Free-machining Fe-Ni-Co alloy
Abstract
An iron-nickel-cobalt alloy is described which has the following weight percent composition: 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.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A controlled thermal expansion alloy consisting essentially of, in weight percent, about:
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.
2 . An alloy as set forth in claim 1 which contains not more than about 0.01% lead and not more than about 0.01% selenium.
3 . An alloy as set forth in claim 2 which contains at least about 0.08% bismuth.
4 . An alloy as set forth in claim 3 which contains not more than about 0.25% bismuth.
5 . An alloy as set forth in claim 1 which contains at least about 0.35% manganese.
6 . An alloy as set forth in claim 5 which contains at least about 0.008% sulfur.
7 . An alloy as set forth in claim 1 which contains not more than about 0.004% sulfur.
8 . An alloy as set forth in claim 7 which contains not more than about 0.01% lead and not more than about 0.01% selenium.
9 . An alloy as set forth in any of claims 1 to 8 which contains not more than about 0.25% bismuth.
10 . An alloy as set forth in claim 9 which contains at least about 0.08% bismuth.
11 . A controlled thermal expansion alloy consisting essentially of, in weight percent, about:
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.
12 . An alloy as set forth in claim 11 contains not more than about 0.01% lead and not more than about 0.01% selenium.
13 . An alloy as set forth in claim 12 which contains at least about 0.08% bismuth.
14 . An alloy as set forth in claim 13 which contains not more than about 0.25% bismuth.
15 . An alloy as set forth in claim 11 which contains at least about 0.35% manganese.
16 . An alloy as set forth in claim 15 which contains at least about 0.008% sulfur.
17 . An alloy as set forth in claim 11 which contains not more than about 0.004% sulfur.
18 . An alloy as set forth in claim 17 which contains not more than about 0.01% lead and not more than about 0.01% selenium.
19 . An alloy as set forth in any of claims 11 - 18 which contains at least about 0.10% bismuth.
20 . A controlled thermal expansion alloy consisting essentially of, in weight percent, about:
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.Join the waitlist — get patent alerts
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