DE3375699D1 - Spring steel - Google Patents

Spring steel

Info

Publication number
DE3375699D1
DE3375699D1 DE8383902908T DE3375699T DE3375699D1 DE 3375699 D1 DE3375699 D1 DE 3375699D1 DE 8383902908 T DE8383902908 T DE 8383902908T DE 3375699 T DE3375699 T DE 3375699T DE 3375699 D1 DE3375699 D1 DE 3375699D1
Authority
DE
Germany
Prior art keywords
steel
boron
amount
added
oxygen
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
Application number
DE8383902908T
Other languages
German (de)
Inventor
Bjoern Hugo Andersson
Carl Erik Grip
Erik Bertil Joergen Hagstad
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.)
SSAB Svenskt Stal AB
Original Assignee
SSAB Svenskt Stal AB
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=20347719&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE3375699(D1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by SSAB Svenskt Stal AB filed Critical SSAB Svenskt Stal AB
Application granted granted Critical
Publication of DE3375699D1 publication Critical patent/DE3375699D1/en
Expired 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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

Abstract

Steel and process for its manufacture which is suitable for the production of springs, especially leafsprings for vehicles. The steel which is vacuum-treated is an ordinary low-carbon steel with 0.20 - 0.40 % C. Its composition is incidentally characterised in that the oxygen content does not exceed 0.040 % and in that boron is added to an amount of 0.002 - 0.004 % and titanium to an amount of 0.015 - 0.050 %. The addition of boron causes the hardenability to increase greatly, thus making it possible to keep the carbon content low and, in consequence, reducing the danger of destructive decarbonisation. A characteristic of the process of production consists in the fact that the steel is produced in an oxygen converter in such a manner that the nitrogen content in the ladle does not exceed 20 ppm, in that it is subsequently subjected to vacuum treatment and in that Al is added so that the amount of uncombined oxygen drops to max. 40 ppm, whereafter titanium and boron are added prior to continuous casting and rolling.
DE8383902908T 1982-09-06 1983-09-05 Spring steel Expired DE3375699D1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8205037A SE8205037L (en) 1982-09-06 1982-09-06 FJEDERSTAL
PCT/SE1983/000310 WO1984000981A1 (en) 1982-09-06 1983-09-05 Spring steel

Publications (1)

Publication Number Publication Date
DE3375699D1 true DE3375699D1 (en) 1988-03-24

Family

ID=20347719

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8383902908T Expired DE3375699D1 (en) 1982-09-06 1983-09-05 Spring steel

Country Status (6)

Country Link
EP (1) EP0139649B1 (en)
AT (1) ATE32528T1 (en)
DE (1) DE3375699D1 (en)
FI (1) FI73467C (en)
SE (1) SE8205037L (en)
WO (1) WO1984000981A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5520591B2 (en) * 2009-12-18 2014-06-11 愛知製鋼株式会社 Steel and leaf spring parts for high fatigue strength leaf springs

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3009491A1 (en) * 1979-03-14 1980-09-25 Daido Steel Co Ltd STEEL FOR COLD FORGING AND METHOD FOR THE PRODUCTION THEREOF

Also Published As

Publication number Publication date
EP0139649A1 (en) 1985-05-08
FI843928A0 (en) 1984-10-05
FI73467C (en) 1987-10-09
FI73467B (en) 1987-06-30
ATE32528T1 (en) 1988-03-15
WO1984000981A1 (en) 1984-03-15
SE8205037L (en) 1984-03-07
FI843928L (en) 1984-10-05
EP0139649B1 (en) 1988-02-17
SE8205037D0 (en) 1982-09-06

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Legal Events

Date Code Title Description
8363 Opposition against the patent
8339 Ceased/non-payment of the annual fee