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CuCr1Zr
EN: CW106C
UNS: C18150
MANUFACTURERS LIST
Aurubis
CuCrZr(LCZ1)
KM Europa Metal AG
CuCr1Zr(STOL95)
Luvata
CuCr1Zr
Wieland-Werke AG
CuCr1Zr(KA8)

CuCr1Zr is a precipitation hardening copper alloy. It has high mechanical and electrical properties. In the heat treated condition, this alloy retains the mechanical properties and good ductility within the temperature of 300-500oC.

Applications

Resistance welding tips, electrode caps for the automotive industry, tong arms for welding robots, electrode holders, press parts, overhead contact wires for electric railway, damper rings, damper finger segments. Literature:

Resistance welding tips and electrodes, parts for the energy engineering, damper finger segments, damper rings, connectors, rotors, contacts.

Chemical composition

Chemical composition
Value Comments
Cr [ wt.% ]0,5-1,2

Cu [ wt.% ]98,12-99,27
Calculated
Fe [ wt.% ]0-0,08

Si [ wt.% ]0-0,1

Zr [ wt.% ]0,03-0,3

Others [ wt.% ]0,2

Mechanical properties

Mechanical properties
UTS
[MPa]
YS
[MPa]
Elongation
[%]
HardnessYoung’s modulus
[GPa]
Kirchhoff’s modulus
[GPa]
Poisson ratio
200-640
60-570
8-30
152
Comments:
HB
128
49,2
Comments:
Calculated
0,3

Material's mechanical and electrical properties in different tempers

Temper

Tensile strength, MPa

Yield strength (min), MPa

Elongation (min) A50mm

Hardness

Literature

Extruded and drown rod 10-15mm

520

466

20

82 (Rockwell B)

152 (Brinell)

Extruded and drown rod 50-120mm

465

410

18

72 (Rockwell B)

125 (Brinell)

Extruded and drown rectangular and square bars

370-470

270-440

8-18 (A5)

125-155 (HB10)

72-83 Rockwell B

Welding electrodes (drown, forged)

 

 

 

100-140 (HV30)

Drawn rod and bar

455

425

19

75 Rockwell B

Round bar R200

min.200

60

min. 30 (A%)

 

Round and hexagonal bar  R440

min. 440

350

min. 10 (A%)

 

Round bar R470

min. 470

380

min. 8 (A%)

 

Square bar R420

min. 420

330

min. 12 (A%)

 

Cast C18100

min. 415

min. 345

25

 

TL02 wire 15,2mm diam

469

400

19

 

TL02 wire 17,8mm diam

469

338

15

 

TL04 wire 12,7mm diam

469

455

15

 

TL04 wire 15,2mm diam

469

434

20

 

Sheet, solution heat treated, artificially aged 3-100mm

370

270

12 (A10)

125 HB

DIN 17670-1

Sheet, solution heat treated, artificially aged 0.3-10mm

440

390

10 (A10)

145 HB

DIN 17670-1

Sheet, solution heat treated, strai-hardened 0.3-10mm

360

310

10 (A10)

115 HB

DIN 17670-1

Tubes, solution heat treated, artificially aged 1-10mm

370

270

18(A5)

125 HB

DIN 17670-1

Tubes, solution heat treated, strain-hardened, artificially aged 1-10mm

440

350

10 (A5)

145 HB

DIN 17670-1

Forging solution heat treated, artificially aged <315mm

410

290

10 (A5)

115 HB

DIN 17673-1,

Forging solution heat treated, artificially aged >315mm

340

270

15 (A5)

100 HB

DIN 17673-1

Forging solution heat treated, artificially aged

370

270

15 (A5)

125 HB

DIN 17674-1

Forging solution heat treated, artificially aged

440

370

10 (A5)

140 HB

DIN 17674-1

Effect of heat treatments on tensile properties of CuCrZr alloy at different temperature

Temper of CuCr1Zr

Test temperature, oC

Tensile strength, MPa

Yield strength (min), MPa

Uniform elongation eu (%)

Total elongation et (%)

Literature

The alloy was solution annealed at 960oC for 3 hours, water quenched and heat treated at 460oC for 3 hours PA

