|
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Features
* Oxidation resistance to 2000~F
* Carburization resistance
* Resistant to dry C12 to about 1
000~F
* Virtually immune to chloride ion
stress corrosion cracking
* Good caustic corrosion resistance
Applications
* Heat treating muffles and retorts
* Bar frame heat treating baskets
* Chlorination equipment to 1000~F
* Pulp mill alkaline digesters
Nominal Chemical
Composition
|
element
|
weight %
|
|
Nickel
|
76
|
|
Chromium
|
15.5
|
|
Iron
|
8
|
|
Carbon
|
.08
|
|
Manganese
|
.3
|
|
Silicon
|
.2
|
Specifications
UNS N06600
ASTM B 168, B 166, B 167
ASME SB-168, SB-166, SB-167
AMS 5665
|
|
Performance Profile
RA600 is a nickel-base alloy with excellent
carburization, and good oxidation resistance at
elevated temperatures. The alloy has long been used
in the heat treating industry for many of the same
applications as RA330. RA600 has useful resistance
to dry CL2 and HCL gases at moderately elevated
temperatures. RA600 is not suggested for use at red
heat when sulfur is present. RA200 and RA201 nickel
are normally preferred for handling concentrated,
high temperature caustic. However, when sulfur
compounds are present as well, or for ammonium
hydroxide service, RA600 is suggested. RA600 is
subject to stress corrosion cracking in hot,
concentrated caustic alkalies. To avoid stress
corrosion cracking, the RA6OO fabrication should be
fully stress relieved prior to use. A minimum
treatment of 1650 °F 1 hour is suggested,
1800-1850 °F 1 hour preferred.
Static Corrosion in Molten
Caustic Soda
Corrosion Rate, Mils Per Year
|
|
400 °C
|
500 °C
|
580 °C
|
680 °C
|
|
Alloy
|
(750 °F)
|
(932 °F)
|
(1076 °F)
|
(1256 °F)
|
|
RA201
|
0.9
|
1.3
|
2.5
|
37.8
|
|
RA400
|
1.8
|
5.1
|
17.6
|
-
|
|
RA600
|
1.1
|
2.4
|
5.1
|
66.4
|
Mechanical Properties
Typical Room Temperature Property Range
|
Tensile Strength, psi
|
0.2% Yield Strength, psi
|
Elongation %
|
Hardness Brinell
|
|
80,000-105,000
|
35,000-50,000
|
30-55
|
130-180
|
Physical Properties
|
Density lb/in3
0.306
|
Melting Range °F
2470-2575
|
|
Temp °F
|
Coefficient* of Thermal Expansion,
in/in°F x 10-6
|
Thermal Conductivity
Btu•ft/ft2•hr•°F
|
Modulus of Elasticity Dynamic, psi
x 106
|
|
70
|
-
|
8.6
|
30
|
|
1000
|
8.4
|
13.2
|
25.6
|
|
1200
|
8.6
|
14.3
|
24.5
|
|
1400
|
8.9
|
15.5
|
23.6
|
|
1600
|
9.1
|
16.7
|
22.2
|
|
1800
|
9.3
|
-
|
20.4
|
* 70 °F to indicated temperature.
|