Steel cold work tool, its use and manufacturing

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/24 (2006.01) C22C 38/26 (2006.01) C22C 38/34 (2006.01) C22C 38/36 (2006.01) C21D 9/38 (2006.01)

Patent

CA 2369298

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.

Cette invention se rapporte à un article en acier, qui est constitué par un alliage ayant une composition contenant en poids: 1,2 à 2,5 % de C, 0,8 à 2,0 % de Si, qui peut être partiellement remplacé par de l'aluminium, pouvant être présent en une quantité de 1,0 % au maximum, 0,1 à 1,5 % de Mn, 0,5 à 1,5 de Cr, 1,2 à 5,0 % de (V + Nb/2), avec un maximum de 1,0 % de Nb, le reste étant constitué de fer et d'impuretés en quantités normales, et ayant une microstructure qui contient 4 à 12 % en volume de carbures MC. Cet article en acier peut être utilisé pour la fabrication d'outils d'écrouissage, notamment des cylindres de laminoir à pas de pèlerin pour l'écrouissage de tubes. Cette invention se rapporte également à un procédé de fabrication d'un tel article.

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