Roll for hot rolling with increased resistance to thermal cracking and wear

US5902942A · kind A · utility

Assignee

• SANDVIK AB · SE

Inventors

• Carl-Johan Maderud · Stockholm, SE
• Thomas Ericson · Stuvsta-Snättringe, SE
• Udo Fischer · Sundbyberg, SE

Key dates

• Filing date: Jun 30, 1997
• Grant date: May 11, 1999
• Expiry date: Jun 30, 2017

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22F2998/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

There is now provided a roll for hot rolling comprising 70-95 weight %, preferably 85-94 weight %, WC in a binder phase consisting of only cobalt or alternatively a Co--Ni--Cr alloy containing 20-35 weight % Ni and up to 10 weight % Cr, possibly with small additions of molybdenum. The WC grains are rounded with an average grain size between 3-10 .mu.m, preferably 4-8 .mu.m. The maximum grain size should not exceed 2 times the average grain size and no more than 2% of the grains be less than half of the average grain size.