S32750 Tubing
Types Of Super Duplex Steel Tubing
Super duplex tubing is available in 4 main product forms, each suited to specific pressure ratings, service environments, and fabrication needs.
- Seamless super duplex steel tubing
- Welded/ERW super duplex steel tubing
- Heat exchanger/condenser super duplex steel tubing
- Hydraulic super duplex steel tubing
Super Duplex Steel Tubing Specifications
The table below covers governing standards, dimensional range, and available forms for super duplex steel tubing procurement and reference.
|
Specification |
Details |
|
Common Grades |
Hastelloy C276 (UNS N10276), C22 (N06022), B2 (N10665), X (N06020) |
|
Standards |
Seamless: ASTM B622, ASME SB622; Welded: ASTM B619 / B626, ASME SB619 / SB626 |
|
Size Range (Nominal) |
1/8" to 24" NB; OD 6.0 mm to 609.6 mm |
|
Wall Thickness |
Sch 5S, 10S, 40S, 80S, 160S, XXS; 0.5 mm to 25 mm |
|
Length |
Single Random (6–7 m), Double Random (12–14 m), or Custom lengths |
|
Forms |
Seamless, Welded (ERW/EFW), Fabricated (e.g., coils, U‑bends, bends, assemblies) |
Super Duplex Steel Tubing Size Chart
Super duplex steel tubing sizes range from NPS 1/8" through 4", covering OD values from 6.35 mm to 101.6 mm for standard industrial layouts.
|
NPS (inch) |
Nominal OD (inch) |
Nominal OD (mm) |
Typical Tubing Schedules / Wall (mm) |
|
1/8" |
0.250" |
6.35 mm |
0.75 – 1.0 mm (capillary / thin wall) |
|
1/4" |
0.250" (or 0.375") |
6.35 – 9.5 mm |
0.8 – 1.6 mm (capillary, coil tubing) |
|
3/8" |
0.375" |
9.5 mm |
0.8 – 2.0 mm |
|
1/2" |
0.500" |
12.7 mm |
1.0 – 2.5 mm |
|
3/4" |
0.750" |
19.05 mm |
1.2 – 2.8 mm |
|
1" |
1.000" |
25.4 mm |
1.5 – 3.0 mm |
|
1-1/4" |
1.250" |
31.8 mm |
1.8 – 3.5 mm |
|
1-1/2" |
1.500" |
38.1 mm |
2.0 – 4.0 mm |
|
2" |
2.000" |
50.8 mm |
2.5 – 5.0 mm |
|
2-1/2" |
2.500" |
63.5 mm |
3.0 – 6.0 mm |
|
3" |
3.000" |
76.2 mm |
3.5 – 6.5 mm |
|
4" |
4.000" |
101.6 mm |
4.5 – 8.0 mm |
Schedule Chart Of Super Duplex Steel Tubing
Wall thickness increases with schedule number. A higher schedule delivers a thicker wall and a higher pressure rating. Use this chart to confirm the correct wall specification for your operating pressure and temperature.
|
NPS (inch) |
Outside Diameter (in) |
Schedule 5S / 10S wall (in) |
Schedule 10 wall (in) |
Schedule 40 / STD wall (in) |
Schedule 80 / XS wall (in) |
|
¼" |
0.540 |
0.065 (≈1.65 mm) |
– |
0.083 (≈2.1 mm) |
0.134 (≈3.4 mm) |
|
3/8" |
0.675 |
0.065 (≈1.65 mm) |
– |
0.091 (≈2.3 mm) |
0.148 (≈3.75 mm) |
|
½" |
0.840 |
0.083 (≈2.1 mm) |
– |
0.109 (≈2.8 mm) |
0.188 (≈4.8 mm) |
|
¾" |
1.050 |
0.083 (≈2.1 mm) |
– |
0.113 (≈2.9 mm) |
0.188 (≈4.8 mm) |
|
1" |
1.315 |
0.109 (≈2.8 mm) |
0.133 (≈3.4 mm) |
0.179 (≈4.5 mm) |
0.250 (≈6.4 mm) |
|
1-1/4" |
1.660 |
0.109 (≈2.8 mm) |
0.140 (≈3.6 mm) |
0.191 (≈4.8 mm) |
0.250 (≈6.4 mm) |
|
1-1/2" |
1.900 |
0.109 (≈2.8 mm) |
0.145 (≈3.7 mm) |
0.200 (≈5.1 mm) |
0.281 (≈7.1 mm) |
|
2" |
2.375 |
0.109 (≈2.8 mm) |
– |
0.154 (≈3.9 mm) |
0.218 (≈5.5 mm) |
Key Features Of Super Duplex Steel Tubing
Super duplex steel tubing is specified for 8 service conditions where standard austenitic grades and carbon steel fail under load or corrosive exposure.
