Manufacturer, Supplier & Exporter of Duplex 2205 Spool

Duplex 2205 spools are pre-fabricated pipeline assemblies manufactured using Duplex 2205 (UNS S31803 / S32205) stainless steel, a duplex alloy known for its dual-phase microstructure and exceptional resistance to corrosion, pitting, and stress-corrosion cracking. These spools are widely utilized in chemical processing units, desalination plants, power industries, petrochemical plants, offshore structures, and high-pressure fluid transport systems. Due to the high yield strength of Duplex 2205—almost double that of conventional austenitic stainless steels like 316L—these spool components offer long-term durability and superior mechanical stability in severe service conditions. The use of Duplex 2205 material in spool fabrication significantly reduces wall thickness requirements, leading to lighter assemblies while preserving high structural integrity..

Riddhi Siddhi Impex, a recognized supplier and manufacturer of Duplex 2205 materials, plays an important role in supplying Duplex 2205 spools to India’s domestic industries. Known for delivering quality-certified duplex products such as pipes, coils, buttweld fittings, flanges, and fabricated assemblies, the company supports custom spool fabrication through its network of allied fabrication units. Their Duplex 2205 products undergo rigorous quality testing, including PMI Testing, ultrasonic testing, hydrostatic testing, and dimensional accuracy inspections, ensuring that the spools and piping components meet ASTM, ASME, and international manufacturing standards. With a strong presence in Mumbai’s industrial metal market, Riddhi Siddhi Impex has expanded its dealer and distributor network across several major Indian cities..

Duplex 2205 spools supplied by manufacturers like Riddhi Siddhi Impex offer a balanced combination of high tensile strength, corrosion resistance, and stress endurance, making them ideal for corrosive media such as chlorides, acidic effluents, and seawater. The alloy contains approximately 22% chromium, 5% nickel, 3% molybdenum, and nitrogen-enhanced composition, giving it remarkable resistance against pitting in chloride-rich environments. This makes Duplex 2205 spool assemblies a preferred choice over stainless steel 304/316 spools, especially in coastal regions, marine applications, and chemical processing plants. The material’s high fatigue strength also ensures smooth performance under cyclic load conditions, which is crucial for pipeline systems experiencing fluctuating pressures or temperatures..

In India, Duplex 2205 spool assemblies are in high demand across industries that deal with aggressive chemicals, seawater cooling, oil transport, and high-temperature processes. Refineries in Gujarat (Dahej, Jamnagar, Vadodara), petrochemical zones in Maharashtra (Mumbai, Pune, Kolhapur, Nagpur), and chemical processing clusters in Tamil Nadu (Chennai, Coimbatore, Madurai) widely use Duplex 2205 spools for long-term, leak-free, low-maintenance pipeline operations. The power generation sector—particularly thermal and nuclear power stations—also utilizes Duplex 2205 spools in feedwater systems, condenser piping, heat-exchange circuits, and brine-handling units. These spools provide a sustainable alternative to carbon-steel spools, significantly increasing service life and reducing lifecycle costs...

As a domestic supplier, Riddhi Siddhi Impex caters to a wide network of industrial destinations such as Mumbai, Delhi, Bengaluru (Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru (Mysore), Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Dahej, Narmada, Ankleshwar, Navsari, Valsad, Rajpipla, Somnath and Vilayat. Their strong dealer and transporter network ensures timely delivery of Duplex 2205 spools and raw materials to fabrication plants, EPC contractors, government projects, and private industries. This domestic presence strengthens India’s ability to locally source high-grade duplex materials without relying heavily on imported products..

PP Coated Carbon Steel Pipes

Specification

Product Name	PP Coated Carbon Steel Pipes
Manufacturer	Riddhi Siddhi Impex
Base Material	Carbon Steel (ASTM A106 / A53 / API 5L)
Coating Material	Polypropylene (PP) – Single or 3-Layer (3LPP)
Standard	ISO 21809-1 / DIN 30678 / ASTM / API
Size Range	1/2” NB to 48” NB
Wall Thickness	Sch 20 to Sch 160 / XXS
Length	Single Random, Double Random, or Cut Lengths
Coating Thickness	1.8 mm to 4.5 mm (Customizable)
Pipe Ends	Plain End (PE), Beveled End (BE), or Threaded
Form	Seamless, Welded, ERW, or LSAW
Applications	Oil & Gas Pipelines, Water Supply, Chemical Transport, Marine Projects

