EP2761043A1 - White metal babbitt for rolling mill bushing - Google Patents

White metal babbitt for rolling mill bushing

Info

Publication number
EP2761043A1
EP2761043A1 EP12758948.9A EP12758948A EP2761043A1 EP 2761043 A1 EP2761043 A1 EP 2761043A1 EP 12758948 A EP12758948 A EP 12758948A EP 2761043 A1 EP2761043 A1 EP 2761043A1
Authority
EP
European Patent Office
Prior art keywords
alloy
weight
white metal
cobalt
tin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12758948.9A
Other languages
German (de)
French (fr)
Inventor
Karl F. Seelig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Industry Inc
Original Assignee
Siemens Industry Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Industry Inc filed Critical Siemens Industry Inc
Publication of EP2761043A1 publication Critical patent/EP2761043A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C13/00—Alloys based on tin
    • C22C13/02—Alloys based on tin with antimony or bismuth as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C13/00—Alloys based on tin
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F16C33/121—Use of special materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/30—Alloys based on one of tin, lead, antimony, bismuth, indium, e.g. materials for providing sliding surfaces
    • F16C2204/34—Alloys based on tin
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2322/00—Apparatus used in shaping articles
    • F16C2322/12—Rolling apparatus, e.g. rolling stands, rolls

Definitions

  • Embodiments and aspects of the present invention relate to tin based white metal alloys useful in various industrial applications, including the bushings of rolling mill oil film bearings.
  • ASTM #2 The most prominent white metal alloy used in oil film bearings in the rolling mill field is described in ASTM B23 #2, (referred to here as ASTM #2) and is comprised primarily of tin, with antimony and copper, as alloying elements. ASTM #2 is well understood and is readily deposited onto bushing shells via centrifugal casting, spray deposition, or welding. Unfortunately, ASTM #2 has relatively low fatigue resistance, which limits load capacity of bearings made with this material.
  • the alloy of Roeingh is suitable for centrifugal casting applications. But due to the brittleness of the zinc component, this alloy cannot be readily drawn into wire for use in spray and welding applications.
  • U.S. Patent No. 4,140,835 (Goddard) and U.K. Application No. 2146354 A disclose cobalt as a component of tin based white metal alloys that also include cadmium.
  • Cadmium is a known carcinogen that has been banned from most workplaces and thus is undesirable.
  • U.S. Patent No. 4,795,682 discloses a tin/cobalt alloy useful as a sacrificial coating designed to absorb particulates. Such coatings lack the toughness required for heavily loaded oil film bearing applications, and the disclosed use of cobalt at elevated percentage levels would inhibit the flow characteristics necessary in a casting or welding process.
  • aspects of the present invention relate to a tin based white metal alloy that is universally useful in centrifugal casting, spraying, and welding applications. Aspects of the present invention also relate to a tin based white metal alloy having the elevated strength and fatigue resistance required for use in heavily loaded oil film bearings of the type commonly found in the metals industry.
  • aspects of the present invention further relate to a tin based white metal alloy that is low in toxicity and generally free from carcinogenic components, including cadmium and the like.
  • aspects of the present invention may be achieved by replacing zinc and silver components of the alloy disclosed in the above referenced U.S. Patent No. 6,589,372 Bl with cobalt in amounts ranging between about 0.1%-0.7% by weight, with amounts ranging between 0.2% and 0.5% being considered optimal.
  • Embodiments of the present invention are not limited to use in the described systems.
  • a tin based white metal alloy in accordance with the present invention includes as principal components tin, antimony, and copper, to which cobalt has been added. Addition of cobalt in amounts above approximately 0.7% by weight has been found to disadvantageously lower the fluidity of the resulting alloy. Thus, cobalt additions of between about 0.1%-0.7% by weight have been found to be effective in achieving the above-stated objectives, with additions of between about 0.2%-0.5% by weight being optimal.
  • Tin based white metal alloys of the present invention consist essentially of the components listed in the following examples:
  • alloys of the present invention may be centrifugally cast, and may also be drawn into wire for use in spraying or welding applications. Further, alloys of the present invention have the strength and fatigue resistance required for use in heavily loaded bearing applications, including the steel making industry applications, while being free of components that either are banned or otherwise detrimental.
  • Fatigue resistance of white metal alloys can be determined experimentally through the use of tension/compression specimens that are cycled until failure. Laboratory test data comparing the alloy of the present invention with commonly used alloys in the field are illustrated in TABLE 1. Based on test data the fatigue strength of the alloy containing 0.3% to 0.5% cobalt has excellent fatigue resistance, exceeding that of other alloys commonly used in the rolling mill application. Test data shown was determined in accordance with ASTM E 466 with an applied load of 7,500 psi (51.7 MPa) and test frequency of 10 Hz. Axial Fatigue Resistance of Various White Metal Alloys

