US3689329A - Carbon steel spring elements - Google Patents

Carbon steel spring elements Download PDF

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Publication number
US3689329A
US3689329A US852157A US3689329DA US3689329A US 3689329 A US3689329 A US 3689329A US 852157 A US852157 A US 852157A US 3689329D A US3689329D A US 3689329DA US 3689329 A US3689329 A US 3689329A
Authority
US
United States
Prior art keywords
carbon
percent
steel
carbon steel
spring elements
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.)
Expired - Lifetime
Application number
US852157A
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English (en)
Inventor
Roy F Kern
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.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Application granted granted Critical
Publication of US3689329A publication Critical patent/US3689329A/en
Assigned to CATERPILLAR INC., A CORP. OF DE. reassignment CATERPILLAR INC., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CATERPILLAR TRACTOR CO., A CORP. OF CALIF.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00Stock material or miscellaneous articles
    • Y10S428/922Static electricity metal bleed-off metallic stock
    • Y10S428/923Physical dimension
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/12All metal or with adjacent metals

Definitions

  • Spring elements such as coil springs, leaf springs, torsion bars, etc. have conventionally been made from alloy steels within the prior art. This preference appears to have arisen out of the general belief that carbon steel springs could not be quenched and tempered to high strength levels in sizes much greater than 0.250 inch in diameter or thickness. Accordingly, carbon steel has not been considered for use in spring elements since it was believed that the weight and size of the spring elements would have to be inordinately great to achieve adequate strength standards.
  • carbon steels may be employed to produce very satisfactory spring elements through the addition of boron and the control of various other elements within the steel composition.
  • An alloy steel is defined by the American Iron and Steel Institute as follows:
  • a very basic advantage for the present carbon steel in the manufacture of spring elements lies in the reduction of costs which it makes possible. This cost reduction is made possible through the elimination of various alloying agents of which chromium is a particularly important example.
  • manufacture of spring elements from the present carbon steel compositions is made independent of elements such as the above alloying agents which tend to be relatively scarce.
  • the elements present within the steel composition of the present invention tend to be available in plentiful supply.
  • spring elements manufactured from the present carbon steel exhibit at least equivalent static strength and fatigue strength as compared to spring elements manufactured from conventional alloy steels. It further appears that spring elements manufactured according to the present invention exhibit certain advantages over alloy steels. One outstanding advantage for carbon steels lies in its shell hardening characteristics to provide endurance limit fatigue strength. A second advantage is the fracture toughness of carbon steels according to the present invention. Because of these advantages, spring elements formed from the present carbon steel composition may have increased durability and fatigue life as compared to spring elements formed from conventional alloy steels.
  • Carbon steel compositions of the present invention are comprised of iron in large part.
  • Other elements which are particularly considered within the composition include carbon, manganese, silicon, and boron as well as maximum percentages for sulfur and phosphorus.
  • Element Percent Carbon 0.5-0.8. Manganese 0.50-1.65 Silicon 0.020.60. Sulfur 0.50 max. Phosphorus 0.040 max. Boron 00005-0007. Iron Balance.
  • the steel should include no more than 0.40 minimum percent copper and no more than 0.60 maximum percent copper.
  • Preferred approximate limits for a carbon-manganeseboron steel according to the present invention are as follows:
  • Steels of this composition may be produced, for example, in flat bars, wire, cold finished or hot finished bars fabricated by generally customary techniques.
  • hot-coiled springs may be heated to 1600 F., coiled, oil-quenched and tempered immediately thereafter. They may also be coiled, cooled, reheated to 1,550 F. and then oil-quenched followed by a tempering operation at 700 F.
  • Cold-coiled springs may be heated to approximately 1550 F., quenched and then tempered also at 700 F.
  • Typical properties for recoil spring stock formed with the above composition are as follows:
  • the silicon content is preferably held to approximately .02-0.30 percent with the steel being preferably characterized as having a fine grain.
  • the manganese composition of about 1.10-1.40 in the preferred composition may be maintained.
  • the manganese content of the preferred composition is held to the approximate range of 1.20-1.40 percent.
  • Carbon steel spring stock of claim 1 which includes from about .4 to .6 percent copper.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Springs (AREA)
US852157A 1969-08-20 1969-08-20 Carbon steel spring elements Expired - Lifetime US3689329A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US85215769A 1969-08-20 1969-08-20

Publications (1)

Publication Number Publication Date
US3689329A true US3689329A (en) 1972-09-05

Family

ID=25312613

Family Applications (1)

Application Number Title Priority Date Filing Date
US852157A Expired - Lifetime US3689329A (en) 1969-08-20 1969-08-20 Carbon steel spring elements

Country Status (5)

Country Link
US (1) US3689329A (fr)
BE (1) BE754940A (fr)
CA (1) CA934993A (fr)
FR (1) FR2058914A5 (fr)
GB (1) GB1319291A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3933441A (en) * 1971-05-10 1976-01-20 Compagnie Generale Des Establissements Michelin, Raison Sociale Michelin & Cie Thin, continuous steel wires
US4171233A (en) * 1978-05-22 1979-10-16 Bethlehem Steel Corporation Lens quality of die steel
US4364772A (en) * 1981-05-28 1982-12-21 Titanium Metals Corporation Of America Rail wheel alloy
DE3312205A1 (de) * 1982-04-03 1983-10-20 Sumitomo Electric Industries, Ltd., Osaka Borhaltiger stahl und verfahren zu dessen herstellung
US20050189851A1 (en) * 2004-02-27 2005-09-01 Kirt Martin Freestanding workstation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE404703C (sv) * 1976-09-20 1986-06-23 Garphytte Bruk Ab Ventilfjedertrad av laglegerat stal
GB8417468D0 (en) * 1984-07-09 1984-08-15 Bekaert Sa Nv Carbon steel wire

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3933441A (en) * 1971-05-10 1976-01-20 Compagnie Generale Des Establissements Michelin, Raison Sociale Michelin & Cie Thin, continuous steel wires
US4171233A (en) * 1978-05-22 1979-10-16 Bethlehem Steel Corporation Lens quality of die steel
US4364772A (en) * 1981-05-28 1982-12-21 Titanium Metals Corporation Of America Rail wheel alloy
DE3312205A1 (de) * 1982-04-03 1983-10-20 Sumitomo Electric Industries, Ltd., Osaka Borhaltiger stahl und verfahren zu dessen herstellung
DE3312205C2 (fr) * 1982-04-03 1987-05-27 Sumitomo Electric Industries, Ltd., Osaka, Jp
US20050189851A1 (en) * 2004-02-27 2005-09-01 Kirt Martin Freestanding workstation

Also Published As

Publication number Publication date
CA934993A (en) 1973-10-09
BE754940A (fr) 1971-02-17
GB1319291A (en) 1973-06-06
FR2058914A5 (fr) 1971-05-28

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Legal Events

Date Code Title Description
AS Assignment

Owner name: CATERPILLAR INC., A CORP. OF DE.,ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515

Owner name: CATERPILLAR INC., 100 N.E. ADAMS STREET, PEORIA, I

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515