|
|
Features
* Oxidation resistant to 2200
°F
* Resistant to carburization and
nitriding
* Resistant to thermal shock
* Good strength at elevated
temperature
* Metallurgical stability
* Chloride ion stress corrosion
cracking resistance
Applications
* Furnaces containers-carburizing,
carbonitriding, annealing
malleablizing
* Muffles, retorts
* Bar frame heat treating baskets
* Quenching fixtures
* Radiant tubes
* Salt pots, both neutral and
cyanide
* Furnace fans and shafts
* Conveyors
* Hot pressing platens
* Tube hangers for crude oil heaters
and steam boilers
Nominal Chemical
Composition
|
element
|
weight %
|
|
Nickel
|
35
|
|
Chromium
|
19
|
|
Manganese
|
1.5
|
|
Silicon
|
1.25
|
|
Carbon
|
0.05
|
|
Iron
|
43
|
Specifications
UNS N08330
ASTM B 536, B 511, B 512, B 535, B
546, B 710, B 739
ASME SB-536, SB-Si 1, SB-535,
SB-710
AMS 5592, 5716
|
|
Performance Profile
RA330 is the workhorse of the heat resistant
alloys. It has good strength, carburization and
oxidation resistance to about 2200~F. These
properties are enhanced by a nominal 1.25% silicon
addition. RA330 has been designed to withstand the
thermal shock of liquid quenching.
RA330 finds wide application in high temperature
industrial environments where good resistance to
the combined effects of carburization and thermal
cycling is a prime requisite. RA330 remains fully
austenitic at all temperatures and is not subject
to embrittlement from sigma formation.
RA330 is highly resistant to chloride ion stress
corrosion cracking and is a usetul engineering
choice for those applications where common
stainless has failed by stress corrosion.
RA330 is readily worked by forming and machining
procedures similar to those used with the
austenitic stainless steels or nickel-chromium
alloys. Forming at room temperature is suggested
whenever possible. Heat treatment is not necessary
after most forming or welding operations. When
required, the suggested full anneal is 1900-2050
°F, rapid air cool or water quench.
RA330 may be readily welded using RA330-04 weld
tillers of matching composition. Do not use AWS
ER330. keep interpass temperatures low, do not
preheat, do use reinforced stringer beads.
Machinability rating 20-25% of B1112.
Mechanical Properties
Typical Room Temperature
Properties:
|
Tensile Strength, psi
|
0.2% Yield Strength, psi
|
Elongation %
|
Hardness Rb
|
|
85,000
|
39,000
|
47
|
70-85
|
Typical Creep-Rupture Properties
|
Temp °F
|
Stress, psi, for a Minimum creep
Rate of 1% in 10,000 hrs
|
10,000 hr Rupture Strength,
psi
|
|
1400
|
3600
|
4300
|
|
1600
|
2100
|
1700
|
|
1800
|
500
|
630
|
Physical Properties
|
Temp °F
|
Coefficient* of Thermal Expansion,
in/in°F x 10-6
|
Modulus of Thermal Conductivity
Btu•fl/fl2•hr•°F
|
Elasticity Dynamic, psi x
106
|
|
70
|
-
|
7.2
|
28.5
|
|
1400
|
9.7
|
13.7
|
21.0
|
|
1600
|
9.8
|
14.2
|
19.5
|
|
1800
|
10.0
|
14.7
|
18.0
|
* 70 °F to indicated temperature.
Further technical information for RA330 is in
Bulletin 107.
Welding RA330 is covered in Bulletin 201.
|