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Sliding-Contact Bearings (AREA)
  • Contacts (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

A tin based white metal alloy consisting essentially by weight of approximately 5.0%-9.0% antimony, approximately 3.0%-8.0% copper, approximately 0.1%-0.7% cobalt, and the balance tin.

Description

WHITE METAL BABBITT FOR ROLLING MILL BUSHING
CROSS REFERENCE TO RELATED APPLICATION
This application claims benefit, under 35 U.S.C. § 119(e), of U.S. Provisional Application Serial No. 61/541 ,395, filed 30 September 201 1, the entire contents and substance of which is hereby incorporated by reference.
BACKGROUND
1. Field
Embodiments and aspects of the present invention relate to tin based white metal alloys useful in various industrial applications, including the bushings of rolling mill oil film bearings.
2. Description of Related Art
The most prominent white metal alloy used in oil film bearings in the rolling mill field is described in ASTM B23 #2, (referred to here as ASTM #2) and is comprised primarily of tin, with antimony and copper, as alloying elements. ASTM #2 is well understood and is readily deposited onto bushing shells via centrifugal casting, spray deposition, or welding. Unfortunately, ASTM #2 has relatively low fatigue resistance, which limits load capacity of bearings made with this material.
Various versions of Nickel hardened white metal alloys have been used where common versions are referred to as Tuftin. These alloys can be cast and welded, but they contain Nickel, which is a heavy metal that is undesirable for environmental reasons. U.S. Patent No. 6,589,372 Bl (Roeingh et al.) discloses use of a known tin based white metal alloy consisting essentially of antimony, copper, zinc, silver, and tin.
The alloy of Roeingh is suitable for centrifugal casting applications. But due to the brittleness of the zinc component, this alloy cannot be readily drawn into wire for use in spray and welding applications.
U.S. Patent No. 4,140,835 (Goddard) and U.K. Application No. 2146354 A disclose cobalt as a component of tin based white metal alloys that also include cadmium. Cadmium is a known carcinogen that has been banned from most workplaces and thus is undesirable.
U.S. Patent Nos. 4,150,983 (Mori) and 5,512,242 (Tanake et al.) disclose alloys in which cobalt is employed along with chrome. The inclusion of chrome is impractical as it is not readily soluble under normal alloying conditions.
U.S. Patent No. 4,795,682 (Turner et al.) discloses a tin/cobalt alloy useful as a sacrificial coating designed to absorb particulates. Such coatings lack the toughness required for heavily loaded oil film bearing applications, and the disclosed use of cobalt at elevated percentage levels would inhibit the flow characteristics necessary in a casting or welding process.
SUMMARY
Briefly described, aspects of the present invention relate to a tin based white metal alloy that is universally useful in centrifugal casting, spraying, and welding applications. Aspects of the present invention also relate to a tin based white metal alloy having the elevated strength and fatigue resistance required for use in heavily loaded oil film bearings of the type commonly found in the metals industry.
Aspects of the present invention further relate to a tin based white metal alloy that is low in toxicity and generally free from carcinogenic components, including cadmium and the like.
In one embodiment, aspects of the present invention may be achieved by replacing zinc and silver components of the alloy disclosed in the above referenced U.S. Patent No. 6,589,372 Bl with cobalt in amounts ranging between about 0.1%-0.7% by weight, with amounts ranging between 0.2% and 0.5% being considered optimal.
