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Features
* Oxidization resistance to 2000~F
* Moderate strength at high
temperature
* Resistance to hot corrosion
* Strength and toughness at cryogenic
temperatures
Applications
* Kuns
* Fluidized bed coal combustors
* Radiant tubes
* Tube hangers for petroleum refining
and steam boilers
* Coal gasifier internal components
* Lead pots, neutral salt pots
* Thermowells
* Refractory anchor bolts
* Burners, combustion chambers
* Retorts, muffles, annealing
covers
* Saggers
* Food processing equipment
* Cryogenic structures
Nominal Chemical
Composition
|
element
|
weight %
|
|
Nickel
|
20
|
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Chromium
|
25
|
|
Manganese
|
1.6
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Silicon
|
0.5
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Carbon
|
0.05
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Iron
|
52
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Specifications
UNS S31008
ASTM A 240, A 276, A 312
ASME SA-240, SA-479, SA-312
AMS 5521,5651
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Performance Profile
Excellent resistance to oxidation under mildly
cyclic conditions through 2000 °F
characterizes RA31 0. Because of its high chromium
and medium nickel contents, RA310 has good
resistance to sulfidation and other forms of hot
corrosion. RA310 is widely used in moderately
carburizing atmospheres such as encountered in
petrochemical environments. The more severely
carburizing atmospheres of industrial heat treating
furnaces require RA330, RA333 or RA85H. RA3l0 is
not suggested for the severe thermal shock of
repeated liquid quenching. RA310 is often used at
cryogenic temperatures, because of excellent
toughness to 4 °k, and low magnetic
permeability. RA310 has a machinability rating of
42% relative to AISI B1112 steel. With high speed
steel tooling this is about 70 surface feet per
minute. Forming operations should be at room
temperature whenever possible. Weld with matching
AWS E31 0-15 DC lime electrodes or ER310 bare
wire.
Mechanical Properties
Representative Tensile Properties
|
Temp °F
|
Ultimate Tensile Strength,
psi
|
0.2% Yield Strength, psi
|
Elongation %
|
|
70
|
80,000
|
35,000
|
52
|
|
1000
|
67,800
|
20,800
|
47
|
|
1200
|
54,100
|
20,700
|
43
|
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1400
|
35,100
|
19,300
|
46
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1600
|
19,100
|
12,200
|
48
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Typical Creep-Rupture Properties
|
Temp °F
|
Stress, psi, for a Secondary Creep
Rate % in 10,000 hrs
|
10,000 hr Rupture Strength,
psi
|
|
1200
|
14,900
|
14,400
|
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1400
|
3,300
|
4,500
|
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1600
|
1,100
|
1,500
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1800
|
280
|
660
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Physical Properties
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Density lb/in3
0.284
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Melting Range °F
2470-2555
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Temp °F
|
Coefficient* of Thermal Expansion,
in/in°F x 10-6
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Thermal Conductivity
Btu•ft/ft2•hr•°F
|
Modulus of Elasticity Dynamic, psi
x 106
|
|
70
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-
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7.6
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29.0
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1000
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9.5
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13.6
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23.0
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1200
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9.8
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152
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21.8
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1400
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10.05
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16.8
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20.5
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1600
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10.15
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18.4
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19.2
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1800
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10.3
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20.0
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2000
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10.6
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-
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-
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* 70 °F to indicated temperature.
For more detailed information on RA31 0, request
Bulletin 111.
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