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Modified high-speed steel roller and preparation method thereof

A high-speed steel and improved technology, applied in the direction of roll, metal rolling, metal rolling, etc., can solve the problems of increased production cost of roll, weak market competitiveness of roll, difficult promotion and application, etc., to save energy and shorten production cycle. , Overcome the effect of easy deformation

Inactive Publication Date: 2010-08-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned high-speed steel rolls all need to add expensive alloy elements such as vanadium, tungsten, and molybdenum, which leads to a significant increase in the production cost of the rolls, weak market competitiveness of the rolls, and difficulty in popularization and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The high-speed steel roll of the present invention is smelted in a 1000kg medium-frequency induction furnace, and poured Φ350mm * 2720mm high-speed steel composite roll, and its manufacturing process steps are:

[0036] ①Heat and melt 60% of M2 high-speed steel (W6Mo5Cr4V2) scrap, 23% of Q235 scrap and 9.4% of carbon ferrochrome with the furnace. After the molten steel is melted and heated to 1597°C, 1.0% of metal aluminum, 5.3 % of ferroboron, after 5 minutes of heat preservation, it is out of the oven. Among them, the chemical composition of M2 high-speed steel (W6Mo5Cr4V2) is: 0.80-0.90% C, 0.15-0.40% Mn, 0.20-0.45% Si, 3.80-4.40% Cr, 5.50-6.75% W, 4.50-5.50% Mo, 1.75- 2.20% V, the balance is Fe. The chemical composition of Q235 steel scrap is: 0.14-0.22% C, 0.30%-0.80% Mn, ≤0.30% Si, ≤0.045% S, ≤0.045% P, and the balance Fe. The chemical composition of carbon ferrochrome is: 59%-62% Cr, 7.5-8.2% C, <3.0% Si, <0.05% P, 0.06% S, and the balance Fe. The chemical com...

Embodiment 2

[0042] The high-speed steel roll of the present invention is smelted in a 1000kg medium-frequency induction furnace, and poured Φ370mm * 2910mm high-speed steel composite roll, and its manufacturing process steps are:

[0043] ① Heat and melt 65% of M2 high-speed steel (W6Mo5Cr4V2) steel scrap, 18% of Q235 steel scrap and 9.2% of carbon ferrochrome with the furnace. % of ferroboron, after 10 minutes of heat preservation, it is released from the oven. Among them, the chemical composition of M2 high-speed steel (W6Mo5Cr4V2) is: 0.80-0.90% C, 0.15-0.40% Mn, 0.20-0.45% Si, 3.80-4.40% Cr, 5.50-6.75% W, 4.50-5.50% Mo, 1.75- 2.20% V, the balance is Fe. The chemical composition of Q235 steel scrap is: 0.14-0.22% C, 0.30%-0.80% Mn, ≤0.30% Si, ≤0.045% S, ≤0.045% P, and the balance Fe. The chemical composition of carbon ferrochrome is: 59%-62% Cr, 7.5-8.2% C, <3.0% Si, <0.05% P, 0.06% S, and the balance Fe. The chemical composition of ferroboron is: 19.0-23.0% B, <0.5% C, <3.0% Si, <3...

Embodiment 3

[0049] The high-speed steel roll of the present invention is smelted in a 750kg medium-frequency induction furnace, and poured Φ320mm * 2580mm high-speed steel composite roll, and its manufacturing process steps are:

[0050] ①Heat and melt 62.8% of M2 high-speed steel (W6Mo5Cr4V2) scrap steel, 19.7% of Q235 steel scrap and 9.3% of carbon ferrochrome with the furnace. % ferroboron, after 8 minutes of heat preservation, it is released from the oven. Among them, the chemical composition of M2 high-speed steel (W6Mo5Cr4V2) is: 0.80-0.90% C, 0.15-0.40% Mn, 0.20-0.45% Si, 3.80-4.40% Cr, 5.50-6.75% W, 4.50-5.50% Mo, 1.75- 2.20% V, balance Fe. The chemical composition of Q235 steel scrap is: 0.14-0.22% C, 0.30%-0.80% Mn, ≤0.30% Si, ≤0.045% S, ≤0.045% P, and the balance Fe. The chemical composition of carbon ferrochrome is: 59%-62% Cr, 7.5-8.2% C, <3.0% Si, <0.05% P, 0.06% S, and the balance Fe. The chemical composition of ferroboron is: 19.0-23.0% B, <0.5% C, <3.0% Si, <3.0% Al, <...

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Abstract

The invention discloses a modified high-speed steel roller and a preparation method thereof. The modified high-speed steel roller is formed by adopting a centrifugal composite casting method and has a roller outer layer of high-speed steel and a roller inner layer of ductile iron or high-strength cast iron. The preparation method comprises the following steps of: forming the roller outer layer on a centrifugal casting machine; then, filling a static roller core with melted iron; and casting into a high-speed steel composite roller. The roller outer layer of the high-speed steel roller is prepared from raw materials in percentage by weight: 60-65 percent of M2 high-speed waste steel (W6Mo5Cr4V2), 1.0-1.4 percent of metal aluminum, 5.0-5.5 percent of boron iron, 9.2-9.4 percent of carbon ferrochrome iron, 0.2-0.4 percent of titanium iron, 1.0-1.2 percent of nickel-magnesium alloy and 18-23 percent of waste steel Q235. The roller can be produced by utilizing an electric furnace, has high hardness, simple and convenient process, low production cost and favorable wear resistance without adding noble iron alloy or quenching treatment and can have favorable economic benefits by popularization and use.

Description

technical field [0001] The invention relates to a method for manufacturing a hot roll, in particular to an improved high-speed steel roll and a preparation method thereof, and belongs to the technical field of casting. Background technique [0002] Hot rolling rolls often work in a high-temperature environment of 700°C to 800°C. They are in contact with hot steel billets and need to withstand strong rolling force. Subject to thermal fatigue with large temperature changes. This requires that the hot roll material must have high hardenability, low thermal expansion coefficient, high thermal conductivity, high high temperature yield strength and high oxidation resistance. In the past, forged steel and infinite chilled cast iron rolls were mainly used for hot rolling rolls. In addition to ordinary chilled cast iron, there are also low-nickel-chromium-molybdenum, medium-nickel-chromium-molybdenum, and high-nickel-chromium-molybdenum cast iron materials. The high-grade chilled ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D13/02B21B27/02C21C5/52B22D1/00C21D9/38
CPCY02P10/20
Inventor 符寒光刘元朋雷永平宫开令杜忠泽蒋志强
Owner BEIJING UNIV OF TECH
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