Certified Mechanical Properties.
Covers Stellite®6B in the form of sheet and plate up to 1 inch thickness and round bar up to 3.5” diameter.
Minimum Properties of Wrought Stellite® 6B
|
Property
|
Value
|
|
Tensile Strength
|
130 ksi (896 MPa)
|
MIN
|
|
Yield Strength at 0.2% offset
|
70 ksi (483 MPa)
|
MIN
|
|
Elongation in 4D
|
5%
|
MIN
|
|
Reduction in Area
|
7%
|
MIN
|
|
Hardness
|
33-43 HRC
|
|
Properties Data
The properties listed in this booklet are typical or average values based on laboratory tests conducted by the manufacturer. They are indicative only of the results obtained in such tests and should not be considered as guaranteed maximums or minimums. Materials must be tested under actual service conditions to determine their suitability for a particular purpose. All data represent the average of four or less tests unless otherwise noted. The secondary units (metric) used in this booklet are those of the SI system.
Chemical Composition, Percent
|
Stellite®
|
Cobalt
|
Nickel
|
Silicon
|
Iron
|
Manganese
|
Chromium
|
Molybdenum
|
Tungsten
|
Carbon
|
|
6B
|
Bal.
|
3.00*
|
2.00*
|
3.00*
|
2.00*
|
28.00-32.00
|
1.50*
|
3.50-5.50
|
0.90-1.40
|
|
6K
|
Bal.
|
3.00*
|
2.00*
|
3.00*
|
2.00*
|
28.00-32.00
|
1.50*
|
3.50-5.50
|
1.40-1.90
|
*Maximum
Average Physical Properties
|
Physical Properties
|
Temp., degrees C
|
Metric Units Stellite
6B 6K
|
Temp., degrees F
|
British Units Stellite
6B 6K
|
|
Hardness Limits
Typical
|
22
|
33-43 RC 40-42* RC
36-40 RC 43-47 RC
|
72
|
33-43 RC 40-42* RC
36-40 RC 43-47 RC
|
|
Density
|
22
|
Kg/m3
8387 8387
|
72
|
lb/in.3
0.303 0.303
|
|
Melting Range
|
|
1265 to 1354˚C
|
|
2310 to 2470 deg. F
|
|
Electrical Resistivity
|
22
|
microhm-m
0.91 -
|
72
|
microhm-m
36 -
|
|
Thermal Conductivity
|
22
|
watt-cm/sq. cm-deg. C
|
72
|
Btu-in/sq.ft.hr.-deg. F
103 -
|
|
|
|
0.147 -
|
|
(546 ohms per cil. mil. ft.)
|
|
|
|
x 10-6/m/m.K
|
|
microinches/in.-deg. F
|
|
|
0-100
|
13.9 13.8
|
32-212
|
7.7 7.7
|
|
|
0-200
|
14.1 13.8
|
32-392
|
7.8 7.7
|
|
|
0-300
|
14.5 13.8
|
32-572
|
8.0 7.7
|
|
|
0-400
|
14.7 13.8
|
32-752
|
8.2 7.7
|
|
Mean Coefficient of
|
0-500
|
15.0 13.8
|
32-932
|
8.3 7.7
|
|
Thermal Expansion
|
0-600
|
15.3 14.0
|
32-1112
|
8.5 7.8
|
|
|
0-700
|
15.8 14.2
|
32-1292
|
8.8 7.9
|
|
|
0-800
|
16.3 14.5
|
32-1472
|
9.1 8.1
|
|
|
0-900
|
16.9 14.9
|
32-1 652
|
9.4 8.3
|
|
|
0-1000
|
17.4 15.5
|
32-1832
|
9.7 8.6
|
|
Electrical Conductivity
|
|
|
|
|
|
Compared to Copper, percent
|
22
|
1.90 -
|
72
|
1.90 -
|
|
|
|
J/kg•K Room
|
|
Btu/lb-deg. F
|
|
Specific Heat (calculated)
|
Room
|
423 -
|
|
0.101 -
|
|
Magnetic Permeability at 200 Oersteds (15.900
|
22
|
<1.2 <1.2
|
72
|
<1.2 <1.2
|
|
A/m)
|
|
|
|
|
|
Reflecting Power, percent
|
|
57-70
|
|
57-70
|
*Minimum depending on gauge
Average Hot Hardness
|
Stellite®
|
Test Temp.,
deg. F (deg. C)
|
Brinell Hardness at Temperature,
Mutual Indentation Method
|
|
|
1000
|
(538)
|
226
|
|
|
1200
|
(649)
|
203
|
|
6B
|
1400
|
(760)
|
167
|
|
|
1600
|
(871)
|
102
|
Average Compressive Strength
|
Stellite®
|
Form
|
Test Temp.
