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Features
* Oxidization resistance to 2000'F
* Moderate strength at high
temperature
* Ease of fabrication
* Good sulfidation resistance
* Good weldability
Applications
* Annealing covers and boxes
* Carbon saggers
* Waste incinerators
* Pulverized coal burners
* Brazing fixtures
* Salt pots
* Muffles, retorts
* Furnace fans and shafts
* Chemical plant equipment
* Radiant tubes for aluminum and steel
annealing
* Glass forming equipment
* Thermowells
* Paper mill equipment
* Power boiler tube hangers
* Kilns
* Anchor bolts
Nominal Chemical
Composition
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element
|
weight %
|
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Nickel
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13
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Chromium
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23
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Manganese
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1.6
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Silicon
|
0.8
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Carbon
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0.05
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Iron
|
60
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Specifications
UNS 830908
ASTM A 240, A 276, A 312
ASME SA-240, SA-479
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Performance Profile
RA309 is an austenitic heat resistant alloy with
oxidation resistance to 2000'F under constant
temperature conditions. When frequent thermal
cycling is involved, the alloy is resistant to
about 1850 °F. The high chromium and
relatively low nickel contents of RA309 confer good
resistance to high temperature sulfur bearing
atmospheres. RA309 has only moderate resistance to
carbon absorption and is not suggested for use in
highly carburizing atmospheres. Prolonged exposure
to the 1100-1600 °F temperature range will
cause some sigma to form, lowering room temperature
ductility and impact resistance. Should sigma
formation be anticipated, care should be taken to
avoid heavy mechanical impact at room temperature.
RA309 has a machinability rating of 43% relative to
AISI B1112 steel. Room temperature forming is
suggested. Weld with AWS E309-1 6 covered
electrodes or ER309 bare wire.
Mechanical Properties
Representative Tensile Properties
|
Temp °F
|
Ultimate Tensile Strength,
psi
|
0.2% Yield Strength, psi
|
Elongation %
|
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70
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90,000
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45,000
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50
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1200
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52,000
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22,000
|
26
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1600
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18,000
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-
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32
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Typical Creep-Rupture Properties
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Temp °F
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Stress, psi, for a Secondary Creep
Rate 1% in 10,000 hrs
|
10,000 hr Rupture Strength,
psi
|
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1200
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16,000
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17,000
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1400
|
3,400
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4,800
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1600
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1,400
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1,600
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1800
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220
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560
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Physical Properties
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Density lb/in3
0.285
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Melting Range °F
2500-2590
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Temp °F
|
Coefficient* of Thermal Expansion,
in/in°F x 10-6
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Thermal Conductivity
Btu•ft/fl2•hr•°F
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Modulus of Elasticity Dynamic, psi
x 106
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70
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-
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7.4
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28.5
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1000
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9.7
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11.5
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22.5
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1200
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-
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12.4
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21.0
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1400
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-
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-
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19.5
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1600
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10.1
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-
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18.0
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* 70 °F to indicated temperature.
For more detailed information on RA309, request
Bulletin 109.
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