Manufacturer, Supplier & Exporter of UNS S32750 Spool

UNS S32750, also known as Super Duplex 2507, is a high-performance duplex stainless steel grade renowned for its excellent strength and outstanding corrosion resistance. Its two-phase microstructure, consisting of roughly equal parts austenite and ferrite, delivers superior mechanical and chemical properties compared to standard austenitic or ferritic stainless steels, making it ideal for demanding industrial applications such as oil and gas pipelines, chemical processing, and desalination plants..

The chemical composition of Super Duplex 2507 is carefully engineered for high corrosion resistance. It typically contains 24–26% chromium, 6–8% nickel, 3–5% molybdenum, and 0.24–0.32% nitrogen, with a very low carbon content (≤ 0.03%) to prevent carbide precipitation. This combination ensures excellent resistance against pitting, crevice corrosion, and stress corrosion cracking (SCC), even in chloride-rich or harsh environments..

Mechanically, UNS S32750 exhibits remarkable performance. The yield strength (0.2% offset) is approximately 550 MPa, and the tensile strength ranges from 800–900 MPa, depending on the fabrication process. Its elongation is typically around 15–20%, providing a balance of strength and ductility. The material also maintains relatively low hardness, which aids in fabrication, welding, and forming processes..

Super Duplex 2507 spools are highly valued in industries requiring corrosion-resistant piping solutions. Their ability to withstand high chloride content, acids, and elevated temperatures makes them ideal for offshore oil and gas operations, marine environments, chemical transport pipelines, and heat exchangers. The spools are pre-fabricated pipe segments that simplify installation while maintaining the full corrosion resistance of the base material..

The domestic supply network for Riddhi Siddhi Impex spans most major industrial and metro cities in India, including Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru, Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Ankleshwar, Navsari, Valsad, Rajpipla, and surrounding industrial hubs. This widespread network allows industries across India to access Super Duplex spools with reduced lead times compared to imported products..

UNS S32750 (Super Duplex 2507) Spool

Specification

Product Name	UNS S32750 Spool
Manufacturer	Riddhi Siddhi Impex
Material Grade	Super Duplex 2507 / UNS S32750
Type	Seamless / Welded / ERW
Diameter	DN 15 to DN 600 (customizable)
Length	Single random, double random, or cut lengths
End Type	Beveled End (BE), Plain End (PE), or Threaded
Applications	Oil & Gas, Chemical, Marine, Desalination, Heat Exchangers

Chemical Composition (UNS S32750)

Element	Content (%)
Carbon (C)	≤ 0.03
Chromium (Cr)	24–26
Nickel (Ni)	6–8
Molybdenum (Mo)	3–5
Nitrogen (N)	0.24–0.32
Manganese (Mn)	≤ 2
Silicon (Si)	≤ 1
Iron (Fe)	Balance
Copper (Cu)	≤ 0.5

Mechanical Properties

Property	Value
Tensile Strength	800–900 MPa
Yield Strength (0.2% offset)	≥ 550 MPa
Elongation	15–20%
Hardness	≤ 320 HB
Impact Toughness	Excellent, good for low temperatures
Corrosion Resistance	Outstanding against pitting, crevice, and stress corrosion

Dimension Chart (Nominal)

Nominal Pipe Size (DN)	Outside Diameter (mm)	Wall Thickness (mm)	Length (m)
15	21.3	2.77	Up to 12
50	60.3	3.91	Up to 12
100	114.3	6.02	Up to 12
150	168.3	7.11	Up to 12
250	273.1	9.27	Up to 12
400	406.4	12.70	Up to 12

Equivalent Grades

Standard	Equivalent Grade
ASTM / ASME	ASTM A789 / A182 F55
EN	EN 1.4410 / 2507
DIN	X2CrNiMoN25-7-4
JIS	SUS32750

Equivalent Standards

Standard	Description
ASTM A789	Seamless and welded Super Duplex Stainless Steel Tubes
ASTM A182	Forged or Rolled Alloy and Stainless Steel Pipe Flanges and Fittings
EN 10216-5	Seamless Steel Tubes for Pressure Purposes

Other Types of Duplex and Super Duplex Pipes

Type	Description
Duplex 2205 Pipes	Balanced austenitic-ferritic steel with excellent corrosion resistance
Super Duplex 2507 Pipes	High-strength, high corrosion-resistant material for aggressive environments
Lean Duplex Pipes	Cost-effective duplex steel with moderate corrosion resistance
Fittings and Flanges	Forged and welded fittings in duplex and super duplex grades

Fabricating and welding Super Duplex 2507 spools requires specialized expertise. Proper welding consumables such as ER2594 and careful post-weld treatment (solution annealing) are necessary to preserve the balanced ferrite-austenite microstructure. Incorrect handling can lead to embrittlement or phase imbalance, potentially compromising corrosion resistance and mechanical integrity.

Frequently Asked Questions (FAQs)

Q1: What industries commonly use UNS S32750 spools?

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

Q2: Can Riddhi Siddhi Impex supply custom spool dimensions?

A2: Yes, they provide customized diameters, wall thicknesses, and lengths according to client requirements.

Q3: Is Super Duplex 2507 resistant to chloride corrosion?

A3: Yes, UNS S32750 exhibits outstanding resistance to pitting, crevice, and stress corrosion cracking in chloride-rich environments.

Q4: Which Indian cities can procure UNS S32750 spools from Riddhi Siddhi Impex?

A4: They are supplied across Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru, Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Ankleshwar, Navsari, Valsad, Rajpipla, and other industrial hubs.