Type
Analysis
|
Element
|
Min
|
Max
|
|
Carbon
|
--
|
0.08 max
|
|
Manganese
|
--
|
2.00 max
|
|
Silicon
|
--
|
1.00 max
|
|
Chromium
|
13.50
|
16.00
|
|
Nickel
|
24.00
|
27.00
|
|
Molybdenum
|
1.00
|
1.75
|
|
Iron
|
--
|
Balance
|
|
Titanium
|
1.90
|
2.30
|
|
Vanadium
|
0.10
|
0.50
|
|
Aluminum
|
--
|
0.35 max
|
|
Boron
|
0.003
|
0.010
|
Description
Alloy A-286 is designed for
applications requiring high strength and good corrosion resistance at
temperatures up to 1300 °F(704 °C). This alloy offers high
ductility in notched sections. In fact, the notched rupture strength
of alloy A-286 is superior to many other commercial alloys with
comparable high temperature properties. An advantage of this alloy is
that it can be precipitation hardened and strengthened by heat
treatments. This makes possible a high degree of uniformity in
developing maximum strength, which can be duplicated application
after application.
Applications
Alloy A-286 has been used in jet
engines,superchargers and various high temperature applications such
as turbine wheels and blades,frames,casings,afterburner parts and
fasteners.
Corrosion
Resistance
The corrosion resistance of this
alloy is excellent up to 1300 °F(704 °C) against many
atmospheres encountered in jet engine service. Up to 1800 °F(982
°C), the oxidation resistance of alloy A-286 is equivalent to
that of Type 310 stainless.
Physical
|
Density
lb/cu in.................... 0.286
kg/cu m ...................... 7916
|
Melting range
°F................................. 2500/2600
°C................................. 1371/1427
|
Modulus of elasticity
|
Temperature
|
psi
x 10(6)
|
MPa
x 10(3)
|
|
Deg
F
|
Deg
C
|
|
70
|
21.1
|
28.8
|
199
|
|
1000
|
538
|
23.7
|
163
|
|
1100
|
593
|
22.8
|
157
|
|
1200
|
649
|
21.9
|
151
|
|
1300
|
704
|
21.1
|
145
|
|
1400
|
760
|
20.1
|
139
|
|
1500
|
816
|
18.7
|
129
|
|
Specific heat
Btu/lb-°F(104/1299 °F).......................... 0.110
kJ/kg-K(40/704 °C)................................ 0.461
|
Mean coefficient of thermal
expansion
|
Temperature
|
Coefficient
|
|
°F
|
°C
|
10-6/°F
|
10-6/°C
|
|
200
|
93
|
9.17
|
16.5
|
|
400
|
204
|
9.35
|
16.8
|
|
600
|
316
|
9.47
|
17.0
|
|
800
|
427
|
9.64
|
17.4
|
|
1000
|
538
|
9.78
|
17.6
|
|
1200
|
649
|
9.88
|
17.8
|
|
1300
|
704
|
9.94
|
17.9
|
|
1400
|
760
|
10.32
|
18.6
|
|
Thermal conductivity
Btu-in/ft(2)-hr-°F(302 °F)............... 104.2
W/m-k(150 °C)...................................15.0
Btu-in/ft(2)-hr-°F(112 °F)............... 165.0
W/m-k(600 °C)............................... 23.8
|
Magnetic permeability
Solution treated ...................................1.010
Solution treated and aged....................1.007
|
Workability
Hot Working/Forging
Alloy
A-286 is rolled or forged from temperature of 1900/2050 °F(1038/1121
°C) using a short soaking period. It is slightly more resistance
to deformation than the austentitic stainless steels during hot
working. Do not forge below 1700 °F(927 °C).
Cold Working
In the
solution treated condition,alloy A-286 can be satisfactorily cold
drawn and formed. It is somewhat stiffer than stainless steels such
as Types 316 and 310,and it work hardens rapidly.
Machinability
In general,
the high temperature alloys are more difficult to machine than
stainless steels. However, the iron-base alloy group, of which alloy
A-286 is a member, is easier to machine than the nickel-based
precipitation-hardening grades such as alloy 718 or cobalt-bearing
grades such as alloy 41. Carbide insert tools are commonly used where
possible.
The following charts contain machining information for
alloy A-286:
Turning-Single Point and Box Tools
|
Condition
|
Depth
of
Cut
In.
|
High
Speed Tools
|
Carbide
|
|
Speed
fpm
|
Feed
ipr
|
Tool
Mtl.
|
Speed
fpm
|
Feed
ipr
|
Tool
Mtl.
|
|
Brazed
|
Throw
Away
|
|
Solution
Treated
|
.100
.025
|
35
40
|
.015
.007
|
M-42
|
135
160
|
160
190
|
.015
.007
|
C-2
C-3
|
|
Aged
|
.100
.025
|
30
35
|
.010
.007
|
120
140
|
140
165
|
.010
.007
|
C-2
C-3
|
Turning_Cut-off and Form Tools
|
Condition
|
Speed
fpm
|
Feed,
ipr
|
Tool
Mtl.
|
|
Cutoff
Tool
Width, Inches
|
Form
Tool
Width, Inches
|
|
1/16
|
1/8
|
1/4
|
1/2
|
1
|
1-½
|
2
|
|
Solution
Treated
|
25
95
|
.002
.003
|
.004
.005
|
.005
.007
|
.003
.004
|
.002
.003
|
.002
.003
|
.001
.002
|
M-42
C-2
|
|
Aged
|
20
80
|
.002
.003
|
.004
.005
|
.005
.007
|
.003
.004
|
.002
.003
|
.002
.002
|
.001
.0015
|
M-42
C-2
|
Drilling
|
Condition
|
Speed
fpm
|
Feed,
ipr
|
Tool
Mtl.
