Manufacturer, Supplier & Exporter of Super Duplex 2507 Spool

Super Duplex 2507, also known by its UNS designation S32750, is a high-performance stainless steel alloy combining austenitic and ferritic microstructures. This super duplex grade offers exceptional mechanical strength and superior corrosion resistance, making it ideal for highly aggressive environments, such as offshore oil and gas, chemical processing, and desalination plants. Its balanced duplex structure ensures resistance to pitting, crevice corrosion, and stress corrosion cracking, even in chloride-rich and acidic conditions.

The chemical composition of Super Duplex 2507 typically includes 24–26% chromium, 6–8% nickel, 3–5% molybdenum, and 0.24–0.32% nitrogen, with a very low carbon content around 0.03% to prevent carbide precipitation. Minor elements like manganese and silicon add structural stability. This carefully designed composition provides a high Pitting Resistance Equivalent Number (PREN), ensuring long-term durability in extreme environments.

Mechanically, Super Duplex 2507 is known for its high yield strength (≈550 MPa) and ultimate tensile strength (≈800–900 MPa), combined with good toughness and moderate ductility (≈15% elongation). The hardness is generally limited to Rockwell C32, allowing easy fabrication into spools, pipes, and fittings. Its excellent mechanical performance makes it suitable for both pressure-bearing components and structural spools in demanding industrial applications..

Super Duplex 2507 spools provide outstanding corrosion resistance in seawater, chemical solutions, and high-chloride environments. They are particularly resistant to chloride-induced stress corrosion cracking, making them suitable for offshore platforms, subsea pipelines, and heat exchangers. The combination of strength and corrosion resistance allows engineers to design thinner sections without compromising performance, which is ideal for spool fabrication..

Riddhi Siddhi Impex, a prominent manufacturer and supplier in India, offers Super Duplex 2507 spools to industries across the country. The company specializes in stainless steel, duplex, and super duplex steel products, including sheets, plates, coils, pipes, and fabricated components. Their expertise ensures high-quality production, including buttweld fittings and custom spools, meeting stringent industrial requirements..

Super Duplex 2507 Spool

Specification

Product Name	Super Duplex 2507 Spool
Manufacturer	Riddhi Siddhi Impex
Material Grade	EN 1.4410 / UNS S32750
Material Type	Duplex Stainless Steel
Standard	ASTM A182 / ASME SA182 / EN 10222
Spool Form	Seamless, Welded
Surface Finish	2B, Polished, Pickled & Passivated
Applications	Oil & Gas, Chemical Plants, Desalination, Offshore Projects, Heat Exchangers

Chemical Composition

Element	Composition (%)
Carbon (C)	0.03 Max
Chromium (Cr)	24 – 26
Nickel (Ni)	6 – 8
Molybdenum (Mo)	3 – 5
Nitrogen (N)	0.24 – 0.32
Manganese (Mn)	1.0 Max
Silicon (Si)	0.8 Max
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	800 – 900 MPa
Yield Strength (0.2% offset)	550 MPa Min
Elongation	≈15%
Hardness	≤ 32 HRC
Impact Toughness	Excellent at -50°C
Corrosion Resistance	High resistance to pitting, crevice, and stress corrosion

Dimension Chart (Nominal)

Nominal Pipe Size (NB)	Outside Diameter (mm)	Wall Thickness (mm)	Length
1/2"	21.3	2.77	Up to 12 m
1"	33.4	3.38	Up to 12 m
2"	60.3	3.91	Up to 12 m
4"	114.3	6.02	Up to 12 m
6"	168.3	7.11	Up to 12 m
8"	219.1	8.18	Up to 12 m

Equivalent Grades

Standard	Grade
UNS	S32750
EN	1.4410
ASTM	A182 F53 / F55
DIN	X2CrNiMoN25-7-4

Equivalent Standards

Standard	Description
ASTM A182	Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves
ASME SA182	Standard for Alloy and Stainless Steel Forgings for Piping Components
EN 10222-5	Steel Forgings for Pressure Purposes - Duplex and Super Duplex Grades

Other Types of Duplex/Super Duplex Pipes

Type	Description
Duplex 2205 Pipes	Standard duplex stainless steel with excellent corrosion resistance
Super Duplex 2507 Pipes	High-strength, high-corrosion-resistant super duplex steel
Fittings & Flanges	Custom-made duplex and super duplex stainless steel fittings
Welded & Seamless Spools	Fabricated spools in duplex/super duplex for industrial pipelines

Super Duplex 2507 spools are widely used in offshore oil and gas infrastructure, desalination plants, chemical processing units, and marine structures. Their high strength-to-weight ratio, combined with excellent resistance to localized corrosion, makes them ideal for pipelines, risers, manifolds, and heat exchangers. The spools can be fabricated into custom lengths and shapes to meet project-specific requirements..

Frequently Asked Questions (FAQs)

Q1: What are the key applications of Super Duplex 2507 Spools?

A1: They are widely used in offshore oil & gas, chemical processing, desalination plants, heat exchangers, and marine applications.

Q2: Can Riddhi Siddhi Impex supply spools in custom lengths?

A2: Yes, Super Duplex 2507 spools can be fabricated in custom lengths and diameters according to project requirements.

Q3: What makes Super Duplex 2507 superior to 2205 duplex steel?

A3: Super Duplex 2507 has higher chromium, molybdenum, and nitrogen content, resulting in greater corrosion resistance and higher mechanical strength.

Q4: Which Indian cities can receive domestic supply of these spools?

A4: Domestic supply is available in major cities like Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Jaipur, and many others.