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A high-boron cast alloy roll and its manufacturing method

A technology for casting alloys and rolls, which is applied in the direction of metal rolling, metal rolling, rolls, etc., can solve the problems of difficult popularization and application, expensive alloy elements, and high production costs of rolls, and achieve good thermal stability and low as-cast hardness , The effect of reducing the production cost of rolled products

Inactive Publication Date: 2009-10-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned boron-containing rolls all contain more expensive alloy elements, the production cost of the rolls is high, and it is difficult to popularize and apply

Method used

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  • A high-boron cast alloy roll and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Use 500 kg of alkaline medium frequency induction furnace to melt high boron cast alloy rolls, the specific process steps are as follows:

[0039] ①Heating and melting ordinary steel scrap, ferrochrome, pig iron and ferrotungsten, adding ferrosilicon and ferromanganese after molten steel is melted;

[0040] ② After the composition of the furnace is adjusted to pass, the temperature is raised to 1549°C, adding aluminum deoxidation accounting for 0.10% of the above-mentioned molten steel mass, and then adding ferro-titanium and ferro-boron in sequence, and when the temperature of the molten steel reaches 1577°C, it is released from the furnace;

[0041] ③Crush the cerium-based rare earth and nitrogen-containing ferrochrome into small pieces with a particle size of 8-15mm, dry them at 160°C, place them at the bottom of the ladle, and perform compound modification treatment on the molten steel by pouring into the ladle;

[0042] ④Use a centrifugal casting machine to cast th...

Embodiment 2

[0050] Use 1000 kg alkaline intermediate frequency induction furnace to smelt high boron casting alloy rolls, the specific process steps are as follows:

[0051] ①Heating and melting ordinary steel scrap, ferrochrome, pig iron and ferrotungsten, adding ferrosilicon and ferromanganese after molten steel is melted;

[0052] ② After adjusting the composition before the furnace, the temperature is raised to 1520°C, adding aluminum deoxidation accounting for 0.08% of the above-mentioned molten steel mass, and then adding ferro-titanium and ferro-boron in sequence, and when the temperature of the molten steel reaches 1566°C, it is released from the furnace;

[0053] ③Crush the cerium-based rare earth and nitrogen-containing ferrochromium into small pieces with a particle size of 8-15mm, dry them at 200°C, place them at the bottom of the ladle, and perform compound modification treatment on the molten steel by pouring into the ladle;

[0054] ④Use a centrifugal casting machine to cas...

Embodiment 3

[0062] Use 1000 kg alkaline intermediate frequency induction furnace to smelt high boron casting alloy rolls, the specific process steps are as follows:

[0063] ①Heating and melting ordinary steel scrap, ferrochrome, pig iron and ferrotungsten, adding ferrosilicon and ferromanganese after molten steel is melted;

[0064] ② After adjusting the composition before the furnace, the temperature is raised to 1538°C, adding 0.12% of the above-mentioned molten steel mass for aluminum deoxidation, and then adding ferro-titanium and ferro-boron in sequence, and when the temperature of the molten steel reaches 1573°C, it is released from the furnace;

[0065] ③Crush the cerium-based rare earth and nitrogen-containing ferrochromium into small pieces with a particle size of 8-15mm, dry them at 180°C, place them at the bottom of the ladle, and perform compound modification treatment on the molten steel by pouring into the ladle;

[0066] ④Use a centrifugal casting machine to cast the outer...

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Abstract

A high-boron cast alloy roll and its manufacturing method pertain to the technical field of steel rolling. The purpose of the present invention is to provide a high-boron cast alloy roll with good wear resistance and low cost. The composition of the outer layer of the roll in the present invention (mass fraction, %): C 0.8-1.5, B 1.0-2.8, Cr 8.0-10.0, W 1.5-3.0, Ti 0.6-1.2, N 0.08-0.15, Ce 0.08-0.18, Si 0.3-0.8, Mn 0.4-0.8, S<0.04, P<0.05, and Fe as the rest, 2.2<=B+C<=3.7; the roll core adopts ductile cast iron; the outer layer and roll core are formed by centrifugal composite casting method. Through smelting in an electric furnace, centrifugal casting, rough machining, hardening and heat treatment, tempering and finish machining, the present invention prepare a high-boron cast alloy roll with high hardness and strength, desirable tenacity, resistance to wear and thermal fatigue, and low cost.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a casting roll and a manufacturing method thereof, in particular to a high-boron casting alloy rolling roll and a manufacturing method thereof. Background technique [0002] The development and selection of roll materials mainly focus on improving the wear resistance of the roll body and forming harder carbides in the metallographic structure of the roll body surface. The chilled cast iron rolls used in the early days are denoted by M 3 C-type carbides, such as Fe 3 C et al. The high-chromium cast iron roll developed by adding alloying element chromium later changed the form of carbides. 7 C 3 Type-based, such as Cr 7 C 3 Wait. The high-speed steel composite roll that is being rapidly promoted at present, in the state of use, the metallographic structure of the surface layer of the roll is mainly composed of MC, M 6 C-type carbide and matrix structure wi...

Claims

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Application Information

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IPC IPC(8): B21B27/00B21B27/02C22C38/32B22D19/16B22D13/00C21D9/38
Inventor 符寒光邢建东雷永平
Owner BEIJING UNIV OF TECH