50

364-416

260-295

20-24

24-30

 

300

240-250

304-328

15-18

19-27

HT1:PA+600oC for 1 hour

50

318

200

26

30

300

227-255

150-180

17-19

21-24

HT2:PA+600oC for 4 hour

50

289-307

165-175

24-34

32-41

300

201-218

120-135

22-25

28-36

Solutionised at 1000oC for 1 hour water quenched and aged at 480oC for 5 hour

450

190

140

25

37

Solutionised at 950oC for 1 hour water quenched

20

277

98,4

 

36,9

100

239

72,7

 

45,8

150

230

83

 

42,8

200

211

78,7

 

39,7

250

207

75,4

 

42,1

300

204

69,6

 

41,9

350

220

66,7

 

32,6

400

249

141

 

35

500

166

139

 

28,4

550

109

106

 

18,7

600

140

131

 

18,5

650

67,3

64,4

 

23,9

700

68,5

64,9

 

43,5

Mechanical properties of CuCrZr alloys under different conditions

Variation of the relative density, hardness and electrical conductivity of the test materials as a function of process (C u-C r-Z r alloy synthesized with the powder metallurgy technique)

Electrical conductivity is strongly influenced by chemical composition. A high level of cold deformation and small grain size decrease the electrical conductivity moderately. Minimum conductivity level can be specified

Combinations of the electrical conductivity and tensile strength of the LNT-DPD and QSC-DPD CuCrZr alloys in comparison with that of the reported age-hardened CuCrZr alloys

True stress-true strain curves for the solutionised (at 1000°C for 1 hour and water quenched)  plus aged (at 480°C for 5 hour) - at room temperature (RT) and 450°C

Ultimate tensile strength (Su) and yield strength (Sy) of CuCrZr alloy in SAcwA condition and minimum tensile strengths. Data points are from the ITER MPH database. (Note:  SAcwA -solution annealing at 980–1000°C for 30–60 min, water quench, followed by cold working 40–70% and ageing at 450–470°C, for 2–4 h)

Ultimate tensile strength (Su) and yield strength (Sy) of CuCrZr alloy in SAA condition and minimum tensile strengths. Data points are from the ITER MPH database. (Note:  SAA - solution annealing at 980–1000°C for 30–60 min., water quench and age at 460–500°C for 2–4 h)

Temperature effect on the yield strength of Cu-Cr-Zr alloys

Resistivity vs. temperature plot for solutionised (1000°C for 1 hour and quenched Cu-Cr-Zr alloy (heating and cooling 2°C/min)

Thermal conductivity and specific heat of a CuCr1Zr alloy and pure copper.

Change in thermophysical properties (a-thermal conductivity, b- thermal expansion coefficient) with temperature of the Cu0.63Cr0.55Zr alloy

Thermal diffusivity vs. temperature of CuCrZr

Thermal conductivity of CuCrZr, Cu and Bronze

Effect of prior cold deformation and aging temperature on hardness and
electrical conductivity of Cu-Cr-Zr

Exploitation properties

Softening point: 480°C

Vickers hardness dependent on the annealing temperature for Cu0.4Cr0.12Zr0.02Si0.05Mg drawn to η = 6.0 (true strain). Time of annealing 1 h.

Heat flow difference of two consecutive runs at 20 °C/min for Cu0.4Cr0.12Zr0.02Si0.05Mg drawn to η = 6.0.

The measured flow stress dependent on the annealing temperature for Cu0.4Cr0.12Zr0.02Si0.05Mg. Time of annealing 1 h.

Resistivity and dislocation density dependent on annealing temperature for the tested Cu0.4Cr0.12Zr0.02Si0.05Mg Time of annealing 1 h.

Hardness at 20°C as a function of annealing temperature (1 hour) of as-extruded alloys (Cu0.2Zr - ZA-2, Cu0.37Zr - ZA-3, Cu0.8Zr - ZA-8 and Cu0.32Cr0.1Zr - ZAC-1).

