Resource-saving boron-containing high-speed steel composite roll and preparation method thereof

A composite roll, resource-saving technology, applied in the direction of roll, metal rolling, metal rolling, etc., can solve the problems of reduced probability of broken rolls, complicated manufacturing process, reduced peeling rate, etc., to achieve reduced burning loss, less inclusions, Effect of improving hardenability and hardenability

Inactive Publication Date: 2011-06-29
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the original double-layer or three-layer composite high-speed steel roll, the invention’s composite high-speed steel roll has a reduction of about 30% in the peeling rate of the working layer and a 50-60% reduction in the probability of roll breakage during the rolling process, but there are disadvantages such as complex manufacturing process
Moreover, the above-mentioned high-speed steel composite rolls all need to add more iron alloys such as tungsten, molybdenum, vanadium, niobium, etc., resulting in a huge waste of resources

Method used

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  • Resource-saving boron-containing high-speed steel composite roll and preparation method thereof
  • Resource-saving boron-containing high-speed steel composite roll and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0041] The boron-containing high-speed steel composite roll of the present embodiment is Tropical continuous rolling work rolls. The outer layer (that is, the roller body) and the roller core are smelted in a 750kg and 3000kg medium frequency induction furnace respectively, and the manufacturing process steps are:

[0042] The first step: Melting of the outer boron-containing high-speed steel material

[0043] ① First mix the high-speed steel rolls, high-chromium cast iron rolls and high-nickel-chromium infinite chilled cast iron rolls with alloy iron filings, tungsten slag iron alloys, and low-carbon scrap steel sheets, and compact them on a press to form a size (150-250 )mm×(150~250)mm×(150~250)mm squares, and then put the compacted squares into the induction furnace for heating and melting.

[0044] ② After the molten steel is melted, when the temperature of the molten steel reaches 1552°C, first add low-carbon ferromanganese for pre-deoxidation, then use magnesium-alumi...

Embodiment 2

[0057] The boron-containing high-speed steel composite roll of the present embodiment is Tropical continuous rolling work rolls. The outer layer (that is, the roll body) and the roll core are melted in a 1500kg medium frequency induction furnace and a 10 ton hot air cupola respectively. The manufacturing process steps are:

[0058] The first step: Melting of the outer boron-containing high-speed steel material

[0059] ① First mix the high-speed steel rolls, high-chromium cast iron rolls and high-nickel-chromium infinite chilled cast iron rolls with alloy iron filings, tungsten slag iron alloys, and low-carbon scrap steel sheets, and compact them on a press to form a size (150-250 )mm×(150~250)mm×(150~250)mm squares, and then put the compacted squares into the induction furnace for heating and melting.

[0060] ② After the molten steel is melted, when the temperature of the molten steel reaches 1579°C, first add low-carbon ferromanganese for pre-deoxidation, then use magnes...

Embodiment 3

[0073] The boron-containing high-speed steel composite roll of the present embodiment is Bar mill work rolls. The outer layer (that is, the roller body) and the roller core are melted in a 500kg intermediate frequency induction furnace and a 1000kg intermediate frequency induction furnace respectively. The manufacturing process steps are:

[0074] The first step: Melting of boron-containing high-speed steel material in the outer layer

[0075]① First mix the high-speed steel rolls, high-chromium cast iron rolls and high-nickel-chromium infinite chilled cast iron rolls with alloy iron filings, tungsten slag iron alloys, and low-carbon scrap steel sheets, and compact them on a press to form a size (150-250 )mm×(150~250)mm×(150~250)mm squares, and then put the compacted squares into the induction furnace for heating and melting.

[0076] ②After the molten steel is melted, when the temperature of the molten steel reaches 1568°C, first add low-carbon ferromanganese for pre-deoxi...

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Abstract

The invention discloses a resource-saving boron-containing high-speed steel composite roll and a manufacturing method thereof, wherein the composite roll provided by the invention is prepared through centrifuging compound casting of an outer layer part and a roll core part. The outer layer comprises the following raw materials in percentage by weight: 35% of alloy scrap iron of high-speed steel roll, 20-25% of alloy scrap iron of high-chromium iron roll, 15-20% of alloy scrap iron of high nickel-chromium infinite chilled cast iron roll, 4-8% of tungsten dreg-iron alloy, 1.0-1.5% of ferroboron, 1.0-1.2% of low-carbon ferromanganese, 0.15-0.25% of ferrotitanium, 0.2-0.3% of yttrium-base heavy-tombarthite antaciron, 0.25-0.30% of nitrogenized ferrochrome, 0.2-0.3% of magnesium-aluminum-calcium alloy, and the balance of low-carbon waste steel sheet. The roll core is spheroidal graphite cast iron. The composite roll has the advantages of good comprehensive mechanical property and abrasive resistance, is manufactured by utilized roll processing dregs as main raw material, has the characteristics of resource conservation, low cost and the like, and has good economic and social benefits in popularization and application.

Description

technical field [0001] The invention relates to a composite roll and a preparation method thereof, in particular to a resource-saving boron-containing high-speed steel composite roll and a preparation method thereof, belonging to the technical field of steel rolling. Background technique [0002] Rolls are the main consumable spare parts in steel rolling production. The quality of rolls directly affects the surface quality of rolled materials, the operating rate of rolling mills and the production cost of rolled materials. Improving the quality of rolls and reducing the production cost of rolls have always been the subject of continuous concern for roll manufacturers. [0003] At present, the commonly used hot roll materials include high-nickel-chromium infinitely chilled cast iron, semi-steel, high-chromium white cast iron and high-carbon high-speed steel. The former high-nickel-chromium infinitely chilled cast iron rolls are brittle due to the continuous network distributio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B27/02B22D19/16
Inventor 符寒光郭红星蒋业华周荣雷永平岑启宏窦永平
Owner BEIJING UNIV OF TECH
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