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C18200 Chromium Copper Alloy

Electrical – Electrical Connectors, Electron Tube Grid Side Rods, Circuit Breaker Parts, Thermal Conductors Requiring Greater Strength than Copper, Cable, Electric Motor and Generator Components, Wire, High Temperature, Parts for Electronic Devices, Semi Conductor Bases, Contacts, Connectors, Switch Contacts, Electrical Conductors Requiring Greater Strength than Copper, Arcing and Bridging Parts, Switch Gears

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Product Introduction

(1) Copper value includes Silver

Note: Copper + Sum of Named Elements, 99.7% min)

Applicable Specifications

Product

Specification

Bar

MILITARY MIL-C-19311

Forgings

MILITARY MIL-C-19311

Rod

MILITARY MIL-C-19311

Strip

MILITARY MIL-C-19311

Wire, Soft

ASTM F9

Common Fabrication Processes

Bending, Cold Working, Drawing, Extruding, Forging, Heading, Hot Working, Impacting, Rolling, Swaging.

Fabrication Properties

Joining Technique Suitability

Joining Technique

Suitability

Soldering Good

Seam Weld

Not Recommended

Brazing Good

Butt Weld

Fair

Oxy-Acetylene Welding Not Recommended

Capacity for Being Cold Worked

Excellent

Gas Shielded Arc Welding Good

Capacity for Being Hot Formed

Good

Coated Metal Arc Welding Not Recommended

Forgeability Rating

80

Machinability Rating

20

Mechanical Properties

Typical Room Temperature 20°C

Temper

Section Size

Cold Work

Tensile Strength

Yield Strength

(0.5% ext. under load)

Elongation

Rockwell Hardness

Vickers Hardness

(approx)

mm

%

MPa

MPa

%

B

C

F

30T

Tube

TL03

5.4

76

476

434

26

84

162

Flat Products

TF00

1

0

352

248

22

59

77

TB00

1

0

234

131

40

16

138

Rod

TF00

51

0

483

448

18

75

138

TF00

12.7

0

483

379

21

70

134

TH04

12.7

60

531

448

16

82

156

TB00

12.7

0

310

97

40

TD10

3.96

91

510

503

5

Tube

TD04

5.4

76

407

393

21

67

130

Rod

TF00

25.4

0

496

448

18

80

150

TF00

102

0

379

296

25

68

130

Flat Products

TD00

1

50

365

352

6

66

128

Tube

O61

2.4

0

276

103

50

59

65

Flat Products

TH01

1

50

462

407

14

79

148

Rod

TF00

76

0

448

379

18

70

134

TD04

12.7

60

393

386

11

65

126

TH01

3.96

90

593

531

14

Plate

TF00

76

0

386

276

30

68

132

TF00

51

0

400

290

25

70

134

* Vickers Hardness is approximate – converted from Rockwell Hardness using ASTM E140 tables

Physical Properties

Property

Metric Units

Imperial Units

Melting Point (Liquidus)

1075°C

1967°F

Melting Point (Solidus)

1070°C

1958°F

Density

8.89 gm/cm³ @ 20°C

0.321 lb/in³ @ 68°F

Specific Gravity

8.89

8.89

Coefficient of Thermal Expansion

17.6 x 10 -6/ °C (20-300°C)

9.8 x 10 -6/ °F (68-392°F)

Themal Conductivity *

323.6 W/m. °K @ 20°C

187.0 BTU/ft²/ft/hr/°F @ 68°F

Thermal Capacity (Specific Heat)

385.5 J/kg/°K @ 293°K

0.092 Btu/lb/°F @ 68°F

Electrical Resistivity *

2.16 microhm-cm @ 20°C

13.0 ohms-cmil/ft @ 68°F

Electrical Conductivity *

0.468 MegaSiemens/cm @ 20°C

80% IACS@ 68°F

Modulus of Elasticity (tension)

117,000 MPa

17,000ksi

Modulus of Rigidity

49,640 MPa

7,200ksi

.* Solution heat treated, cold worked (50% minimum) and aged.

Typical Uses of Chromium Copper

Consumer – Pencil-type & Light Soldering Guns: Tips, Rod Extensions

Electrical – Electrical Connectors, Electron Tube Grid Side Rods, Circuit Breaker Parts, Thermal Conductors Requiring Greater Strength than Copper, Cable, Electric Motor and Generator Components, Wire, High Temperature, Parts for Electronic Devices, Semi Conductor Bases, Contacts, Connectors, Switch Contacts, Electrical Conductors Requiring Greater Strength than Copper, Arcing and Bridging Parts, Switch Gears

Industrial – Plastic Mold Components, Structural Parts, Spot Welding Tips, Flash Welding Electrodes, Molds, Electrode Holder Jaws, Flash Welding Electrodes, Seam Welding Wheels, Current Carrying Shafts and Arms, Heat Sinks, Resistance Welding Machine Electrodes, Wear Plates on Heavy Equipment.

RWMA (Resistance Welder Manufacturers Association) Chromium Copper

Electrode Material Standards

The mechanical and physical properties required of electrodes vary according to the application. The materials being used for electrodes fall into three groups:

• Group A — Copper Base Alloys.

• Group B — Refractory Metals and Refractory Metal Composites.

• Group C — Specialty Materials.

These groups are further subdivided as follows

GROUP A. Copper Base Alloys

RWMA Class 1. Specifically recommended, because of its high electrical and thermal conductivity for spot welding aluminum alloys, magnesium alloys, some coated materials, brass and bronze.

RWMA Class 2. Class 2 material has slightly lower conductivity and higher mechanical properties than Class 1. Class 2 are general purpose resistance welding electrode materials for production spot and seam welding of most materials. They are suitable for spot welding electrodes, projection welding electrodes, seam welding electrodes, shafts and bearings, flash welding electrodes and current-carrying structural members, and are also available as high strength and high electrical conductivity castings for use as welding platens and secondary circuit structural members. Class 2 material should be used in the heat-treated condition.

These materials are stronger than Class I materials, but have slightly lower conductivity. They are used for the spot and seam welding of cold and hot-rolled steel, stainless steel and low conductivity brass and bronze. They are also used as flash welding dies and as electrodes for the welding of galvanized steel and other coated materials.

RWMA Class 3. Class 3 material has lower conductivity and higher mechanical properties than Class 2. It is recommended for projection welding electrodes, flash and upset welding electrodes, current-carrying shafts and bushings. As castings, Class 3 material is recommended for highly stressed welding structural current-carrying members and heavy-duty offset electrode shanks and holders. It is recommended for spot welding and seam welding steels having high electrical resistance, such as stainless steels, and it should be used in the heat-treated condition.

Chromium Copper C18200 Extruded Rod

Specifications

Hardness

Electrical Conductivity

Tensile Strength

Minimum Yield Strength

Elongation

% IACS

MPa

MPa

%

RWMA Class 2 Group AASTM C18150ISO A2/2ASTM C18150ISO A2/2

75-83 HRB

134 – 156 HB

80 – 88

440 – 470

415

18 – 30

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