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-resistant material for steel straightening rolls, the chemical composition of which is: C: 2.9-3.7%, Si: 0.6-1.2%, Mn: 0.4-1.2%, Cr : 0.6-1.2%, Ni ≤ 0.05%, Mo ≤ 0.03%; there are anti-spheroidizing elements B, Ti, Sb: 0.3%, and the ratio range is 8.5-11.7: 3.8-5.3: 0.9-1.1; the balance For Fe and inevitable P, S trace elements. The wear-resistant material of the present invention is mainly used for metal mold centrifugally cast steel straightening rolls. Due to the use of anti-spheroidizing elements B, Ti, and Sb, the white area of ​​cast iron is expanded to a depth of more than 20 mm, and the working surface of the roll body The hardness is as high as HRc55-65. After being used at the production site, the comprehensive steel passing amount (service life) is not lower than the life of the nickel-chromium-molybdenum infinite chilled cast iron straightening rollers commonly used, thereby effectively reducing the cost of producing section steel.

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

Images