Tensile strength vs. temperature of annealing for CuCrZr

Engineering stress–strain curves of cu-cr-zr alloy at room temperature, 200°C, 300°C, 400°C, 500°C, 600°C

The tensile strength and the elongation of Cu-Cr-Zr alloys at different temperatures

The hardness of Cu-Cr-Zr alloys at different temperatures

After short time heat treatment Vickers Hardness is measured

Room temperature hardness as a function of annealing temperature. Material at hard (aged) temper

NO DATA AVAILABLE

Corrosion parameters of Cu1.4Cr0.12Zr, in the solutions at various pH without and with NaCl.

Reaction

Without NaCl

0,6 M NaCl

OCP, V

Icorr, µA/cm2

Epit, V

Ipass, µA/cm2

OCP, V

Icorr, µA/cm2

Epit, V

Ipass, µA/cm2

pH1

-0,11

0,046

-

-

-0,29

2,025

-

-

pH3

-0,05

0,084

-

-

-0,27

0,420

-

-

pH5

0,05

0,034

-

-

-0,23

0,139

-

-

pH7

-0,05

0,039

0,18

-

-0,19

0,043

-

-

pH10

-0,04

0,058

0,25

1,7

-0,21

0,121

-

-

pH12

-0,12

0,131

0,50

10,0

-0,24

0,129

0,53

20

Plot of OCP vs time (a) and potentiodynamic polarization curves (b) of various copper-based alloys in 3.5% NaCl at 23°C.
(Note: Cu: hard-drawn, Copper alloys- age hardened) .

Weight-loss of specimens exposed in NaCl solution atmosphere of Cu0.36Cr, Cu, Cu0.36Cr0.11Zr , CuZr0.15, (Note: NaCl atmospheric corrosion test in salt spray chamber (in salt mist of 50 g NaCl/l) in the temperature of 35°C, in accordance with ISO 3768-1976 standard) .

Type of corrosion

Suitability

Literature

Atmospheric

Good

Marine environment

Good

Stress crack

No data

 -

Hydrogen embrittlement

Good

Electrolytic

No data

-

Other

No data

 -

NO DATA AVAILABLE

Creep strength in time function of CuCrZr alloy for different temperatures

Ultimate elongation in time function of CuCrZr alloy for different temperatures

Stress-rupture plot for CuCr0,32Zr0,1 at 400°C and 650°C - powder metallurgical alloy

Steady-state thermal creep laws for copper alloys

Creep strain from test data and creep laws for Cu-Ni-Be, Cu-Cr- Zr and Cu-Ag-P

Stress relaxation is tested with cantilever bending test equipment. This method is taking short time relaxation into account. So that the values achieved are very realistic, while other test methods like tube test pretend better properties from the achieved values. Relaxation values give an indication about stress relieve of strip under tension for a certain time and temperature. As it is measured on plain strip. The behaviour of deformed parts may differ. Nevertheless the ratio between the different tempers remains the same. Typical test sample thickness is 0.3 – 0.6 mm .

Wear mass loss of the CuCrZr alloy pins with sliding distance at electrical current of 30 A 
(Note: Examinations of the influence of the heat treatment parameters of the CuCrZr alloy on abrasion in conditions of current passage were carried out on supersaturated rods that have been previously hold at the temperature of 920°C for 0.5 hour. Next, it was subject to aging for 2 hours within the temperatures of 420 – 540°C and cooled in the air. Examinations were performed on a pin-on-disk wear tester with the CuCrZr alloy pin rubbin against a brass disk (Vickers hardness 83, 45mm diameter and 10 mm thickness).  Abrasion examinations were performed at the velocity of 14 m/s and loading of 20 N (pressure: 0.2 MPa). Passing current value was between 0 to 30 A at the voltage og 70 V. Samples surfaces were polished (before abrasion) with abrasive paper with its gradation value of 800 .

Wear mass loss of the brass disk rubbing against the CuCr1Zr alloy pins with sliding distance at electrical current of 30 A .

Plots of cumulative volume loss vs time for copper and its alloys under 20 N at (a) 0 A, (b) 30 A and (c) 50 A. (Note: Cu-wire cold drawn, copper alloys – age hardened.  Examinations were performed by pin-on-disc tribometer. The negative sample was the S30400 disc made of stainless steel. Examinations were carried out in an air atmosphere with the velocity of 31 km/h and under loading of 10 – 20 N on a roll sample at the diameter of 13 mm and length of 13 mm) .