- Enhanced durability
- Improved fatigue resistance
- Cost efficiency
- Good weldability
- Thermal stability
- Reduced maintenance needs
- Versatile applications
- Sustainable performance
Applications Of Super Duplex Steel Tubing
Super duplex stainless steel tubing serves 6 major industries where corrosive media, elevated pressure, or saline environments rule out conventional piping materials.
- Oil and Gas Exploration
- Chemical processing
- Marine engineering
- Power generation
- Water treatment
- Pulp and paper industry
How To Choose The Right Super Duplex Steel Tubing Supplier And Manufacturer?
Choosing the right super duplex tube suppliers directly affects tubing integrity, project timelines, and total procurement cost. Evaluate these 4 areas before finalising a vendor.
Selecting the right supplier and manufacturer:
Confirm the manufacturer produces super duplex tubes in the exact grade and NPS required. Not every facility handles duplex alloys. Verify production capabilities for UNS S32750 and S32760 before issuing an RFQ.
Technical considerations:
Match the grade to the service environment, whether chloride exposure, acidic media, or elevated pressure. Request a material test certificate (MTC) confirming chemical composition and mechanical properties. Confirm compliance with ASTM A789 for seamless and ASTM A928 for welded tubing. Custom wall schedules carry 8–12 week lead times; check stock availability early.
Evaluating supplier credibility:
A reliable super duplex tube supplier holds ISO 9001 certification at a minimum. Every tube batch must carry a heat number traceable to the originating mill. This is mandatory for project documentation and quality audits.
Procurement strategy:
Send a clear RFQ that includes grade (UNS number), NPS, schedule, finish, governing standard, and quantity. Compare at least three supplier proposals based on pricing, lead time, MTC availability, and order quantities. For bulk orders, schedule a pre-dispatch inspection (PDI) or third-party inspection (TPI) at the manufacturer's site.
Super duplex stainless steel tubing is a high-performance alloy tube manufactured from a dual-phase ferritic-austenitic microstructure. It is produced in grades UNS S32750 and S32760, with chromium content of 25%, molybdenum up to 4%, and nitrogen up to 0.30%. The three key properties that define this material are its exceptional resistance to pitting and crevice corrosion, mechanical strength that is roughly double that of standard austenitic grades, and reliable performance at temperatures up to 300°C. Super duplex tubes serve the oil and gas, chemical processing, marine, and power generation industries, where aggressive media and high pressures are constant operating conditions.
Super Duplex Steel Tubing Prices
The price of super duplex stainless steel tubing depends on multiple variables. Understanding these factors helps in accurate project budgeting.
Approximate Price Range:
Super duplex steel tubing in India is priced between Rs. 900 and Rs. 1440 per kg for standard grades. The final rate is determined by grade, outside diameter, wall schedule, and order volume.
Factors Affecting Price:
- Grade and alloy content: UNS S32760 carries higher molybdenum and tungsten levels than S32750. This directly increases raw material cost.
- Wall thickness and schedule: Heavier schedules, such as Sch 80S and Sch 160S, consume more alloy per unit length. Cost per kg rises with wall thickness.
- Manufacturing method: Seamless super duplex tubes are costlier than welded variants due to lower production volumes and tighter tooling requirements.
- Market fluctuations: Molybdenum and nickel prices on commodity markets influence raw material costs. Confirm current LME pricing before placing bulk orders.
Super Duplex Steel Tubing Grades
Super duplex tubes are evaluated based on corrosion resistance, service temperature, and mechanical load. Below are the common grades listed:
- Super Duplex Steel Zeron 100 Tubing
- Super Duplex Steel S32760 Tubing
- Super Duplex Steel Ferralium 255 Tubing
- Super Duplex Steel 2507 Tubing
- Super Duplex Steel S32750 Tubing
Types Of Super Duplex Steel Tubing
Super duplex tubing is available in 4 main product forms, each suited to specific pressure ratings, service environments, and fabrication needs.
