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A high-boron cast alloy guide and its heat treatment method

A heat treatment method and casting alloy technology, which is applied in the field of steel rolling, can solve the problems of complex production process, poor toughness of guide rollers, high production cost, etc., and achieve the effect of high strength and hardness, good toughness and wear resistance, and low carbon content

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

There are deficiencies such as complex production process, high production cost and poor toughness of guide rollers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A 250 kg medium frequency induction furnace is used to melt high boron casting alloy guides. The melting, casting and heat treatment processes are as follows:

[0039] 1) Mix and heat scrap steel, ferrochrome and ferromolybdenum, add ferromanganese after the molten steel is melted, add aluminum when the temperature rises to 1497°C, and then add ferroboron, ferrotitanium and ferroniobium in sequence, and adjust the composition before the furnace to pass, Raise the temperature of the molten steel to 1548°C, remove the slag and leave the furnace;

[0040] 2) The V-N alloy containing 70-85wt% of V and 15-30wt% of N is broken into small pieces with a particle size of 3-8mm, wrapped tightly with steel sheets with a thickness of 0.5mm, and when 60% of the steel is tapped, the The wrapped vanadium nitrogen alloy rushes into the ladle along with the molten steel;

[0041] 3) Break the rare earth magnesium alloy into small pieces with a particle size of less than 12mm, dry it be...

Embodiment 2

[0050] A 500 kg medium frequency induction furnace is used to melt high boron cast alloy guides. The melting, casting and heat treatment processes are as follows:

[0051] 1) Mix and heat scrap steel, ferrochrome and ferromolybdenum, add ferromanganese after the molten steel is melted, add aluminum when the temperature rises to 1483°C, and then add ferroboron, ferrotitanium and ferroniobium in sequence, and adjust the composition before the furnace to pass, Raise the temperature of the molten steel to 1521°C, remove the slag and leave the furnace;

[0052] 2) The V-N alloy containing 70-85wt% of V and 15-30wt% of N is broken into small pieces with a particle size of 3-8mm, wrapped tightly with steel sheets with a thickness of 0.2mm, and when 42% of the steel is tapped, the The wrapped vanadium nitrogen alloy rushes into the ladle along with the molten steel;

[0053] 3) Break the rare earth magnesium alloy into small pieces with a particle size of less than 12mm, dry it below...

Embodiment 3

[0062] A 350 kg intermediate frequency induction furnace is used to melt high boron cast alloy guide materials, and the melting, casting and heat treatment processes are as follows:

[0063] 1) Mix and heat scrap steel, ferrochrome and ferromolybdenum, add ferromanganese after the molten steel is melted, add aluminum when the temperature rises to 1493°C, and then add ferroboron, ferrotitanium and ferroniobium in sequence, after adjusting the composition before the furnace to pass, Raise the temperature of the molten steel to 1528°C, remove the slag and leave the furnace;

[0064] 2) The V-N alloy containing 70-85wt% of V and 15-30wt% of N is broken into small pieces with a particle size of 3-8mm, wrapped tightly with steel sheets with a thickness of 0.2mm, and when 55% of the steel is tapped, the The wrapped vanadium nitrogen alloy rushes into the ladle along with the molten steel;

[0065] 3) Break the rare earth magnesium alloy into small pieces with a particle size of less...

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Abstract

A high-boron cast alloy guide and its heat treatment method pertain to the technical field of steel rolling. The chemical composition of the guide provided by the present invention (mass fraction, %): C 0.25-0.45, Cr 12.0-15.0, B 1.0-2.5, Mo 0.5-0.8, Mn 1.8-2.5, Al 0.10-0.30, Re 0.08-0.20, Mg 0.04-0.08, V 0.05-0.10, N 0.01-0.03, Ti 0.10-0.20, Nb 0.10-0.20, 0.25<=Ti+Nb<=0.35, Si<1.0, S<0.05, P<0.05, and Fe as the rest. Through smelting, casting, oil quenching, tempering and other steps, the present invention prepares a high-boron cast alloy guide with high hardness and strength, desirable tenacity and wear resistance, and low cost.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a rolling mill guide and a manufacturing method thereof, in particular to a high-boron casting alloy guide and a heat treatment method thereof. Background technique [0002] During the rolling process, the working environment of the guides (including the guide plates and guide rollers) at the steel import and export of the rolling mill is very harsh, and the red hot steel above 900°C passes through the guides continuously, and at the same time, it needs to be cooled by spraying water. , the temperature difference changes greatly and sharply. Therefore, the guide wears quickly, has a low service life, needs to be replaced frequently, consumes a lot, and is prone to cracks and breaks, which affects the production efficiency of steel rolling. In addition, the steel sticking phenomenon is easy to occur during the use of the guide and guard, which affects the qualit...

Claims

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Application Information

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IPC IPC(8): B21B39/16C22C38/38C22C33/06B22D1/00C21D1/18C21D1/58C21D1/32
Inventor 符寒光邢建东雷永平吴中伟林键成小乐蒋志强
Owner BEIJING UNIV OF TECH
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