Reinforced alloy cast steel roller and preparation method thereof

An alloy cast steel, reinforced technology, applied in the direction of metal rolling, metal rolling, rolls, etc., can solve the problems of roll pass side wall wear, large rolling force, high rolling speed, etc., to improve the matrix structure, improve Crack tendency, effect of improving high temperature strength and yield ratio

Active Publication Date: 2020-12-01
江苏凯达重工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hot-rolled section steel finish roll has a large rolling force and a high rolling speed. Working in a high-temperature and high-load environment for a long time, the side wall of the roll pass is severely worn. cause block defect

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0023] A method for preparing a reinforced alloy cast steel roll according to an embodiment of the present invention includes the following steps:

[0024] S1. Molding: use sand to mold the roll mold box, the roll mold box includes: upper roll neck mold box, roll body mold box and lower roll neck mold box, upper roll neck mold box, roll body mold box and lower roll neck mold box Coaxial connection from top to bottom;

[0025] S2. Smelting: Use an intermediate frequency furnace to smelt molten iron. Among them, ferroniobium and ferro-vanadium are added when smelting to 1650°C. After ferroniobium and ferro-vanadium are fully melted, the molten iron is released when the temperature drops to 1600°C, and 0.5% aluminum is added after the furnace is released. ingots for final deoxidation treatment;

[0026] S3. Casting: The smelted molten iron is calmed by argon blowing for 10 minutes, and poured into the roll mold box after the temperature drops to 1500-1550°C;

[0027] S4. Unpack...

Embodiment 1

[0032] Manufacture a Φ1600х1500mm alloy cast steel roll. The target chemical composition and weight percentage requirements are: C0.7%~0.9%, Si0.3%~0.8%, Mn0.5%~1.0%, Cr1.0%~1.5%, Ni0.5%~ 1.0%, Mo0.3%~0.8%, Nb0.1%~0.3%, V0.1%~0.3%, P≤0.03%, S≤0.025%, and the rest are Fe and unavoidable impurities.

[0033] According to the preparation method of the reinforced alloy cast steel roll of the embodiment of the present invention, a certain ratio of scrap steel and alloy melting steel is added into the intermediate frequency furnace, and when the temperature of the molten steel is melted and the temperature rises to 1650°C, 1~3mm Ferroniobium grains and iron vanadium grains, after the alloy is fully dissolved and the molten steel temperature is 1600°C, it is released from the furnace, then 0.5% aluminum ingots are added, and the final deoxidation treatment is performed, and the molten steel is calmed by blowing argon for 10 minutes, and the pouring is completed when the temperature o...

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Abstract

The invention discloses a reinforced alloy cast steel roller. The reinforced alloy cast steel roller is prepared from the alloy elements in percentage by weight: 0.7%-0.9% of C, 0.3%-0.8% of Si, 0.5%-1.0% of Mn, 1.0%-1.5% of Cr, 0.5%-1.0% of Ni, 0.3%-0.8% of Mo, 0.1%-0.3% of Nb, 0.1%-0.3% of V, less than or equal to 0.03% of P, less than or equal to 0.025% of S, and the balance of Fe and inevitable impurities. A matrix structure of a roller is improved by adding the elements Nb and V, roll usability performance is improved, and Nb can achieve the effects of grain refinement and solid solutionstrengthening. The trace Nb can improve the strength and impact toughness of steel under the condition of not influencing the plasticity and toughness of the steel, V can refine grains, improve high-temperature strength and yield ratio of the roller after normalizing and improve crack tendency, so that tensile strength of the roller surface of the roller is improved, the defects of groove chipping, stripping and the like of the roller are avoided, meanwhile, a steel passing amount is increased, and production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of rolls, and in particular relates to a reinforced alloy cast steel roll and a preparation method thereof. Background technique [0002] At present, the domestic section steel finish rolling production technology is insufficient. In order to improve the surface quality of steel, reduce roll consumption, and increase rolling output, high carbon steel-based rolls are usually used for the finish rolls of section steel mills. Its main chemical composition is C1.3~1.7%, Si0.4~1.0%, Mn0.7~1.5%, Cr0.8~1.5%, Ni1.0~1.5%, Mo0.3~0.8%, P≤0.03 %, S≤0.025%, the rest is Fe and unavoidable impurities. The hot-rolled section steel finish roll has a large rolling force and a high rolling speed. Working in a high-temperature and high-load environment for a long time, the side wall of the roll pass is severely worn. cause block defects. Contents of the invention [0003] The present invention aims to solve at least one of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48B22C9/02B22C9/28C21D1/18C21D1/26C21D1/28C21D6/00C21D9/38C22C33/06B21B27/00
CPCB21B27/00B22C9/02B22C9/28C21D1/18C21D1/26C21D1/28C21D6/004C21D6/005C21D6/008C21D9/38C22C33/06C22C38/002C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48
Inventor 许健周群许云鹏
Owner 江苏凯达重工股份有限公司
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