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Centrifugal cast high-speed steel roll manufacture

A technology of centrifugal casting and manufacturing method, which is applied in the fields of centrifugal casting high-speed steel roll manufacturing and metallurgical roll manufacturing. It can solve the problems that segregation is difficult to completely eliminate, and achieve the effects of inhibiting gravity segregation, slowing down radial movement, and preventing casting cracks

Inactive Publication Date: 2003-09-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The W content in high-speed steel rolls is also controlled at a low level, and Nb is not added to high-speed steel, so segregation is difficult to completely eliminate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] During the casting and solidification process of the high-speed steel roll body, an electromagnetic field is added to the mold, and the magnetic induction intensity of the electromagnetic field is 0.08T. The addition of an electromagnetic field during centrifugal casting of high-speed steel rolls can suppress the gravitational segregation of elements, because the tangential component of the electromagnetic force reduces the circumferential motion of the metal melt, thereby slowing down the radial motion of atomic clusters. Casting cracks are very easy to occur during centrifugal casting of high-speed steel rolls. Thin coating and strong chilling are the main reasons for cracks. However, the thickness of the mold coating is too thick, and the coating layer is prone to cracking and peeling. The mold casting the high-speed steel roll adopts a double-layer coating, the bottom layer is an insulating layer, the surface layer is a refractory layer, and the thickness of t...

Embodiment 2

[0064]During the casting and solidification process of the high-speed steel roll body, an electromagnetic field is added to the mold, and the magnetic induction intensity of the electromagnetic field is 0.10T. The addition of an electromagnetic field during centrifugal casting of high-speed steel rolls can suppress the gravitational segregation of elements, because the tangential component of the electromagnetic force reduces the circumferential motion of the metal melt, thereby slowing down the radial motion of atomic clusters. Casting cracks are very easy to occur in centrifugal casting of high-speed steel rolls, and the main reasons for cracks are the thin thickness of the mold coating and strong chilling. However, the thickness of the mold coating is too thick, and the coating layer is prone to peeling and cracking. The mold casting the high-speed steel roll adopts a double-layer coating, the bottom layer is an insulating layer, the surface layer is a refractory laye...

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Abstract

A centrifugal casting technology for manufacturing roller of high-speed steel, which is composed of the roller body made of high-C high-W high-speed steel and the core made of cast iron, includes such steps as pouring the molten high-speed steel in the rotating mould of centrifugal machine, applying an electromagnetic field in the pouring and solidifying procedure, adding protecting agnet to the inner surface of roller body, pouring molten iron, cooling to lower than 100 deg.C, demoulding, coarse machining, quenching, tempering, and fine machining. Its advantages are high uniformity without segregation, and compact structure.

Description

1. Technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a method for manufacturing metallurgical rolls, in particular to a method for manufacturing centrifugally cast high-speed steel rolls. 2. Background technology [0002] In recent years, hot rolling technology has made great progress, and in terms of hot rolling rolls, high-performance high-speed steel rolls are also being developed. The outer layer of the high-speed steel roll is based on the addition of C content to ordinary high-speed steel, and a large amount of V and W are added at the same time to generate more high-hardness V carbides and W carbides, thereby obtaining high wear resistance. Centrifugal casting roll production method and continuous casting composite method (Chinese invention patent CN1280042), electroslag remelting method (US patent US5081760, Chinese invention patent CN1157192), spray deposition forming method and hot isostatic pressing method (Japane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D13/02B22D19/16
Inventor 符寒光刑建东
Owner XI AN JIAOTONG UNIV
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