|
|
Features
* Outstanding resistance to
carburization
* Resistant to combined carburization
and sulfidation
* Hot salt corrosion resistant
* Excellent thermal fatigue
resistance
* Resists metal dusting
* Good hot strength
* Good oxidation resistance
* Weldable with matching composition
filler metal
Applications
* Heat treating fixtures and bar frame
baskets
* Radiant tubes
* Fluidized bed coal combustion
systems
* Waste incinerators
* Coal burner nozzles
* Rotary kuns, calciners
* Salt pot fixturing
Nominal Chemical
Composition
|
element
|
weight %
|
|
Nickel
|
14.5
|
|
Chromium
|
18.5
|
|
Manganese
|
.8
|
|
Silicon
|
3.5
|
|
Aluminum
|
1.0
|
|
Carbon
|
.20
|
|
Iron
|
61
|
Specifications
UNS S30615
ASTM A 240
Pending - A 479, A 312, A 249
|
|
Performance Profile
RA85H is a fully austenitic heat resistant alloy
modified with high silicon and aluminum. RA85H is
annealed to provide good high temperature strength
combined with excellent resistance to thermal
fatigue.
The addition of silicon to RA85H provides
exceptional resistance to carburization. This
property is critical in a variety of applications
including heat treating and waste incineration.
RA85H is welded with matching composition RA85H
bare filler wire, or AC/CD covered electrodes. For
GMAW, use 100% argon or argonhelium shielding gas,
do not add oxygen.
Mechanical Properties
Representative Tensile Strength
|
Temp °F
|
Ultimate Tensile Strength,
psi
|
0.2% Yield Strength, psi
|
Elongation %
|
|
70
|
107,000
|
45,900
|
60
|
|
1000
|
84,800
|
30,600
|
56
|
|
1200
|
69,800
|
29,400
|
42
|
|
1400
|
39,300
|
28,600
|
80
|
|
1600
|
18,800
|
15,100
|
88
|
Typical Creep-Rupture Properties
|
Temp °F
|
Stress, psi, for a Secondary Creep
Rate 1% in 10,000 hrs
|
10,000 hr Rupture Strength,
psi
|
|
1400
|
-
|
5000
|
|
1600
|
2200
|
2100
|
|
1800
|
700
|
900
|
Physical Properties
|
Density lb/in3
|
Melting Range °F
|
|
0.274
|
2400-2520
|
|
Temp °F
|
Coefficient* of Thermal Expansion,
in/in°F x 10-6
|
Modulus of Thermal Conductivity
Btu•ft/ft2•hr•°F
|
Elasticity Dynamic, psi x
106
|
|
70
|
-
|
7.0
|
28.5
|
|
1000
|
9.9
|
-
|
22.5
|
|
1200
|
10.1
|
14.4
|
21.0
|
|
1400
|
10.3
|
15.9
|
19.5
|
|
1600
|
10.4
|
17.3
|
18.0
|
|
1800
|
10.7
|
-
|
-
|
* 70 °F to indicated temperature.
For additional information on RA85H request
Bulletin 1020.
Bulletin 208 covers fabrication practice in
detail.
|