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CuMg0,2
EN: CW127C
UNS: C18661
MANUFACTURERS LIST

Wires made of the copper-magnesium CuMg0,2 alloy belong to low-alloyed copper materials which are characterized by very good electrical conductivity as well as by excellent mechanical properties.

Compared to copper, CuMg0,2 in cold work-hardened condition is characterized by significant higher strength, essentially better softening performance and outstanding behavior under reversed bending stresses. CuMg0,2 offers good cold forming performance and fine drawability.

The reduction of the electrical conductivity of copper caused by magnesium is relatively small. The strengthening effect, however, is significant. In comparison to CuMg0,1, CuMg0,3 features higher strength with little lower electrical conductivity. Therefore, it is very suitable for contact wire and catenary cables for high-speed trains.

Magnesium is one of those elements reducing the electrical conductivity of copper only insignificantly. However, its strengthening effect is considerable. Within the copper – magnesium - alloy - family, CuMg0,1 has the highest electrical conductivity. Therefore, it is very suitable for the connection of electric components as well as for suspended cables.

Copper-magnesium is a solid solution alloy providing high strength with nominal reduction in conductivity relative to copper. CuMg0,1 combines high electrical conductivity with good tensile strength, excellent solderability and plate ability. Applications include connectors, semiconductor, pins, stranded wire, contact parts for the lighting industry, contact elements, telecommuncation cables, (car) wire harnesses, flat wire, special screws, pressed parts, rivets, catenary trolley cables and conductors.

Applications

Due to its physical properties this wire material is predestined to be used in automotive power systems, e.g. in terms of miniaturized cross sections of wiring harnesses. SF02 does not contain any cadmium and is characterized by high purity of its alloy components. As many other copper alloys produced by Sundwiger Messingwerk, SF02 is one of the “green materials“ and can be recycled easily.

Typical Applications - Conductive and connecting wire - Wiring harnesses - Semiconductor pins - Telecommunications cable - Telecommunications cord
Electrical: Terminal Connectors, Conductors, Terminals, Contacts, Wire, Catenary, Trolley Wire.

Availability:

Coating: Bare, Silver, Nickel, Tin, Gold

Temper: Soft or hard

Single end conductors, Stranded conductors, Bunched conductors, Concentric lay conductors

Single end size ≥ 0.025 mm (AWG 50), Other diameters or special constructions are available

Special applications:

-Automotive industry

The emphasis is more and more shifting towards environmental protection and husbanding of resources, with the focus revolving around the minimization of weight and consumption accompanied by heightened standards of safety and comfort. The growing use of electronic assistance systems constitutes a major step in this direction, which entails an increasing demand for signal cables. At the same time, the space accorded to cable harnesses is declining because of optimized safety systems. Signal cables made from LEONI Histral® H77 have the potential to render an important contribution to overcoming this predicament.

-Data cables / Signal cables

Its small alloy portion reduces the resistance value of  LEONI Histral® H77 no more than a little, as compared with pure copper. Thus, the very good electrical conductivity of the material remains unaffected whilst its excellent mechanical strength persists. This makes it a perfect fit for data cables and signal cables featuring very low diameters and cross-sections, but also a sufficient tensile strength.

Copper Magnesium has the highest tensile strength when compared to other alloys, making it the perfect alloy for contact wire in high speed lines with speeds well above 300 km/h. Together with the CuCd, it is the preferred alloy for the messenger cables, having the appropriate strength to carry the entire catenary system.

Chemical composition

Chemical composition
Value Comments
Cu [ wt.% ]99,59-99,9
Calculated
Mg [ wt.% ]0,1-0,3

P [ wt.% ]0,01
max.
Others [ wt.% ]0-0,1
max.

Chemical composition of SF02 Copper-Magnesium alloy from Diehl

Chemical composition, wt.%

Mg

P

Other

Cu

0,2

≤ 0,01

 ≤ 0,1

rest

Mechanical properties

Mechanical properties
UTS
[MPa]
YS
[MPa]
Elongation
[%]
HardnessYoung’s modulus
[GPa]
Kirchhoff’s modulus
[GPa]
Poisson ratio
230-800
Comments:
soft - hard
370
Comments:
min.
1-30
Comments:
Depends on temper
No data 120-125
Comments:
cold formed
No data No data

