Cobalt Alloy 25/ Haynes © Alloy 25/ Udimet L605/ Alloy L-605

 

HAYNES 25 (L605, Stellite 25, UNS R30605)


Ni 10.0, Cr 20.0, Mn 1.5, C 0.33, Si 0.40, Fe 3.00, S 0.030, Co Bal., P 0.040, W 15.00

 

High Performance Alloys stocks and produces HAYNES 25 (L605) in this grade in the following forms: Bar, wire spools, wire cuts, sheet/plate, strip, tube. 

 

Nominal Chemistry

The major alloying elements are as follows: Cobalt 50%, Chromium 20%, Tungsten 15% and Nickel 10%.

 

Features

  • Outstanding high temperature strength
  • Oxidation resistant to 1800° F
  • Galling resistant
  • Resistant to marine environments, acids and body fluids

Applications

  • Gas turbine engine combustion chambers and afterburners
  • High temperature ball bearings and bearing races
  • Springs
  • Heart valves

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Properties

HAYNES 25 (L605) is a non-magnetic cobalt based superalloy. HAYNES 25 (L605) maintains good strength upto 2150°F. AMS 5759 requires minimum yield strength of 45,000 psi at room temperature. HAYNES 25 (L605) maintains good oxidation resistance up to 1900° F. HAYNES 25 (L605) has a unique ability to resist corrosion in very severe environments. Highly resistant to hydrochloric acid, nitric acid and wet chlorine (subject to need for exercising care in its selection at certain con¬centrations and temperatures)

 

Hardenability

HAYNES 25 (L605) hardness is typically 250 BHN and never higher than 275 BHN by specification. Not significantly hardenable. Does not respond to customary aging treatments, but strain aging at relatively low temperatures (700-1100° F) can improve creep and rupture strength when the alloy is in service at temperatures under 1300° F. Also, tensile and creep strength can be improved by cold working. HAYNES 25 (L605) is an austenitic alloy.

 

Chemistry

Chemical Requirements

 

Ni

Cr

Mn

Si

Fe

S

Co

Max

11.00

21.00

2.00

0.40

3.00

0.030

Bal

Min

9.00

19.00

1.00

       

 

Tensile Data

Mechanical Property Requirements

 

Ultimate Tensile

Yield Strength (0.2% OS)

Elong. in 4D %

R/A

Hardness

Min

125 Ksi

45.0 KSi

30

   

Max

         

Min

862 Mpa

310 MPa

     

Max

         

 

 

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Specifications

Form

Standard

Metal Type

UNS R30605

Bar

AMS 5759 ASTM F90 GE B50T26A

Cold Worked Bars

MCI 1031 GPS 2051

Wire

 

Sheet

AMS 5537

Plate

AMS 5537

Foil

AMS 5537

Fitting

 

Welding Tube

GE B50T26A

Forging

AMS 5759

Weld Wire

AMS 5759

Weld Electrode

 

Din

2.4964

 

 

Performance Profile

Alloy L605 is the strongest of the formable cobalt alloys, useful for continuous service to 1800°F. Because of long and widespread use, this alloy has been the subject of many investigations to determine its properties over a wide range of conditions, thus making it an unusually well characterized material. Alloy L-605 is also known as alloy 25.

When exposed for prolonged periods at intermediate temperatures, alloy L-605 exhibits a loss of room temperature ductility in much the same fashion as other super alloys, such as X or 625.

Alloy L-605 is welded using gas tungsten arc, gas metal arc, shielded metal arc, electron beam and resistance welding. Submerged arc welding is not recommended. Use good joint fit-up, minimum restraint, low inter-pass temperature and cool rapidly from welding. For maximum ductility fabricated components should be annealed 2150-2250°F, rapid cool.

 

Corrosion Resistance

HAYNES 25 (L605) resistance to high temperature oxidation and carburization is good. The alloy, while not primarily intended for aqueous corrosion, is also resistant to corrosion by acids such as hydrochloric and nitric acid, as well as being resistant to wet chlorine solutions.

Density: 0.330 lbs./cubic inch

 

Machinability

RATING: 15% of B-1112
TYPICAL STOCK REMOVAL RATE: 25 surface feet/minute with high speed tools, 70 surface feet/minute with carbide.

