Title:
TOOL FOR MOUNTING WORK ROLL
Document Type and Number:
Japanese Patent JP3542900
Kind Code:
B
Abstract:
PROBLEM TO BE SOLVED: To raise wear resistance, to reduce the number of repair by build-up and to reduce the cost of build-up material by executing the repair by build-up welding of the mounting hole of a work roll with a ferro alloy containing a specified composition of carbon and chromium and having a specified hardness.
SOLUTION: The wear of the hole of a spindle coupling for mounting the work rolls is mainly caused by fatigue peeling of an oval-shaped hole. As its countermeasure, the improvement of wear resistance by raising the hardness of the build-up welding or the like is effective and, for the sake of that, the repairing material for a buildup welding is to be improved. The build-up welding is executed with the ferro alloy containing 0.1-0.2 wt.% C and 11-15 wt.% Cr. The hardness of the build-up welding is defined as Shore hadness of 65-75. Preferable hardness is about 68-73. It is preferable that the repairing material for build-up welding is the ferro alloy further containing 2-3 wt.% Ni. When the wear is severe, after once removing the inside of the hole including the repairing material and, after executing the build-up welding and heat treatment, it is better to again finish the hole into a desired shape.
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Inventors:
Nitta, Hirofumi
Application Number:
JP1998000055085
Publication Date:
April 09, 2004
Filing Date:
March 06, 1998
Export Citation:
Assignee:
NIPPON STEEL CORP
International Classes:
B23K9/04; B21B35/14; B23K35/30; C22C38/00; C22C38/18; C22C38/40; B23K9/04; B21B35/00; B23K35/30; C22C38/00; C22C38/18; C22C38/40; (IPC1-7): B21B35/14; B23K9/04; B23K35/30