Low nickel-chrome-molybdenum alloy cast iron wear-resistant material for profiled bar straightening roller

Abstract

The invention provides a low nickel chromium molybdenum alloy cast iron wear resistanct material for profile steel straightener roll. The weight percentage of the chemical compositions of the material is as follows: 2.9 percent to 3.7 percent of C, 0.6 percent to 1.2 percent of Si, 0.4 percent to 1.2 percent of Mn, 0.6 percent to 1.2 percent of Cr, not more than 0.05 percent of Ni, not more than 0.03 percent of Mo and 0.3 percent of tension-active element B, Ti and Sb, the matching range of which is 8.5 to 11.7 : 3.8 to 5.3 : 0.9 to 1.1, remaining Fe, and unavoidable P and S microelement. The wear resistant material of the invention is mainly used for metal mould centrifugal pouring profile steel straightener roll. The cast iron white area is enlarged by adopting the tension-active element B, Ti and Sb; and the depth of the cast iron white area is more than 20mm; the hardness of the roller body work surface is more than HRc55 to 65. The summed steel passing quantity (service life) is not lower than the service life of the ordinarily adopted nickel chromium molybdenum indefinite hard iron straightener roll; therefore the cost of producing profile steel can be effectively reduced.

Description

technical field [0001] The invention relates to a low-nickel-chromium-molybdenum alloy cast iron wear-resistant material suitable for a steel rolling machine wear-resistant process piece-section steel straightening roll. Background technique [0002] Straightening rollers are indispensable wear-resistant process spare parts for section steel production. Its surface is processed into a certain pass shape. When straightening the steel, the pass surface is in direct contact with the profiled steel. Under the action of temperature and pressure, it bears rolling and sliding friction, and the wear is serious. At present, most of the steel straightening rollers in my country are made of nickel-chromium-molybdenum infinite chilled cast iron with a relatively high content. Due to the scarcity and high price of metal nickel resources in our country, the manufacturing cost of straightening rollers is relatively high, which restricts the reduction of the production cost of section stee...

AI Technical Summary

Problems solved by technology

Since the straightening roller needs to be reloaded once to change the type, the pursuit of an excessively high "one-time service life" is not in line with the actual production, so the above-mentioned patented products have not been popularized and used in my country's section steel straightening industry

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