Process for manufacturing modified type infinity chill hardening compound cast iron roll of nichrome molybdenum

Abstract

The invention relates to the technical field of a method for manufacturing composite grain rolls, in particular relates to the method for manufacturing modified-type chromium-nickel-molybdenum indefinite chilling composite grain rolls, which comprises raw material preparation, hot metal melting and modification treatment, frock preparation of roll neck die, cooling unpacking, heat treatment, and inspection of process. The method comprises firstly, smelting respectively outer-layer melted iron and nodular graphite cast iron which is on a core-portion after preparing raw materials, adding strengthening carbide to form elements M and N when the outer-layer melted iron is smelted, and forming the melted iron of chromium-nickel-molybdenum iron which is carbonized and strengthened, secondly, deteriorate-treating the melted iron of chromium-nickel-molybdenum iron which is carbonized and strengthened, and globalizing and inoculating the melted iron of the nodular graphite cast iron on the which is the a core-portion, thirdly, casting the outer layer of the melted iron of the chromium-nickel-molybdenum iron which is carbonized and strengthened with a centrifugal pressure casting method, and box-combining with rolling dies which are prepared by carpenters, and fourthly, re-casting the melted iron of nodular graphite cast iron with a static state casting method. The millimeter rolled steel quantity of rolls of the invention can be increased by over 20% compared with traditional chromium-nickel-molybdenum indefinite chilling composite grain rolls.

Description

technical field [0001] The invention relates to the technical field of manufacturing methods of composite cast iron rolls, in particular to a manufacturing method of an improved nickel-chromium-molybdenum infinitely chilled composite cast iron roll. Background technique [0002] The traditional nickel-chromium-molybdenum infinite chilled composite cast iron rolls used on the finish rolling stand of hot-rolled strip steel have low wear resistance, which cannot well meet the requirements of hot-rolled strip steel manufacturers for roll wear resistance. Short, the dimensional accuracy of the hot-rolled strip steel plate is poor, and the surface roughness is not good. Therefore must be improved. Contents of the invention [0003] The object of the present invention is to provide a method for manufacturing an improved nickel-chromium-molybdenum infinite chilled composite cast iron roll with good wear resistance. [0004] The purpose of the present invention is achieved throug...

AI Technical Summary

Problems solved by technology

[0002] The traditional nickel-chromium-molybdenum infinite chilled composite cast iron rolls used on the finish rolling stand of hot-rolled strip steel have low wear resistance and cann