Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
• • Y—GENERAL 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S428/00—Stock material or miscellaneous articles
  • Y10S428/922—Static electricity metal bleed-off metallic stock
  • Y10S428/923—Physical dimension
• • Y—GENERAL 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All 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)

Applications Claiming Priority (1)

Publications (1)

Family

ID=25312613

Family Applications (1)

Country Status (5)

Cited By (5)

Families Citing this family (2)

• 0
  • BE BE754940D patent/BE754940A/fr unknown
• 1969
  • 1969-08-20 US US852157A patent/US3689329A/en not_active Expired - Lifetime
• 1970
  • 1970-07-17 GB GB3471970A patent/GB1319291A/en not_active Expired
  • 1970-07-20 CA CA088609A patent/CA934993A/en not_active Expired
  • 1970-08-18 FR FR7030279A patent/FR2058914A5/fr not_active Expired

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