Roll surface layer material for hot rolling with excellent fatigue resistance produced by centrifugal casting, and composite roll for hot rolling produced through centrifugal casting

US9975158B2 · kind B2 · utility

Assignee

• JFE Steel Corporation · JP

Inventors

• Kenji Ichino · Handa, JP
• Tetsuo Mochida · Chita, JP
• Hiromitsu Shibata · Hamamatsu, JP

Key dates

• Filing date: Oct 15, 2012
• Grant date: May 22, 2018
• Expiry date: Feb 25, 2034

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49544
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

There is provided a roll surface layer material including a roll surface layer with excellent fatigue resistance. The roll surface layer material has a composition including, on a mass % basis, C: 2.3% to 2.9%, Si: 0.2% to 0.8%, Mn: 0.2% to 1.0%, Cr: 5.0% to 7.5%, Mo: 4.4% to 6.5%, V: 5.3% to 7.0%, Nb: 0.6% to 1.5%, and Co: 0.1% to 4.0% so as to satisfy 14.0≤(Mo+1.7V)≤17.0 (where Mo represents a content (mass %) of Mo and V represents a content (mass %) of V) and further including Al: 0.001% to 0.03% and/or REM: 0.001% to 0.03%, wherein a carbide is contained at an area fraction of 13% to 40%. A composite roll obtained by integrally welding a shaft member to the roll surface layer member is treated as a centrifugal cast roll that includes a surface layer with excellent fatigue resistance.