COMMENTS:
All customary machining operations are easily performed. M40 series high-speed tools are customarily used. M2 alloy and carbide tools have limited application and are not recom¬mended for end milling, drilling or tapping. Sulphur chlorinated, water-based cutting fluids work successfully when machining this alloy

 

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COLD-WORKED PROPERTIES

Cobalt Alloy L605 has excellent strength and hardness characteristics in the cold-worked condition. These high property levels are also evident at elevated temperature, making Alloy L605 quite suitable for applications such as ball bearings and bearing races. A modest additional increase in hardness and strength can be achieved through aging of the cold-worked material.

TYPICAL TENSILE PROPERTIES, COLD-WORKED SHEET*

Cold
Reduction

Test
Temperature

Ultimate
Tensile Strength

0.2% Yield
Strength

Elongation
In 2 in. (51mm)
%

°F

°C

Ksi

MPa

Ksi

MPa

10

70
1000
1200
1400
1600
1800

20
540
650
760
870
980

155
114
115
87
62
39

1070
785
795
600
425
270

105
78
80
67
47
27

725
540
550
460
325
185

41
48
37
8
13
15

15

70
1000
1200
1400
1600
1800

20
540
650
760
870
980

166
134
129
104
70
40

1145
925
890
715
485
275

124
107
111
86
52
30

855
740
765
595
360
205

30
29
15
5
9
5

20

70
1000
1200
1400
1800

20
540
650
760
980

183
156
137
107
41

1260
1075
945
740
285

141
133
120
96
30

970
915
825
660
205

19
18
2
3
4

*Limited data for cold-rolled 0.050-inch (1.3 mm) thick sheet

 

 

TYPICAL HARDNESS AT 70°F (20°C), COLD-WORKED AND AGED SHEET*

Cold-Work
%

Hardness, Rockwell C, After Indicated Level of
Cold Work and Subsequent Aging Treatment

       

None

900°F(480°C)
5 Hours

1100°F (595°C)
5 Hours

       

None
5
10
15
20

24
31
37
40
44

25
33
39
44
44

25
31
39
43
47

       

*Limited data for cold-rolled 0.070-inch (1.8 mm) thick sheet.

 

 

TYPICAL TENSILE PROPETYPICAL TENSILE PROPERTIES, COLD-WORKED AND AGED SHEET*RTIES, COLD-WORKED SHEET*

Condition

Test
Temperature

Ultimate
Tensile Strength

0.2% Yield
Strength

Elongation
In 2 in. (51mm)
%

°F

°C

Ksi

MPa

Ksi

MPa

15% CW
+ Age A

70
1200

20
650

168
128

1160
885

136
104

940
715

31
23

20% CW
+ Age A

70
1000
1200
1400
1600
1800

20
540
650
760
870
980

181
151
144
108
74
43

1250
1040
995
745
510
295

152
129
128
97
59
33

1050
890
885
670
405
230

17
19
8
2
6
5

 

70
600
1000
1200
1400
1600
1800

20
315
540
650
760
870
980

191
165
149
140
116
71
42

1315
1140
1025
965
800
490
290

162
132
124
119
92
50
31

1115
910
855
820
635
345
215

19
28
23
13
7
9
12

*Limited data for cold-rolled 0.050-inch (1.3 mm) thick sheet.
Age A = 700°F (370°C)/1 hour
Age B = 1100°F (595°C)/2 hours

 

 

IMPACT STRENGTH PROPERTIES, PLATE.

Test
Temperature

Typical Charpy V-Notch
Impact Resistance

°F(°C)

Ft.-lbs.

Joules

-321 (-196)
-216 (-138)
-108 (-78)
-20 (-29)
Room
500 (260)
1000 (540)
1200 (650)
1400 (760)
1600 (870)
1800 (980)

109
134
156
179
193
219
201
170
143
120
106

148
182
212
243
262
297
273
230
194
163
144

 

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THERMAL STABILITY

When exposed for prolonged periods at intermediate temperatures, Cobalt Alloy L605 exhibits a loss of room temperature ductility in much the same fashion as some other solid-solution-strengthened super alloys, such as HASTELLOY® ALLOY X OR INCONEL® ALLOY 625. This behavior occurs as a consequence of the precipitation of deleterious phases. In the case of Alloy L605, the phase in question is CO2W laves phase. HAYNES alloy 188 is significantly better in this regard than Alloy L605.