|
|
Nominal
Hole Diameter, Inches
|
|
1/16
|
1/8
|
1/4
|
1/2
|
3/4
|
1
|
1-½
|
2
|
|
Solution
Treated
|
25
|
--
|
.002
|
.004
|
.006
|
.008
|
.010
|
--
|
--
|
M-42
|
|
Aged
|
20
|
--
|
.002
|
.004
|
.006
|
.008
|
.008
|
--
|
--
|
Reaming
|
Condition
|
High
Speed Tool
|
Carbide
Tool
|
|
Speed
fpm
|
Feed
Inches Per Rev
|
Tool
Mtl.
|
Speed
fpm
|
Tool
Mtl.
|
|
Reamer
Diam. Inches
|
|
1/8
|
1/4
|
1/2
|
1
|
1-½
|
2
|
|
Solution
Treated
|
30
|
.003
|
.006
|
.010
|
.012
|
.014
|
.016
|
M-42
|
100
|
C-2
|
|
Aged
|
25
|
.003
|
.006
|
.010
|
.012
|
.014
|
.016
|
M-42
|
80
|
Die Threading
|
Condition
|
Speed
fpm
|
Tool
Mtl.
|
|
7
or
Less
|
8
to
15
|
16
to
24
|
25
and up
T.P.I
|
|
Annealed
|
4-6
|
5-8
|
6-10
|
8-12
|
M-2;
M-7; M-10
|
|
Aged
|
3-4
|
3-5
|
4-8
|
5-10
|
M-42
|
Tapping
|
Condition
|
Speed
fpm
|
Tool
Mtl.
|
|
Solution
Treated
|
10
|
M-1;
M-7; M-10
|
|
Aged
|
7
|
M-1;
M-7; M-10; Nitrided
|
Milling--End-Peripheral
|
Condition
|
Depth
of
Cut In.
|
High
Speed Tools
|
Carbide
Tools
|
|
Speed
fpm
|
Feed-Inches
per tooth
|
Tool
Mtl.
|
Speed
fpm
|
Feed-Inches
per tooth
|
Tool
Mtl.
|
|
Cutter
Diam. inches
|
Cutter
Diam. inches
|
|
1/4
|
1/2
|
3/4
|
1-2
|
1/4
|
1/2
|
3/4
|
1-2
|
|
Solution
Treated
Aged
|
.050
|
30
20
|
.002
.002
|
.002
.002
|
.003
.003
|
.004
.004
|
M-42
|
120
80
|
.001
.001
|
.002
.002
|
.003
.003
|
.004
.004
|
C-2
|
Typical
Mechanical Properties
Tensile Properties
Tests
on 7/8"(22.2mm) diameter bar stock solution treated to 1800
°F(982 °C), 1 hour, oil quenched,aged 1325 °F(719 °C),
16 hours, air cooled.
|
Test
Temperature
|
0.02%
Offset
Yield Strength
|
0.2%
Offset
Yield Strength
|
Tensile
Strength
|
%
Elongation
in
2"
(50.8 mm)
|
%
Reduction
of
Area
|
|
°F
|
°C
|
ksi
|
MPa
|
ksi
|
MPa
|
ksi
|
MPa
|
|
70
|
21.1
|
90
|
621
|
95
|
655
|
145
|
1000
|
24.0
|
45.0
|
|
400
|
204
|
76
|
524
|
93.5
|
645
|
143
|
986
|
21.5
|
52.0
|
|
800
|
427
|
72
|
496
|
93
|
641
|
138
|
951
|
18.5
|
35.0
|
|
1000
|
538
|
62
|
427
|
87.5
|
603
|
131
|
903
|
18.5
|
31.0
|
|
1100
|
593
|
64.5
|
445
|
90
|
621
|
122
|
841
|
21.0
|
23.0
|
|
1200
|
649
|
62.5
|
431
|
88
|
607
|
103.5
|
714
|
13.0
|
14.5
|
|
1300
|
704
|
68.5
|
472
|
86
|
593
|
86.5
|
596
|
11.0
|
10.0
|
|
1400
|
760
|
44.5
|
307
|
62
|
427
|
64
|
441
|
18.5
|
23.0
|
|
1500
|
816
|
31
|
214
|
33
|
228
|
36.5
|
252
|
68.5
|
37.5
|
Note: Approximately 10
ksi higher strength and increased elongation may be obtained with
1650 °F(899 °C)solution treatment and 1325 °F(718 °C)
age.
Stress Rupture
Properties
Solution treated 1800 °F(982 °C), 1 hour,
oil quenched, aged 1325 °F(718 °C), 16 hours, air cooled.
|
Test
Temperature
|
Stress
for Rupture
|
|
°F
|
°C
|
100
Hours
|
%
Elongation
in
4D
|
1000
Hours
|
%
Elongation
in
4D
|
|
ksi
|
MPa
|
ksi
|
MPa
|
|
1000
|
538
|
99
|
683
|
3.0
|
88
|
607
|
3.0
|
|
1100
|
593
|
81.5
|
562
|
3.0
|
71.5
|
493
|
3.0
|
|
1200
|
649
|
61*
|
421
|
5.0
|
46***
|
317
|
8.5
|
|
1300
|
704
|
44.5
|
307
|
12.0
|
29
|
200
|
30.0
|
|
1350
|
732
|
35**
|
41
|
29.0
|
21
|
145
|
35.0
|
|
1500
|
816
|
13
|
90
|
55.0
|
7.7
|
53
|
----
|
Note:
Comparative values for 1650 °F(899 °C),1 hour,oil quenched
and 1325 °F(718 °C),16 hours,air cooled
*53ksi,**32
ksi,***39 ksi
|
