当前申请(专利权)人地址：
Göteobrg 41550, Sweden | 1 Avenue Marc Sequin Parc Industrial de la Brasserie, Saint-Vallier Sur Rhone 26240, France (including Overseas Departments and Territories)
摘要：
A steel comprising (by weight): 0.04-0.1 % carbon, 10.5-13 % chromium, 1.5-3.75 % molybdenum, 0.3-1.2 % vanadium, 0.3-2.0 % nickel, 6-9 % cobalt, 0.05-0.4 % silicon, 0.2-0.8 % manganese, 0.02-0.06 % niobium, 0-2.5 % copper, 0-0.1 % aluminium, 0-250 ppm nitrogen and 0-30 ppm boron, with the balance being iron and impurities. The steel can be used to make an aerospace bearing component such as an inner ring an outer ring or a rolling element with a microstructure that comprises martensite, one or more of carbides, nitrides and/or carbonitrides and optionally retained austenite, with the surface of the component having been case-carburised and/or carbonitrided. After carburising and/or carbonitriding the surface nitride or borided, burnished, tempered, ground, lapped or honed. The components can be made by forging, additive manufacturing or spray forming.
权利要求：
CLAIMS:
L A steel alloy for a bearing, the alloy having a composition comprising:
from 0.04 to 0.1 wt.% carbon,
from 10.5 to 13 wt.% chromium,
from 1.5 to 3.75 wt.% molybdenum,
from 0.3 to 1.2 wt.% vanadium,
from 0.3 to 2.0 wt.% nickel
from 6 to 9 wt.% cobalt,
from 0.05 to 0.4 wt. % silicon,
from 0.2 to 0.8 wt.% manganese,
from 0.02 to 0.06 wt.% niobium,
from 0 to 2.5 wt. % copper,
from 0 to 0.1 wt.% aluminium,
from 0 to 250 ppm nitrogen,
from 0 to 30 ppm boron, and
the balance iron, together with any unavoidable impurities.
2. The steel alloy of claim 1, comprising from 0.05 to 0.09 wt.% carbon, more
preferably from 0.06 to 0.08 wt.% carbon, still more preferably approximately
0.07 wt % carbon.
3. The steel alloy of claim 1 or claim 2, comprising from 10.7 to 12.7 wt. %
chromium, more preferably from 11 to 12.5 wt.% chromium.
4, The steel alloy of any one of the preceding claims, comprising from 1.65 to 3.6
wt.% molybdenum.
5. The steel alloy of any one of the preceding claims, comprising from 0.4 to 1.1
wt.% vanadium, more preferably from 0.5 to 1.1 wt.% vanadium.
6. The steel alloy of any one of the preceding claims, comprising at least 0.65
wt. % vanadium.
/. The steel alloy of any one of the preceding claims, comprising from 0.3 to 1.9
wt. % nickel, preferably from 0.4 to 1.9 wt.% nickel, more preferably from 0.5 to
1.8 wt.% nickel.
8. The steel alloy of any one of the preceding claims, comprising from 6.5 to 7.7
wt.% cobalt, more preferably from 7 to 7.5 wt.% cobalt.
9. The steel alloy of any one of the preceding claims, comprising from 0.05 to 0.3
wt. % silicon, more preferably from 0.15 to 0.25 wt.% silicon.
10. The steel alloy of any one of the preceding claims, comprising from 0.3 to 0.7
wt.% manganese, more preferably from 0.4 to 0.6 wt.% manganese.
11. The steel alloy of any one of the preceding claims, comprising from 0.02 to
0.04 wt.% niobium.
12. The steel alloy of any preceding claim having a microstructure comprising
martensite, one or more of carbides, nitrides and/or carbonitrides, and
optionally retained austenite.
13. A bearing component made from the steel alloy of any of claims 1 to 12.
14. A bearing component as claimed in claim 13, wherein a surface of the bearing
component is case-carburised and/or carbonitrided.
16. A bearing comprising a bearing component according to claim 13 or 14, the
bearing component being formed by at least one of an inner ring, an outer ring,
or a rolling element of the bearing.
16. The bearing of claim 15, wherein the bearing component is an inner ring and
an outer ring, and the bearing further comprises rolling elements made of a
ceramic material.