Alloy 400/400AR Stainless Steel

Alloy 400/400AR Stainless Steel

Alloy 400/400AR Stainless Steel General Properties Alloy 400 (UNS N04400) is a nickel-copper alloy with excellent resistance to a wide range of corrosive environments. It is resistant to chloride stress corrosion cracking and has high strength and toughness over a wide range of temperatures. The...
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Alloy 400/400AR Stainless Steel

General Properties

Alloy 400 (UNS N04400) is a nickel-copper alloy with excellent resistance to a wide range of corrosive environments. It is resistant to chloride stress corrosion cracking and has high strength and toughness over a wide range of temperatures.


The alloy is used extensively in many corrosive applications especially in the marine and chemical processing industries. Alloy 400 is readily fabricated by conventional processing operations.


Alloy 400AR is produced in the as-rolled condition to meet higher strength requirements.


Chemical Analysis

Weight % (all values are maximum unless a range is otherwise indicated)





Nickel (plus Cobalt)63.0 min.-70.0 max.Iron2.50
Copper28.0 min.-34.0 max.Sulfur0.024
Carbon0.3Silicon0.5
Manganese2.0


Physical Properties

Density

0.318 lbs/in3
8.80 g/cm3

Specific Heat

0.102 BTU/lb-°F (68°F)
427 J/kg-°K (20°C)

Modulus of Elasticity

26.4 x 103 ksi (68°F)
182 GPa (20°C)


Thermal Conductivity 200°F (100°C)

150 BTU/hr/ft2/ft/°F (68°F)
22.0 W/m-°K (20°C)

Melting Range

2370 – 2460°F
1300 – 1350°C

Electrical Resistivity

307 Microhm-in at 70°C

0.511 Microhm-cm at 21°C


Mean Linear Expansion

TemperatureMean Linear Expansiona

°F°Cin/in/°F x 10-6um/m•°C
-320-200
-300-1806.111.1
-200-1306.411.4
-100-706.712.1
7021
2001007.714.2
4002008.615.2
6003008.815.7
8004008.916.1
10005009.116.3
12006009.316.6
14007009.617.0
16008009.817.4
180090010.0b17.7
2000100010.3b18.1b

(a) annealed material, (b) extrapolated


Mechanical Properties

Nominal Room-Temperature Mechanical Properties of Alloy 400 and 400AR

FORM AND CONDITIONYield Strength
0.2% Offset
Tensile StrengthElongation, %Hardness


ksiMPaksiMPaBrinell
(3000-kg)
Rockwell
B


Plate






Hot-Rolled, As-Rolled40-75276-51775-95517-65545-30125-21570-96
Hot-Rolled, Annealed28-50193-34570-85482-58650-35110-14060-76


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