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Bi-metal composite high-vanadium high-speed steel roller sleeve for hot rolling

A high-speed steel and bimetal technology, applied in the direction of roll, metal rolling, metal rolling, etc., can solve the problems of poor heat treatment and segregation of the overall roll, and achieve the effect of easy segregation, uniform distribution, and difficulty in segregation.

Inactive Publication Date: 2019-06-18
HUNAN 3T NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a double-metal composite high-vanadium high-speed steel roll sleeve for hot rolling. By optimizing the alloy composition of the roll sleeve, the structure of the roll sleeve can be improved to improve its strength and other properties; and it can effectively solve the existing problems. There are problems such as centrifugal casting high-speed steel roll sleeves are prone to segregation, and the overall roll is not easy to heat treat

Method used

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  • Bi-metal composite high-vanadium high-speed steel roller sleeve for hot rolling

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preparation example Construction

[0056] The preparation method of the double-metal composite high-vanadium high-speed steel roll sleeve 100 for hot rolling comprising the following steps:

[0057] Step S1, melting molten steel according to the chemical composition of the wear-resistant layer of the above-mentioned high-vanadium high-speed steel;

[0058] In order to improve the quality of molten steel and improve the casting state, in the present invention, preferably, an appropriate amount of additives is added to molten steel for smelting. The addition of additives, on the one hand, is beneficial to adjust and control the content of easily oxidized elements and trace elements, which can greatly increase the alloy yield, reduce smelting costs, shorten smelting time, and precisely control the composition; on the other hand, it can play a role in pure steel liquid and partially change the nature and shape of inclusions.

[0059] When the temperature of the molten steel reaches 1620°C, the calcium-aluminum cor...

Embodiment 1

[0079] In the hot-rolling dual-metal composite high-vanadium high-speed steel roll sleeve of this embodiment, the outer high-speed steel wear-resistant layer is the working layer, and its outer diameter is Ф400mm; the inner low-carbon steel is 20# seamless steel pipe, and its outer diameter is Ф270mm, wall thickness is 35mm.

[0080] In this embodiment, the preparation process of the double-metal composite high-vanadium high-speed steel roll sleeve for hot rolling includes the following steps:

[0081] In step S1, the outer layer molten steel of the composite high-vanadium high-speed steel roller sleeve is first melted in an intermediate frequency induction furnace, and its chemical composition includes the following composition by weight percentage:

[0082] C: 2.1%, Si: 0.90%, Mn: 0.58%, S≤0.03%, P≤0.04%, V: 6%, Cr: 4.8%, Mo: 3.5%, Nb: 1.0%, Co: 2.0%, W: 0.8%, the balance is Fe and unavoidable impurities;

[0083] When the temperature of the above molten steel reaches 1620...

Embodiment 2

[0094] The hot-rolling double-metal composite high-vanadium high-speed steel roll sleeve of this embodiment is basically the same as that of Embodiment 1, except that:

[0095] (1) In the present embodiment, the alloy composition of the outer layer includes the following composition by weight percentage:

[0096] C: 1.8%, Si: 0.5%, Mn: 0.3%, S≤0.03%, P≤0.04%, V: 5%, Cr: 6%, Mo: 5%, Nb: 3%, Co: 4.0%, W: 0.5%, the balance is Fe and unavoidable impurities;

[0097] (2) In this embodiment, the preheating temperature of the seamless steel pipe is 700°C, and the molten steel casting temperature is 1620°C;

[0098] (3) In the present embodiment, the annealing process is as follows: slowly raise the temperature of the double-metal composite high-vanadium high-speed steel roller sleeve to 820 ° C, keep it warm for 8 hours, and then cool it in the furnace to normal temperature and take it out of the furnace;

[0099] The quenching process is as follows: slowly raise the temperature of...

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Abstract

The invention provides a bi-metal composite high-vanadium high-speed steel roller sleeve for hot rolling. The composite high-speed steel roller sleeve comprises an outer layer and an inner layer. Theouter layer is a high-vanadium high-speed steel wear-resisting layer, and comprises, by mass percentage, 1.8%-2.8% of C, 0.2%-1.0% of Si, 0.3%-0.8% of Mn, 4%-10% of V, 4%-8% of Cr, 3%-6% of Mo, 1.0%-4.0% of Nb, 2.0%-5.0% of Co, smaller than or equal to 1.0% of W, smaller than or equal to 0.03% of S, smaller than or equal to 0.04% of P and the balance Fe and inevitable impurities. According to thebi-metal composite high-vanadium high-speed steel roller sleeve for hot rolling, the alloy component of the roller sleeve is optimized, the organization structure of the roller sleeve is improved, andtherefore the performance such as the strength of the roller sleeve is improved. In addition, the problems that in the existing process of centrifugal casting of high-speed steel roller sleeves, segregation is prone to existing, and an integral roller is not prone to being subjected to thermal treatment can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a double-metal composite high-vanadium high-speed steel roll sleeve for hot rolling. Background technique [0002] Hot rolling is rolling above the recrystallization temperature. Compared with cold rolling, hot rolling has high metal plasticity and low deformation resistance, which greatly reduces the energy consumption of metal deformation. Hot rolling can improve the processing performance of metals and alloys, that is, the coarse grains in the casting state are broken, the cracks are significantly healed, the casting defects are reduced or eliminated, the as-cast structure is transformed into a deformed structure, and the processing performance of the alloy is improved. Therefore, in recent years, hot rolling technology has made great progress. [0003] The roll is an important part in steel rolling, which can cause the steel to undergo plastic deformation between th...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/30C22C38/36B21B27/03B22D19/16
Inventor 曾麟芳向勇李聚良胡勇黄玲谢昭昭
Owner HUNAN 3T NEW MATERIAL
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