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Alloy half steel composite roll collar and preparation process thereof

A composite roll and alloy technology, which is applied in the field of alloy semi-steel composite roll ring and preparation, can solve the problems of easy cracking in the process of manufacturing and use, difficulty in achieving metallurgical bonding of inner and outer layers, and failure to discharge inclusions, etc., to achieve good casting Microstructure, high strength and long service life

Active Publication Date: 2006-11-15
JIANGSU GONGCHANG ROLL
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the different materials of the molten steel in the working layer and the inner layer, it is difficult to control the pouring. For example, the inclusions cannot be discharged during pouring, and they exist in the joint part to cause casting defects. prone to cracking during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: respectively smelting alloy semi-steel of the present invention and spherical graphite steel (formula of the prior art). According to the composition of high-carbon and high-alloy semi-steel, the proportioned scrap steel and scrap steel rolls are put into the intermediate frequency furnace for melting. After melting, the chemical composition of the original molten steel is analyzed, and then the corresponding alloy material or pure metal is added, and the composition obtained by melting is C1. 95%, Si0.54%, Mn0.92%, Ni1.53%, Cr2.97%, Mo0.52%, P0.028%, S0.02%, the balance is Fe and a small amount of residual element molten steel. By vertical centrifugal casting of the composite roll ring, the working layer was poured when the molten steel temperature was 1437°C, and the inner layer was poured when the interface temperature was 1270°C and the spherical graphite molten steel temperature was 1355°C to obtain a composite roll ring. After heat treatment, the har...

Embodiment 2

[0015] Embodiment 2: As in Embodiment 1, according to the composition of high-carbon and high-alloy semi-steel, put the proportioned scrap steel and scrap steel roll into the intermediate frequency furnace for melting, analyze the chemical composition of the original molten steel after melting, and then add the corresponding alloy material or Pure metal, the composition obtained by smelting is C1.98%, Si0.53%, Mn0.98%, Ni1.64%, Cr3.03%, Mo0.57%, P0.024%, S0.022%, and the balance is Fe and a small amount of residual elements. Centrifugally cast the composite roll ring, cast the working layer when the molten steel is 1435°C, cast the inner layer when the interface temperature is 1266°C, and cast the inner layer when the temperature of the spherical graphite molten steel is 1357°C to obtain a composite roll ring. After heat treatment, the hardness of the working layer of the roll obtained is 61HSD. After the rolling test, the rolling capacity of the roll ring is increased by more...

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Abstract

This invention relates to the improvement of cold or hot roll casting steel semisteel compound roll collar and its preparation method. Its characteristic is the ingredient of the semisteel working lining, such as C 1.80-2.20%, Si 0.50-0.80%, Mn 0.80-1.10%, Ni 1.2-1.7%, Cr 2.80-3.20%, Mo 0.4-0.6%, P<=0.03% and S<=0.03%, the other is Fe and some residual element. When it is centrifugally cast, it should be separately controlled the steel liquid temperature of working lining at 80-100DEG C and the steel liquid temperature of inner casting lining is 90-110DEG C higher than the measurement of the liquid linear temperature. As the surface temperature of working lining is 50-80DEG C lower than the measurement of the liquid linear temperature, we can cast the inner lining. The semisteel gets by this way contained high carbon and alloy, and its basic composition mainly are bainite, carbonide and pearlite, so it has better hardness, toughness and abradability. The yield of millimeter steel can improve more than twice, and the working lining can combine fine with inner metallurgy.

Description

technical field [0001] The invention relates to the improvement of hot or cold-rolled cast steel alloy semi-steel composite roller ring and its preparation method. Background technique [0002] Most of the existing hot or cold-rolled cast steel roll rings (also known as roll rings) are made of semi-steel such as those described in GB1503-89 or similar medium and low carbon alloy semi-steel. The composite roll ring composed of such semi-steel, The main disadvantage is that the wear resistance of the material is not high, resulting in a short service life of the roll ring and a low rolling output. Although the semi-steel composite roll disclosed in Chinese patent 97103848.1, the composition of the semi-steel working layer of the roll is slightly adjusted, and its chemical composition is: (Wt%): 1.2-2.0% C, 0.15-0.3% Si, 0.6-1.0% Mn, 0.4 -0.7% Ni, 1.2-1.8% Cr, 0.2-0.6% Mo, P ≤ 0.1%, S ≤ 0.03%, and the rest Fe, however, the matrix structure of the working layer is still mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44B22D13/02
Inventor 张文君邵顺才步小平
Owner JIANGSU GONGCHANG ROLL
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