- Seamless super duplex steel tubing
- Welded/ERW super duplex steel tubing
- Heat exchanger/condenser super duplex steel tubing
- Hydraulic super duplex steel tubing
Super Duplex Steel Tubing Specifications
The table below covers governing standards, dimensional range, and available forms for super duplex steel tubing procurement and reference.
|
Specification |
Details |
|
Common Grades |
Hastelloy C276 (UNS N10276), C22 (N06022), B2 (N10665), X (N06020) |
|
Standards |
Seamless: ASTM B622, ASME SB622; Welded: ASTM B619 / B626, ASME SB619 / SB626 |
|
Size Range (Nominal) |
1/8" to 24" NB; OD 6.0 mm to 609.6 mm |
|
Wall Thickness |
Sch 5S, 10S, 40S, 80S, 160S, XXS; 0.5 mm to 25 mm |
|
Length |
Single Random (6–7 m), Double Random (12–14 m), or Custom lengths |
|
Forms |
Seamless, Welded (ERW/EFW), Fabricated (e.g., coils, U‑bends, bends, assemblies) |
Super Duplex Steel Tubing Size Chart
Super duplex steel tubing sizes range from NPS 1/8" through 4", covering OD values from 6.35 mm to 101.6 mm for standard industrial layouts.
|
NPS (inch) |
Nominal OD (inch) |
Nominal OD (mm) |
Typical Tubing Schedules / Wall (mm) |
|
1/8" |
0.250" |
6.35 mm |
0.75 – 1.0 mm (capillary / thin wall) |
|
1/4" |
0.250" (or 0.375") |
6.35 – 9.5 mm |
0.8 – 1.6 mm (capillary, coil tubing) |
|
3/8" |
0.375" |
9.5 mm |
0.8 – 2.0 mm |
|
1/2" |
0.500" |
12.7 mm |
1.0 – 2.5 mm |
|
3/4" |
0.750" |
19.05 mm |
1.2 – 2.8 mm |
|
1" |
1.000" |
25.4 mm |
1.5 – 3.0 mm |
|
1-1/4" |
1.250" |
31.8 mm |
1.8 – 3.5 mm |
|
1-1/2" |
1.500" |
38.1 mm |
2.0 – 4.0 mm |
|
2" |
2.000" |
50.8 mm |
2.5 – 5.0 mm |
|
2-1/2" |
2.500" |
63.5 mm |
3.0 – 6.0 mm |
|
3" |
3.000" |
76.2 mm |
3.5 – 6.5 mm |
|
4" |
4.000" |
101.6 mm |
4.5 – 8.0 mm |
Schedule Chart Of Super Duplex Steel Tubing
Wall thickness increases with schedule number. A higher schedule delivers a thicker wall and a higher pressure rating. Use this chart to confirm the correct wall specification for your operating pressure and temperature.
|
NPS (inch) |
Outside Diameter (in) |
Schedule 5S / 10S wall (in) |
Schedule 10 wall (in) |
Schedule 40 / STD wall (in) |
Schedule 80 / XS wall (in) |
|
¼" |
0.540 |
0.065 (≈1.65 mm) |
– |
0.083 (≈2.1 mm) |
0.134 (≈3.4 mm) |
|
3/8" |
0.675 |
0.065 (≈1.65 mm) |
– |
0.091 (≈2.3 mm) |
0.148 (≈3.75 mm) |
|
½" |
0.840 |
0.083 (≈2.1 mm) |
– |
0.109 (≈2.8 mm) |
0.188 (≈4.8 mm) |
|
¾" |
1.050 |
0.083 (≈2.1 mm) |
– |
0.113 (≈2.9 mm) |
0.188 (≈4.8 mm) |
|
1" |
1.315 |
0.109 (≈2.8 mm) |
0.133 (≈3.4 mm) |
0.179 (≈4.5 mm) |
0.250 (≈6.4 mm) |
|
1-1/4" |
1.660 |
0.109 (≈2.8 mm) |
0.140 (≈3.6 mm) |
0.191 (≈4.8 mm) |
0.250 (≈6.4 mm) |
|
1-1/2" |
1.900 |
0.109 (≈2.8 mm) |
0.145 (≈3.7 mm) |
0.200 (≈5.1 mm) |
0.281 (≈7.1 mm) |
|
2" |
2.375 |
0.109 (≈2.8 mm) |
– |
0.154 (≈3.9 mm) |
0.218 (≈5.5 mm) |
Key Features Of Super Duplex Steel Tubing
Super duplex steel tubing is specified for 8 service conditions where standard austenitic grades and carbon steel fail under load or corrosive exposure.