Mechanical properties of CuMg0,3

Nominal diameter, mm

Temper

Tensile strength, MPa

1,2-5,0

soft

360

1,0

hard

670

1,3

hard

640

1,5

hard

620

2,0

hard

580

2,5

hard

560

3,0

hard

540

3,5

hard

520

4,0

hard

510

5,0

hard

500

 

Comparison of the electrical and mechanical characteristics of some of copper alloys designed for trolley wires

Tensile strength comparison of trolley wires made from copper and copper alloys

Maximum resistance comparison of trolley wires made from copper and copper alloys

Maximum resistivity comparison of trolley wires made from copper and copper alloys

Tensile strength and electrical conductivity of selected copper alloys

Comparison of the electrical and mechanical characteristics and heat resistance of trolley wires made from different copper alloys

Material

Electrical conductivity, %IACS

Tensile strength, MPa

Elastic limit, MPa

Recrystallization temperature, °C

CuETP

99,5

370

356

220

CuAg0,1

98,7

370

360

340

EVELEC

87,2

405

374

380

CuMg0,2

77,8

440

432

410

CuMg0,5

60,5

500

440

420

Electrical conductivity as a function of tensile strength. Application of copper based alloys for trolley wire

Mechanical properties of CuMg0,1

Nominal diameter, mm

Temper

Tensile strength, MPa

1,2-5,0

soft

290

1,0

hard

500

1,3

hard

480

1,5

hard

470

2,0

hard

465

2,5

hard

420

3,0

hard

415

3,5

hard

405

4,0

hard

390

5,0

hard

380

Mechanical and electrical properties of FLCUMGRY cable

Cross-section

0,13 mm2

Tensile strength

>770 MPa

Electrical resistance, max.

170 Ω/km

Outer diameter

1,05 m

Approx. cable weight

2 kg/km



The tensile strength depends on the degree of cold-forming, and therefore, also on the diameter.

Mechanical and electrical properties of different copper alloys

Change of CuMg alloy conductivity and strength along with the Mg content

Properties of square wire made from different copper alloys, dimension: 0,63x0,63mm

Mechanical properties round & square wires as drawn, CuMg0,1

Temper

Tensile strength, MPa

Annealed

241-317

½ hard

379-482

Hard

517-620

Spring

Min. 620



Mechanical properties of CuMg0,1 and CuMg0,3 alloys (reference values, not standardized)

Highest tensile strength for diameter, MPa

CuMg0,1

CuMg0,3

Soft annealed

290

360

5

380

500

3,5

405

520

3,0

415

540

2,5

420

560

2,0

465

580

1,5

470

620

1,3

480

640

Mechanical properties of CuMg0,1, CuMg0,2 and CuMg0,3 alloys

Tensile strength, MPa

CuMg0,1

CuMg0,2

CuMg0,3

annealed

220-290

230-300

250-320

Hard

300-400

360-460

400-500

Spring hard

400-500

460-560

500-600

Super spring hard

500-700

560-800

600-820

Mechanical and electrical properties of CuMg0,2

Cross-section mm2

80

100

107

120

150

Min. tensile strength, MPa

460

450

440

430

420

Min. breaking load, KN

35,7

43,6

45,7

50,1

61,1

Elongation at break A200, %

3-10

3-10

3-10

3-10

3-10

Yield strength, MPa

>370

>370

>370

>370

>370

Electrical resistance, Ω/km

≤0,289

≤0,231

≤0,216

≤0,192

≤0,154

Trolley wires properties

Specifications

Trolley wires (according EN 50149), cross-sectional area, mm2

80

100

107

120

150

UTS, MPa

460

450

440

430

420

Breaking load, kN

35,7

43,6

45,7

50,1

61,1

Elongation, A200, %

3÷10

3÷10

3÷10

3÷10

3÷10

Young Modulus E, GPa

120

120

120

120

120

Yield stress, Rp0,2, MPa

>370

>370

>370

>370

>370

Half hard point, °C

≥385

≥385

≥385

≥385

≥385

Electrical conductivity, 20°C

≥44,6

≥44,6

≥44,6

≥44,6

≥44,6

Electrical coductivity, % IACS

≥77

≥77

≥77

≥77

≥77

Resistivity, 10-8 Ohm*m

≤2,240

≤2,240

≤2,240

≤2,240

≤2,240

Electric resistance, Ohm/km

≤0,289

≤0,231

≤0,216

≤0,192

≤0,154

Creep resistance, ‰ Temperature 150 °C, preload 100N per mm2, time 1000h

0,1

0,1

0,1

0,1

0,1

Thermal coefficient of electrical resistance, 10-3/K

1,85

1,85

1,85

1,85

1,85

Thermal expansion coefficient 20 … 300 °C, 10-5/K

1,7

1,7

1,7

1,7

1,7

Density, 103 kg/m3

8,89

8,89

8,89

8,89

8,89

Technical data of CuMg0,2 (VALCOND)

