Cast high-speed steel rolls: a major achievement in the development of rolls in the world

At the end of the 20th century, the rise of cast high-speed steel rolls became a major event in the history of roll development in the world, because it surpassed high-chromium cast iron and high-chromium steel rolls at an extremely fast speed and quickly occupied most of the market. For many years, generations of roll makers have tried to make the carbides in the roll structure dispersed and isolated. The successful development of high-speed steel rolls has made this dream come true, and the traditional Fe3C (M3C) and M7C3 carbonization materials are changed into MCM2C and M6C carbides with better performance, which greatly improves the comprehensive performance of the working layer of the roll.

 

Cast high-speed steel rolls

 

Since the 1990s, the world’s roll development has achieved the most eye-catching and huge economic benefit achievement is the successful development of cast high-speed steel series rolls.

One is that cast high-speed steel rolls are used on the finish rolling front frame of hot strip tandem rolling mills, and their service life is three times that of high-chromium cast iron rolls. Japan uses high-speed steel rolls in almost all hot strip continuous rolling and finishing front stands, and European and American countries also use high-speed steel rolls in large quantities in these rolling mills. With the further improvement of the material and performance of high-speed steel rolls, high-speed steel rolls are advancing from the finishing front stand to the rear stand of the hot strip tandem mill to replace high-nickel-chromium infinite chilled composite rolls.

The second is the application of cast semi-high-speed steel rolls in hot strip roughing mills. The service life of cast semi-high-speed steel rolls is 3 to 4 times higher than that of cast semi-steel rolls, and 1.5 to 2.5 times higher than high-chromium steel rolls. Shape and surface quality are improved.

The 1%Cr cast high-speed steel rolls produced by the CPC method are used on the first and third stands of the cold strip continuous rolling mill after quenching and high-temperature tempering, and the service life is several times longer than that of the 5% Cr forged steel cold-rolled work rolls. times.

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