Metal treatment – Stock – Ferrous
Reexamination Certificate
2005-01-04
2005-01-04
Ip, Sikyin (Department: 1742)
Metal treatment
Stock
Ferrous
C148S321000, C148S334000, C148S328000, C420S009000, C420S100000, C420S104000, C420S105000, C420S110000, C420S111000
Reexamination Certificate
active
06837945
ABSTRACT:
The invention concerns a steel article, which consists of an alloy having a chemical composition, which contains in weight-%: 1.2 to 2.5 C; 0.8 to 2.0 Si, which partly can be replaced by aluminium, which may exist in an amount of max 1.0%; 0.1 to 1.5 Mn; 0.5 to 1.5 Cr; 1.2 to 5.0 (V+Nb/2), however max 1.0 Nb; balance iron and impurities in normal amounts, and having a microstructure which contains 4 to 12 volume-% of MC-carbides. The steel article can be used for manufacturing of cold-work tools, particularly pilger rolls for cold rolling of tubes. The invention also relates to a method of manufacturing the article.
REFERENCES:
patent: 5106576 (1992-04-01), Noda et al.
patent: 5738734 (1998-04-01), Sawa et al.
patent: 1 587 843 (1977-06-01), None
Copy of International Search Report JP 57108248 A (Kanto Tokushu Seiko KK) Jul. 6, 1992 (Abstract) World Patents Index (Online). London, U.K.: Derwent Publications Ltd. (Retrieved on Aug. 8, 2000). Retrieved From: EPO WPI Database DW198232, Accession No. 192-67263.
JP57108248 (Kanto Tokushu Seikou KK) Oct. 6, 1982 (Abstract), (Online) Retrieved On Aug. 8, 2000 Retrieved rom: EPO PAJ Database.
Rydell Bo
Sandberg Odd
Ip Sikyin
Nixon & Vanderhye
Uddeholm Tooling Aktiebolag
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