Roll for hot rolling having enhanced abrasion resistance and reduced carbide segregation
CA 2228488 C · Owner: Toyooka, Takaaki · Inventors: Toyooka, Takaaki; Koseki, Tomoya; Yuda, Kohji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
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.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 16, 1997 and granted December 18, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 16, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.