|
Average Compressive Strength
Ksi (MPa)
|
|
6B
|
1/2-in. (12.7 mm), Plate 1
|
Room
|
347 (2392)
|
|
6K
|
Sheet 1
|
Room
|
325 (2241)
|
Average Modulus of Rupture
|
Stellite®
|
Form
|
Test Temp.
|
Average Modulus of Rupture
Ksi (MPa)
|
|
6B
|
Sheet 1
|
Room
|
338 (2360)
|
Average Modulus of Elasticity
|
Stellite®
|
Form
|
Test Temp.
|
Average Modulus of Elasticity
psi x 106 (MPa)
|
|
6B
|
Sheet 1
|
Room
|
30.4 (210,000)
|
|
6B
|
5/8-in. (15.9 mm), Bar
|
Room
|
31.1 (214,000)
|
Average Izod Impact Strength (un-notched)
|
Stellite®
|
Form
|
Test Temp.
|
Average Izod Impact Strength (un-notched) ft. lbs. J
|
|
6B
|
1/2-in (12.7 mm), Plate 1
|
Room
|
62 84
|
Average Charpy Impact Strength
|
Stellite®
|
Test Temp.,
deg. F (deg. C)
|
Type of Test
|
Average Charpy Impact Strength, ft. lbs. (J)
Longitudinal Transverse
|
|
|
|
Un-notched
|
72 (98)
|
65 (88)
|
|
|
Room
|
notched
|
6 (8)
|
-
|
|
|
1000 (538)
|
Un-notched
|
81 (110)
|
-
|
|
6B
|
|
notched
|
15 (20)
|
-
|
|
1/2-in. (12.7 mm), Plate 1
|
|
Un-notched
|
116 (157)
|
-
|
|
|
1250 (677)
|
notched
|
15 (20)
|
-
|
|
|
1500 (816)
|
Un-notched
notched
|
126 (171)
15 (20)
|
-
-
|
1 Solution heat-treated at 2250 deg. F (1232 deg. C), air cooled
Average Room Temperature Data - Stellite® 6B
|
FORM
|
Condition
|
Ultimate
Tensile Strength,
Ksi (MPa)
|
Yield Strength
at 0.2% offset
Ksi (MPa)
|
Elongation in 2 in.
50.8 mm, percent
|
Hardness,
Rockwell C
|
|
Sheet,
0.040 in. (1.0 mm), thick
|
Solution Heat-treated*
|
145.0 (1000)a
|
90.1 (621)a
|
12a
|
36a
|
|
Sheet,
0.065 in. (1.7 mm), thick
|
Solution Heat-treated*
|
140.8 (971)a
|
86.7 (598)a
|
11a
|
36a
|
|
Sheet,
0.125 in. (3.2 mm), thick
|
Solution Heat-treated*
|
144.7 (998)a
|
89.8 (619)a
|
11a
|
37a
|
|
Sheet,
0.187 in. (4.8 mm), thick
|
Solution Heat-treated*
|
144.5 (996)a
|
89.3 (616)a
|
10a
|
37a
|
Solution heat-treated at 2250 deg. F (1232 deg. C), air cooled
a Average of 27-31 tests
Average Tensile Data 1
|
Stellite®
|
Form
|
Test Temp.,
|
Ultimate Tensile
Strength
|
Yield Strength
at 0.2% offset,
|
Elongation in 2 in.
