Roll for hot rolling having enhanced abrasion resistance and...

Details Roll for hot rolling having enhanced abrasion resistance and... Roll for hot rolling having enhanced abrasion resistance and...

C - Chemistry, Metallurgy

22

C

C22C 38/36 (2006.01) B21B 27/00 (2006.01) B32B 15/01 (2006.01)

Patent

CA 2228488

The present invention provides a high-quality high-speed steel roll which is markedly excellent in abrasion resistance and free of carbide segregation even in the case of production by centrifugal casting of economical benefit. A hot-rolling roll is provided which is characterized in that the roll comprises an outer layer containing, by all weight ratios, C; 2.4 - 2.9%, Si; not more than 1%, Mn; not more than 1%, Cr; 12 - 18%, Mo; 3 - 9%, V; 3 - 8% and Nb; 0.5 - 4%, and meeting with the following equations (1) and (2) at one time, 0.27 <= Mo (%)/Cr (%) <= 0.7 ~(1) C (%) + 0.2.Cr (%) <= 6.2 ~~(2) the outer layer further containing as the balance Fe and unavoidable impurities.

L'invention concerne un cylindre acier haute vitesse de laminage à chaud avec un rendement élevé, qui possède une excellente résistance à l'abrasion et, en même temps, lorsqu'il est produit au moyen d'un procédé de coulée centrifuge rentable, ne provoque aucune ségrégation de carbure. Ce cylindre de laminage à chaud comporte une couche extérieure comprenant, sur une base en poids, C: 2,4 à 2,9 %, Si: pas plus de 1 %, Mn: pas plus de 1 %, Cr: 12 à 18 %, Mo: 3 à 9 %, V: 3 à 8 %, et Nb: 0,5 à 4 %, les constituants précités satisfaisant simultanément aux exigences représentées par les formules suivantes (1) 0,27 </= Mo (%)/Cr (%) DOLLAR m/F) 0.7 et (2) C (%) + 0,2.Cr (%) </= 6,2, le reste étant constitué de Fe et des impuretés inévitables.

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