Centrifugal composite modified indefinite chilled cast iron roller and preparation method thereof

Abstract

The invention relates to a centrifugal combined indefinite chill cast-iron roller and a preparation method thereof, pertaining to steel rolling technical field. The chemical composition of a roll barrel is (weight percent): 3.2-3.8 C, 3.8-4.5 Ni, 1.2-1.8 Cr, 0.2-0.4 Mo, 0.2-0.5Cu, 1.0-1.8 Si, <0.8Mn, 0.10-0.30 Nb, 0.05-0.20 V, 0.05-0.20 Ti, 0.04-0.07Mg, 0.02-0.05 Y, 0.01-0.03 Sb, and the rest are Fe and unavoidable microimpurity. The invention employs a electric stove to produce a roller, and the roller is moulded with centrifugal casting method; the roller is characterized by high strength and hardness, good toughness, hardness uniformity and hardenability, excellent wear resistance and oxidation resistance and the anti-cold shock and heat shock properties are also good; no phenomena like breaking, peeling, crazing and steel sticking are in the operation process; the service performance is apparently better than high nickel-chrome indefinite chill cast-iron roller; the processing technique is simple, high-heat treatment is not needed and the production cost is low. The invented roll has the advantages that: the rolling mill operating rate is significantly improved, the production cost of mill bar is reduced, the surface quality of the mill bar is improved and the economic and social benefits are good.

Description

technical field [0001] The invention relates to hot rolls of various rolling mills and a manufacturing method thereof, in particular to a centrifugal composite improved infinitely chilled cast iron roll and a preparation method thereof, belonging to the technical field of steel rolling. Background technique [0002] The roll is the main consumable spare part in steel rolling production, and the quality of the roll is directly related to the productivity of steel rolling, the surface quality of the rolled material and the production cost of the rolled material. At present, the widely used roll materials mainly include high-chromium cast iron rolls, high-speed steel rolls and infinitely chilled cast iron rolls. Among them, high-speed steel rolls contain a lot of precious alloys and high production costs; high-chromium cast iron rolls need high-temperature quenching treatment, and the production cycle is long. , high energy consumption. The infinitely chilled cast iron roll do...

AI Technical Summary

Problems solved by technology

However, after part of the boron dissolves into the matrix, the brittleness of the matrix will be increased, and the failure of the roll will be aggravated.

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