Specifications

  • Alloy 255
  • CD3MCuN Grade 1C
  • 1.4507
  • Norsok MDS D56
  • UNS S32550 (Super Duplex S32550)
View Data Tables For This Product

Ferralium 255 – 3SC for Castings (UNS S32550)

Ferralium® 255 – 3SC is a super duplex stainless steel supplied in cast form. As a 25% Cr alloy, with significant additions of Cu, it offers excellent corrosion resistance in a wide variety of corrosive chemicals including sulphuric, nitric and phosphoric acid. When submerged in seawater and other bodies of liquid containing chloride, it also provides outstanding resistance to pitting and crevice corrosion, with a 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.

Sanmac alloys

Specifications

  • Alloy 255
  • CD3MCuN Grade 1C
  • 1.4507
  • Norsok MDS D56
  • UNS S32550 (Super Duplex S32550)
View Data Tables For This Product

Data Tables

Chemical Composition:

CrNiMoCoNb (+Ta)TiVWCuCMnNSiPSFeAl
Min24.005.502.701.000.14
Max26.007.503.902.000.0252.000.250.700.0350.010Balance

Mechanical Properties:

0.2% Proof Stress450 N/mm265.3 ksi
Tensile Strength700 N/mm2101.5 ksi
Elongation, 5.65√S0 and 4D25%
Reduction of Area
Hardness (Brinell)270 max
Impact Strength (Room Temp)70J51.6 ft.lb

Notes:

  1. Testing shall be carried out in accordance with ASTM A370 or EN ISO 6892-1 (tensile), EN ISO 6506-1 (hardness)
  2. Minimum properties quoted (tested at room temperature in a longitudinal direction)
  3. Testing performed on each melt of material per heat treatment batch
  4. ASTM G48A corrosion test (at 50°C) no pitting and < 0.8g/m2 weight loss
  5. Ferrite content  40-60%
  6. Microstructure certified free from grain boundary carbides, sigma, chi and laves phases

 

 

 

 

Physical Properties:

Density (Kg/m3)7810
Magnetic Permeability (20°C)33
Young’s Modulus (kN/mm2)199
Specific Electrical Resistance, 20°C (µΩ-m)0.8
Mean coefficient of thermal expansion, 20-100°C (m/m/degC)11.1 x 10-6
Specific Heat, 20°C (J/kg.K)475
Thermal conductivity, 20°C (W/m.K)14.2
Fracture Toughness, KQ (MPa/m2)98

Product Features

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