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A centrifugal composite high-speed steel roll and its pouring method

A centrifugal composite, high-speed steel technology, applied in the direction of rolls, metal rolling, metal rolling, etc., to prevent spalling, improve thermal fatigue resistance and wear resistance, and prolong service life.

Inactive Publication Date: 2011-12-14
HAICHENG ZHONGXING HEAVY MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, studies have found that M 2 C-type carbides can prevent the expansion of thermal cracks. It was observed in the physical inspection that those perpendicular to M 2 The long hot cracks of the C carbide plate cannot pass through and continue to expand. The above interrelated factors must be fully considered in the alloy composition design of high-speed rolls.

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  • A centrifugal composite high-speed steel roll and its pouring method
  • A centrifugal composite high-speed steel roll and its pouring method

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with embodiment.

[0018] A pouring method for a centrifugal composite high-speed steel roll, comprising smelting, pouring, cooling and unpacking, and heat treatment, the working steps of which are as follows:

[0019] 1) Intermediate frequency furnace smelting, molten steel smelting of the intermediate transition layer, the melting temperature is 1500-1600°C, the chemical composition weight percentage of the intermediate transition layer is: C 1.0-2.4%, Si 0.4-1.5%, Mn 0.4-1.5%, P 0 ~0.1%, S 0~0.03%, Cr 0~0.2%, Ni1.0~2.0%, Mo0~0.2%, and the rest are Fe and unavoidable impurities.

[0020] The outer layer of high-speed steel is melted with molten steel at a melting temperature of 1500-1600°C. The weight percentage of chemical components is: C 1.8-2.6%, Cr 3-10%, Nb 0.2-1.0%, Mo 4-10%, V 5-10%, W 4-10%, Co 2-10%, and the rest are Fe and unavoidable impurities.

[0021] The core of ductile iron is smel...

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Abstract

The invention relates to the technical field of composite cast steel rolls, in particular to a centrifugal composite high-speed steel roll and its pouring method. The roll includes a high-speed steel outer layer, an intermediate transition layer, and a ductile iron core. The chemical composition of the high-speed steel outer layer The weight percentage is: C 1.8~2.6%, Cr 3~10%, Nb 0.2~1.0%, Mo 4~10%, V 5~10%, W4~10%, Co 2~10%, the rest is Fe and not To avoid impurities, the working steps are as follows: 1) smelting in intermediate frequency furnace; 2) metamorphic treatment; 3) centrifugal casting; 4) core casting; 5) heat treatment in trolley-type differential temperature furnace. Compared with the prior art, the beneficial effects of the present invention are: 1) The thermal fatigue resistance and wear resistance of the outer layer of the high-speed steel can be significantly improved. 2) The bonding strength of the outer layer of high-speed steel and the intermediate transition layer reaches more than 400Mpa to prevent the outer layer of high-speed steel from peeling off.

Description

technical field [0001] The invention relates to the technical field of composite cast steel rolls, in particular to a centrifugal composite high-speed steel roll and a pouring method thereof. Background technique [0002] High wear resistance is a remarkable characteristic of high-speed steel rolls. High-hardness carbides in the structure play a decisive role. In fact, the development of work roll materials in hot rolling mills is the change process of carbide types, area content and final hardness performance. m 7 C 3 , M 6 C.M 2 C. MC is four different types of carbides that exist in high-speed steel rolls. Through the analysis of their different micro-morphological characteristics and micro-hardness, it is obvious to increase the type of MC and reduce the type of M 7 C 3 , M 2 C-type carbides can achieve better wear resistance, but this idea is restricted by several factors: [0003] 1. Centrifugal casting method: V is the main forming element of MC carbide, since ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B27/02C22C38/36B22D13/02B22D19/16
Inventor 王相丰王生
Owner HAICHENG ZHONGXING HEAVY MACHINERY