ZYTC Alloy supplies Ferralium 255 (UNS S32550), a super duplex steel with 2% copper for superior acid & wear resistance. A cost-effective alternative to nickel alloys for marine, chemical, & oil & gas applications. Request a quote for bars, plates, & tubes.
Delivery :
FOB
minimum order :
50 kilograms
Supply Ability :
5000kilograms / Month
Stock Time :
7-10Day
Country of Origin :
CHINA
Quantity :
add to cart
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Ferralium 255 is a copper-alloyed super duplex stainless steel containing 2% copper—significantly more than other super duplex grades—providing enhanced resistance to sulfuric, nitric, and phosphoric acids. With 25% chromium and a PRE exceeding 38, this alloy combines high mechanical strength (yield strength ≥ 570 MPa) with excellent abrasion and cavitation resistance. It is widely specified for marine hardware, chemical processing equipment, and oil & gas components requiring superior performance in aggressive acidic environments .
1. Product Specifications & Physical Data
ZYTC Alloy supplies Ferralium 255 in comprehensive mill forms for marine, chemical processing, and industrial applications requiring verified corrosion resistance and mechanical properties.
Available Forms: Bar, rod, plate, sheet, pipe, and tube .
Specifications: UNS S32550, EN 10088-3 1.4507, ASTM A182, NACE MR0175/ISO 15156 .
Chemical Composition (Weight %)
Ferralium 255 Specification
Chromium (Cr)
24.5 - 26.5
Nickel (Ni)
5.5 - 6.5
Molybdenum (Mo)
3.1 - 3.8
Copper (Cu)
1.5 - 2.0
Nitrogen (N)
0.20 - 0.25
Manganese (Mn)
1.2 max.
Silicon (Si)
0.7 max.
Carbon (C)
0.025 max.
Phosphorus (P)
0.025 max.
Sulfur (S)
0.005 max.
Iron (Fe)
Balance
Physical Properties
Metric
Imperial
Density
7.8 g/cm³
0.281 lb/in³
Modulus of Elasticity
200 GPa
29.0 × 10⁶ psi
Thermal Conductivity
17 W/m·K
118 BTU·in/hr·ft²·°F
Coefficient of Expansion (20-100°C)
13.0 µm/m·°C
7.2 µin/in·°F
Mechanical Properties
Bar Size
Metric
Imperial
Yield Strength (0.2% offset)
≤ 100mm
586 MPa
85 ksi
Yield Strength (0.2% offset)
100-300mm
570 MPa
83 ksi
Tensile Strength (min.)
≤ 100mm
790 MPa
114.5 ksi
Elongation (min.)
All sizes
25%
25%
Hardness (Brinell)
All sizes
220-270
220-270
Impact Strength (-46°C)
All sizes
45 J
33 ft·lbf
2. Fabrication & Material Comparison
Heat Treatment: Solution anneal 1100-1150°C (2012-2102°F), water quench .
Welding: Good weldability with controlled heat input; matching filler metals recommended .
Machining: Higher cutting forces than austenitic grades; requires rigid setups and adequate coolant .
Material Comparison:
vs. Super Duplex 2507 (S32750): Higher copper content provides superior acid resistance; comparable strength and pitting resistance .
vs. Duplex 2205: Higher alloy content provides better acid resistance and strength .
vs. 904L: Superior strength; comparable acid resistance at lower cost .
vs. Alloy 20: Higher strength; similar acid resistance with better chloride resistance .
FGD Systems: Flue gas desulfurization equipment, scrubbers
Contact ZYTC Alloy for certified Ferralium 255 materials with complete traceability, ASTM specifications, technical datasheets, and competitive pricing on standard sizes or custom-fabricated components.
