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Composite roll for centrifugally casting high-chromium cast iron and a preparation method thereof

A technology of high-chromium cast iron and composite rolls, which is applied in the direction of rolls, metal rolling, metal rolling, etc., can solve the problems of increased production costs and high prices of rolls, and achieve low production costs, less inclusions, and low production costs Effect

Inactive Publication Date: 2009-09-23
江苏环立板带轧辊有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the production of the above-mentioned high-chromium cast iron rolls, expensive nickel and molybdenum alloy elements need to be added, resulting in an increase in the production cost of the rolls

Method used

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  • Composite roll for centrifugally casting high-chromium cast iron and a preparation method thereof
  • Composite roll for centrifugally casting high-chromium cast iron and a preparation method thereof
  • Composite roll for centrifugally casting high-chromium cast iron and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The outer diameter of the high chromium cast iron composite roll of this embodiment is φ 370mm, the thickness of the roll outer layer is 60mm, and the unilateral processing amount of the roll outer layer is 8mm, and the outer layer (i.e. the roll body) and the roll core of the high chromium cast iron composite roll are respectively 1000kg and 1500kg Intermediate frequency induction furnace melting, its manufacturing process steps are:

[0045] The first step: smelting of the outer layer of high chromium cast iron:

[0046] ①Mix the alloy iron filings of the high-nickel-chromium infinite chilled cast iron roll, the silicon-calcium-barium alloy, and the low-carbon steel scrap, and compact it on a press to a size of (150-250) mm×(150-250) mm×(150~250)mm is a block whose length, width and height are 150-250mm respectively, and then put the compacted block into an induction furnace to heat and melt, and then add carbon ferrochrome and medium carbon ferromanganese in turn,

...

Embodiment 2

[0064] The body size of the high chromium cast iron composite roll in this embodiment is 650×1400mm, the outer layer (that is, the roll body) and the roll core of the composite roll are smelted in a 3t intermediate frequency induction furnace and a 5t / h cupola respectively. The manufacturing process steps are:

[0065] The first step: smelting of the outer layer of high chromium cast iron:

[0066] ①Mix the alloy iron filings of the high-nickel-chromium infinite chilled cast iron roll, the silicon-calcium-barium alloy, and the low-carbon steel scrap, and compact it on a press to a size of (150-250) mm×(150-250) mm×(150~250)mm squares, then put the compacted squares into the induction furnace to heat and melt, then add carbon ferrochrome and medium carbon ferromanganese in turn,

[0067] ②After the molten iron is melted, when the temperature of the molten iron reaches 1501°C, add aluminum, then add ferro-titanium and ferro-boron in sequence, and when the temperature of the mo...

Embodiment 3

[0084] The outer diameter of the high chromium cast iron composite roll of this embodiment is φ 370mm, the thickness of the roll outer layer is 60mm, and the unilateral processing amount of the roll outer layer is 8mm, and the outer layer (i.e. the roll body) and the roll core of the high chromium cast iron composite roll are respectively 1000kg and 1500kg Intermediate frequency induction furnace melting, its manufacturing process steps are:

[0085] The first step: smelting of the outer layer of high chromium cast iron:

[0086] ①Mix the alloy iron filings of the high-nickel-chromium infinite chilled cast iron roll, the silicon-calcium-barium alloy, and the low-carbon steel scrap, and compact it on a press to a size of (150-250) mm×(150-250) mm×(150~250)mm squares, then put the compacted squares into the induction furnace to heat and melt, then add carbon ferrochrome and medium carbon ferromanganese in turn,

[0087] ② After the molten iron is melted, when the temperature of...

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Abstract

The invention relates to a composite roll for centrifugally casting high-chromium cast iron and a preparation method thereof, belonging to the technical field of the steel rolling. The composite roll comprises a roll external layer and a roll core. The chemical components of the materials of the roll external layer in terms of the percentage by weight are as below: 25-28 of alloy scrap iron of a high-nickel-chromium infinite chilled iron roll, 28-30 of carbon ferrochrome, 1.5-2.5 of mid-carbon ferromanganese, 2.5-3.5 of ferroboron, 0.5-0.8 of silicon-calcium-barium alloy, 0.2-0.4 of aluminum, 0.3-0.5 of ferrotitanium, 0.2-0.4 of rare earth ferrosilicon, 0.10-0.15 of zinc, 0.15-0.18 of magnesium and the balance of low-carbon waste steel sheet. The roll core is high-strength alloy cast iron or low-alloy ductile cast iron. The roll external layer and the roll core are formed through centrifugal composite casting. The roll has low production cost, contains a small number of impurities and has high degree of purity; the hardenability, the mechanical performance and the thermal fatigue of the roll can be improved; and the roll has long service life and low production cost.

Description

technical field [0001] The invention relates to a centrifugal casting roll and a preparation method thereof, in particular to a centrifugal casting high-chromium cast iron 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. Centrifugal casting has been widely used in the production of rolls, especially in the production of high-alloy composite rolls, because of its high production efficiency, compact surface structure of castings and less machining allowance. At present, the commonly used hot roll materials include high-nickel...

Claims

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Application Information

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IPC IPC(8): B21B27/00B21B27/02C22C37/00C22C37/04C22C38/56C22C27/06C22C22/00C22C38/02C22C38/00C22C30/00B22D13/00B22D19/16C21D9/38C21D5/00
CPCY02P10/20
Inventor 浦建明符寒光
Owner 江苏环立板带轧辊有限公司
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