Manufacturer, Supplier & Exporter of UNS S32003 Spool

UNS S32003, commonly referred to as Duplex 2003, is a high-strength, lean duplex stainless steel designed for industrial piping applications. Fabricated into spools, these pre-assembled pipe segments, fittings, and flanges enable seamless integration into complex piping systems, reducing on-site labor and welding requirements. Riddhi Siddhi Impex, a trusted manufacturer and supplier in India, specializes in producing high-quality Duplex 2003 spool assemblies that meet international standards and domestic industrial needs..

Duplex 2003 achieves its unique combination of strength and corrosion resistance through a balanced two-phase microstructure of ferrite and austenite. Its chemical composition typically includes 19.5–22.5% chromium, 3–4% nickel, 1.5–2.0% molybdenum, and 0.14–0.20% nitrogen. This carefully controlled composition ensures excellent pitting and crevice corrosion resistance, particularly in chloride-rich environments, while maintaining robust mechanical performance. The alloy’s nitrogen content also improves yield strength and enhances resistance to stress corrosion cracking.

Mechanically, UNS S32003 demonstrates outstanding strength compared to standard austenitic stainless steels. With a proof (yield) strength of approximately 510 MPa and an ultimate tensile strength of around 730 MPa, Duplex 2003 allows engineers to use thinner wall thicknesses while maintaining structural integrity. Its hardness and impact toughness make it an ideal choice for demanding applications where mechanical reliability is critical, such as industrial piping networks, chemical plants, and offshore installations..

Despite being a lean duplex stainless steel, UNS S32003 exhibits impressive corrosion resistance. It performs well against general corrosion, pitting, and stress corrosion cracking in moderately aggressive environments, surpassing traditional 316L austenitic stainless steel in many cases. This makes it suitable for water treatment, desalination plants, marine piping, and chemical processing industries, where resistance to chloride-induced corrosion is essential..

Riddhi Siddhi Impex specializes in fabricating Duplex 2003 spools to precise specifications. Each spool is assembled with high-quality fittings and welding techniques that preserve the duplex microstructure. Their experienced team ensures proper phase balance through controlled welding processes such as TIG and MIG, producing spools that are ready for immediate installation. This approach significantly reduces onsite labor, field welding, and project timelines.

UNS S32003 (Duplex 2003) Spool

Specification

Product Name	UNS S32003 Spool
Manufacturer	Riddhi Siddhi Impex
Base Material	Duplex Stainless Steel (UNS S32003 / Duplex 2003)
Standard	ASTM A182 / ASTM A240 / ASME B16.5
Size Range	Custom Diameter 15 mm to 500 mm
Wall Thickness	2 mm to 12 mm (customizable)
Length	Single Random, Double Random, or Cut Lengths
Form	Seamless, Welded, ERW, or LSAW
Applications	Chemical processing, Desalination, Marine, Industrial piping, Power Plants

Chemical Composition

Element	Content (%)
Carbon (C)	≤ 0.03
Chromium (Cr)	19.5 – 22.5
Nickel (Ni)	3.0 – 4.0
Molybdenum (Mo)	1.5 – 2.0
Nitrogen (N)	0.14 – 0.20
Manganese (Mn)	≤ 2.0
Silicon (Si)	≤ 1.0
Phosphorus (P)	≤ 0.03
Sulfur (S)	≤ 0.02

Mechanical Properties

Property	Value
Yield Strength	≥ 510 MPa
Tensile Strength	730 MPa
Elongation	≥ 25%
Hardness	≤ 280 HB
Impact Strength	≥ 40 J at 0°C

Dimension Chart (Nominal)

Nominal Diameter (mm)	Wall Thickness (mm)	Length
15 – 50	2 – 5	Custom
65 – 150	3 – 8	Custom
200 – 500	6 – 12	Custom

Equivalent Grades

Standard	Grade
EN	1.4462
AISI/SAE	UNS S32003
Sandvik	SAF 2205 Lean

Equivalent Standards

Standard	Description
ASTM A182 / A240	Standard for Duplex Stainless Steel Pipes & Fittings
ASME B16.5	Pipe Flanges and Flanged Fittings
EN 10088-1 / 2	European Standard for Stainless Steels

Other Types of Duplex Spools

Type	Description
Duplex 2205	Higher corrosion resistance, commonly used in chemical and marine applications
Duplex 2304	Lean duplex, moderate corrosion resistance, cost-effective alternative
Duplex 2507	Super duplex, excellent pitting and crevice corrosion resistance

Every Duplex 2003 spool supplied by Riddhi Siddhi Impex undergoes strict quality checks. Non-destructive testing (NDT) such as ultrasonic and radiographic inspections, hydrostatic testing, and positive material identification (PMI) confirm compliance with international standards. Material Test Certificates (MTC) are provided for traceability, ensuring that each spool meets the required specifications and performance expectations, which is critical for industrial and infrastructure projects.

Frequently Asked Questions (FAQs)

Q1: What are the common applications of UNS S32003 Spool?

A1: UNS S32003 spools are used in chemical processing, desalination, marine pipelines, cooling water systems, and industrial piping applications.

Q2: Can Riddhi Siddhi Impex provide custom spool dimensions?

A2: Yes, we supply custom spools in various diameters, wall thicknesses, and lengths based on client project requirements.

Q3: How corrosion-resistant is Duplex 2003?

A3: UNS S32003 provides moderate corrosion resistance and is suitable for chloride-containing environments while offering higher strength than standard austenitic stainless steels.

Q4: Are UNS S32003 spools supplied with quality certifications?

A4: Yes, every spool comes with Material Test Certificates (MTC), inspection reports, and compliance with ASTM/EN standards.