Bearing component

Patent metadata

Field	Value
Publication number	US-9546680-B2
Application number	US-201214354749-A
Country	US
Kind code	B2
Filing date	Oct 26, 2012
Priority date	Oct 28, 2011
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

A bearing component formed from a steel composition and providing carbon, silicon, manganese, chromium, cobalt, vanadium, and at least one of the following elements sulphur, phosphorous, molybdenum, aluminum, arsenic, tin, antimony, and the balance iron, together with impurities.

First claim

The invention claimed is:

1. A bearing component formed from a steel composition comprising:
1.8-2.8 wt. % carbon,
1.0-2.0 wt. % silicon,
1.0-2.5 wt. % manganese,
1.0-2.5 wt. % chromium,
1.0-2.0 wt. % cobalt,
5.0-11.0 wt. % vanadium,
0-0.1 wt. % sulphur,
0-0.1 wt. % phosphorous,
0-1.35 wt. % molybdenum,
0-0.5 wt. % aluminium,
0-0.075 wt. % arsenic,
0-0.075 wt. % tin, and
0-0.075 wt. % antimony,

the balance being iron and unavoidable impurities.

2. The bearing component as claimed in claim 1 , comprising 1.2-2.0 wt. % silicon.

3. The bearing component as claimed in claim 1 , comprising 1.2-2.5 wt. % manganese.

4. The bearing component as claimed in claim 1 , comprising 1.0-1.8 wt. % chromium.

5. The bearing component as claimed in claim 1 , comprising 6.5-11.0 wt. % vanadium.

6. The bearing component as claimed in claim 1 , comprising 2.2 to 2.5 wt. % carbon.

7. The bearing component as claimed in claim 1 , comprising 1.4-1.6 wt. % silicon.

8. The bearing component as claimed in claim 1 , comprising 1.6-1.8 wt. % manganese.

9. The bearing component as claimed in claim 1 , comprising 1.6-1.8 wt. % chromium.

10. The bearing component as claimed in claim 1 , comprising 11.3-1.5 wt. % cobalt.

11. The bearing component as claimed in claim 1 , comprising 7.0-8.0 wt. % vanadium.

12. The bearing component as claimed in claim 1 , wherein the microstructure of the steel composition comprises bainite and/or martensite.

13. The bearing component as claimed in claim 1 , wherein the microstructure of the steel composition comprises vanadium carbide precipitates.

14. The bearing component as claimed in claim 1 , wherein the microstructure of the steel composition comprises plates of bainite of less than 100 nm thickness.

15. The bearing component as claimed in claim 1 , wherein the microstructure of the steel composition comprises plates of bainite interspersed with austenite films.

16. The bearing component as claimed in claim 1 , wherein the bearing component is formed as one of a rolling element, an inner ring, or an outer ring.

17. The bearing component as claimed in claim 1 , comprising:
1.2-1.8 wt. % silicon,
1.2-2.3 wt. % manganese, and
6.5-9.0 wt. % vanadium.

18. The bearing component as claimed in claim 1 , wherein the steel composition has a microstructure composed of at least 60 vol. % bainite.

19. A bearing component formed from a steel composition consisting of:
1.8-2.8 wt. % carbon,
1.0-2.0 wt. % silicon,
1.0-2.5 wt. % manganese,
1.0-2.5 wt. % chromium,
1.0-2.0 wt. % cobalt,
5.0-11.0 wt. % vanadium, and
0-0.1 wt. % sulphur,
0-0.1 wt. % phosphorous,
0-1.35 wt. % molybdenum,
0-0.5 wt. % aluminium,
0-0.075 wt. % arsenic,
0-0.075 wt. % tin,
0-0.075 wt. % antimony, the balance being iron and unavoidable impurities.

20. The bearing component as claimed in claim 19 , wherein the steel composition has a microstructure composed of at least 60 vol. % bainite and the bainite is composed of plates having a thickness of less 100 nm.

Assignees

• Beswick John
• Sherif Mohamed
• Skf Ab

Inventors

• Beswick John
• Sherif Mohamed

Classifications

• F16C33/32

  Balls · CPC title

• C22C38/24

  with vanadium · CPC title

• C21D9/40 Primary

  for rings; for bearing races · CPC title

• F16C33/62

  Selection of substances · CPC title

• C21D1/20

  Isothermal quenching, e.g. bainitic hardening · CPC title