50.8 mm, percent
|
|
deg. F (deg. C)
|
Ksi
|
(MPa)
|
Ksi
|
(MPa)
|
|
|
|
Room
|
146.0
|
(1007)
|
91.6
|
(632)
|
11
|
|
|
|
1500
|
(816)
|
73.9
|
(509)
|
45.4
|
(313)
|
17
|
|
|
0.063 in. (1.6 mm),
|
1600
|
(871)
|
55.8
|
(385)
|
39.2
|
(270)
|
18
|
|
|
Sheet
|
1800
|
(982)
|
32.6
|
(225)
|
19.8
|
(137)
|
36
|
|
|
|
2000
|
(1093)
|
19.5
|
(134)
|
10.9
|
(75)
|
44
|
|
|
|
2100
|
(1149)
|
13.3
|
(92)
|
7.7
|
(53)
|
22
|
|
|
|
Room
|
148.0
|
(1020)
|
88.0
|
(607)
|
7
|
|
6B
|
1/2 in. (12.7 mm),
|
1000
|
(538)
|
133.0
|
(917)
|
58.5
|
(403)
|
9
|
|
|
Plate
|
1250
|
(677)
|
115.0
|
(793)
|
60.6
|
(418)
|
9
|
|
|
|
Room
|
154.1
|
(1063)
|
92.6
|
(638)
|
17*
|
|
|
|
600
|
(316)
|
147.8
|
(1019)
|
74.5
|
(514)
|
30*
|
|
|
5/8 in. (15.9 mm),
|
1000
|
(538)
|
129.1
|
(890)
|
67.3
|
(464)
|
28*
|
|
|
Bar
|
1500
|
(816)
|
75.4
|
(520)
|
46.5
|
(321)
|
28
|
|
|
|
1600
|
(871)
|
58.3
|
(402)
|
37.9
|
(261)
|
34*
|
|
|
|
Room
|
176.5
|
(1217)
|
102.7
|
(708)
|
4
|
|
|
|
1200
|
(649)
|
146.0
|
(1007)
|
-
|
-
|
8
|
|
6K
|
0.063 in. (1.6 mm),
|
1500
|
(816)
|
70.2
|
(484)
|
44.5
|
(307)
|
17
|
|
|
Sheet
|
1800
|
(982)
|
34.1
|
(235)
|
19.3
|
(133)
|
28
|
|
|
|
2000
|
(1093)
|
17.4
|
(120)
|
8.6
|
(59)
|
53
|
1 Solution heat-treated at 2250 deg. F (1232 deg. C), air cooled.
*Elongation, percent in 1 in. (25.4 mm).
Average Cavitation-Erosion Data
|
Alloy
|
Test Duration, hrs.
|
Weight loss, mg.
