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Home » Products » Duplex Stainless Steel Pipe And Tube » Duplex Steel » UNS32550 S25554 255 1.4507 SUPER DUPLEX STEEL SEAMLESS PIPE AND TUBE

UNS32550 S25554 255 1.4507 SUPER DUPLEX STEEL SEAMLESS PIPE AND TUBE

①　STANDARD: ASTM A789/ ASTM A790/ ASTM A928/ ...
②　OD RANGE : 6-720 MM
③　THICKNESS RANGE: 1-65 MM

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Chemical Composition

Mechanical Properties

Applications

Service

Material Summary

Chemical Composition

Grade	C	Mn	P	S	Si	Ni	Cr	Mo	N	Cu
S32550	≤0.04	≤1.5	≤0.040	≤0.03	≤1.00	4.50-6.50	24.00-27.00	2.90-3.90	0.10-0.25	1.50-2.50

Mechanical Properties

Grade

Tensile Strength

ksi(MPa)

Yield Strength

ksi (MPa)

Elongation (%)

Hardness

HBW

Hardness

HRC

S32550

≥110(760)

≥80(550)

≥15

≤297

≤31

Applications

UNS S32550, also known as FERRALIUM 255, is a duplex stainless steel alloy with remarkable properties. Let’s explore its applications in various industries:

Chemical Processing:

FERRALIUM 255 is widely used in chemical processing equipment due to its excellent resistance to highly acidic environments.
It finds applications in reactors, heat exchangers, and other components exposed to aggressive chemical media.

Marine Engineering:

In marine environments, FERRALIUM 255 is suitable for marine fixtures, pump and mixer shafts, and other components.
Its ability to withstand saltwater corrosion ensures longevity in harsh conditions.

Seawater Desalination Plants:

The alloy is commonly used in desalination plants due to its high resistance to pitting and crevice corrosion.
It ensures efficient operation in these critical facilities.

Oil and Gas Industry:

FERRALIUM 255 is a cost-effective alternative to materials such as nickel alloys and brass.

It finds applications in offshore platforms, deck hardware, rudders, shafting, and other components.

Paper Industry:

FERRALIUM 255 has been used to replace conventional stainless steel equipment in the paper industry.

It addresses corrosion problems caused by environmental laws that forced recycling of process liquids.

Remember that FERRALIUM 255 combines the desirable aspects of both austenitic and ferritic grades, making it valuable in demanding industrial settings.

Service

Testing

EN 10204/3.1B, EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
Raw Materials Certificate
100% Radiography Test Report
100% PMI
Heat Treatment Charts
Third Party Inspection Report
Surface roughness and size measurement
Manufacturer Test Certificate( Impact Testing, Flatten, Spin,Curve, Hardness, Intergranular ,Point corrosions, Grain size, ET,UT, HT...)
Laboratory Test Certificate from Govt. Approved Lab
......

End of Pipe and Tube

BE : Beveled end
BBE : Bevel both ends
BLE : Bevel large end
BSE : Bevel small end
TOE / POE = Treaded One End / Plain One End
TOE / BOE = Treaded One End / Beveled One End
POE / BOE = Plain One End / Beveled One End
TBE = Treaded Both Ends
PBE = Plain Both Ends

Marking

Supplier / Manufacturer Name or Custom Logo - on request
Specification
Material Grade
Nominal Size
Schedule or Wall Thickness
Method of Manufacturing (Seamless or Welded)
Heat Number

Marked Pipe Sample: XTD ASTM A790 UNS 32250 SEAMLESS 42.2x 3.56*6000MM HEAT NO. 2023121205A15

Packing

Ply Wooden Boxes
PE Fabric Bundles
Standard seaworthy export packing
Plastic Bags, or as required

Delivery

Pickled&Annealed, Polished, Bright Annealed.
All tubes shall be supplied as per applicable ASTM B163 /B426
Mill test certificates will be issued
We can provide 3.2 Certification according to the needs of you

Standard

ASTM A789: Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless SteelTubing for General Service
ASTM A790: Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

Material Summary

Super duplex UNS S32550 is a stainless steel grade that offers excellent corrosion resistance in a wide variety of corrosive chemicals including sulphuric, phosphoric and nitric acids. In Seawater and other chloride containing environments 32550 also provides outstanding resistance to pitting and crevice corrosion, with Critical Pitting Temperature exceeding 50°C.

Excellent ductility and impact strength at both ambient and sub-zero temperatures combine with a high resistance to abrasion, erosion and cavitation erosion.

UNS S32550 Displays superior corrosion resistance in most media. Also, 2550 typically out performs duplex alloy 2205. It performs well in sulphuric, phosphoric, and nitric and shows excellent resistance to organic acids such as acetic and formic acid. Highly reducing media should be avoided.