 

80

100

107

120

150

VALCOND

standard

VALCOND

standard

VALCOND

standard

VALCOND

standard

VALCOND

standard

Min. tensile strength 3)

MPa

460

460

450

450

450

440

450

430

430

420

Min. breaking load 1)

kN

36,0

35,7

44,1

43,6

43,6

45,7

52,9

50,1

63,2

61,1

Percentage elongation after fracture A200

%

3÷10

3÷10

3÷10

3÷10

3÷10

3÷10

3÷10

3÷10

3÷10

3÷10

Modulus of elasticity

GPa

120

120

120

120

120

120

120

120

120

120

0,2% proof strength Rp0,2

MPa

>370

>370

>370

>370

>370

>370

>370

>370

>370

>370

Half-Hard point

°C

>370

>385

>370

>385

>385

>385

>370

>385

>370

>385

Electrical conductivity at 20°C

MS/m

≥46,4

≥44,6

≥46,4

≥44,6

≥44,6

≥44,6

≥46,4

≥44,6

≥46,4

≥44,6

Electrical conductivity

%IACS

≥80

≥77

≥80

≥77

≥77

≥77

≥80

≥77

≥80

≥77

Specific electrical resistance at 20°C

10-8 Ωm

≤2,155

≤2,240

≤2,155

≤2,240

≤2,240

≤2,240

≤2,155

≤2,240

≤2,155

≤2,240

Electrical resistance 1)

Ω/km

≤0,275

≤0,389

≤0,22

≤0,231

≤0,231

≤0,216

≤0,183

≤0,192

≤0,147

≤0,154

Creepage elongation 2)

<0,1

<0,1

<0,1

<0,1

<0,1

<0,1

<0,1

<0,1

<0,1

<0,1

Temperature coefficient of electrical resistance 5)

10-3/K

3,1

1,85

3,1

1,85

1,85

1,85

3,1

3,1

3,1

1,85

Linear coefficient of thermal expansion

10-5/K

1,7

1,7

1,7

1,7

1,7

1,7

1,7

1,7

1,7

1,7

Specific mass 4)

103 kg/m3

8,89

8,89

8,89

8,89

8,89

8,89

8,89

8,89

8,89

8,89

1) Calculation based on the minimum cross section of 98% (EN 50149: 97%)
2) Temperature 150C; applied load 100N pro mm2; time 1000h
3) Different tensile strength on request 
4) According to EN 50149
5) Standard according to the nominal value of EN 50149, Valcond based on nkt-investigation

Exploitation properties

Strength properties of different Cu alloys (Cu-Mg alloy included) designed for trolley wires as a function of heating temperature for 1h heating time

NO DATA AVAILABLE

CuMg0,1-CuMg0,3 are resistant to hydrogen embrittlement

Type of corrosion

Suitability

Literature

Atmospheric

CuMg has a good resistance in in natural and industrial atmosphere

Marine environment

CuMg has a good resistance in maritime air.

Stress crack

Practically resistant against stress corrosion cracking

Hydrogen embrittlement

Resistant

Electrolytic

no data

 -

Other - oxidising acids

Not resistant

Resistant to atmospheric corrosion: formation of the a greenish protective patina due to the formation of copper basic salts (such sulphates, chlorides in marine environment, nitrates and carbonates). Industrial and drinking water, aqueous and alkaline solutions (not oxidizing), pure water vapour (steam), non-oxidizing acids (without oxygen in solution) and salts, neutral saline solutions. Not resistant to solutions containing cyanides, ammonia or halogens, hydrous ammonia and halogenated gases, hydrogen sulphide, seawater .

NO DATA AVAILABLE

Creeping curves for trolley wires (profile AC, according EN 50149) Progress of additional strain at RT (18°C) Load: F=11,25 kN

NO DATA AVAILABLE
NO DATA AVAILABLE
Fabrication properties

NO DATA AVAILABLE
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