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Cold rolling roller with ultra-deep hardening layer and manufacturing method of cold rolling roller

A manufacturing method and technology of cold rolling rolls, applied in the direction of rolls, metal rolling, manufacturing tools, etc., to achieve the effect of increasing service life

Inactive Publication Date: 2016-01-20
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is to reduce the consumption of rolls, and to obtain a hardened layer with a hardness of more than 90HSD and a depth of more than 45 mm by fine-tuning the composition and improving the manufacturing method of the conventional Cr5 material rolls.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of chemical composition and mass percentage content thereof in the material of a kind of cold roll with ultra-deep hardened layer of the present embodiment are: C0.91%, Si0.74%, Mn0.66%, Cr5.29%, Ni0 .45%, Mo0.51%, V0.11%, P0.014%, S0.004%, and the rest are Fe and unavoidable impurities.

[0027] The manufacturing method includes the following process steps:

[0028] A. Smelting: Use the common smelting method of Cr5 cold rolling roll to smelt the roll billet. Firstly, the raw material ratio is carried out according to the chemical composition and mass percentage content required by the cold rolling roll, and the electric furnace smelting + refining furnace refining and vacuum degassing + electroslag weight are used. The electroslag steel ingot is smelted by the molten smelting process; in addition to controlling the chemical composition of the steel, the more important thing is to control the cleanliness of the steel and reduce the segregation of alloy elements;...

Embodiment 2

[0037]The processing step in embodiment 2 is identical with the processing step in embodiment 1, and the difference with embodiment 1 is that the chemical composition and mass percentage content thereof of cold roll are C0.93%, Si0.67%, Mn0.77% , Cr5.15%, Ni0.38%, Mo0.55%, V0.1%, P0.014%, S0.003%, and the rest are Fe and unavoidable impurities.

[0038] Process steps of the manufacturing method:

[0039] The quenching and tempering treatment carried out in step B has a tempering temperature of 600° C. and a heat preservation time of 18 hours.

[0040] In the final heat treatment of step D, the induction quenching temperature is 940° C.; the holding time of the cold treatment is 2 hours; the tempering temperature is 120° C., and the holding time is 60 hours.

[0041] According to the hardness test, the surface hardness of the finally obtained cold roll is 93-97HSD, the hardness at the depth of 45mm is 90-91HSD, and the depth of the roll with the hardness value above 90HSD is 4...

Embodiment 3

[0043] The process step in embodiment 3 is identical with the process step in embodiment 1, and the difference with embodiment 1 is that the chemical composition and mass percentage content thereof of cold roll are C0.91%, Si0.75%, Mn0.75% , Cr5.18%, Ni0.42%, Mo0.54%, V0.12%, P0.01%, S0.009%, and the rest are Fe and unavoidable impurities.

[0044] Process steps of the manufacturing method:

[0045] The quenching and tempering treatment carried out in step B has a tempering temperature of 650° C. and a heat preservation time of 22 hours.

[0046] In the final heat treatment of step D, the induction quenching temperature is 930°C; the holding time for cold treatment is 4h; the tempering temperature is 120°C, and the holding time is 60h.

[0047] According to the hardness test, the surface hardness of the finally obtained cold roll is 92-95HSD, the hardness at the depth of 45mm is 90-91HSD, and the depth of the roll with the hardness value above 90HSD is 47mm.

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Abstract

The invention discloses a cold rolling roller with an ultra-deep hardening layer and a manufacturing method of the cold rolling roller. The cold rolling roller comprises, by mass, 0.85%-0.95% of C, 0.60%-0.80% of Si, 0.60%-0.80% of Mn, 4.80%-5.80% of Cr, 0.30%-0.50% of Ni, 0.40%-0.60% of Mo, 0.05%-0.15% of V, 0-0.015% of P, 0-0.015% of S, and the balance Fe and inevitable impurities. The manufacturing method of the cold rolling roller comprises the process steps of smelting quenching and tempering, finish heat treatment and the like. The surface hardness of the manufactured cold rolling roller is 92-99 HSD, the hardening layer with the hardness being over 90 HSD is over 45 mm in depth, and the cold rolling roller is provided with the ultra-deep hardening layer.

Description

technical field [0001] The invention relates to a cold rolling roll and a manufacturing method thereof, in particular to a cold rolling roll with an ultra-deep hardened layer and a manufacturing method thereof. Background technique [0002] With the development of cold rolling mills towards continuous, thin plate, high precision, and multiple varieties, higher requirements are put forward for the selection of cold rolling roll materials, smelting, forging and heat treatment. In order to reduce the consumption of rolling mills, the design of modern rolling mills requires deeper and deeper depths of the working layers of the rolls. The depth of the working layers of the rolls gradually increases from the usual 25-35mm. At present, there are more and more types of rolls with a depth of more than 40mm. The deepest requirement is quenching. The hard layer exceeds 50mm. Cr5 cold roll is a high-tech roll, which has high hardenability, good hardenability, high wear resistance and a...

Claims

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Application Information

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IPC IPC(8): C22C38/46C21D9/38C21D1/18C21D1/25B21B27/00
Inventor 杨昱东朱学刚苗金平崔聪聪苏军新孙满臣韩维国葛晓红高新生
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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