Spring wire rod excelling in fatigue characteristics

Details Spring wire rod excelling in fatigue characteristics Spring wire rod excelling in fatigue characteristics

2011-03-08

2011-03-08

Yee, Deborah (Department: 1733)

Metal treatment

Stock

Ferrous

C148S908000, C148S580000, C148S334000, C148S335000

Reexamination Certificate

active

07901520

ABSTRACT:
Disclosed herein is a spring wire rod excelling in fatigue characteristics. It contains TiN inclusions having a specific size defined by the ratio of each group in all the visual fields as follows:(1) Visual fields in which the maximum thickness is no larger than 5 μm: less than 5%(2) Visual fields in which the maximum thickness is larger than 5 μm and no larger than 10 μm: no more than 30%(3) Visual fields in which the maximum thickness is larger than 10 μm and no larger than 25 μm: no less than 70%(4) Visual fields in which the maximum thickness is larger than 25 μm: less than 5%The visual field is the cross section passing through the center line of the wire rod.

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T. Abe, et al., “Gigacycle fatigue properties of 1800 MPa class spring steels”, Fitigue and Fracture of Engineering Materials and Structures, vol. 27, No. 2, XP-002497979, Feb. 2004, pp. 159-167.
Peter Spiekermann, et al., “Legierungen—ein besonderes patentrechtliches Problem?—Legierungsprüfungim Europäischen Patentamt”, Mitteilungen der deutschen Patentanwaelte, XP-000961882, Jan. 1, 1993, pp. 178-190.

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