High-speed steel rolls Development and production status

　　High-speed steel rolls are hot rolling roll materials with a shorter history, faster development, and broader application prospects. High-speed steel, also known as wind steel or sharp steel, means that it can be hardened even when cooled in air during quenching, and it is very sharp. It is a complex alloy steel containing carbide-forming elements such as tungsten, molybdenum, chromium, and vanadium. The total amount of alloying elements is about 10%~25%. The application of high-speed steel rolls is an important part of the development of modern steel rolling production. This is another major change in the development of the steel industry following micro-alloying, controlled rolling, and cooling technologies. In Japan, high-speed steel rolls have been widely used in the steel rolling production of plates, profiles, bars, and wires, and are used not only for work rolls but also for support rolls. The good wear resistance of high-speed steel rolls is inseparable from its characteristics that are different from traditional rolls.

　　The unit price of high-speed steel rolls is indeed higher than that of high-boron and high-nickel chromium rolls, but due to material properties, the steel throughput capacity of high-speed steel rolls is much higher than that of high-boron and high-nickel chromium rolls. For example, for 12 quarter-cut threaded steel bars, the steel throughput capacity of high-speed steel K1 single groove is 350 tons, while high-boron is only 150 tons, and high-nickel chromium is only 100 tons; the steel output of high-speed steel K3 single-group cans is 2800 tons, while high-boron is only 1100 tons, and high-nickel chromium is only 600 tons. In addition, high-speed steel has good hardness and wear resistance, low heavy load, and therefore a much longer service life than high-boron and high-nickel chromium rolls.

　　 High-speed steel rolls Advantage analysis 1: The per-ton steel roll consumption of high-speed steel rolls is much lower than that of high-boron and high-nickel chromium rolls; the annual procurement cost of high-speed steel rolls is much lower than that of high-boron and high-nickel chromium rolls. Advantage analysis 2: The steel throughput capacity of high-speed steel rolls is 2-4 times that of high-boron and high-nickel chromium rolls, which means that the number of roll changes for high-speed steel rolls is much lower than that of high-boron and high-nickel chromium rolls. In this way, using high-speed steel rolls will improve the continuous operation time of the production line. Compared with high-boron and high-nickel chromium rolls, the annual rolling output will increase by 2%-4%.

　　In the mid-1990s, centrifugal casting high-speed steel rolls were developed in China for the first time and successfully applied to hot-rolled narrow strip steel rolling mills, and then successfully applied to bar mills, high-speed wire mills, and spring flat steel mills. This technology was granted a national invention patent in 2001, and the centrifugal casting High-speed steel rolls ring also obtained a national invention patent in 2005.