   | CuMg0,2 EN: CW127C UNS: C18661 |    |
CuMg0,2
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.
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
|
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
|
||||||
| UTS [MPa] | YS [MPa] | Elongation [%] | Hardness | Young’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%) |
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Strength properties of different Cu alloys (Cu-Mg alloy included) designed for trolley wires as a function of heating temperature for 1h heating time
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 .
Creeping curves for trolley wires (profile AC, according EN 50149) Progress of additional strain at RT (18°C) Load: F=11,25 kN
|
Technological properties
|
||||||||
| Melting temperature [°C] | Casting temperature [°C] | Castability | Annealling temperature [°C] | Homogenization temperature [°C] | Quenching temperature [°C] | Ageing temperature [°C] | Stress relievieng temperature [°C] | Hot working temperature [°C] |
| No data | No data | No data | 400-500 | No data | No data | No data | 140-180 160-200 | No data |
