UNS S32550|1.4507|S32550 Seamless Super Duplex Steel Pipe
What Is UNS S32550 Seamless Pipe?
UNS S32550 Seamless Super Duplex Pipe Overview
UNS S32550 seamless pipe, also known as Ferralium 255, is a copper-bearing super duplex stainless steel pipe selected for high strength and resistance to pitting, crevice corrosion and stress-corrosion cracking in chloride and acidic process environments. Seamless construction is commonly specified where pressure integrity and uniform wall structure are important.
| Product | UNS S32550 seamless super duplex stainless steel pipe |
|---|---|
| Alternative name | Ferralium 255 / Alloy 255 |
| Primary standards | ASTM A790 / ASME SA790; project specifications subject to review |
| Key alloy feature | High chromium with molybdenum, nitrogen and copper |
| Typical service | Chemical processing, offshore systems, seawater, desalination and FGD equipment |
| Supply basis | Grade, OD, wall thickness, length, schedule, heat treatment and inspection requirements |
Chemical Composition of UNS S32550
Values below are an engineering reference. Contractual limits must follow the governing standard, edition and purchase order.
| Grade | C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu |
|---|---|---|---|---|---|---|---|---|---|---|
| S32550 | ≤0.04 | ≤1.50 | ≤0.040 | ≤0.030 | ≤1.00 | 4.50–6.50 | 24.00–27.00 | 2.90–3.90 | 0.10–0.25 | 1.50–2.50 |
Mechanical and Physical Property Reference
| Tensile strength | Yield strength | Elongation | Hardness | |
|---|---|---|---|---|
| Reference value | ≥850 MPa | ≥580 MPa | ≥25% | ≤320 HBW |
| Procurement note | Indicative product data; acceptance values must follow the applicable ASTM/ASME edition and MTC. | |||
Standards, Manufacturing and Testing
| Item | Available scope |
|---|---|
| Manufacturing route | Hot piercing or extrusion, cold drawing/pilgering where required, solution annealing, straightening and finishing |
| Dimensional control | OD, wall thickness, length, straightness and surface inspection against the purchase specification |
| Integrity testing | Hydrostatic or nondestructive electric testing; UT or eddy-current testing when specified and applicable |
| Documents | Material Test Certificate, chemical and mechanical results, dimensional report and additional inspection records as ordered |
| Optional verification | PMI, corrosion testing and third-party inspection subject to technical and contractual review |
Typical Applications
| Industry | Typical equipment or service | Selection reason |
|---|---|---|
| Oil and gas | Flowlines, manifolds and sour-service systems | High strength and chloride resistance |
| Chemical processing | Sulfuric and phosphoric acid equipment | Copper-bearing alloy chemistry |
| Marine and desalination | Seawater piping and RO systems | Resistance to localized corrosion |
| Environmental systems | FGD and pollution-control equipment | Resistance in aggressive process media |
Grade Selection Comparison
| Grade | Key distinction | Typical selection focus |
|---|---|---|
| S32550 | Copper-bearing Ferralium 255 | Acidic chemical and seawater duties |
| S32750 | Widely specified Alloy 2507 / F53 | Offshore, desalination and chloride service |
| S32760 | Tungsten- and copper-alloyed F55 | Severe offshore and erosive service |
| S32950 | Higher chromium, leaner molybdenum range | Selected industrial chloride environments |
Information Required for a Quotation
| Material | UNS S32550 and governing standard |
|---|---|
| Dimensions | OD × wall thickness × length or NPS × schedule |
| Quantity | Number of pieces or total weight |
| Condition | Heat treatment, surface, ends and packing |
| Inspection | MTC, NDT, PMI, corrosion testing or third-party inspection |
Frequently Asked Questions
What is UNS S32550 pipe?
It is a copper-bearing super duplex stainless steel pipe, commonly known as Ferralium 255, designed for high strength and corrosion resistance in demanding chloride and acidic environments.
Which standard is commonly specified?
ASTM A790 / ASME SA790 is commonly used for seamless and welded ferritic-austenitic stainless steel pipe. The exact edition, dimensions and supplementary requirements should be stated in the purchase order.
What should a buyer send for quotation?
Send the grade, standard, OD, wall thickness, length, quantity, delivery condition, inspection requirements and destination for technical review.
See the complete Super Duplex Stainless Steel Seamless Pipe range. Final availability and compliance are subject to formal review of the standard, drawing and purchase order.
Ready to Request a Quotation?
Send your UNS S32550 Seamless Pipe enquiry with grade, applicable ASTM/ASME standard and edition, OD × wall thickness, length, quantity, end finish, delivery destination and inspection documents — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.
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