| 摘要 |
PURPOSE:To provide the titled rolling roll which exhibits excellent resistance to wear at and under a high temp. and high load and prevents exfoliation of plating layers by providing successively a nickel plating layer, nickel-phosphorus alloy plating layer and chromium plating layer respectively having adequate thicknesses to the surface of the roll. CONSTITUTION:A nickle plating layer 2 having high adhesion strength, xcellent resistance to heat and not so much high hardness, a nickel-phosphorus alloy plating layer 3 having excellent resistance to heat and chromium plating layer 4 having high hardness are successively provided onto a roll base body 1 such as a hardness are successively provided onto a roll base body 1 such as a hardened roll made of a forged roll, etc. The thickness of the plating layers 2-4 are made respectively >=10mum and the total thickness of 3 kinds of the plating layers is made 30-150mum. The three-layer plated hot rolling roll having excellent resistance to wear and exfoliation is thus obtd. The rolling roll constituted in the above-mentioned way is preferably heat-treated further at about 300-800 deg.C in a non-oxidative atmosphere to form diffusion layers 5, 6, 7 on the body 1 and between the layers 2-4 to increase the adhesion. It is also possible to improve further the resistance to wear by forming a chromium oxide film layer 8 on the layer 4 by a heat treatment. |