DETAILED DESCRIPTION
To facilitate an understanding of embodiments, principles, and features of the present invention, they are explained hereinafter with reference to implementation in illustrative embodiments. In particular, they are described in the context of being a novel and non-obvious tin-based white metal alloy.
Embodiments of the present invention, however, are not limited to use in the described systems.
The components and materials described hereinafter as making up the various embodiments are intended to be illustrative and not restrictive. Many suitable components and materials that would perform the same or a similar function as the materials described herein are intended to be embraced within the scope of embodiments of the present invention. A tin based white metal alloy in accordance with the present invention includes as principal components tin, antimony, and copper, to which cobalt has been added. Addition of cobalt in amounts above approximately 0.7% by weight has been found to disadvantageously lower the fluidity of the resulting alloy. Thus, cobalt additions of between about 0.1%-0.7% by weight have been found to be effective in achieving the above-stated objectives, with additions of between about 0.2%-0.5% by weight being optimal.
Tin based white metal alloys of the present invention consist essentially of the components listed in the following examples:
EXAMPLE I
Antimony 5.0-9.0% by weight
Copper 3.0-8.0% by weight
Cobalt 0.1-0.7% by weight
Tin Balance
EXAMPLE II
Antimony 6.0-8.0% by weight
Copper 3.0-8.0% by weight
Cobalt 0.1-0.7% by weight
Tin Balance
EXAMPLE III
Antimony 6.0-8.0% by weight
Copper 6.0-7.0% by weight
Cobalt 0.1-0.7% by weight
Tin Balance
EXAMPLE IV
Antimony 6.0-8.0% by weight
Copper 6.0-7.0% by weight Cobalt 0.2-0.5% by weight
Tin Balance
EXAMPLE V
Antimony 6.0-8.0% by weight
Copper 6.0-7.0% by weight
Cobalt 0.2-0.5% by weight
Tin Balance
The resulting alloys of the present invention may be centrifugally cast, and may also be drawn into wire for use in spraying or welding applications. Further, alloys of the present invention have the strength and fatigue resistance required for use in heavily loaded bearing applications, including the steel making industry applications, while being free of components that either are banned or otherwise detrimental.
Fatigue resistance of white metal alloys can be determined experimentally through the use of tension/compression specimens that are cycled until failure. Laboratory test data comparing the alloy of the present invention with commonly used alloys in the field are illustrated in TABLE 1. Based on test data the fatigue strength of the alloy containing 0.3% to 0.5% cobalt has excellent fatigue resistance, exceeding that of other alloys commonly used in the rolling mill application. Test data shown was determined in accordance with ASTM E 466 with an applied load of 7,500 psi (51.7 MPa) and test frequency of 10 Hz. Axial Fatigue Resistance of Various White Metal Alloys
18000
16000
™ 14000
g 12000
to 10000
8000
6000
4000
"o 2000
υ
ASTM #2 Roeingh et al Tuftin Modified 0.3% - 0.5% Co Alloy
Alloy
TABLE 1 : Comparison of Fatigue Resistance, as measured in Cycles to Failure in accordance with ASTM E 466. specimens stresses to 7.500 psi (51.7 MPa)
While embodiments of the present invention have been disclosed in exemplary forms, it will be apparent to those skilled in the art that many modifications, additions, and deletions can be made therein without departing from the spirit and scope of the invention and its equivalents, as set forth in the following claims.

