Production process of niobium-molybdenum chilled alloy composite roller

A production process and composite roll technology, applied in the field of composite rolls, can solve the problems of composite roll wear resistance, poor hardness, unsatisfactory use effect, large hardness drop, etc., to improve hardenability, increase hardness, and reduce hardness drop Effect

Pending Publication Date: 2022-08-05
HUBEI TENGSHENG TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, nickel-chromium-molybdenum ductile iron rolls and nickel-chromium-molybdenum infinite chilled rolls are commonly used for rolling angle steel and small steel products in the industry. These two types of rolls can basically meet the requirements when used as rolling line bar and strip rolling. Angle steel and small steel are not easy to use. Generally, the grooves of wire, bar and strip steel are not deep, which has little effect on the hardness drop of the working layer. However, the rolling angle steel and small steel have a deep hole type and a large hardness drop. , the hardness of the outer mouth of the pass and the bottom of the groove are different, the bottom of the groove is soft, easy to wear, the use effect is not ideal, and the wear resistance and hardness of the composite roll product are poor. Based on this, the present invention further improves it.

Method used

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  • Production process of niobium-molybdenum chilled alloy composite roller
  • Production process of niobium-molybdenum chilled alloy composite roller
  • Production process of niobium-molybdenum chilled alloy composite roller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The production process of the niobium-molybdenum chilled carbide composite roll of the present embodiment comprises the following steps:

[0072] Step 1, prepare working layer raw materials:

[0073] Weigh the following raw materials by weight: C 3.0%, Si 0.8%, Mn 0.5%, Cr 1.0-1.2%, Nb 0.5%, modified Mo 0.6%, Ni 3.0%, modified carbon nanotubes 0.2%, The remainder is Fe;

[0074] Step 2, prepare the raw materials for the core layer:

[0075] C 4.1%, Si 0.5%, Mn 0.15%, P 0.03%, S 0.02%, the balance is Fe;

[0076] Step 3, using a 1.5-ton intermediate frequency furnace to smelt the raw material for the working layer to prepare molten iron for the working layer, and a 3-ton intermediate frequency furnace to smelt the raw material for the core layer to prepare the core roll neck molten iron;

[0077] Step 4: Centrifugally pour molten iron in the working layer at 1350°C, and after the pouring is completed, a working layer is formed;

[0078] In step 5, the heat treatment ...

Embodiment 2

[0098] The production process of the niobium-molybdenum chilled carbide composite roll of the present embodiment comprises the following steps:

[0099] Step 1, prepare working layer raw materials:

[0100] Weigh the following raw materials by weight: C 3.2%, Si 1.0%, Mn 0.6%, Cr 1.2%, Nb 0.6%, modified Mo 0.7%, Ni 3.2%, modified carbon nanotubes 0.7%, the balance is Fe;

[0101] Step 2, prepare the raw materials for the core layer:

[0102] C 4.3%, Si 1.4%, Mn 0.25%, P 0.1%, S 0.04%, the balance is Fe;

[0103] Step 3, using a 1.5-ton intermediate frequency furnace to smelt the raw material for the working layer to prepare molten iron for the working layer, and a 3-ton intermediate frequency furnace to smelt the raw material for the core layer to prepare the core roll neck molten iron;

[0104] Step 4: Centrifugally pour molten iron in the working layer at 1370°C, and after the pouring is completed, a working layer is formed;

[0105] In step 5, the heat treatment process...

Embodiment 3

[0125] The production process of the niobium-molybdenum chilled carbide composite roll of the present embodiment comprises the following steps:

[0126] Step 1, prepare working layer raw materials:

[0127] Weigh the following raw materials by weight: C 3.1%, Si 0.9%, Mn 0.55%, Cr 1.1%, Nb 0.55%, modified Mo 0.65%, Ni 3.1%, modified carbon nanotubes 0.45%, the remainder is Fe;

[0128] Step 2, prepare the raw materials for the core layer:

[0129] C 4.2%, Si 0.9%, Mn 2.0%, P 0.06%, S 0.03%, the balance is Fe;

[0130] Step 3, using a 1.5-ton intermediate frequency furnace to smelt the raw material for the working layer to prepare molten iron for the working layer, and a 3-ton intermediate frequency furnace to smelt the raw material for the core layer to prepare the core roll neck molten iron;

[0131] Step 4: Centrifugally pour the molten iron in the working layer at 1360°C. After the casting is completed, the working layer is formed;

[0132] In step 5, the heat treatment...

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Abstract

The invention discloses a production process of a niobium-molybdenum chilled alloy composite roller, which comprises the following steps: smelting a working layer raw material by using a 1.5-ton intermediate frequency furnace to prepare working layer iron liquid, and smelting a core layer raw material by using a 3-ton intermediate frequency furnace to prepare core roller neck iron liquid; fourthly, centrifugal casting is conducted at the temperature of 1350-1370 DEG C, and a working layer is formed after casting is finished; then, core roller neck iron liquid with the temperature of 1375-1385 DEG C is cast in a static core filling mode to form a core layer. Through scientific research and innovation, by adjusting a matrix structure, then adding niobium and molybdenum and through iron mold centrifugal chilling casting, the hardness fall is reduced, and the hardness of a working layer of the roller is improved; the carbon content fully ensures that metal and carbon can form stable network carbide, and the hardness and toughness of the roller are improved.

Description

technical field [0001] The invention relates to the technical field of composite rolls, in particular to a production process of a niobium-molybdenum chilled-hard alloy composite roll. Background technique [0002] With the development of modern industrial technology, the importance of the iron and steel industry as the country's pillar industry has become more prominent, and various types of industrial steel have become more refined. The production and rolling requirements of special steel are more standardized and strict. In the past, the rolling technology of steel was relatively backward, the requirements for the rolling process were not high, and the available roll materials were relatively simple. Around 2000, with the centrifugal casting process For rolls, the casting process has reached a new level, creating a variety of possibilities for the production of roll working layers for various alloy combinations. There are materials on the market: niobium molybdenum chill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D13/02B22D19/16C22C38/02C22C38/04C22C38/44C22C38/48
CPCB22D13/02B22D19/16C22C38/02C22C38/04C22C38/48C22C38/44
Inventor 陈明华张鼎毅
Owner HUBEI TENGSHENG TECH LLC
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