Copper Alloys Beryllium Copper Alloy B25 UNS-C17200

 Product Data Sheet – Copper Alloys

Beryllium Copper Alloy B25  UNS-C17200

Chemical Composition

(% maximum, unless shown as range or minimum)

Copper(1) Aluminium Beryllium Cobalt(2) Silicon
Min / Max
Remainder
0.20
1.80 – 2.00
0.20 min
0.20
Nominal
98.1
1.90

(1) Copper value includes Silver

(2) Ni + Co, 20% min: Ni + Fe + Co, 0.6% max Ni +

Note: Copper + Sum of Named Elements, 99.5% min)

Applicable Specifications

Product Specification
AMS ASTM MILITARY SAE
Bar
4533, 4650, 4651
B194, B196
MIL-C-21657
J461, J463
Extrusions
B570
Forgings
4650
B570
Plate
B194
Rod
4533, 4651, 4534, 4650
B196
MIL-C-21657
J461, J463
Rod, Forging
4650
Sheet
B194
Strip
B194
J461, J463
Tube, Seamless
4535
B643
Wire
4725
B197
J461, J463

Common Fabrication Processes

Blanking, Drawing, Drilling, Forming and Bending, Tapping, Turning

Fabrication Properties

Joining Technique Suitability
Soldering
Good
Brazing
Good
Oxy-Acetylene Welding
Not Recommended
Gas Shielded Arc Welding
Good
Coated Metal Arc Welding
Good
Forgeability Rating
40
Joining Technique Suitability
Spot Weld
Good
Seam Weld
Fair
Butt Weld
Fair
Capacity for Being Cold Worked
Good
Capacity for Being Hot Formed
Excellent
Machinability Rating
20

Mechanical Properties

Typical Room Temperature 20°C

Temper
Former Temper
Section Size
Yield Strength
(0.2% offset)
Tensile Strength
Elongation
Rockwell Hardness
Vickers Hardness
(approx)
Fatigue Strength
@ 108 cycles
mm
MPa
MPa
%
B
C
F
30T
MPa
TB00
SHT
All
221
483
45
60
58
108
TD01
1/4 Hard
4.78
483
552
25
80
70
151
TD02
1/2 Hard
4.78
565
634
15
92
77
198
TD04
Hard
4.78
717
758
5
99
81
240
TF00
Precipitation Hardened
4.78
1,069
1,207
6
38
362
248
TH01
1/4 Hard + PHT
4.78
1,138
1,276
4
41
382
276
TH02
1/2 Hard + PHT
4.78
1,207
1,344
3
41
393
303
TH04
Hard + PHT
4.78
1,241
1,379
2
42
404
307
TM00
Mill Hardened
4.78
565
724
20
27
275
TM01
1/4 Hard (mill)
4.78
634
793
17
23
250
TM02
1/2 Hard (mill)
4.78
724
883
15
27
275
TM04
Hard (mill)
4.78
841
979
12
32
309
TM06
Extra Hard (mill)
4.78
1,020
1,158
7
37
353
TM08
Spring Hard (mill)
4.78
1,103
1,255
6
TB00
Annealed
138
496
20
65
117
TD04
SHT & Cold Worked: Hard (H)
9.53
517
758
8
95
214
TD04
25.4
517
745
8
95
214
TD04
76.2
517
710
8
94
209
TF00
SHT & Precipitation Hardened
76.2
896
1,255
3
TF00
All
1000
1,255
4
TH04
SHT, Cold Worked, PHT: Hard (H)
9.53
2,172
2,792
4
TH04
76.2
1000
1,344
4
TB00
SHT
193
469
35
TD01
SHT & Cold Worked: 1/4 Hard
565
703
10
TD02
SHT & Cold Worked: 1/2 Hard
689
841
5
TD03
SHT & Cold Worked: 3/4 Hard
827
979
2
TD04
SHT & Cold Worked: Hard
862
1,048
1
TF00
Precipitation Hardened
1,103
1,227
3
TH01
1/4 Hard & PHT (1/4HT)
1,207
1,310
2
TH02
1/2 Hard & PHT (1/2HT)
1,276
1,379
1
TH03
3/4 Hard & PHT (3/4HT)
1,310
1,448
1
TH04
Hard & PHT (HT)
1,344
1,462
1

PHT = Precipitation Heat Treated

SHT = Solution Heat Treated

Physical Properties

Property
Metric Units
Imperial Units
Melting Point (Liquidus)
982°C
1800°F
Melting Point (Solidus)
866°C
1590°F
Density
8.25 gm/cm³ @ 20°C
0.298 lb/in³ @ 68°F
Specific Gravity
8.26
8.26
Coefficient of Thermal Expansion
17.8 x 10 -6 / °C (20-300°C)
9.9 x 10 -6 / °F (68-392°F)
Themal Conductivity *
107.3 W/m. °K @ 20°C
62.0 BTU/ft²/ft/hr/°F @ 68°F
Thermal Capacity (Specific Heat)
418.64 J/kg. °K @ 293°K
0.1 BTU/lb/°F @ 68°F
Electrical Resistivity
7.68 microhm.cm @ 20°C
46.2 ohms (circ mil/ft) @ 68°F
Electrical Conductivity**
0.129 MegaSiemens/cm @ 20°C
22% IACS@ 68°F
Modulus of Elasticity (tension)
128,000 MPa
18,500ksi
Modulus of Rigidity (shear)
50,330 MPa
7,300 ksi

* Actual value is 62-75

** In the Precipitation Hardened Condition

Tempers Most Commonly Used

Flat Products
Bar, Drawn
H02, O60
Bar, Rolled
H02, O60
Plate
O60
Strip, Rolled
H01, H02, H03, H04, H10, O60
Other Products
Rod
H04, O60
Shapes
O60
Tube
H58, O60
Wire
H01, H02, H03, H04, O60

Typical Uses

Electrical – Electrical Switch and Relay Blades, Contact Bridges, Clips, Spring Connectors, Current Carrying, Relay Parts, Switch Parts, Fuse Clips, Navigational Instruments, Connectors, Belleville Washers

 

Fasteners – Bolts, Screws, Fasteners, Washers, Lock Washers, Roll Pins, Retaining Rings

 

Industrial – Diaphragms, Valve Stems, Flexible Metal Hose, Shafts, Springs, Electrochemical, Bourdon Tubes, Bellows, Wear Plates on Heavy Equipment, Springs, Welding Equipment, Rolling Mill Parts, Spline Shafts, Pump Parts, Valves, Pumps, Non Sparking Safety Tools, Valve Seats, Housings for Instruments, Bushings, Bearings

 

Ordnance – Firing Pins

 

Other – Tools (non sparking)

 

The technical advice and recommendations made in this Product Data Sheet should not be relied or acted upon without conducting your own further investigations, including corrosion exposure tests where needed. Please consult current editions of standards for design properties. Austral Wright Metals assumes no liability in connection with the information in this Product Data Sheet. Austral Wright Metals supplies a comprehensive range of stainless steels, copper alloys, nickel alloys and other high performance metals for challenging service conditions. Our engineers and metallurgists will be pleased to provide further data and applications advice.

 

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