|
|
Stellite® 6B
Type 304 Stainless Steel
|
100
7
|
42.3
39.9
|
Average Abrasive Wear Data
|
Alloy
|
Condition
|
Volume Loss,
mm3
|
Hardness,
Rockwell
|
Wear
Coefficient1
|
|
Stellite® 6B
|
Mill annealed
|
8.2
|
C-38
|
0.471 x 10-3
|
|
Stellite® 6K
|
Mill annealed
|
13.3
|
C-46
|
0.946 x 10-3
|
|
Stellite® 25
|
Mill annealed
|
53.0
|
C-24
|
2.00 x 10-3
|
|
|
1 hr. at 1600 deg. F
|
|
|
|
|
|
(871 deg. C)
|
|
|
|
|
1090 Steel
|
water quenched +
|
37.2
|
C-55
|
8.00 x 10-3
|
|
|
4 min, at 900 deg. F
|
|
|
|
|
|
(482 deg. C)
|
|
|
|
|
Type 316
|
|
|
|
|
|
Stainless Steel
|
As received sheet
|
81.4
|
B-86
|
2.0 x 10-3
|
|
Type 304
|
|
|
|
|
|
Stainless Steel
|
As received sheet
|
102.1
|
B-92
|
3.00 x 1 0-3
|
Average Adhesive Wear Data*
|
Alloy
|
Condition
|
Ring Alloy
|
Volume Loss,
mm3
|
Wear
Coefficient1
|
|
Stellite® 6B
|
Mill annealed
|
4620 Steel
|
0.293
|
3.70 x 10-5
|
|
Stellite® 6K
|
Mill annealed
|
4620 Steel
|
0.561
|
8.73 x 10-5
|
|
Stellite® 25
|
Mill annealed
|
4620 Steel
|
0.285
|
2.50 x 10-5
|
|
|
1 hr. at 1600 deg. F
|
|
|
|
|
|
(871 deg. C)
|
|
|
|
|
1090 Steel
|
water quenched +
|
4620 Steel
|
0.293
|
6.00 x 10-5
|
|
|
4 min, at 900 deg. F
|
|
|
|
|
|
(482 deg. C)
|
|
|
|
Average Coefficients Of Static Friction For Some Common Materials
|
Material Against
|
Stellite® 6B
|
Cast Iron
|
Bronze
|
Aluminium
|
Lead
|
|
Stellite® 6B
|
0.119
|
0.123
|
0.125
|
0.138
|
0.119
|
|
Cast Iron
|
0.123
|
0.199
|
0.245
|
0.213
|
0.225
|
|
Bronze
|
0.125
|
0.245
|
0.231
|
0.257
|
0.249
|
|
Aluminium
|
0.138
|
0.213
|
0.257
|
0.213
|
0.328
|
|
Lead
|
0.119
|
0.225
|
0.249
|
0.328
|
0.290
|
Coefficient represents tangent of angle of repose. Tests made on dry surface having better than 120 grit finishes. All values based on averages and are to be used comparatively and not as absolute values.
* Average of two or more tests against a case-hardened SAE 4620 steel ring (Rockwell C-63).
1 The wear coefficient (K) was calculated using the equation where V = Wear volume (mm3)
P = Load (kg)
L = Sliding distance (mm)
h = Diamond pyramid hardness
A combination of a low wear coefficient and a high hardness is desirable for good wear resistance.
Average Corrosion Data - Stellite® 6B*
|
Media
|
Concentration,
percent by Weight
|
Test Temp.,
deg F (deg. C)
|
Average Penetration Rate per Year**
mils mm
|
|
Acetic Acid
|
10
|
Boiling
|
0.08
|
0.002
|
|
Acetic Acid
|
30
|
Boiling
|
0.04
|
0.001
|
|
Acetic Acid
|
50
|
Boiling
|
0.02
|
<0.001
|
|
Acetic Acid
|
70
|
Boiling
|
0.06
|
<0.002
|
|
Acetic Acid
|
99
|
Boiling
|
0.03
|
<0.001
