Alloy 2205 is a 22% Cr duplex stainless steel, supplied in the solution annealed condition. As a duplex stainless steel, it combines the desirable aspect of properties of both austenitic and ferritic grades. The high chromium, molybdenum and nitrogen contents results in a Pitting Resistance Equivalent number (PREN) of 33-34, providing pitting and crevice corrosion resistance superior to Alloy 316L or Alloy 317L austenitic stainless steels in almost all corrosive media. Due to its excellent corrosion properties, it is well-suited to environments containing chlorides and hydrogen sulphide, for use in oil and gas extraction from sour wells, in refineries and in process solutions contaminated with chlorides.
It also has good erosion fatigue properties as well as lower thermal expansion and higher thermal conductivity than austenitic steels. The yield strength is about twice that of austenitic stainless steels, allowing a designer to save weight and make the alloy more cost competitive when compared to Alloy 316L or Alloy 317L.
Specifications:
1.4462
ASTM A479/A182
UNS S32205 Duplex F60
UNS S31803 Duplex F51
For enquiries about this product, call us on +44 (0)1782 610250
Marine industry and shipbuilding propellers, shafts, rudders, shaft seals, pumps, bolts, fasteners, valves, instrumentation
Oil and chemical tankers
Oil & Gas industry pumps, valves, pipe, vessels, wellhead equipment, subsea equipment, separators, heat exchangers
Pollution control systems, effluent scrubbing, flue gas desulphurisation (FGD)
Waste water treatment, sour water purification
Pulp & paper industry applications such as pulp liquor heaters, bleach tower linings, digesters, brownstock washers
Food industry applications including brewery piping, evaporators, hot liquor tanks, presses
Chemical Composition:
Cr
Ni
Mo
Co
Nb (+Ta)
Ti
V
W
Cu
C
Mn
N
Si
P
S
Fe
Al
Min
22.00
4.50
3.00
0.14
0.20
Max
23.00
6.50
3.50
0.03
0.20
0.70
0.03
0.02
Bal
Mechanical Properties:
0.2% Proof Stress
450 N/mm2
91.4ksi
Tensile Strength
655 N/mm2
123.3ksi
Elongation, 5.65√S0
25%
Reduction of area
45%
Hardness (Brinell)
<270
Impact Strength (Room Temp)
80J (av)
Impact Strength (-46°C) : Longitudinal
<100mm 80J
100-260mm 45J (35J min)
>260mm For info only
Impact Strength (-46oC) : Transverse
50-260mm 45J (35J min)
>260mm For info only
Notes:
Testing shall be carried out in accordance with ASTM A370 or EN ISO 6892-1 (tensile), EN ISO 6506-1 (hardness)
Minimum properties quoted (tested at room temperature in a longitudinal direction)
Testing performed on each melt of material per heat treatment batch
Hardness shall be in accordance with NACE MR 1075
ASTM G48A corrosion test (at 25°C) No pitting and < 3.0g/m2 weight loss
Ferrite content 40-55%
Microstructure certified free from grain boundary carbides, sigma, chi and laves phases
Physical Properties:
Density (Kg/m3)
7810
Magnetic Permeability (20°C)
<50
Young’s Modulus (kN/mm2)
190
Specific Electrical Resistance, 20°C (µΩ.m)
0.85
Mean coefficient of thermal expansion, 20-300°C (m/m/oC)
11 x 10-6
Specific Heat, 20°C (J/kg.K)
400
Thermal conductivity, 20°C (W/m.K)
15
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