ROOM-TEMPERATURE PROPERTIES OF SHEET AFTER THERMAL EXPOSURE*

Exposure
Temperature
°F(°C)

Hours

Ultimate
Tensile Strength

0.2% Yield
Strength

Elongation
%

Ksi

MPa

Ksi

MPa

None

0

135.0

930

66.8

460

48.7

1200 (650)

500
1000
2500

123.6
140.0
130.7

850
965
900

70.3
92.3
95.1

485
635
655

39.2
24.8
12.0

1400 (760)

100

115.3

795

68.9

475

18.1

1600 (870)

100
500
1000

113.6
126.1
142.0

785
870
980

72.1
77.3
81.7

495
535
565

9.1
3.5
5.0

*Composite of multiple sheet lot tests.

 

 

TYPICAL PHYSICAL PROPERTIES

 

Temp.,°F

British
Units

Temp.,°C

metric
Units

Density
Melting Range

Room

0.330

lb/in3

Room

1.93

G/cm3

2425-2570

 

 

1330-1410

 

 

Electrical
Resistivity

Room
200
400
600
800
1000
1200
1400
1600
1800

34.9
35.9
37.6
38.5
39.1
40.4
41.8
42.3
40.6
37.7

µohm-in
µohm-in
µohm-in
µohm-in
µohm-in
µohm-in
µohm-in
µohm-in
µohm-in
µohm-in

Room
100
200
300
400
500
600
700
800
900
1000

88.6
91.8
95.6
97.6
98.5
100.8
104.3
106.6
107.8
101.1
95.0

µohm-cm
µohm-cm
µohm-cm
µohm-cm
µohm-cm
µohm-cm
µohm-cm
µohm-cm
µohm-cm
µohm-cm
µohm-cm



Thermal
Conductivity

Room
200
400
600
800
1000
1200
1400
1600
1800

65
75
90
105
120
135
150
165
182
200

BTU-in/ft2 hr-°F 
BTU-in/ft2 hr-°F
BTU-in/ft2 hr-°F 
BTU-in/ft2 hr-°F 
BTU-in/ft2 hr-°F 
BTU-in/ft2 hr-°F 
BTU-in/ft2 hr-°F 
BTU-in/ft2 hr-°F 
BTU-in/ft2 hr-°F 
BTU-in/ft2 hr-°F

Room
100
200
300
400
500
600
700
800
900
1000

9.4
10.9
12.9
14.8
16.8
18.7
20.7
22.6
24.7
26.9
29.2

W/m-K
W/m-K
W/m-K
W/m-K
W/m-K
W/m-K
W/m-K
W/m-K
W/m-K
W/m-K
W/m-K

 

TYPICAL PHYSICAL PROPERTIES (continued)

 

Temp., ° F

British Units

Temp., ° C

Metric Units

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 microinches/in- ° F
7.2 microinches/in- ° F
7.6 microinches/in- ° F
7.8 microinches/in- ° F
8.0 microinches/in- ° F
8.2 microinches/in- ° F
8.6 microinches/in- ° F
9.1 microinches/in- ° F
9.4 microinches/in- ° F
9.8 microinches/in- ° F

25-100
25-200
25-300
25-400
25-500
25-600
25-700
25-800
25-900
25-1000
25-1100

12.3 µm/m- ° C
12.9 µm/m- ° C
13.6 µm/m- ° C
14.0 µm/m- ° C
14.3 µm/m- ° C
14.6 µm/m- ° C
15.1 µm/m- ° C
15.8µm/m- ° C
16.5 µm/m- ° C
17.0 µm/m- ° C
17.6 µm/m- ° C

 

 

DYNAMIC MODULUS OF ELASTICITY

Temp., ° F

Dynamic
Modulus of
Elasticity, 
10 6 psi

Temp., ° C

Dynamic
Modulus of
Elasticity,
GPa

Room
200
400
600
800
1000
1200
1400
1600
1800

32.6
32.3
31.0
29.4
28.3
26.9
25.8
24.3
22.8
21.4

Room
100
200
300
400
500
600
700
800
900
1000

225
222
214
204
197
188
181
174
163
154
146

 

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METAL-TO-METAL GALLING RESISTANCE

Cobalt Alloy L605 exhibits excellent resistance to metal galling. Wear results shown below were generated for standard matching material room-temperature pin on disc tests. Wear depths are given as a function of applied load. The results indicate that Alloy L605 is superior in galling resistance to many materials, and is surpassed only by ULTIMETTM alloy and HAYNES alloy 6B. Both of these materials were specifically designed to have excellent wear resistance.