- Enhanced durability
- Improved fatigue resistance
- Cost efficiency
- Good weldability
- Thermal stability
- Reduced maintenance needs
- Versatile applications
- Sustainable performance
Applications Of Super Duplex Steel Tubing
Super duplex stainless steel tubing serves 6 major industries where corrosive media, elevated pressure, or saline environments rule out conventional piping materials.
- Oil and Gas Exploration
- Chemical processing
- Marine engineering
- Power generation
- Water treatment
- Pulp and paper industry
How To Choose The Right Super Duplex Steel Tubing Supplier And Manufacturer?
Choosing the right super duplex tube suppliers directly affects tubing integrity, project timelines, and total procurement cost. Evaluate these 4 areas before finalising a vendor.
Selecting the right supplier and manufacturer:
Confirm the manufacturer produces super duplex tubes in the exact grade and NPS required. Not every facility handles duplex alloys. Verify production capabilities for UNS S32750 and S32760 before issuing an RFQ.
Technical considerations:
Match the grade to the service environment, whether chloride exposure, acidic media, or elevated pressure. Request a material test certificate (MTC) confirming chemical composition and mechanical properties. Confirm compliance with ASTM A789 for seamless and ASTM A928 for welded tubing. Custom wall schedules carry 8–12 week lead times; check stock availability early.
Evaluating supplier credibility:
A reliable super duplex tube supplier holds ISO 9001 certification at a minimum. Every tube batch must carry a heat number traceable to the originating mill. This is mandatory for project documentation and quality audits.
Procurement strategy:
Send a clear RFQ that includes grade (UNS number), NPS, schedule, finish, governing standard, and quantity. Compare at least three supplier proposals based on pricing, lead time, MTC availability, and order quantities. For bulk orders, schedule a pre-dispatch inspection (PDI) or third-party inspection (TPI) at the manufacturer's site.
Super Duplex Steel Tubing Suppliers
Super Duplex Steel Tubing FAQ's
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jayhind metal & tubes 
mumbai - maharashtra - india
m.a.international
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shubh alloys inc
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citizen metals pvt. ltd
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nippen tubes
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aurum alloys engg. llp
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sparsh impex
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rajveer stainless and alloys
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piyush steel pipes
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naman pipe and tubes
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mbm tubes pvt. ltd.
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jaydeep steels
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katariya steel
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kriton steel and engineering co.
mumbai - maharashtra - india
leoscor alloys & steel inc.
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zhejiang zhonggang steel
n/a - n/a - china
shatrunjay special alloy
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route pipe works pvt ltd.
jalna - maharashtra - india
route pipe works pvt ltd.
jalna - maharashtra - india
r s metal
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special metals
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dinmani pipes & fittings
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shashwat pipes
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nickel alloy corporation
n/a - n/a - india
absolute metal solutions
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shree metal
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kanak steel & engineering company
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randhir metal and alloys pvt ltd
mumbai - maharashtra - india
rajendra forge fitting & flanges
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nextgen steel and alloys
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steellite metal and tubes
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tricon steel and alloys
mumbai - maharashtra - india
robust special metals
mumbai - maharashtra - india
unimix metal corporations
mumbai - maharashtra - india
calico metal alloys llp
mumbai - maharashtra - india
astralloy india
mumbai - maharashtra - india
neelkamal alloys llp
mumbai - maharashtra - india
belmount nickel & alloys
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metcore alloys
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kenco tubes
mumbai - maharashtra - india
leoscor export
mumbai - maharashtra - india
toshiba metal
n/a - n/a - india
abhay steels
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apexia metal
mumbai - maharastra - india
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