Type
Analysis
|
Element
|
Min
|
Max
|
|
Carbon
|
0.05
|
0.15
|
|
Nickel
|
9.00
|
11.0
|
|
Iron
|
--
|
3.00
|
|
Silicon
|
--
|
1.00
|
|
Manganese
|
1.00
|
2.00
|
|
Cobalt
|
Balance
|
|
Chromium
|
19.0
|
21.0
|
|
Tungsten
|
14.0
|
16.0
|
|
Phosphorus
|
--
|
0.03
|
|
Sulfur
|
--
|
0.03
|
Description
Haynes 25 is a cobalt-based alloy
which combines good formability and excellent high-temperature
properties. At 1800°F, Haynes 25 sheet has a 100 hour
stress-rupture strength of 7000 psi. The alloy is resistant to
oxidation and carburization to 1900°F.
Applications
Haynes 25 has given good service in
many jet engine parts. Some of these include turbine blades,
combustion chambers, afterburner parts, and turbine rings. The alloy
has also been used successfully in a variety of industrial furnace
applications including furnace muffles and liners in critical spots
in high temperature kilns.
Corrosion
Resistance
Haynes 25 (L-605) has displayed
excellent resistance to the hot corrosive atmospheres encountered in
certain jet engine operations. Resistance to oxidation is good for
intermittent service up to 1600°F and continuous service up to
2000°F.
Haynes 25 (L-605) is highly resistant to scaling and
oxidation at elevated temperatures, with particularly good qualities
under extreme oxidizing conditions.
This material also possesses
excellent resistance to chemical oxidizing agents, and extraordianry
resistance to hydrochloric and nitric acids at certain concentrations
and temperatures. Resistance to salt spray corrosion is very good.
Heat
Treatment
Solution Heat Treated for Best
Properties
For optimum properties, most wrought products are
shipped in the solution heat treated condition. This alloy is
normally solution heat treated in the temperature range of 2150 to
2250°F, and then either rapid air-cooled or water-quenched. Sheet
0.025" thick or less is solution heat treated at 2150°F,
rapid air cooled or water quenched.; over 0.026" and over, at
2200°F, rapid air cooled or water quenched; plate at 2200°F,
water quenched; and bar at 2250°F, water quenched.
Room and Elevated Temperature
Properties Enhanced by Cold Work and Aging
Cold working and
aging, when properly employed, improves both the room and elevated
temperature tensile strength of Haynes 25 sheet. Moderate amounts of
cold work will increase creep strength up to 1800°F and stress
rupture strength at temperatures up to 1500°F. Aging produces no
significant benefit. Strain aging, at 700 to 1100°F, however,
improves creep and rupture strength below 1300°F.
Physical
Properties
|
Physical
Properties
|
°F
|
British
Units
|
°C
|
Metric
Units
|
|
Density
|
72
|
0.330 lb./cu. in.
|
22
|
9.13 g/cu. cm.
|
|
Melting Range
|
2425-
2570
|
|
1329-
1410
|
|
|
Electrical
Resistivity
|
75
460
840
1200
1360
1500
1740
1830
1980
|
34.9
microhm-in.
38.1 microhm-in.
39.2 microhm-in.
41.8
microhm-in.
42.2 microhm-in.
42.4 microhm-in.
38.0
microhm-in.
37.5 microhm-in.
39.3 microhm-in.
|
24
238
449
649
738
816
949
999
1082
|
89 microhm-cm
97
microhm-cm
99 microhm-cm
106 microhm-cm
107
microhm-cm
108 microhm-cm
97 microhm-cm
95
microhm-cm
100 microhm-cm
|
|
Mean
Coefficient
of Thermal
Expansion
|
70-200
70-400
70-600
70-800
70-1000
70-1200
70-1400
70-1600
70-1800
70-2000
|
6.8
microin./in.-°F
7.2 microin./in.-°F
7.6
microin./in.-°F
7.8 microin./in.-°F
8.0
microin./in.-°F
8.2 microin./in.-°F
8.6
microin./in.-°F
9.1 microin./in.-°F
9.4
microin./in.-°F
9.8** microin./in.-°F
|
21-93
21-204
21-316
21-427
21-538
21-649
21-760
21-871
21-982
21-1093
|
12.3
microns/m.°C
12.9 microns/m.°C
13.5
microns/m.°C
13.9 microns/m.°C
14.4
microns/m.°C
14.8 microns/m.°C
15.4
microns/m.°C
16.2 microns/m.°C
16.9
microns/m.°C
17.7 microns/m.°C
|
|
Thermal
Conductivity
|
70
100
300
500
700
900
1100
1300
1500
1700
|
65**
Btu-in/ft²-hr-°F
67** Btu-in/ft²-hr-°F
82
Btu-in/ft²-hr-°F
