Manufacturer, Supplier & Exporter of UNS S32550 Spool

UNS S32550 Spool is a high-performance duplex stainless steel product known for its excellent combination of strength, corrosion resistance, and durability in highly demanding industrial environments. With its balanced microstructure and alloying elements such as chromium, molybdenum, and nitrogen, UNS S32550 offers superior resistance to pitting, crevice corrosion, and stress corrosion cracking. When manufactured in spool form—such as coiled tubing spools, instrumentation spools, and wire spools—it becomes an ideal solution for continuous piping applications in chemical, marine, offshore, and high-pressure operations..

Riddhi Siddhi Impex, a leading manufacturer and supplier of stainless steel and duplex alloys in India, specializes in delivering high-quality UNS S32550 Spool products. Their spools are manufactured with stringent quality control, ensuring consistency, durability, and compliance with global standards like ASTM, ASME, and ISO. As a trusted domestic supplier, the company provides tailored spool sizes, lengths, and finishes based on customer requirements for oil & gas, petrochemical, desalination, and marine applications..

Due to its high strength and corrosion-resistant properties, UNS S32550 Spool is widely used in fluid transport systems, chemical injection lines, heat exchangers, desalination piping, and offshore umbilicals. The material’s exceptional resistance to seawater and acidic media makes it a preferred choice for coastal, marine, and offshore sectors where long-term reliability is crucial. These attributes make UNS S32550 a cost-effective alternative to more expensive nickel alloys while delivering comparable durability and mechanical performance..

Riddhi Siddhi Impex ensures that each UNS S32550 Spool is supplied with complete traceability, including Mill Test Certificates (MTC), chemical composition reports, mechanical property documentation, and compliance with NACE MR0175/ISO 15156 when required. Their advanced manufacturing processes guarantee uniform wall thickness, smooth surface finishing, and high dimensional accuracy, making the spools suitable for both automated and manual installation procedures..

As a domestic supplier, Riddhi Siddhi Impex supplies UNS S32550 Spools across major Indian metropolitan cities 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, and Mangalore. Their strong distribution network ensures timely delivery for both small-scale and large industrial projects..

UNS S32550 Spool

Specification

Product Name	UNS S32550 Spool (Ferralium 255 / Alloy 255)
Manufacturer / Supplier	Riddhi Siddhi Impex (Domestic supplier covering major Indian cities)
Material Grade	Super Duplex Stainless Steel - UNS S32550 (1.4507 / F61)
Forms Available	Coiled tubing spool, wire spool, instrumentation spool, welded coiled tubing
Typical OD Range	6.35 mm to 25.4 mm (custom sizes available)
Wall Thickness	0.6 mm – 4.0 mm (dependant on OD & application)
Spool Length	50 m to 1000+ m continuous coils (custom lengths possible)
Finish	Bright annealed, pickled, electropolished, or custom finish
Typical Applications	Subsea umbilicals, chemical injection lines, desalination plants, offshore & marine systems, high-pressure instrumentation tubing

Chemical Composition (typical ranges)

Element	Typical Content (%)
Chromium (Cr)	24.0 – 27.0
Nickel (Ni)	4.5 – 6.5
Molybdenum (Mo)	2.9 – 3.9
Copper (Cu)	1.5 – 2.5
Nitrogen (N)	0.10 – 0.25
Manganese (Mn)	≤ 1.50
Silicon (Si)	≤ 1.00
Carbon (C)	≤ 0.04
Phosphorus (P)	≤ 0.04
Sulfur (S)	≤ 0.03
Iron (Fe)	Balance

Mechanical Properties (typical)

Property	Typical Value / Range
Tensile Strength (Rm)	~760 – 900 MPa
Yield Strength (0.2% offset)	≥ 550 MPa (typical ~570–620 MPa depending on product form)
Elongation (A)	≥ 15% (commonly ≥ 25% on smaller sections / bars)
Hardness (Brinell)	~220 – 270 HB (typical max ~300 HB)
Pitting Resistance Equivalent Number (PREN)	≥ 40 (typical in the low–mid 40s)
Corrosion Resistance	Excellent resistance to pitting, crevice corrosion and chloride SCC; very good in seawater & many acidic media

Dimension Chart (typical spool sizes)

Outside Diameter (OD)	Wall Thickness (mm)	Typical Spool Length
6.35 mm (1/4")	0.60 – 0.89	Up to 500 m
9.52 mm (3/8")	0.89 – 1.24	Up to 400 m
12.70 mm (1/2")	1.24 – 1.65	Up to 300 m
19.05 mm (3/4")	1.65 – 2.11	Up to 150 m
25.40 mm (1")	2.11 – 3.00	Up to 100 m

Equivalent Grades / Trade Names

Reference	Equivalent / Trade Name
UNS	S32550
EN / Werkstoff	1.4507
Common Trade Name	Ferralium 255, Alloy 255, SD50
Other	Sometimes compared with super-duplex grades like S32760 (Zeron 100) for application selection

Equivalent Standards

Standard	Typical Product Standard / Description
ASTM / ASME	ASTM A240 / ASME SA240 (plates/sheets), ASTM A789 / ASME SA789 (tubing/pipe), various ASTM/ASME specs for bars, bolts & fasteners
NACE / ISO	NACE MR0175 / ISO 15156 suitability for sour service (when qualified)
EN	EN 10088 / EN 10216 / EN 10224 (as applicable for product form)

Other Types (related super-duplex & specialty spool materials)

Type	Typical Use / Notes
UNS S32760 (Zeron 100 / Super-duplex)	Very high pitting resistance; popular for subsea and seawater service
UNS S32750 / 2507	Super-duplex with very high PREN; used where extreme chloride resistance needed
UNS S32205 (Duplex 2205)	Lower cost duplex option for chemical injection & general service
Inconel 625 / Hastelloy C276	Nickel alloys for extreme corrosion or high temperature service

As a domestic supplier, Riddhi Siddhi Impex supplies UNS S32550 Spools across major Indian metropolitan cities 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, and Mangalore. Their strong distribution network ensures timely delivery for both small-scale and large industrial projects.

Frequently Asked Questions (FAQs)

Q1: What are common uses for UNS S32550 Spool?

A1: Typical uses include subsea umbilicals, chemical injection lines, desalination & brine handling, offshore hydraulic & instrumentation tubing, and other high-stress / corrosive service lines.

Q2: Can UNS S32550 spools be supplied in custom sizes and lengths?

A2: Yes — suppliers typically offer custom OD, wall thickness, spool length and end-fitting options to meet project specifications.

Q3: How does S32550 compare to other duplex grades?

A3: S32550 (Ferralium 255) is a high-strength super-duplex with added copper for improved sulfuric/acid resistance and a PREN often ≥ 40; it generally offers higher yield strength than many standard duplex grades (e.g., 2205) and differs slightly from S32760 in chemistry and performance tradeoffs.

Q4: Are test certificates and traceability provided?

A4: Reputable suppliers (including Riddhi Siddhi Impex) provide full Mill Test Certificates (MTC / EN 10204 3.1), chemical & mechanical test reports, heat number traceability and any project-specific documentation required.