 

Room-Temperature Wear Depth For Various Applied Loads

3,000 lbs. (1.365 Kg)

6,000 lbs. (2,725 Kg)

9,000 lbs. (4,090 Kg)

Material

mils

µm

mils

µm

mils

µm

alloy 6B

0.02

0.6

0.03

0.7

0.02

0.5

ULTIMET alloy

0.11

2.9

0.11

2.7

0.08

2.0

Alloy L605

0.23

5.9

0.17

4.2

0.17

4.2

Alloy 188

1.54

39.2

3.83

97.3

3.65

92.6

HR-160™ alloy

1.73

43.9

4.33

109.9

3.81

96.8

214™ alloy

2.32

59.0

3.96

100.5

5.55

141.0

556™ alloy

3.72

94.4

5.02

127.6

5.48

139.3

230™ alloy

4.44

112.7

7.71

195.8

8.48

215.5

HR-120™ alloy

6.15

156.2

7.05

179.0

10.01

254.2

 

HIGH-TEMPERATURE HARDNESS PROPERTIES

The following are results from standard vacuum furnace hot hardness tests. Values are given in originally measured DPC (Vickers) units and conversions to Rockwell C/B scale in parentheses.

 

 

Vickers Diamond Pyramid Hardness (Rockwell C/B Hardness)

70°F (20°C)

800°F (425°C)

1000°F (540°C)

1200°F (650°C)

1400°F ( 760°C)

Solution Treated

251 (RC22)

171 (RB87)

160 (RB83)

150 (RB80)

134 (RB74)

15% Cold Work

348 (RC22)

254 (RC23)

234 (RC97)

218 (RC95)

--

20% Cold Work

401 (RC35)

318 (RC32)

284 (RC27)

268 (RC25)

--

25% Cold Work

482 (RC48)

318 (RC32)

300 (RC30)

286 (RC28)

--

 

AQUEOUS CORROSION RESISTANCE

HAYNES 25 (L605) was not designed for resistance to corrosive aqueous media. Representative average corrosion data are given for comparison. For applications requiring corrosion resistance in aqueous environments, ULTIMET alloy and HASTELLOY® corrosion-resistant alloys should be considered.

 

Average corrosion Rate, mils per year (mm per year)

1% HCl (Boiling)

10% H2SO4 (Boiling)

65% HNO3(Boiling)

C-22™ alloy

3 (0.08)

12 (0.30)

134 (3.40)

Alloy L605

226 (5.74)

131 (3.33)

31 (0.79)

Type 316L

524 (13.31)

1868 (47.45)

9 (0.23)

 

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OXIDATION RESISTANCE

Cobalt Alloy L605 exhibits good resistance to both air and combustion gas oxidizing environments, and can be used for long-term continuous exposure at temperatures up to 1800°F (980°C). For exposures of short duration, Alloy L605 can be used at higher temperatures.

 

COMPARATIVE BURNER RIG OXIDATION RESISTANCE 1000-HOUR EXPOSURE AT 1800°F (980°C)

Metal
Loss

Average
Metal Affected

Maximum
Metal Affected

Material

mils

µm

mils

µm

mils

µm

230 alloy

0.8

20

2.8

71

3.5

89

HAYNES alloy 188

1.1

28

3.5

89

4.2

107

HASTELLOY® alloy X

2.7

69

5.6

142

6.4

153

Alloy 625

4.9

124

7.1

180

7.6

193

Alloy L605

6.2

157

8.3

211

8.7

221

Alloy 617

2.7

69

9.8

249

10.7

272

Alloy 800H

12.3

312

14.5

368

15.3

389

Type 310 Stainless Steel

13.7

348

16.2

411

16.5

419

Alloy 600

12.3

312

14.4

366

17.8

452

 

Oxidation Test Parameters

Burner rig oxidation tests were conducted by exposing samples 3/8 in. x 2.5 in. x thickness (9 mm x 64 mm x thickness), in a rotating holder, to products of combustion of No. 2 fuel oil burned at a ratio of air to fuel of about 50:1. (Gas velocity was about 0.3 mach). Samples were automatically removed from the gas stream every 30 minutes and fan-cooled to near ambient temperature and then reinserted into the flame tunnel.