|
|
Chromic Acid
|
10
|
150 (66)
|
95
|
2.41
|
|
Formic Acid
|
10
|
Boiling
|
20
|
0.51
|
|
Formic Acid
|
30
|
Boiling
|
26
|
0.66
|
|
Formic Acid
|
50
|
Boiling
|
47
|
1.19
|
|
Formic Acid
|
70
|
Boiling
|
50
|
1.27
|
|
Formic Acid
|
88
|
Boiling
|
23
|
0.58
|
|
Hydrochloric Acid
|
2
|
Room
|
0.1
|
<0.003
|
|
Hydrochloric Acid
|
5
|
Room
|
63
|
1.60
|
|
Hydrochloric Acid
|
10
|
Room
|
108
|
2.74
|
|
Hydrochloric Acid
|
20
|
Room
|
93
|
2.36
|
|
Hydrochloric Acid
|
2
|
150 (66)
|
0.1
|
<0.003
|
|
Hydrochloric Acid
|
5
|
150 (66)
|
>1000
|
>25.4
|
|
Hydrochloric Acid
|
10
|
150 (66)
|
>1000
|
>25.4
|
|
Hydrochloric Acid
|
20
|
150 (66)
|
>1000
|
>25.4
|
|
Nitric Acid
|
10
|
Boiling
|
0.15
|
<0.004
|
|
Nitric Acid
|
30
|
Boiling
|
6
|
0.15
|
|
Nitric Acid
|
50
|
Boiling
|
>1000
|
>25.4
|
|
Nitric Acid
|
70
|
Boiling
|
>1000
|
>25.4
|
|
Phosphoric Acid
|
10
|
Boiling
|
Nil
|
Nil
|
|
Phosphoric Acid
|
30
|
Boiling
|
2
|
0.05
|
|
Phosphoric Acid
|
50
|
Boiling
|
19
|
0.48
|
|
Phosphoric Acid
|
70
|
Boiling
|
23
|
0.58
|
|
Phosphoric Acid
|
85
|
Boiling
|
611
|
15.5
|
|
Sodium Hydroxide
|
30
|
Boiling
|
13
|
0.33
|
|
Sulfuric Acid
|
10
|
Room
|
0.02
|
<0.001
|
|
Sulfuric Acid
|
30
|
Room
|
Nil
|
Nil
|
|
Sulfuric Acid
|
50
|
Room
|
0.4
|
0.01
|
|
Sulfuric Acid
|
77
|
Room
|
0.7
|
0.02
|
|
Sulfuric Acid
|
10
|
150 (66)
|
0.02
|
<0.001
|
|
Sulfuric Acid
|
30
|
150 (66)
|
0.09
|
<0.003
|
|
Sulfuric Acid
|
50
|
150 (66)
|
>1000
|
>25.4
|
|
Sulfuric Acid
|
77
|
150 (66)
|
176
|
4.5
|
|
Sulfuric Acid
|
2
|
Boiling
|
31
|
0.79
|
|
Sulfuric Acid
|
5
|
Boiling
|
91
|
2.31
|
|
Sulfuric Acid
|
10
|
Boiling
|
157
|
3.99
|
|
Sulfuric Acid
|
20
|
Boiling
|
360
|
9.14
|
|
Sulfuric Acid
|
50
|
Boiling
|
>1000
|
>25.4
|
|
Sulfuric Acid
|
30
|
Boiling
|
>1000
|
>25.4
|
|
Sulfuric Acid
|
77
|
Boiling
|
>1000
|
>25.4
|
|
Ferric Chloride
|
10
|
Room
|
13
|
0.33***
|
|
(10 days without crevice)
|
|
|
|
|
|
Ferric Chloride
|
10
|
Room
|
9**
|
0.23***
|
|
(10 days with crevice bolt)
|
|
|
|
|
|
Ferric Chloride +
|
5
|
Room
|
18
|
0.46***
|
|
Sodium Chloride (10 days)
|
10
|
|
|
|
|
Potassium Permanganate +
|
2
|
194 (90)
|
8
|
0
.20
|
|
sodium Chloride (120 hrs)
|
2
|
|
|
|
* Determined in laboratory tests. It is recommended that samples be tested under actual plant conditions.
** Corrosion rates for all duplicate samples based on an average of 4-24 hour test periods.
*** Samples pitted during test.
Average Stress Rupture and Creep Data
|
Stellite®
|
Test Temp.,
deg. F (deg. C)
|
Stress
Ksi (MPa)
|
Initial
Elongation,
percent
|
Life, hrs.
