The roughing stand roll ring of the section steel universal rolling mill mainly considers the resistance to hot cracking and the prevention of steel adhesion. For this reason, the number, shape and distribution of carbides in the structure of the roughing stand roll ring should be strictly controlled.
Compared with the horizontal roll ring of the universal roughing stand, the roll ring of the finishing rolling stand requires wear resistance and roughening resistance. The rollers of the assembly rollers can be made of forged steel with good strength and toughness, usually forged steel 42CrMo or 60CrMnMo.
Roller rings can be made of materials with high wear resistance, such as semi-steel and pearlite ductile iron materials used in the early days and recently developed high-carbon and high-alloy semi-steel, high-carbon graphite steel and other materials. Chapter 4 High-speed Railways and Rails Produced by centrifugal composite casting process.
The inner material of the roll ring should be strong and tough enough to resist the superposition of several stresses such as hot loading stress, rolling stress and thermal stress. Graphite steel is a good choice as the inner material of the roll ring.
The use practice of several domestic universal rolling mill horizontal combination rolls shows that the centrifugal composite high-carbon semi-roller ring has been successful.
In order to further improve the surface quality of section steel and the operating rate of rolling mills, some domestic steel mills began to use universal horizontal roll rings made of centrifugal high-chromium cast iron two years ago. Centrifugal composite high-chromium cast steel and high-speed steel roll rings will be the future development of roll ring materials. mainstream.
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