97 Btu-in/ft²-hr-°F
112
Btu-in/ft²-hr-°F
127 Btu-in/ft²-hr-°F
142
Btu-in/ft²-hr-°F
157 Btu-in/ft²-hr-°F
172
Btu-in/ft²-hr-°F
191 Btu-in/ft²-hr-°F
|
20
100
200
300
400
500
600
700
800
900
|
0.098
watt-cm./cm.²-°C
0.112 watt-cm./cm.²-°C
0.130
watt-cm./cm.²-°C
0.147 watt-cm./cm.²-°C
0.166
watt-cm./cm.²-°C
0.185 watt-cm./cm.²-°C
0.204
watt-cm./cm.²-°C
0.224 watt-cm./cm.²-°C
0.244
watt-cm./cm.²-°C
0.265 watt-cm./cm.²-°C
|
|
Specific
Heat
(calculated)
|
80-212
|
0.092 Btu/lb-°F
|
28-100
|
0.092 cal./g.-°C
|
|
Magnetic
Permeability
(Room Temperature)
|
<1.0 at 116
oersteds
|
** Extrapolated
Dynamic Modulus of Elasticity
|
Form
|
Condition
|
Test
Temperature
°F
|
Dynamic
Modulus of
Elasticity, psi x 10(6)
|
|
Sheet
|
Solution
heat
treated
|
77
212
392
572
752
932
1112
1292
1472
1652
1832
|
32.6
32.2
31.0
29.6
28.6
27.3
26.3
25.2
23.7
22.4
21.2
|
Mechanical
Properties
|
Form
|
Condition
|
Test
Temperature
°F
|
Ultimate
Tensile
Strength,
ksi
|
Yield
Strength
at
0.2%
offset
psi
|
Elongation
in
2"
%
|
|
Sheet,
0.044-0.056"
|
Solution
heat
treated
|
Room
|
144.5*
130**
|
66.7*
55.0**
|
59*
45**
|
|
Sheet,
0.060-0.083"
|
Room
|
139.1*
130**
|
62.2*
55.0**
|
62*
45**
|
|
Sheet,
0.094-0.130"
|
Room
|
140.6*
130.0**
|
64.6*
55.0**
|
62*
45**
|
|
0.141 to Plate,
0.313"
|
Room
|
136.7*
|
63.0*
|
63*
|
|
Plate,
0.375-0.625
|
Room
|
142.6*
|
68.3*
|
56*
|
|
Plate, 0.750"
and up
|
Room
|
138.7*
|
65.8*
|
60*
|
* Average properties ** Guaranteed minimum properties
Typical Short-Time Tensile Data
|
Form
|
Condition
|
Test
Temperature
°F
|
Ultimate
Tensile
Strength,
ksi
|
Yield
Strength
at
0.2%
offset
psi
|
Elongation
in
2"
%
|
|
Sheet,
0.109"
thick
|
Solution
heat
treated
|
Room
600
1000
1200
1400
1600
1800
2000
2200
|
135.0
120.4
106.2
103.0
84.5
46.6
33.5
19.6
11.1
|
65.0
44.3
39.0
35.4
35.1
34.5
18.2
12.0
4.70
|
60
80
72
35
28
30
40
34
38
|
|
Plate
|
Solution
heat
treated
|
-321
-108
75
|
207.2
171.2
140.7
|
--
--
--
|
37
50
58
|
|
Bar,
1"
Diameter
|
Solution
heat
treated
|
Room
1000
1200
1350
1500
1650
1800
|
150.0
109.0
97.0
74.1
65.7
42.7
32.9
|
70.0
--
--
--
--
--
--
|
65*
71*
37*
36*
24*
24*
21*
|
|
Bar,
2.75-3.00"
Dia.
|
Solution
heat
treated
|
600
|
117.1
|
41.3
|
87
|
Average Rupture Data
|
Form
|
Condition
|
Test
Temperature
°F
|
Average
Initial Stress (ksi) for Rupture at:
|
|
10 hrs
|
100 hrs
|
1000 hrs
|
|
Sheet
|
Solution
heat
treated
|
1500
1600
1700
1800
2000
|
30,000
23,000
17,500
12,000
5,600
|
22,000
15,000
10,500
7,000
2,800
|
17,500
10,500
6,400
3,600
--
|
|
Bar
|
Solution
heat
treated
|
1350
1500
1600
1700
1800
2000
2100
|
42,500
30,000
23,000
17,000
11,500
6,000
3,600
|
36,500
22,000
16,500
12,000
7,500
3,300
1,700
|
30,300
17,000
12,000
8,400
5,000
1,800
--
|
Workability
Machinability
Haynes 25
(L-605) is machinable using conventional techniques; however, cobalt
grades of high-speed steel or carbide tools combined with rigid
machine setups are recommended.
Haynes 25 (L-605) is more
difficult to machine than the austenitic stainless steels (i.e. Types
302, 304, 321, and 347 stainless). Generally, lower feeds, speeds and
depths of cut are suggested. A very high work hardening rate,
generation of heat during cutting and high shear strength complicate
machining.
Welding
Haynes 25 can be
welded by shielded metal-arc, gas tungsten-arc (TIG) and gas
metal-arc (MIG) methods. Submerged-arc welding is not recommended
because this process is characterized by high heat-input to the base
metal and slow cooling of the weld. These factors can lower weld
ductility and promote cracking.
Cleaning
The joint surface
and adjacent area should be thoroughly cleaned down to bright metal
before welding. All grease, oil, crayon marks, and other foreign
matter should be removed by scrubbing with trichlorethylene or some
other suitable solvent. The surface should be wiped clean before
welding.
|
