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Super Duplex 255 Sheet & Plate

Design Standards: ASTM A240, ASME SA240

Material Grade: Super Duplex 255 (UNS S32550 / Ferralium 255)

Alloy Category: High-Strength 25% Cr Super Duplex Stainless Steel

Corrosion Index: PREn > 40 (Excellent Pitting Resistance)

Thickness Range: 0.5 mm to 50 mm

Surface Finish: No.1 (HRAP), 2B, BA, No.4, Polished

Copper Content: Enhanced (2.0%) for Sulfuric Acid Resistance

Core Applications: Fertilizer Production, Marine Hardware, Chemical Scrubbers

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Super Duplex 255 Sheet & Plate (UNS S32550), often recognized by the trade name Ferralium 255, is the original "Super" duplex stainless steel. It is engineered with a 25% chromium content and a significant addition of copper (nominally 2%), which distinguishes it from other super duplex grades. This unique chemistry provides the alloy with exceptional resistance to strong reducing acids, particularly sulfuric and phosphoric acids, while maintaining the characteristic high mechanical strength of the duplex family.

Complying with ASTM A240 and ASME SA240, Grade 255 plates offer a Pitting Resistance Equivalent Number (PREn) greater than 40, ensuring total reliability in aggressive chloride environments such as seawater and brackish water. Beyond its chemical resistance, these plates exhibit superior wear, erosion, and cavitation resistance compared to standard austenitic steels. This makes them the premier choice for demanding applications in fertilizer production, marine propeller shafts, offshore oil and gas, and chemical scrubbers, where both mechanical durability and chemical inertness are critical for operational safety.

Super Duplex 255 Sheet & Plate Features

» Enhanced Acid Resistance: The 2.0% copper addition provides superior resistance to non-oxidizing acids, specifically sulfuric and phosphoric acids, compared to other super duplex grades.
» Exceptional Strength-to-Weight Ratio: Offers significantly higher yield strength than standard austenitic and 2205 duplex steels, allowing for thinner plate sections and reduced structural weight.
» High Pitting Resistance: With a PREn value typically exceeding 40, these plates provide maximum protection against pitting and crevice corrosion in seawater and high-chloride media.
» Outstanding Wear and Erosion Resistance: High surface hardness and mechanical integrity make it highly resistant to abrasive wear, cavitation, and erosion-corrosion in high-velocity fluid systems.
» Chloride Stress Corrosion Immunity: The balanced dual-phase microstructure ensures high resistance to chloride-induced stress corrosion cracking (SCC) even in elevated temperature service.
» Superior Fatigue Strength: Exhibits excellent fatigue strength in corrosive environments, making it ideal for critical components subjected to cyclic loading in marine conditions.
» Good Thermal Properties: Features higher thermal conductivity and a lower coefficient of thermal expansion than standard austenitic stainless steels, reducing thermal stress in heat exchangers.
» Excellent Ductility: Despite its high strength, Grade 255 retains good ductility and impact strength, even at sub-zero temperatures, ensuring safety against brittle fracture.

Super Duplex 255 Sheet & Plate Specification

Standard Specs

ASTM: A240 / A240M
ASME: SA240 / SA240M
UNS Number: S32550
Trade Name: Ferralium® 255

Chemical Profile

Chromium (Cr): 24.0% – 27.0%
Nickel (Ni): 4.5% – 6.5%
Copper (Cu): 1.5% – 2.5%
Molybdenum (Mo): 2.9% – 3.9%

Mechanical Data

Tensile Strength: 760 MPa (Min)
Yield Strength: 550 MPa (Min)
Elongation: 15% (Min)
Hardness: 302 Brinell (Max)

Size Range

Thickness: 0.5mm to 50mm
Width: 1000mm to 2500mm
Length: 2000mm to 12000mm
Forms: Plates, Sheets, Coils, Strips

Performance Index

PREn Value: ≥ 40
Density: 7.81 g/cm³
Magnetic: Yes (Ferritic-Austenitic)
Acid Service: Sulfuric & Phosphoric

Processing & Certs

Finishes: No.1, 2B, BA, No.4
Testing: G48 Corrosion, PMI, UT, Impact
Certification: EN 10204 3.1 & 3.2
Compliance: NACE MR0175

Super Duplex 255 Sheet & Plate Detailed Specifications

Property	Specification
Specifications	ASTM A240 / ASME SA240
Width	1000mm / 1219mm /1250mm / 1500mm / 2000mm
Length	2000 mm / 2440 mm / 2500 mm / 3000 mm / 6000 mm
Thickness	0.1mm to 12 mm Thk
Hardness	Soft, Hard, Half Hard, Quarter Hard, Spring Hard etc.
Finish	Hot rolled plate (HR), Cold rolled sheet (CR).
Form	Coils, Foils, Rolls, Plain Sheet, Strip, Flats, Blank (Circle), Ring (Flange) etc.

Super Duplex 255 Sheet & Plate Chemical Composition

Element	Composition %
C (Carbon)	Max 0.03
Cr (Chromium)	24.0 - 26.0
Ni (Nickel)	6.0 - 8.0
Mo (Molybdenum)	3.0 - 4.0
Fe (Iron)	Balance
Cu (Copper)	Max 0.5
Mn (Manganese)	1.0 - 2.0
Si (Silicon)	0.5
P (Phosphorus)	Max 0.03
S (Sulfur)	Max 0.02

Super Duplex 255 Sheet & Plate Equivalent Grades

Standard	Equivalent Grade
UNS S32750 (USA)	1.4410 (Germany)
EN 1.4410 (Europe)	JIS UNS S32750 (Japan)

Industrial Locations & Keywords

Industrial Locations & Keywords
Riyadh Industrial Cities (1st, 2nd, 3rd & Sudair)
Jeddah Industrial Cities (1st, 2nd & 3rd)
Dammam Industrial Areas (1st, 2nd & 3rd)
Jubail Industrial City
Yanbu Industrial City
Rabigh Industrial City
Al Khobar Industrial Area
Al Ahsa Industrial City
Madinah Industrial City
Makkah Industrial City
Taif Industrial City
Tabuk Industrial City
Jazan Industrial City
Industrial supplier in Saudi Arabia
Pipe fittings supplier in Jubail / Dammam / Riyadh
Flange and valve supplier Saudi Arabia
Fast delivery industrial materials KSA