Super Duplex Steel Instrumentation Fittings

Super duplex tube fittings are precision-engineered connectors that connect, redirect, or terminate tubing in high-corrosion, high-pressure fluid systems. These components are also known as Super Duplex Steel Tube Fittings and are made from alloys like UNS S32750 and UNS S32760, which include about 25% chromium, 7% nickel, and 3.5-4% molybdenum. The Super duplex tube fittings have a tensile strength of 800-900 MPa and a PREN value of more than 40, providing outstanding resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. The key applications include offshore oil and gas systems, chemical processing, desalination, marine engineering, and subsea pipelines, where standard alloys fail to perform.

Super Duplex Tube Fittings Prices

Super duplex tube fitting prices in India depend on 5 key factors. Understanding these elements will allow you to accurately predict your budget and reduce unexpected expenses during the project.

Approximate Price Range

In India, super duplex tube fittings range in price from Rs 940 to Rs 1,500 per piece. The cost per unit can be reduced by purchasing in bulk from trusted suppliers of super duplex tube fittings.

Factors Affecting Price

The price of super duplex tube fittings depends on the material grade, size, wall thickness, connection type, testing, and order quantity. Higher-alloy grades like UNS S32750 and S32760, as well as larger sizes and thicker walls, cost more as they require more material. Compression and flared fittings are also pricier since they need more precise machining. Extra testing and certifications add further cost, while buying in bulk usually brings down the price per piece.

Super Duplex Tube Fittings Grades

Super duplex tube fittings are available in 5 standard alloy grades, each suited to specific corrosion and pressure service environments.

Super Duplex Steel UNS S32760 Tube Fittings
Super Duplex Steel 2507 Tube Fittings
Super Duplex Steel Zeron 100 Tube Fittings
Super Duplex Steel Ferralium 255 Tube Fittings
Super Duplex Steel UNS S32750 Tube Fittings

Types Of Super Duplex Tube Fittings

The Super duplex tube fittings are manufactured in 5 different types to meet various connection methods, pressure requirements, and system configurations.

Super Duplex Ferrule Fittings (Double/Single)
Super Duplex Pipe Fittings (Butt-Weld)
Super Duplex Forged / Threaded Fittings
Positionable / Swivel Fittings
Tube Closures

Super Duplex Tube Fittings Specifications

The table below outlines the standard material grades, dimensional parameters, pressure capabilities, and certification requirements used when specifying super duplex tube fittings for industrial procurement.

Parameter	Specification
Material Grade	Super Duplex 2507, UNS S32750, UNS S32760
Product Type	Super duplex tube fittings for instrumentation and process tubing
Standard / Specification	ASTM A815 for buttweld fittings; ASTM A182 F53/F55 for forgings
Dimensional Basis	Tube OD-based fittings, not pipe schedule-based
Connection Types	Compression, socket weld, butt weld, threaded/instrumentation styles
Size Range	1/8" to 2" for tube fittings; metric sizes from 3 mm to 50 mm
Manufacturing Form	Seamless, welded, and forged depending on fitting type
Corrosion Resistance	High resistance to pitting, crevice corrosion, and chloride SCC
Strength	High tensile and yield strength, suitable for high-pressure service
Typical Applications	Offshore, marine, chemical processing, desalination, and high-corrosion process lines
Temperature Use	Best suited to demanding corrosion service rather than extreme hot/cold service
Typical Certification	EN 10204 3.1 / mill test certification is commonly supplied

Super Duplex Tube Fittings Size Chart

The size chart below covers tube OD availability and the typical fitting applications for each size, from small-bore instrumentation to heavy-duty process lines.

