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Cold roll with thick quench-hardened layer and manufacturing method thereof

A manufacturing method and technology for cold rolling rolls, applied in the field of roll manufacturing, can solve the problems of additional round-trip transportation and re-quenching costs, increased roll turnover, high Cr alloy content, and achieve good metallurgical quality, high purity, and moderate grain size. Effect

Active Publication Date: 2016-02-10
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with Cr3 material, Cr5 material has high content of Cr alloy, serious composition segregation, difficult manufacturing, high production cost, and limited popularization and application.
The thickness of the hardened layer of ordinary Cr3 material is relatively shallow, generally below 30mm. For cold rolls with a working layer of more than 30mm, ordinary Cr3 material rolls need to be returned to the roll manufacturer for another surface quenching treatment after a certain diameter is used. To ensure the hardness requirements of the roll body, it is necessary to increase the turnover of the rolls, and add the cost of round-trip transportation and re-quenching, which increases the cost of the rolls

Method used

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  • Cold roll with thick quench-hardened layer and manufacturing method thereof
  • Cold roll with thick quench-hardened layer and manufacturing method thereof
  • Cold roll with thick quench-hardened layer and manufacturing method thereof

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Effect test

Embodiment 1

[0027] The manufacturing method of the cold roll with thick hardened layer of the present embodiment comprises the following steps,

[0028] 1) Prepare steel raw materials according to the chemical composition and weight percentage in the material of the cold roll, and prepare the roll blank according to the roll blank production process.

[0029] Specifically, steel raw materials are smelted in an electric arc furnace and LF / VD refining furnace, molded into electrode rods, annealed after demoulding, and then electroslag is remelted into electroslag ingots. The chemical composition and weight percentage of the ingot are tested. After the composition is qualified, the electroslag ingot is heated and forged into a forging billet. The forging billet is subjected to post-forging heat treatment, and finally turned to obtain a roll billet.

[0030] The annealing temperature of the electrode rod annealing treatment is 650°C, the annealing time is 15h, the heat treatment temperature a...

Embodiment 2

[0038] The cold rolling roll with thick hardened layer of the present embodiment, the weight percent composition of main chemical component in its material is through testing, and the content of main chemical component is shown in embodiment 2 column in table 1, and all the other are Fe and unavoidable impurities.

[0039] The manufacturing method of the cold rolling roll with thick hardened layer in this embodiment has similar process steps to that of embodiment 1, and the specific heat treatment parameters different from embodiment 1 are shown in column 2 of embodiment 2 in table 2.

[0040] After the above treatment, the cold rolling roll of this embodiment has a surface hardness of 95-96 HSD and a hardened layer thickness of 41 mm.

Embodiment 3

[0042] The cold rolling roll with thick hardened layer of the present embodiment, the weight percent composition of main chemical component in its material is through testing, and the content of main chemical component is shown in column 3 of embodiment in table 1, and all the other are Fe and unavoidable impurities.

[0043] The manufacturing method of the cold rolling roll with thick hardened layer in this embodiment has similar process steps to that of embodiment 1, and the specific heat treatment parameters different from embodiment 1 are shown in column 3 of embodiment 2 in table 2.

[0044] After the above treatment, the cold rolling roll of this embodiment has a surface hardness of 94-95 HSD and a hardened layer thickness of 43 mm.

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Abstract

The invention relates to a cold roll with a thick quench-hardened layer. Chemical constituents in materials of the cold roll include, by weight, 0.70-1.20% of C, 0.5-1.20% of Si, 0.60-1.00% of Mn, 2.50-4.00% of Cr, 0.20-1.00% of Mo, at most 0.30% of Ni, at most 0.015% of S, at most 0.015% of P and the balance Fe and unavoidable impurities. The thickness of the quench-hardened layer of the cold roll is increased, and secondary quenching for the cold roll during usage is avoided.

Description

technical field [0001] The invention relates to the technical field of roll manufacturing, in particular to a cold roll with a thick hardened layer and a manufacturing method thereof. Background technique [0002] With the increasing production level of modern cold rolling mills, the requirements for rolls are becoming increasingly stringent, and the thickness of the working layer of rolls is gradually increasing. In order to adapt to the development of cold rolling mills, the development trend of cold rolling materials is to increase the Cr content, from the initial Cr2 , Cr3 is developed to Cr5 material to increase the thickness of the hardened layer of the roll to meet the hardness requirements of the roll body throughout the service cycle of the roll and avoid re-quenching during use. Compared with the Cr3 material, the Cr5 material has a higher content of Cr alloy, serious composition segregation, more difficult manufacturing, higher manufacturing cost, and limited popu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/02C22C38/04C22C38/12C22C38/08C21D1/25C21D1/10C21D9/38
CPCC21D1/10C21D1/25C21D9/38C22C38/02C22C38/04C22C38/08C22C38/12C22C38/18Y02P10/25
Inventor 党坤会朱学刚
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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