Preparation method for hot rolling composite work roller with high speed steel on outer layer

A hot-rolled composite, high-speed steel technology, applied in the direction of rolls, metal rolling, metal rolling, etc., can solve the problems of reducing the service life of the rolls, low W content, and large differences in carbide densities. frequency, reducing production costs, and improving mechanical properties

Inactive Publication Date: 2014-05-21
WUXI XINSANZHOU STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the centrifugal method is a very mature composite roll manufacturing technology, it has the following disadvantages: (1) High-speed steel contains more alloying elements such as W, Cr, Mo, V, etc., and the density of these elements and the carbides formed is very different. Large, carbide segregation occurs under the action of centrifugal force, the outer layer has low V content, while the W and Mo contents are high, and the inner layer is just the opposite, which seriously affects the wear resistance of the roll
(2) High-carbon and high-vanadium high-speed steel produces MC pro-eutectic carbides during the crystallization process. Because its density is lower than that of molten steel, it is easy to segregate on the inner side of the working layer under the action of centrifugal force, resulting in a change in the friction coefficient during rolling. Cause steel product size out of tolerance
It uses the addition of Nb elements to increase the density of MC-type carbides, and limits the addition of high-density W elements. Although the segregation of carbides is effectively controlled, Nb elements increase the quenching temperature of steel. In addition, the Nb-based MC in the product Type carbides are coarser than MC carbides of V series, which causes the rolls to peel off easily during use; at the same time, the high-speed steel with low W content has poor red hardness, low high-temperature hardness, and poor high-temperature wear resistance, which reduces the service life of the rolls

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for preparing a hot-rolled composite work roll whose outer layer is high-speed steel, the chemical composition of the high-speed steel is composed of the following components in weight percentage: C: 2.1, Si: 0.4, Mn: 1.3, Cr: 8.4, Mo: 1.3, W: 6.2, V: 2.5, Co: 4.5, Ni: 2.1, B: 0.006, P<0.1, S<0.015; the rest is Fe and unavoidable impurities; the preparation method includes the following steps:

[0015] 1) To smelt the outer high-speed steel, use the induction furnace to smelt the high-speed steel according to the conventional process, adjust the tapping temperature to 1610°C and prepare for pouring;

[0016] 2) Use the prefabricated ball-milled cast iron roller core, place it vertically in the water-cooled casting mold, and pour the molten steel in step 1);

[0017] 3) The cast roll is subjected to quenching and tempering heat treatment after mechanical rough machining, and then mechanical finishing after heat treatment. The quenching temperature is 1020°C, the...

Embodiment 2

[0019] A method for preparing a hot-rolled composite work roll whose outer layer is high-speed steel, the chemical composition of the high-speed steel consists of the following components in weight percentage: C: 2.3, Si: 0.2, Mn: 1.5, Cr: 8.2, Mo: 1.5, W: 5.8, V: 3.5, Co: 3.5, Ni: 2.3, B: 0.004, P<0.1, S<0.015; the rest are Fe and unavoidable impurities; the preparation method includes the following steps:

[0020] 1) To smelt the outer high-speed steel, use the induction furnace to smelt the high-speed steel according to the conventional process, adjust the tapping temperature to 1630°C and prepare for pouring;

[0021] 2) Use the prefabricated ball-milled cast iron roller core, place it vertically in the water-cooled casting mold, and pour the molten steel in step 1);

[0022] 3) The cast roll is subjected to quenching and tempering heat treatment after mechanical rough machining, and then mechanical finishing after heat treatment. The quenching temperature is 1040°C, the t...

Embodiment 3

[0024] A method for preparing a hot-rolled composite work roll whose outer layer is high-speed steel, the chemical composition of the high-speed steel is composed of the following components in weight percentage: C: 2.2, Si: 0.3, Mn: 1.4, Cr: 8.3, Mo: 1.4, W: 6.0, V: 3.0, Co: 4.0, Ni: 2.2, B: 0.005, P<0.1, S<0.015; the rest are Fe and unavoidable impurities; the preparation method includes the following steps:

[0025] 1) To smelt the outer high-speed steel, use an induction furnace to smelt the high-speed steel according to the conventional process, adjust the tapping temperature to 1620°C and prepare for pouring;

[0026] 2) Use the prefabricated ball-milled cast iron roller core, place it vertically in the water-cooled casting mold, and pour the molten steel in step 1);

[0027] 3) The cast roll is subjected to quenching and tempering heat treatment after mechanical rough machining, and then mechanical finishing after heat treatment. The quenching temperature is 1030°C, the...

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PUM

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Abstract

The present invention discloses a preparation method for a hot rolling composite work roller with a high speed steel on the outer layer. The chemical components of the high speed steel comprise, by weight, 2.1-2.3% of C, 0.2-0.4% of Si, 1.3-1.5% of Mn, 8.2-8.4% of Cr, 1.3-1.5% of Mo, 5.8-6.2% of W, 2.5-3.5% of V, 3.5-4.5% of Co, 2.1-2.3% of Ni, 0.004-0.006% of B, less than 0.1% of P, less than 0.015% of S, and the balance of Fe and unavoidable impurities. The preparation method comprises: 1) smelting an outer layer high speed steel; 2) adopting a prefabricated ball mill to cast an iron roller core, vertically placing in a water cooling casting mold, and pouring the molten steel liquid in the step 1); and 3) carrying out mechanical rough machining on the casted roller, carrying out quenching and tempering, and sequentially carrying out a heat treatment and mechanical finish machining.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing a hot-rolled composite work roll whose outer layer is high-speed steel. Background technique [0002] In recent years, hot rolling technology has made great progress. The development of hot rolling rolls has roughly experienced the following processes in terms of materials and manufacturing processes: Roller materials have gradually developed from single cast iron, ductile cast iron, and cast steel to composite The rolls are made of high-nickel-chromium cast iron, high-chromium cast iron and the latest high-speed steel casting; the manufacturing process has also developed from the ordinary integral casting process to the composite casting process, and the composite casting process has developed from the static casting method to the centrifugal casting method. [0003] The hot continuous rolling technology, which represents the level of con...

Claims

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Application Information

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IPC IPC(8): C22C38/56B22D19/16B21B27/00
Inventor林永峰
OwnerWUXI XINSANZHOU STEEL