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Large forged alloy steel backup roll sleeve and manufacturing method thereof

A technology of alloy steel and back-up rolls, which is applied in the field of roll sleeves and its manufacture, can solve the problems of limited use and inability to meet the requirements of large-scale back-up rolls, and achieve comprehensive performance improvement, good heat treatment process performance, and prevention of temper brittleness Effect

Active Publication Date: 2017-03-22
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the back-up roll sleeves are produced with conventional materials and processes in the manufacturing process. Conventional forged roll sleeves have limited use in the production of back-up rolls, and can only be used to manufacture some small back-up rolls for general purposes, which cannot meet the use requirements of large-scale back-up rolls.

Method used

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  • Large forged alloy steel backup roll sleeve and manufacturing method thereof

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Comparison scheme
Effect test

Embodiment 1

[0032] A large-scale forged alloy steel back-up roll sleeve, the design target of the chemical composition and mass percentage content of the roll sleeve is: C 0.45-0.55%, Si 0.50-0.70%, Mn 0.60-0.80%, Cr 4.80- 5.80%, Mo 0.80~1.20%, V0.20~0.30%, Ni≤0.4%, P≤0.02%, S≤0.02%, and the rest are Fe and unavoidable impurities.

[0033] The manufacturing method of described roller sleeve comprises the following process steps:

[0034] A. Refining steel ingots

[0035] The required raw materials are initially smelted in an electric arc furnace. After the smelting is completed, the molten steel is placed in an LF refining furnace to start refining the molten steel. The LF refining temperature is 1600-1800 °C and the refining time is 6 hours. After the molten steel is refined, it is poured into steel ingots in the form of die casting.

[0036] The chemical composition of the steel ingot was analyzed, and the chemical composition and mass percentage of the steel ingot were: C 0.51%, Si 0...

Embodiment 2

[0045] The process steps in embodiment 2 are the same as the process steps in embodiment 1, and the difference with embodiment 1 is: the design target of the chemical composition and mass percentage content of the large forged alloy steel backup roll sleeve in the present embodiment is :

[0046] C 0.40~0.50%, Si 0.50~0.70%, Mn 0.60~0.80%, Cr 4.80~5.80%, Mo0.80~1.20%, V 0.20~0.30%, Ni≤0.4%, P≤0.02%, S≤0.02 %, the rest is Fe and unavoidable impurities.

[0047] After analyzing the chemical composition of the steel ingot, the chemical composition and its mass percentage in the steel ingot are: C0.45%, Si 0.65%, Mn 0.7%, Cr 4.8%, Mo 1.2%, V 0.25%, Ni 0.2% , P 0.014%, S 0.009%, and the rest are Fe and unavoidable impurities.

[0048] The quenching temperature in step D is 1030°C, and the quenching time is 0.6h; the primary tempering temperature is 550°C, and the primary tempering holding time is 10h; the secondary tempering temperature is 530°C, and the secondary tempering holdi...

Embodiment 3

[0050] The process step in embodiment 3 is the same as the process step in embodiment 1, and the difference with embodiment 1 is: the design target of the chemical composition and mass percentage content of the large forged alloy steel backup roll sleeve in the present embodiment is :

[0051] C 0.40~0.50%, Si 0.50~0.70%, Mn 0.60~0.80%, Cr 4.8~5.80%, Mo 0.20~0.6%, V 0.08~0.12%, Ni≤0.4%, P≤0.02%, S≤0.02% , and the rest are Fe and unavoidable impurities.

[0052] After analyzing the chemical composition of the steel ingot, the chemical composition and mass percentage of the steel ingot are: C 0.48%, Si 0.57%, Mn 0.62%, Cr 4.8%, Mo 0.3%, V 0.09%, Ni 0.4% , P 0.01%, S 0.009%, and the rest are Fe and unavoidable impurities.

[0053] The quenching temperature in step D is 980°C, and the quenching time is 0.4h; the primary tempering temperature is 480°C, and the primary tempering holding time is 12h; the secondary tempering temperature is 500°C, and the secondary tempering holding ...

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Abstract

The invention discloses a roller sleeve for large forged alloy steel carrying roller and a manufacturing method thereof. The roller sleeve for large forged alloy steel carrying roller comprises following chemical constituents in percentage by mass: 0.40-0.80% of C, 0.20-1.20% of Si, 0.20-1.00% of Mn, 3.00-8.00% of Cr, 0.15-1.50% of Mo, 0.05-0.40% of V, Ni<=0.80%, P<=0.02%, S<=0.02% and the balance of Fe and ineluctable impurities. The manufacturing method for the roller sleeve for large forged alloy steel carrying roller comprises four steps, including refining steel ingot, forging roller sleeve base, pre-heating and machining and final heat treatment. The product of the invention is excellent in anti-contact fatigue performance, abrasion performance and roller shape retention, so that a complex carrying roller can satisfy rolling requirements of high-accuracy plates. According to the invention, the complex carrying roller obviously precedes conventional carrying rollers in contact-fatigue performance, roller shape retention and anti-mechanical and anti-thermal impact performances, and has especially excellent performance when being used as a sleeve for a convexity-changeable complex carrying roller.

Description

technical field [0001] The invention relates to a roller sleeve and a manufacturing method thereof, in particular to a large forged alloy steel backup roller sleeve and a manufacturing method thereof. Background technique [0002] As an important tool in the steel rolling industry, the roll is the most important consumable part of the steel rolling equipment. The large forged steel back-up roll is a tool that applies huge pressure to the roll body and transmits the rolling force to the rolled piece through the roll neck of the back-up roll. Back-up rolls have to bear a lot of rolling stress during the working process, plus problems such as weld seams, inclusions, edge cracks, and broken strips of the rolled pieces. Severe, large contact stress, so that the back-up roller is subject to huge fatigue contact stress, which is easy to cause cracks, sticking, peeling or even scrapping. Because the forged steel back-up roll is under great stress during the working process, the su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/46C22C38/24C21D8/10
CPCC21D8/105C22C38/02C22C38/04C22C38/44C22C38/46
Inventor 杨昱东刘娣朱学刚苏军新
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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