Chemical Composition (Base Carbon Steel)

Element	Content (%)
Carbon (C)	0.23 Max
Manganese (Mn)	0.30 – 1.06
Phosphorus (P)	0.05 Max
Sulfur (S)	0.045 Max
Silicon (Si)	0.10 – 0.35
Copper (Cu)	0.40 Max
Nickel (Ni)	0.40 Max
Chromium (Cr)	0.40 Max

Mechanical Properties

Property	Value
Tensile Strength	≥ 415 MPa
Yield Strength (0.2% offset)	≥ 240 MPa
Elongation	≥ 20%
Hardness	≤ 95 HRB
Impact Resistance	Excellent (Due to PP Coating)
Coating Adhesion	Strong Adhesion as per ISO 21809-1

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
10"	273.1	9.27	Up to 12 m
16"	406.4	12.70	Up to 12 m

Equivalent Grades

Standard	Grade
ASTM	A106 Grade B / A53 Grade B
API	5L Grade B / X42 / X52
EN	EN 10216 / EN 10224
DIN	St 37.2 / St 52.3
BS	3601 / 3602

Equivalent Standards

Standard	Description
ASTM A106 / A53	Standard Specification for Carbon Steel Pipe for High-Temperature and Pressure Service
API 5L	Specification for Line Pipe
ISO 21809-1	External Polypropylene Coatings for Buried or Submerged Pipelines
DIN 30678	3-Layer Polypropylene Coating for Steel Pipes

Other Types of Coated Steel Pipes

Type	Description
3LPE Coated Pipes	Three-layer polyethylene coated pipes for enhanced corrosion protection
FBE Coated Pipes	Fusion Bonded Epoxy coated pipes with excellent adhesion and corrosion resistance
Internal Epoxy Coated Pipes	Internal epoxy lining for smooth fluid transport and reduced friction loss
PE Coated Pipes	Polyethylene-coated carbon steel pipes used for underground pipelines

Duplex 2205 spools supplied by Riddhi Siddhi Impex can be customized according to project drawings, isometric diagrams, and client-specific engineering requirements. Spool fabricators associated with the company manufacture complete assemblies consisting of pipe segments, elbows, reducers, flanges, supports, tees, branch connections, and welded fittings. These spools are typically delivered in ready-to-install form, which reduces on-site welding, installation time, and labour costs. Advanced welding procedures such as GTAW/TIG, SMAW, and orbital welding are used to maintain duplex structure balance and prevent weld-induced phase imbalance. Post-weld heat treatment (PWHT) and weld passivation are also carried out for corrosion resistance.

Frequently Asked Questions (FAQs)

Q1: What are the common applications of Duplex 2205 Spool?

A1: Duplex 2205 Spools are commonly used in oil & gas pipelines, desalination plants, chemical processing units, offshore platforms, heat exchangers, and high-pressure piping systems.

Q2: Can Duplex 2205 Spools be customized?

A2: Yes, Duplex 2205 Spools can be fabricated in custom sizes, diameters, lengths, and configurations based on project drawings, isometrics, and engineering specifications.

Q3: Is Duplex 2205 corrosion-resistant?

A3: Yes, Duplex 2205 provides excellent corrosion resistance, especially against pitting, crevice corrosion, and stress-corrosion cracking in chloride-rich and chemical environments.

Q4: What industries commonly use Duplex 2205 Spools?

A4: Industries such as petrochemicals, refineries, marine engineering, pulp & paper, water treatment, and food processing frequently use Duplex 2205 Spool assemblies.

Q5: What is the advantage of using Duplex 2205 over stainless steel 304/316?

A5: Duplex 2205 has nearly double the strength and superior corrosion resistance compared to SS 304/316, making it ideal for harsh industrial and marine environments.

Q6: Do you provide testing and certification for spools?

A6: Yes, all Duplex 2205 Spools undergo NDT, hydrotesting, PMI testing, and are supplied with MTCs (EN 10204 3.1/3.2) and other project-required certifications.

Q7: What end connections are available?

A7: Spools can be supplied with flanged ends, welded ends, threaded ends, or any customized end connection as per industry requirements.

Q8: Do you supply Duplex 2205 Spools across India?

A8: Yes, we supply Duplex 2205 Spools to major Indian cities including Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Ahmedabad, Surat, Vadodara, and many more industrial hubs.