Cobalt-based superalloys are metallic materials where cobalt is the primary element, and they are alloyed with significant amounts of other elements like chromium, nickel, tungsten, and tantalum. Their distinct feature is their superior high-temperature strength and wear resistance, primarily due to the high melting point of cobalt and the stability of their carbide precipitates at elevated temperatures. While they are known for their excellent hot corrosion and oxidation resistance, their creep strength might sometimes be lower compared to nickel-based superalloys.
These alloys are vital in applications that demand extreme wear resistance and high-temperature performance, such as gas turbine components, medical implants, and cutting tools.
Norms: ASTM B435, ASTM B572, ASTM B573, ASTM B619, ASTM B622, ASTM B626, ASME SB-435, ASME SB-572, ASME SB-573, ASME SB-619, ASME SB-622, ASME SB-626, ASTM B637, AMS 5703, AMS 5704, AMS 5872
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Grades
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Ni %
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Cr %
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Fe %
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Mo %
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Co %
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Al %
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Ti %
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W %
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Nb/Cb %
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C %
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Mn %
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Si %
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S %
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P %
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Others
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2.4683
Alloy 706
UNS N09706
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Balance
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14.0-17.0
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40.0-43.0
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1.5-2.5
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1
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0.2-0.8
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1.5-2.0
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-
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2.5-3.5
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0.06
|
0.3
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0.3
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0.015
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0.015
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B:0.006
|
|
2.4711
Alloy 4711
UNS N06002
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Balance
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20.5-23.0
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17.0-20.0
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8.0-10.0
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0.5-2.5
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-
|
-
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0.2-1.0
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-
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0.05-0.15
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1.0
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1.0
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0.03
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0.04
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-
|
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2.4964
Alloy 263
UNS N07263
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Balance
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19.0-21.0
|
0,5
|
5.6-6.1
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19.0-21.0
|
0.3-0.6
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1.9-2.4
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-
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-
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0.40-0.10
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0.6
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0.4
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0.015
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0.015
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B:0.004
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