Free-machining Fe-Ni-Co alloy
OwnerLin Liinventor
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Abstract
An iron-nickel-cobalt alloy is described which has the following weight percent composition: 1 Carbon 0.04 max. Manganese 0.50 max. Silicon 0.20 max. Sulfur 0.020 max. Cobalt 16-18 Nickel 28-31 Boron 0.020 max. The alloy also contains 0.01-0.50% of an element selected from the group consisting of bismuth, lead, selenium, and combinations thereof. The balance of the alloy is essentially iron and the usual impurities. The alloy according to this invention provides a unique combination of machinability, low thermal expansion, phase stability, and hot workability.
Claims20
A controlled thermal expansion alloy consisting essentially of, in weight percent, about:
- 9 Carbon 0.04 max. Manganese 0.50 max. Silicon 0.20 max. Sulfur 0.020 max. Cobalt 16-18 Nickel 28-31 Boron 0.020 max.
- 0.01-0.50% of an element selected from the group consisting of bismuth, lead, selenium, and combinations thereof, and the balance of the alloy being essentially iron and the usual impurities.
A controlled thermal expansion alloy consisting essentially of, in weight percent, about:
- 10 Carbon 0.01 max. Manganese 0.45 max. Silicon 0.15 max. Sulfur 0.015 max. Cobalt 16.8-17.75 Nickel 28.8-29.6 Boron 0.018 max.
- 0.08-0.25% of an element selected from the group consisting of bismuth, lead, selenium, and combinations thereof, and the balance of the alloy being essentially iron and the usual impurities.
A controlled thermal expansion alloy consisting essentially of, in weight percent, about:
- 11 Carbon 0.01 max. Manganese 0.35-0.45 max. Silicon 0.08-0.15 max. Sulfur 0.004 max. Cobalt 16.8-17.75 Nickel 28.8-29.6 Bismuth 0.10-0.20 Boron 0.018 max.
- and the balance is essentially iron and the usual impurities.
Dependencies are inferred from the claim text.