HAYNES 25 (L605) TECHNICAL DATA


Type Analysis | Description | Application | Corrosion Resistance | Heat Treatment
Physical Properties | Mechanical Properties | Workability

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.

Haynes 25 (L-605) - Current Inventory Stock

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