 

COMPARATIVE OXIDATION RESISTANCE IN FLOWING AIR*

1800°F (980°C)

2000°F (1095°C)

2100°F (1150°C)

Material

mils

µm

mils

µm

mils

µm

HAYNES alloy 188

0.6

15

1.3

33

8.0

203

230 Alloy

0.7

18

1.3

33

3.4

86

Alloy L605

0.7

18

10.2

259

19.2

488

Alloy 625

0.7

18

4.8

122

18.2

462

Alloy X

0.9

23

2.7

69

5.8

147

Alloy 617

1.3

33

1.8

46

3.4

86

*Flowing air at a velocity of 7.0 ft./min. (213.4 cm/min.) past the samples. Samples cycled to room temperature once a week. 
**Metal Loss + Average Internal Penetration.

 

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Machining

  

The alloys described here work harden rapidly during machining and require more power to cut than do the plain carbon steels. The metal is ‘gummy,’ with chips that tend to be stringy and tough. Machine tools should be rigid and used to no more than 75% of their rated capacity. Both work piece and tool should be held rigidly; tool overhang should be minimized. Rigidity is particularly important when machining titanium, as titanium has a much lower modulus of elasticity than either steel or nickel alloys. Slender work pieces of titanium tend to deflect under tool pressures causing chatter, tool rubbing and tolerance problems.
Make sure that tools are always sharp. Change to sharpened tools at regular intervals rather than out of necessity. Titanium chips in particular tend to gall and weld to the tool cutting edges, speeding up tool wear and failure. Remember- cutting edges, particularly throw-away inserts, are expendable. Don't trade dollars in machine time for pennies in tool cost.

Feed rate should be high enough to ensure that the tool cutting edge is getting under the previous cut thus avoiding work-hardened zones. Slow speeds are generally required with heavy cuts. Sulfur chlorinated petroleum oil lubricants are suggested for all alloys but titanium. Such lubricants may be thinned with paraffin oil for finish cuts at higher speeds. The tool should not ride on the work piece as this will work harden the material and result in early tool dulling or breakage. Use an air jet directed on the tool when dry cutting, to significantly increase tool life.

Lubricants or cutting fluids for titanium should be carefully selected. Do not use fluids containing chlorine or other halogens (fluorine, bromine or iodine), in order to avoid risk of corrosion problems. The following speeds are for single point turning operations using high speed steel tools. This information is provided as a guide to relative machinability, higher speeds are used with carbide tooling.

Material

Speed
Surface ft/mm

Speed
%B1112

AISI B1112

165

100

Rne 41

12

7

25 (L-605)

15

9

188

15

9

N-155

20

12

Waspaloy

20

12

718

20

12

825

20

12

X

20

12

RA333

20-25

12-15

A-286

30

18

RA330

30-45

18-27

HR-120TM

30-50

18-30

Ti 6A1-4V
- soln annealed
- aged


30-40
15-45


18-30
9-27

RA 353 MA~

40-60

25-35

20Cb-3~

65

40

AL6xN~

65

40

RA309

70

42

RA310

70

42

304

75

45

321

75

45

446

75

45

Greek Ascoloy Annealed

90

55

Hardened Rc35

50

30

303

100

60

416

145

88

17-4 PH
- soln treated
- aged Hi 025


75
60


45
36

 

 

Availability:

 

 

 
 

L605 Plate

L605 Fittings

L605 Tube / Pipe

 

 

 

 

 

L605 Bar

L605 Sheet

L605 Coil /Strap

 

 

 

 

 

L605 Fasteners / Flanges

L605 Powder

L605 Welding Product

 

Specifications
UNS R30605
AMS 5507 Sheet Strip and Plate 
AMS 5759 Bar and Forging Stock
AMS 5796 Welding Wire
AMS 5797 (UNS W73605) Welding Rod
ASTM F90 Bar and Wire (surgical implant quality)
GE B50T26
GE B50A460 
Tradenames: Udimet Alloy L-605, Haynes 25, Nickelvac L-605

Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.

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