Plots of cumulative volume loss vs time for copper and its alloys under load of (a) 10 N and (b) 15 N at 50 A. (Note: Cu-wire cold drawn, copper alloys – age hardened).  Examinations were performed by pin-on-disc tribometer. The negative sample was the S30400 disc made of stainless steel. Examinations were carried out in an air atmosphere with the velocity of 31 km/h and under loading of 10 – 20 N on a roll sample at the diameter of 13 mm and length of 13 mm) .

Sliding wear resistance for copper and its alloys under 20 N with and without current. (Note: Cu-wire cold drawn, copper alloys – age hardened.  Examinations were performed by pin-on-disc tribometer. The negative sample was the S30400 disc made of stainless steel. Examinations were carried out in an air atmosphere with the velocity of 31 km/h and under loading of 10 – 20 N on a roll sample at the diameter of 13 mm and length of 13 mm) .

Sliding wear resistance vs. hardness for various alloys under 20 N with and without current. (Note: Cu-wire cold drawn, copper alloys – age hardened.  Examinations were performed by pin-on-disc tribometer. The negative sample was the S30400 disc made of stainless steel. Examinations were carried out in an air atmosphere with the velocity of 31 km/h and under loading of 10 – 20 N on a roll sample at the diameter of 13 mm and length of 13 mm) .

Plots of wear rate vs load for copper and its alloys at (a) 0 A, (b) 30 A and (c) 50 A. (Note: Cu-wire cold drawn, copper alloys – age hardened.  Examinations were performed by pin-on-disc tribometer. The negative sample was the S30400 disc made of stainless steel. Examinations were carried out in an air atmosphere with the velocity of 31 km/h and under loading of 10 – 20 N on a roll sample at the diameter of 13 mm and length of 13 mm) .

Plots of wear rate vs current for copper and its alloys under (a) 10 N, (b) 15 N and (c) 20 N. (Note: Cu-wire cold drawn, copper alloys – age hardened.  Examinations were performed by pin-on-disc tribometer. The negative sample was the S30400 disc made of stainless steel. Examinations were carried out in an air atmosphere with the velocity of 31 km/h and under loading of 10 – 20 N on a roll sample at the diameter of 13 mm and length of 13 mm) .

Variation of number of cycles to failure with stress amplitude determined using load controlled creep-fatigue tests carried out at 295 K and 573 K with different holdtimes on prime aged (PA) CuCrZr. (Note: The alloy was solution annealed at 960°C for 3 hours, water quenched and heat treated at 460°C for 3 hours PA, HT1:PA+600°C for 1 hour, HT2:PA+600°C for 4 hour)

Variation of number of cycles to failure with stress amplitude determined using load controlled creep-fatigue tests carried out at 295 K and 573 K with different holdtimes for the overaged (HT1) CuCrZr alloy. (Note: The alloy was solution annealed at 960°C for 3 hours, water quenched and heat treated at 460°C for 3 hours PA, HT1:PA+600°C for 1 hour, HT2:PA+600°C for 4 hour) .

Variation of number of cycles to failure with stress amplitude determined using load controlled creep-fatigue tests carried out at 295 K and 573 K with different holdtimes for the overaged (HT2) CuCrZr alloy. (Note: The alloy was solution annealed at 960°C for 3 hours, water quenched and heat treated at 460°C for 3 hours PA, HT1:PA+600°C for 1 hour, HT2:PA+600°C for 4 hour) .

Temperature effect on the fatigue lifetime of Cu-Cr-Zr

Stress amplitude vs. number of cycles to failure of Cu-Cr-Zr alloys in comparison with conventionally produced Cu-based tempers

NO DATA AVAILABLE
Fabrication properties

Fabrication properties
Value Literature Comments
SolderingGood


BrazingFair


Hot dip tinningGood


Electrolytic tinningGood


Electrolytic silveringGood


Electrolytic nickel coatingGood


Oxyacetylene WeldingNot recommended


Gas Shielded Arc WeldingFair


Coated Metal Arc WeldingFair


Resistance weldingFair


Capacity for Being Cold WorkedGood


Capacity for Being Hot FormedGood


Machinability Rating20


Influence of aging on the properties of CuCrZr alloy water quenched: hardness (a), electrical conductivity (b), YS (c), UTS (d), TE (e) and RA (f).
(Solution annealing at 950°C for 30 min)

