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Features
* High design stresses for ASME Section
VIII applications to 1650 °F (899
°C)
* Seamless pipe and tube 5" O.D. and
under to 1800 °F (982 °C),
Section VIII
* Useful oxidation resistance through
1900 °F (1038 °C)
* Resistant to chloride ion stress
corrosion cracking
Applications
* Ethylene furnace quench boilers
* Reformer outlet pigtails and
manifolds
* Heat exchangers
* Pressure vessels
Nominal Chemical
Composition
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element
|
weight %
|
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Nickel
|
30.0 - 35.0
|
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Chromium
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19.0 - 23.0
|
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Manganese
|
1.5 max
|
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Silicon
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1.0 max
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Sulfur
|
0.015 max
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Copper
|
0.75 max
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Carbon
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0.06- 0.10
|
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Aluminum
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0.15- 0.60
|
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Titanium
|
0.15- 0.60
|
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Aluminum + Titanium
|
0.85- 1.20
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Iron
|
39.5 mm
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Specifications
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UNS N08811 N08810
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ASME
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ASTM
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SB-409
|
Plate, sheet and strip
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B 409
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SB-408
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Rod and bar
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B 408
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SB-407
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Seamless pipe and tube
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B 407
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Code Cases 1325, 1949, 1987,
and 1983
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For external pressure design use Fig.
NFN-9 of Section II Part D. RA800H/AT is P
No.45 ASME Section IX.
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Performance Profile
RA800H/AT is an austenitic heat resistant alloy
meant for high temperature structural applications.
The strength of RA8OOH/AT is achieved by controlled
levels of carbon, aluminum and titanium alone with
a 2100 °F (1149 °C) minimum anneal to
achieve grain size ASTMS or coarser.
Performance Profile
RA80OH/AT is commonly joined by RA 82 (ERNiCr-3)
bare wire for applications under 1450 °F (788
°C). RA330-04 (N08334) bare wire and
RA330-04-15 (W88334) covered electrodes offer a
close match of thermal expansion coefficients. For
applications 16000F (8710C) and higher RA333
(N06333) bare wire and RA333-07-1 6 covered
electrodes offer greater strength. To avoid
possible stress relaxation grain boundary cracking
of N0881 1 in applications above 1000 °F (538
°C) the welded fabrication may be heated 1650
°F (899 °C) for about one hour per inch
(25 mm) of thickness, 30 minutes minimum, air
cooled.
Mechanical Properties
Minimum Room Temperature Properties
|
Tensile Strength, psi
|
0.2% Yield Strength, psi
|
Elongation %
|
|
65,000
|
25,000
|
30
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Typical Creep-Rupture Strength
|
Temp °F
|
10,000 hr Rupture Strength,
psi
|
100,000 hr Rupture Strength,
psi
|
|
1400
|
7,300
|
5,300
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1500
|
3,500
|
1,200
|
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1600
|
1,200
|
800
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Physical Properties
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Density lb/in3
0.287
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Melting Range °F
2475-2525
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Temp °F
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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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6.7
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28.5
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1400
|
9.9
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13.8
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21.1
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1600
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10.2
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15.1
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19.2
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1800
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-
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17.8
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-
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* 70 °F to indicated temperature.
Further technical information for RA8OOH/AT is in
Bulletin #131.
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