Alloy 400 is a nickel-copper single-phase alloy most commonly supplied in a hot worked and annealed condition. Although the grade can be tempered or cold worked to increase its properties, in its standard annealed condition, it is easy to form and fabricate with no requirements for additional heat treatments to re-balance the alloy. It retains excellent mechanical properties at sub-zero temperatures. Strength and hardness increase with only a slight loss of ductility and impact resistance.
Alloy 400 possesses excellent corrosion resistance to many reducing media. It can be used in contact with fluorine, hydrofluoric acid, hydrogen fluoride or their derivatives – its resistance to hydrofluoric acid has been demonstrated in all concentrations up to the boiling point. It is also resistant to many forms of sulfuric and hydrochloric acids under reducing conditions and it also performs well in seawater. Alloy 400 is also resistant to stress corrosion cracking and pitting in most fresh and industrial waters. It is therefore widely used in marine engineering, chemical and hydrocarbon processing equipment, valves, pumps, shafts, fittings, fasteners, and heat exchangers.
Specifications:
BS 3076 NA13
2.4360
ASTM A164
UNS N04400, N04405
QQ - N - 281
For enquiries about this product, call us on +44 (0)1782 610250
Retains excellent tensile strength and toughness down to cryogenic temperatures
Highly resistant to hydrofluoric acid, and resistant to sulphuric and hydrochloric acids under reducing conditions
Resistant to chloride stress corrosion, and exhibits very low corrosion rates in flowing seawater
ASME Approval for Pressure Vessel application
Applications:
Process industry applications in sulphuric acid, hydrochloric acid and fatty acid production, hydrofluoric & fluorosilicic acid processes
Marine industry and shipbuilding components such as propellers, shafts, fasteners
Oil & Gas industry pumps, valves, crude petroleum stills and process vessels
Heat exchanger plates
Electrical and electronic components
Boiler feedwater heaters, de-aerating heaters
Chemical Composition:
Cr
Ni
Mo
Co
Nb (+Ta)
Ti
V
W
Cu
C
Mn
N
Si
P
S
Fe
Al
Min
63.00
28.00
Max
34.00
0.30
2.00
0.50
0.024
2.50
Mechanical Properties:
Hot Worked & Annealed
Cold Worked & Stress Relieved
0.2% Proof Stress
172 N/mm2
24.9 ksi
483 - 690 N/mm2
70 – 100 ksi
1.0% Proof Stress
195 N/mm2
28.3 ksi
Tensile Strength
483 N/mm2
70 ksi
621 - 862 N/mm2
90 -125 ksi
Elongation, 5.65√S0 and 4D
35%
20%
Reduction of Area
60%
60%
Hardness
110 – 132 HBN
35 HRC max
Impact Strength (Room Temp)
160J av (150J min)
160J av (150J min)
Notes:
Testing shall be carried out in accordance with ASTM A370 or EN ISO 10002-1 (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
Physical Properties:
Density (Kg/m3)
8830
Magnetic Permeability (20°C)
Could show magnetism as Curie temperature is close to room temperature
Young’s Modulus (kN/mm2)
179
Specific Electrical Resistance, 20°C (µΩ-m)
0.51
Mean coefficient of thermal expansion, 20-100°C (m/m/degC)
14.1 x 10-6
Specific Heat, 20°C (J/kg.K)
419
Thermal conductivity, 20°C (W/m.K)
21.8
Curie Temperature (°C)
21 - 49
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