Claims

CLAIMS What is claimed is:
1. A tin based white metal alloy consisting essentially by weight of about 5.0% to 9.0% antimony, about 3.0 to about 8.0% copper, about 0.1 %> to about 0.7% cobalt, and the balance tin.
2. The alloy of claim 1 wherein the content of antimony is about 6.0% to about 8.0% by weight.
3. The alloy of claim 1 wherein the content of copper is about 6.0% to about 7.0% by weight.
4. The alloy of claim 1 wherein the content of cobalt is about 0.2% to about 0.5% by weight.
5. The alloy of claim 1 adapted for us use in heavy load bearings for the steel fabrication industry.
6 The alloy of claim 1 adapted for us in heavy load bearings for the use in power generation equipment.
7. The alloy in claim 1 adapted for us for spray and welded formed bearings
8 The alloy of claim 1 adapted for use for cast formed Babbitt type bearings
9. A tin based white metal alloy consisting essentially by weight of about 6.0% to about 8.0%) antimony, about 6.0% to about 7.0% copper, about 0.2 to about 0.5%> cobalt, and the balance tin.
10. The alloy of claim 9 adapted for use in at least one of: heavy load bearings for the steel fabrication industry; heavy load bearings for the use in power generation equipment; spray and welded formed bearings; or cast formed Babbit type bearings.
EP12758948.9A 2011-09-30 2012-08-30 White metal babbitt for rolling mill bushing Withdrawn EP2761043A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201161541395P 2011-09-30 2011-09-30
US13/590,996 US20130084209A1 (en) 2011-09-30 2012-08-21 White Metal Babbitt for Rolling Mill Bushing
PCT/US2012/053004 WO2013048664A1 (en) 2011-09-30 2012-08-30 White metal babbitt for rolling mill bushing

Publications (1)

Publication Number Publication Date
EP2761043A1 true EP2761043A1 (en) 2014-08-06

Family

ID=47992760

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12758948.9A Withdrawn EP2761043A1 (en) 2011-09-30 2012-08-30 White metal babbitt for rolling mill bushing

Country Status (14)

Country Link
US (1) US20130084209A1 (en)
EP (1) EP2761043A1 (en)
JP (1) JP2014534335A (en)
KR (1) KR20140070562A (en)
CN (1) CN103842532A (en)
AR (1) AR088179A1 (en)
BR (1) BR112014007510A2 (en)
CA (1) CA2850419A1 (en)
IN (1) IN2014DN01803A (en)
MX (1) MX2014003658A (en)
RU (1) RU2014117637A (en)
TW (1) TW201326414A (en)
WO (1) WO2013048664A1 (en)
ZA (1) ZA201402160B (en)

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CN104412426A (en) * 2012-09-06 2015-03-11 株式会社吴羽 Carbonaceous material for negative electrode of nonaqueous-electrolyte secondary battery, process for producing same, and negative electrode and nonaqueous-electrolyte secondary battery obtained using said carbonaceous material
AT515099B1 (en) * 2014-01-31 2015-06-15 Miba Gleitlager Gmbh Multilayer plain bearings
CN103949614B (en) * 2014-05-06 2015-12-30 浙江机电职业技术学院 The preparation method of the radial bearing shell product of opposite opened
CN110227809B (en) * 2018-09-07 2022-01-11 襄阳航力机电技术发展有限公司 Centrifugal casting process of tin-based bearing alloy
CN114058899A (en) * 2022-01-17 2022-02-18 中机智能装备创新研究院(宁波)有限公司 Preparation method of tin-based babbitt alloy
CN115652137B (en) * 2022-03-01 2024-03-29 中国机械总院集团宁波智能机床研究院有限公司 Tin-based Babbitt alloy, preparation method thereof and bearing bush

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Also Published As

Publication number Publication date
MX2014003658A (en) 2014-05-21
CA2850419A1 (en) 2013-04-04
CN103842532A (en) 2014-06-04
IN2014DN01803A (en) 2015-05-15
JP2014534335A (en) 2014-12-18
KR20140070562A (en) 2014-06-10
RU2014117637A (en) 2015-11-10
BR112014007510A2 (en) 2017-04-04
ZA201402160B (en) 2015-05-27
US20130084209A1 (en) 2013-04-04
AR088179A1 (en) 2014-05-14
WO2013048664A1 (en) 2013-04-04
TW201326414A (en) 2013-07-01

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