CN105349900A - Preparation process for steel-cast supporting roller - Google Patents

Abstract

The invention discloses a preparation process for a steel-cast supporting roller. A supporting roller working layer is made of high-alloy steel, and a roller core part is made of graphitic steel. The high-alloy steel of the roller working layer comprises, by weight, 0.5-0.6% of C, 0.5-0.6% of Si, 0.5-0.6% of Mn, 4.5-5.5% of Cr, 1.1-1.2% of Ni, 0.7-0.8% of Mo, 0.04-0.08% of Re,0-0.03% of P, 0-0.03% of S and the balance Fe; the graphitic steel of the roller core part comprises, by weight, 1.5-1.6% of C, 1.8-1.9% of Si, 0.5-0.6% of Mn, 0.6-0.7% of Ni, less than 0.2% of Cr, less than 0.3% of Mo, less than 0.03% of P, less than 0.03% of S, and the balance Fe. The roller working layer of the steel-cast supporting roller manufactured by means of the preparation process is good in abrasion resistance and toughness, high in anti-accident ability and long in service life, and accordingly the manufacturing cost of the roller is reduced.

Description

A kind of configuration technique of cast steel back-up roller

Technical field

The present invention relates to a kind of configuration technique of cast steel back-up roller.

Background technology

The quality of roll quality not only affects the surface quality of stocking, but also affects the operating rate of milling train, directly governs the economic benefit of enterprise.In existing production technology, the back up roll that these milling trains use adopts cast-in-block alloy half steel roll usually, and alloy part cast steel roll, forged steel roll and compound semisteel roll.The common problem that back up roll in use exists is roll surface crackle, peels off and fall the destructive damages such as shoulder, according to statistics, the consumption causing this abnormalities to damage every year accounts for more than 40% of whole back up roll consumption, causes very large impact to the economic benefit of enterprise.Occur that the major cause of these problems is existing back up roll materials because alloy content is low, matrix is thick, anti-contact fatigue strength is low, poor toughness, under being in use subject to the effect of alternation repeatedly of the powerful rolling pressure of milling train and working roll recurvation power, the fatigue stress that roll surface is subject to and shear-stress cause crackle, peel off and fall the destructive damages such as shoulder beyond the breakdown point of material.Although patent application: " a kind of high-alloy centrifugal compound cast steel supporting roll and the manufacture method thereof " set forth in 200910001054.9 is feasible selecting of roll working layer, but, the weak point of this invention technology is that core of the roll tensile strength is low on the one hand, in use easily occurs roll breakage; Be that this invention technology member rate in implementation process is low on the other hand, thus increase the manufacturing cost of roll, reduce the competitiveness of product in market.

Summary of the invention

The object of this invention is to provide a kind of configuration technique of cast steel back-up roller.

The technical solution used in the present invention is: a kind of configuration technique of cast steel back-up roller, and described back up roll working layer adopts high quality steel, and core of the roll material adopts graphitized steel; Roll working lining high quality steel and core of the roll graphitized steel are complete metallurgical binding, the chemical component weight percentage ratio of described high quality steel is: C0.5-0.6%, Si0.5-0.6%, Mn0.5-0.6%, Cr4.5-5.5%, Ni1.1-1.2%, Mo0.7-0.8%, Re0.04-0.08%, P≤0.03%, S≤0.03%, surplus is Fe;

The chemical component weight percentage ratio of described graphitized steel is: C1.5-1.6%, Si1.8-1.9%, Mn0.5-0.6%, Ni0.6-0.7%, Cr < 0.2%, Mo < 0.3%, P < 0.03%, S < 0.03%, surplus is Fe.

The invention has the beneficial effects as follows: adopt the cast steel back-up roller that the technology of the present invention manufactures, because roll working layer adopts high quality steel, roll working lining wear resistance and good toughness, anti-accident ability are strong, long service life, because core of the roll material adopts graphitized steel, avoid molten ductile cast iron due to high temperature tap a blast furnace, high temperature cast usually causes roll abnormal nodularizing and in conjunction with bad and serious consequence that is that scrap, thus reduces roll manufacturing cost.

Embodiment

Embodiment:

A configuration technique for cast steel back-up roller, described back up roll working layer adopts high quality steel, and core of the roll material adopts graphitized steel; Roll working lining high quality steel and core of the roll graphitized steel are complete metallurgical binding; It is characterized in that:

The chemical component weight percentage ratio of described high quality steel is: C0.5-0.6%, Si0.5-0.6%, Mn0.5-0.6%, Cr4.5-5.5%, Ni1.1-1.2%, Mo0.7-0.8%, Re0.04-0.08%, P≤0.03%, S≤0.03%, and surplus is Fe;

The chemical component weight percentage ratio of described graphitized steel is: C1.5-1.6%, Si1.8-1.9%, Mn0.5-0.6%, Ni0.6-0.7%, Cr < 0.2%, Mo < 0.3%, P < 0.03%, S < 0.03%, surplus is Fe.

Above embodiments of the present invention are described, but the invention is not restricted to above-mentioned embodiment, in the ken that art those of ordinary skill possesses, can also make a variety of changes under the prerequisite not departing from present inventive concept.

Claims (1)

1. a configuration technique for cast steel back-up roller, described back up roll working layer adopts high quality steel, and core of the roll material adopts graphitized steel; Roll working lining high quality steel and core of the roll graphitized steel are complete metallurgical binding; It is characterized in that:

The chemical component weight percentage ratio of described high quality steel is: C0.5-0.6%, Si0.5-0.6%, Mn0.5-0.6%, Cr4.5-5.5%, Ni1.1-1.2%, Mo0.7-0.8%, Re0.04-0.08%, P≤0.03%, S≤0.03%, and surplus is Fe;

The chemical component weight percentage ratio of described graphitized steel is: C1.5-1.6%, Si1.8-1.9%, Mn0.5-0.6%, Ni0.6-0.7%, Cr < 0.2%, Mo < 0.3%, P < 0.03%, S < 0.03%, surplus is Fe.