Tube OD	Common Availability	Typical Fitting Use
1/8"	Special/small-bore instrumentation size	Compression fittings, adaptors
1/4"	Common instrumentation size	Elbows, tees, unions, ferrules
3/8"	Common instrumentation size	Compression fittings, adapters
1/2"	Common tube fitting size	Elbows, tees, reducers, unions
5/8"	Available in some systems	Instrumentation and process fittings
3/4"	Common medium-bore size	Compression and weld fittings
1"	Common larger tube fitting size	Elbows, reducers, tees
1 1/4"	Larger tube fitting size	Special / custom-fabricated fittings
1 1/2"	Larger tube fitting size	Special / custom-fabricated fittings
2"	Largest common tube fitting size	Heavy-duty tube fittings

Schedule Chart Of Super Duplex Tube Fittings

Use the schedule chart below to match the required wall thickness to your NPS/OD range before specifying a super duplex tube fitting for a given pressure or service class.

NPS / OD	Sch 5S	Sch 10S	Sch 10	Sch 40S / STD	Sch 80S / XS	Sch 160	XXS
1/8"	0.886 mm	1.24 mm	1.24 mm	—	—	—	—
1/4"	1.24 mm	1.65 mm	1.65 mm	2.87 mm	—	—	—
3/8"	1.24 mm	1.65 mm	1.65 mm	2.87 mm	—	—	—
1/2"	1.65 mm	2.11 mm	2.11 mm	2.77 mm	3.73 mm	9.53 mm	9.53 mm
3/4"	1.65 mm	2.11 mm	2.11 mm	2.87 mm	3.91 mm	10.31 mm	10.31 mm
1"	1.65 mm	2.24 mm	2.24 mm	3.38 mm	4.55 mm	12.70 mm	12.70 mm
1 1/4"	1.65 mm	2.24 mm	2.24 mm	3.56 mm	5.08 mm	12.70 mm	12.70 mm
1 1/2"	1.65 mm	2.24 mm	2.24 mm	3.56 mm	5.16 mm	14.27 mm	14.27 mm
2"	1.65 mm	2.77 mm	2.77 mm	3.91 mm	6.35 mm	18.26 mm	18.26 mm

Key Features Of Super Duplex Tube Fittings

Super duplex tube fittings carry 8 performance features that make them the preferred choice over standard stainless steel or carbon steel fittings in critical service conditions.

High Strength
Corrosion Resistance
Versatility
Temperature Resistance
Cost-Effectiveness
Ease of Installation
Stress Corrosion Cracking (SCC) Resistance
Erosion-Corrosion Resistance

Applications Of Super Duplex Tube Fittings

Super duplex tube fittings are actively used across 8 industries where corrosion control, pressure integrity, and material longevity are non-negotiable.

Oil and Gas Industry
Chemical Processing Plants
Marine Applications
Pharmaceutical Industry
Power Generation Plants
Food and Beverage Industry
Desalination Plants
Pulp and Paper Industry

How To Choose The Right Super Duplex Tube Fittings Supplier And Manufacturer?

Choosing the right source for super duplex tube fittings directly impacts procurement cost, material integrity, and on-site delivery. Before placing any order, evaluate the following 4 criteria carefully.

Selecting The Right Supplier And Manufacturer

Ensure that the manufacturer offers the exact grade, size, and alloy range your project needs. Confirm that they are ISO 9001 certified. Before placing an order, ask for material test reports (MTRs) and dimensional inspection certificates.

Technical Considerations

Select the fitting type based on the operating temperature, fluid media, and working pressure. Compression or flared fittings with smooth, polished bores are often used in systems over 6,000 psi, as standard threaded fittings are not reliable at such high pressures. Before purchasing super duplex tube fittings, ensure that the fitting parameters match the tube's outer diameter (OD) and wall thickness.

Evaluating Supplier Credibility

Before placing an order, examine the supplier's export compliance documentation, client testimonials, and delivery performance history. A reliable super duplex tube fittings supplier provides comprehensive material traceability reports, dimensional inspection certifications, and compliance documents for ASTM, EN, or DIN standards within the specified time.

Procurement Strategy

For repeat orders, use long-term supply contracts with manufacturers to fix the prices and maintain material consistency across batches. For one-time projects, confirm the Minimum Order Quantity (MOQ), lead time, and packaging requirements. Late-stage changes in these areas are a primary reason project timelines get delayed.