Cromo-Cobalto



Cromo-Cobalto

Il Cromo-Cobalto è una superlega caratterizzata da eccellenti proprietà meccaniche (resistenza, durezza, ecc.), resistenza alla corrosione ed alle alte temperature. Tali leghe sono comunemente utilizzate in ambito biomedicale e dentale, innesti medici ed anche per applicazioni ingegneristiche ad alta temperatura come i motori aeronautici. I pezzi costruiti con questo materiale sono privi di nichel (<0,1%), sterilizzabili ed adatti alle applicazioni biomediche. Sono caratterizzati da una struttura sottile ed uniforme.

Technical Data Test Method  
Typical achievable part accuracy, small parts - - - - - - - approx. ± 20 – 50 μm
Typical achievable part accuracy, large parts - - - - - - - approx. ± 50 – 200 μm
Min. wall thickness [1] - - - - - - - approx. 0.3 mm
Surface roughness [2] as built,
MP1 Performance (40 μm)
- - - - - - - Ra 7 - 10 μm, Rz 35 - 50 μm
Surface roughness [2] after polishing - - - - - - - Rz up to < 1 μm
Physical and Chemical properties of parts Test Method  
Material composition - - - - - - - Co (60 - 65 wt-%)
Cr (26 - 30 wt-%)
Mo (5 - 7 wt-% )
Si (≤ 1.0 wt-%)
Mn (≤ 1.0 wt-%)
Fe (≤ 0.75 wt-%)
C (≤ 0.16 wt-%)
Ni (≤ 0.10 wt-%)
Relative density - - - - - - - approx. 100 %
Density - - - - - - - approx. 8.3 g/cm3
Mechanical properties of parts at 20°C (68°F) Test Method As Built Stress Relieved [3]
Tensile strength [4] in horizontal direction (XY) ISO 6892-1:2009(B)
Annex D
1350 ± 100 MPa
196 ± 15 ksi
1100 ± 100 MPa
160 ± 15 ksi
Tensile strength [4] in vertical direction (Z) ISO 6892-1:2009(B)
Annex D
1200 ± 150 MPa
174 ± 22 ksi
1100 ± 100 MPa
160 ± 15 ksi
Yield strength (Rp 0.2 %) [4] in horizontal direction (XY) ISO 6892-1:2009(B)
Annex D
1060 ± 100 MPa
154 ± 15 ksi
600 ± 50 MPa
87 ± 7 ksi
Yield strength (Rp 0.2 %) [4] in vertical direction (Z) ISO 6892-1:2009(B)
Annex D
800 ± 100 MPa
116 ± 15 ksi
600 ± 50 MPa
87 ± 7 ksi
Modulus of elasticity [4] in horizontal direction (XY) ISO 6892-1:2009(B)
Annex D
200 ± 20 GPa
29 ± 3 Msi
200 ± 20 GPa
29 ± 3 Msi
Modulus of elasticity [4] in vertical direction (Z) ISO 6892-1:2009(B)
Annex D
190 ± 20 GPa
28 ± 3 Msi
200 ± 20 GPa
29 ± 3 Msi
Elongation at break [4] in horizontal direction (XY) ISO 6892-1:2009(B)
Annex D
(11 ± 3) % min. 20%
Elongation at break [4] in vertical direction (Z) ISO 6892-1:2009(B)
Annex D
(24 ± 4) % min. 20%
Hardness [6] EN ISO 6508-1 approx. 35 - 45 HRC - - - - - - -
Fatigue life [5] max. stress to reach 10 million cycles ASTM E466:1996 approx. 560 MPa
81 ksi
- - - - - - -
Fatigue life [5] max. stress to reach 1 million cycles ASTM E466:1996 approx. 660 MPa
96 ks
- - - - - - -
Thermal properties of parts Test Method As Built
Coefficient of thermal expansion over 20 - 500 °C (68 - 932 °F) - - - - - - - typ. 13.6 x 10-6 m/m °C
typ. 7.6 x 10-6 in/in °F
Coefficient of thermal expansion over 500 – 1000 °C (932-1832 °F) - - - - - - - typ. 15.1 x 10-6 m/m °C
typ. 8.4 x 10-6 in/in °F
Thermal conductivity at 20 °C (68 °F) - - - - - - - typ. 13 W/m °C
typ. 90 Btu in/(h ft2 °F)
Thermal conductivity at 300 °C (572 °F) - - - - - - - typ. 18 W/m °C
typ. 125 Btu in/(h ft2 °F)
Thermal conductivity at 500 °C (932 °F) - - - - - - - typ. 22 W/m °C
typ. 153 Btu in/(h ft2 °F)
Thermal conductivity at 1000 °C (1832 °F) - - - - - - - typ. 33 W/m °C
typ. 229 Btu in/(h ft2 °F)
Maximum operating temperature - - - - - - - approx. 1150 °C
approx. 2100 °F
Melting range - - - - - - - 1350 - 1430 °C
2460 - 2600 °F
Other Available Colors
 
Dark Gray

[1] Mechanical stability is dependent on geometry (wall height etc.) and application.
[2] Due to the layerwise building, the surface structure depends strongly on the orientation of the surface, for example sloping and curved surfaces exhibit a stair-step effect. The values also depend on the measurement method used. The values quoted here given an indication of what can be expected for horizontal (up-facing) or vertical surfaces.
[3] High temperature stress relieved, 6 hours at 1150 °C (2100 °F) under inert argon atmosphere.
[4] Tensile testing according to ISO 6892-1:2009 (B) Annex D, proportional test pieces, diameter of the neck area 5mm ( 0.2 inch), original gauge length 25mm (1 inch).
[5] Testing according to ASTM E466:1996, using vertical samples, as built, under 250 MPa (36.3 ksi) stress amplitude and 44 Hz testing frequency.
[6] Rockwell C (HRC) hardness measurement according to EN ISO 6508-1 on polished surface. Note that measured hardness can vary significantly depending on how the specimen has been prepared.
The information presented are typical values intended for reference and comparison purposes only. They should not be used for design specifications or quality control purposes.
End-use material performance can be impacted (+/-) by, but not limited to, part design, end-use conditions, etc. Actual values will vary with build conditions.
Product specifications are subject to change without notice.
The performance characteristics of these materials may vary according to application, operating conditions, or end use. Each user is responsible for determining that the material is safe, lawful and technical suitable for the intended laws and regulations. Zare makes no warranties of any kind, express or implied, including, but not limited to, the warranties of merchantability, fitness for a particular use, or warranty against patent infringement.
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