|
Time in hours
for total Elongation, % of:
0.5 1.0 2.0
|
Elongation
at Rupture,
percent
|
|
|
1000
|
(538)
|
60
|
(414)
|
0.70
|
192.81
|
-
|
-
|
-
|
0.8
|
|
|
1200
|
(649)
|
50
|
(345)
|
0.45
|
361.4
|
0.5
|
113.8
|
-
|
3.0
|
|
6B
|
1400
|
(760)
|
35
|
(241)
|
0.35
|
59.3
|
0.4
|
3.8
|
16.3
|
5.1
|
|
0.063 in. (1.6
|
1500
|
(816)
|
25
|
(172)
|
0.35
|
70.6
|
0.2
|
4.3
|
19.9
|
4.7
|
|
mm),
|
1600
|
(871)
|
19
|
(131)
|
0.10
|
57.9
|
0.5
|
2.2
|
11.1
|
4.3
|
|
Sheet2
|
1700
|
(927)
|
12
|
(83)
|
0.19
|
104.0
|
1.8
|
20.9
|
89.9
|
2.6
|
|
|
1800
|
(982)
|
8
|
(55)
|
0.05
|
113.4
|
5.1
|
22.7
|
57.6
|
5.5
|
|
|
2000
|
(1093)
|
2
|
(14)
|
0.004
|
116.7
|
4.4
|
-
|
-
|
13.3
|
1 Test discontinued before rupture.
2 Specimens were solution heat-treated at 2250 deg. F (1232 deg. C) and air cooled prior to testing.
Fusion Welding
Stellite® 6B (AMS 5894) and Stellite® 6K can be welded by gas tungsten-arc (TIG) with an argon flow of 25 CFH, gas metal-arc (MIG), shielded metal-arc (coated electrode), and oxy-acetylene in this order of preference. The oxy-acetylene method should be used with discretion and care in that Stellite will “boil” during welding which may cause porosity. Use a 3x reducing flame to minimize oxidation, penetration, and inter-alloying.
Stellite® 6B (AMS 5894) and Stellite® 6K should be preheated and maintained at 1000°F (35 8°C) to prevent cracking during welding and then still air cooled. Fixturing which would chill the weld rapidly should not be used. Standard weld joints are recommended. Inconel® 82, 92, or 625 filler metals are recommended for joining Stellite® 6B (AMS 5894) to softer materials such as carbon steel or stainless steel, while the harder cobalt- base filler metals such as Stellite® 6 and Stellite® 21 are recommended for joining Stellite® 6B (AMS 5894) to itself, especially if wear resistance is required in the weld areas. In the latter case, Inconel® 82, 92, or 625 may be used for root passes and then be overlayed with the harder
materials. Gas shielding of the root side of the gas tungsten-arc weldments is not mandatory but is recommended in order to improve weld penetration.
Adequate ventilation is required to control exposure to airborne dust, fumes, and particulate when machining, grinding or welding Stellite alloys. MSDS sheets are available.
Brazing
Stellite® 6B (AMS 5894) and Stellite® 6K are readily joined to other materials by brazing. All forms of surface dirt such as paint, ink, oil, chemical residues, etc., must be removed from the mating parts by etching, solvent scrubbing, degreasing, or other means. In addition, fluxing will be required during torch brazing operations when using silver brazing filler metal to help clean the joint and allow the filler metal to flow more freely over the mating surfaces. Brush joining areas generously with brazing flux prior to heating. When torch or induction brazing, as soon as the brazing filler metal melts, the source of heat should be removed and the parts positioned. The assembly should then be pressed together to squeeze out the excess flux and still air cooled. The parts should not be quenched.
Other brazing filler metals (i.e., gold, palladium, or nickel-based alloys) are satisfactory for joining Stellite® 6B (AMS 5894) and Stellite® 6K. Brazing filler metal selection depends on the service conditions expected.
A close fit of the mating surfaces is recommended. The finished joints will have greater strength if the filler metal is very thin, generally 0.001 - 0.005” (0.03 - 0.13 mm) thick.
Brazing with high-temperature filler materials is generally performed in a furnace. Induction and resistance heating with salt-bath and
metal-bath dip brazing have limited application. Vacuum furnaces held at less than one micron pressure or controlled atmosphere furnaces, having adequate moisture control at brazing temperatures (less than 60° F ( 15°C) dew point), produce the most satisfactory results. Controlled atmospheres such as hydrogen or cracked ammonia are suitable for brazing Stellite® 6B (AMS 5894) and Stellite® 6K base materials.