Influence of aging on the properties of CuCrZr alloy air cooled: hardness (a), electrical conductivity (b), YS (c), UTS (d) TE (e) and RA (f).
(Solution annealing at 950°C for 30 min)

Variation of hardness and electrical conductivity of the CuCrZr alloy with aging temperature.
(sample was solution treated at 920°C for 0,5 hour )

Electrical conductivity (IACS %) values of CuCrZr according to ageing temperature and period. (Note: CuCrZr alloy samples were quenched after holding at the temperature of 920°C for 1 hour in an argon atmosphere. Such samples were aged within the temperatures range of 470-530°C within the time limits of 1, 2 and 3 hours and then cooled

Aging temperature, oC

Aging time, h

Electrical conductivity, %IACS

470

1

68,7

470

2

72

470

3

76,5

500

1

72,26

500

2

75,26

500

3

80,79

530

1

77,03

530

2

79,6

530

3

89

Influence of D1 and D2 and ageing parameters of CuCrZr on Rm. a. 400°C for 6 h, b. 450°C for 6 h, c. 450°C for 3 h and d. 500°C for 3 h. (Note: Supersaturated feed was deformed at the deformation level of 10% - 50% (D1) and aged within the temperatures range of 400-500°C in time limits of 3 to 6 hours. Next, it was drawn with deformation of 10-50% (D2) onto the final diameter of 2 mm)

Influence of D1 and D2 and ageing parameters of CuCrZr on A200. a. 400°C for 6 h, b. 450°C for 6 h, c. 450°C for 3 h and d. 500°C for 3 h. (Note: Supersaturated feed was deformed at the deformation level of 10% - 50% (D1) and aged within the temperatures range of 400-500°C in time limits of 3 to 6 hours. Next, it was drawn with deformation of 10-50% (D2) onto the final diameter of 2 mm)

Influence of D1 and D2 and ageing parameters of CuCrZr on electrical conductivity (IACS). a. 400°C for 6 h, b. 450°C for 6 h, c. 450°C for 3 h and d. 500°C for 3 h. (Note: Supersaturated feed was deformed at the deformation level of 10% - 50% (D1) and aged within the temperatures range of 400-500°C in time limits of 3 to 6 hours. Next, it was drawn with deformation of 10-50% (D2) onto the final diameter of 2 mm)

The effect of aging temperature on the yield strength of the CuCrZr alloy cooled with different cooling rates: tested at (a) room temperature and (b) 250℃ .

Vickers microhardness HV (a) and electric conductivity (b) of ultrafine grain Cu-Cr-Zr alloys as a function of aging temperature (aging time is of 1 h)

Aging temperature effect on: (a) the hardness and (b) conductivity of the 80% cold rolled Cu–Cr–Zr–Ce alloy

Cold deformation effect on: (a) the hardness and (b) conductivity of the Cu–Cr–Zr–Ce alloy aged at 300 °C

Variation of hardness and electrical conductivity of aged samples as a function of aging temperature
and aging time

Bending test according to EN ISO 7438 is done with 10 mm wide samples. Smaller samples in general – as well as lower thickness – allow a lower bending radius without cracks. If needed we supply bending optimized temper classes that far exceed standard quality. Please take care when comparing with ASTM E 290 results, there the bend definition direction is contradictory

Microhardness of the ribbon after aged at various temperatures for different time

Conductivity of the ribbon after aged at various temperatures for different time

Technological properties

Technological properties
Melting temperature
[°C]
Casting temperature
[°C]
CastabilityAnnealling temperature
[°C]
Homogenization temperature
[°C]
Quenching temperature
[°C]
Ageing temperature
[°C]
Stress relievieng temperature
[°C]
Hot working temperature
[°C]
1070-1080
No data No data 600-800
950-1000
Comments:
30-45min.
950-1000
425-550
Comments:
2-5h
300-350
850-950
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