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Centrifugal casting production method of high-boron high-speed steel composite roller

A composite roll and centrifugal casting technology, which is applied in the direction of rolls, metal rolling, and manufacturing tools, can solve the problems of low density, low hardness of the roll surface, and poor wear resistance, and achieve reduced production costs, uniform hardness, and wear resistance and good effect on thermal fatigue resistance

Inactive Publication Date: 2009-05-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high boron content in high-boron high-speed steel rolls, usually more than 1.0%, and the low density of boron, under ordinary centrifugal casting conditions, due to the centrifugal force, boron elements tend to segregate on the inner surface of the roll, while the outer surface of the roll (i.e. The boron content on the working surface of the roll is less, resulting in low hardness and poor wear resistance of the roll surface

Method used

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  • Centrifugal casting production method of high-boron high-speed steel composite roller
  • Centrifugal casting production method of high-boron high-speed steel composite roller
  • Centrifugal casting production method of high-boron high-speed steel composite roller

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Effect test

Embodiment 1

[0039] 1) Melting high-boron high-speed steel liquid:

[0040] ①Heating and melting ordinary steel scrap, pig iron, ferrochrome, ferrotungsten, nickel plate and ferromolybdenum, adding ferrosilicon for pre-deoxidation and alloying after molten steel is melted;

[0041] ② After adjusting the ingredients before the furnace, raise the temperature to 1520°C, add ferrovanadium, aluminum, ferrotitanium and ferroboron in sequence and raise the temperature. When the temperature of molten steel reaches 1580°C, it is out of the furnace;

[0042] ③Crush the rare earth ferrosilicon into small pieces with a particle size of 8-12mm, dry it at 200°C, place it at the bottom of the ladle, and use the method of pouring into the ladle to treat the molten steel with rare earth modification;

[0043] 2) Pretreatment of high boron high speed steel liquid before pouring:

[0044] like figure 1 As shown, when the temperature of the high-boron high-speed steel liquid reaches 70°C above the liquidus ...

Embodiment 2

[0057] 1) Melting high boron high speed steel liquid

[0058] ①Heating and melting ordinary steel scrap, recarburizer, ferrochrome, ferrotungsten, nickel plate and ferromolybdenum, adding ferrosilicon for pre-deoxidation and alloying after molten steel is melted;

[0059] ② After adjusting the composition before the furnace, the temperature is raised to 1540°C, and ferrovanadium, aluminum, ferrotitanium and ferroboron are added in sequence and the temperature is raised, and the molten steel is released when the temperature reaches 1560°C;

[0060] ③Crush the rare earth ferrosilicon into small pieces with a particle size of 8-12mm, dry it at 180°C, place it at the bottom of the ladle, and use the method of flushing into the ladle to perform rare earth modification on the molten steel;

[0061] 2) Pretreatment of high boron high speed steel liquid before pouring

[0062] like figure 1 As shown, when the temperature of the high-boron high-speed steel liquid reaches 60°C above t...

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Abstract

A manufacturing method for centrifugally casting high-boron high-speed steel composite roller belongs to the technical field of rolled steel. The invention aims to provide the manufacturing method for centrifugally casting the high boron high-speed steel composite roller without element segregation. The manufacturing method comprises the following steps: injecting high-seed steel liquid into a metal casting mould rotating at high speed on a centrifugal machine after the high-seed steel liquid is cooled by an inclined cooling plate; spaying, cooling and casting the high-seed steel liquid during a pouring process; and then centrifugally pouring an intermediate layer; finally pouring cast steel or alloyed ductile cast iron in a rolling core in a static state; and then obtaining the high-boron high-speed steel composite roller. The high-boron high-speed steel composite roller has the advantages of fine tissues on an external layer, compactness and no element segregation; and a boron element on the external layer cannot be mixed into a rolling core.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a method for manufacturing a centrifugally cast high-boron high-speed steel composite roll. Background technique [0002] On the basis of high-speed steel rolls, the boron content is increased, the carbon content is reduced, and the addition of expensive alloy elements tungsten, molybdenum, vanadium, niobium and nickel is reduced, and the high-boron high-speed steel roll material is developed without adding cobalt, which is scarce in my country. , has the characteristics of high hardness, good wear resistance, good fatigue resistance and high toughness. It is of great significance to reduce the production cost of rolls, improve the surface quality of rolled materials and prolong the service life of rolls when used in roll production. [0003] Chinese invention patent CN101240402 discloses a cast high-boron high-speed steel for composite roll ring and its heat tre...

Claims

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Application Information

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IPC IPC(8): B21B27/02C21C7/06C22C33/04B22D13/02C21D9/38
Inventor 符寒光蒋志强冯锡兰胡中艳雷永平邢建东成小乐
Owner BEIJING UNIV OF TECH
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