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Directional solidification high-boron high-vanadium high-speed steel and production method thereof

A technology of directional solidification and high-speed steel, which is applied in the manufacture of tools, casting equipment, metal processing equipment, etc., can solve the problems of high brittleness of eutectic boron carbide, high brittleness of high-boron high-speed steel, and easy peeling of hot rolls, etc., to achieve Uniform distribution, reducing internal stress, and improving filling performance

Active Publication Date: 2021-11-30
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-boron high-speed steel has high hardness, but the eutectic boron carbide itself is brittle, has a coarse structure, and is distributed in the matrix in a network shape, resulting in high-boron high-speed steel brittleness, and the manufactured hot rolls are prone to peeling and cracking during service and insufficient wear resistance

Method used

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  • Directional solidification high-boron high-vanadium high-speed steel and production method thereof
  • Directional solidification high-boron high-vanadium high-speed steel and production method thereof
  • Directional solidification high-boron high-vanadium high-speed steel and production method thereof

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preparation example Construction

[0042] A method for preparing directionally solidified high-boron and high-vanadium high-speed steel, which is prepared by a directional solidification process, better controls the grain orientation of the solidified structure, and forms a continuous columnar grain structure. The specific steps are as follows:

[0043] S1. Add pig iron, scrap steel, low-carbon ferrochrome, ferromanganese, ferroboron, ferrovanadium, industrial pure iron, ferromolybdenum, ferrotungsten, and ferrosilicon as raw materials into the melting furnace for melting, and then add 0.148~ 0.152g of aluminum wire is deoxidized by furnace bottom deoxidation method, and the molten steel after scalding is returned to the furnace, and refined by blowing argon at the bottom for 8 to 15 minutes to obtain qualified, clean and impurity-free high-boron, high-vanadium high-speed steel molten steel for step S2;

[0044] The raw materials are pig iron, scrap steel, low-carbon ferrochrome, ferromanganese, ferroboron, ferr...

Embodiment 1

[0057] Directional Solidification Specimen Preparation

[0058]The invention selects pig iron, scrap steel, low-carbon ferrochrome, ferromanganese, ferroboron, ferrovanadium, industrial pure iron, ferromolybdenum, ferrotungsten, ferrosilicon and ferro-titanium as raw materials. Add 25.176% scrap steel (the chemical composition and mass fraction of scrap steel are 0.300% C, 0.300% Si, 0.500% Mn, and the balance is Fe), 41.852% pure iron (the chemical composition mass fraction of pure iron is 0.003% C, 0.020% Si, 0.150% Mn, the balance is Fe), 1.038% ferromanganese (the chemical composition mass fraction of ferromanganese is 6.410% C, 1.630% Si, 65.900% Mn, the balance is Fe), 0.463% ferrosilicon ( The chemical composition mass fraction of ferrosilicon is 0.100% C, 73.100% Si, the balance is Fe), 4.893% pig iron (the chemical composition mass fraction of pig iron is 4.270% C, 0.900% Si, 0.113% Mn, the balance is Fe) , 8.520% low-carbon ferrochromium (the chemical composition ma...

Embodiment 2

[0063] Directional Solidification Specimen Preparation

[0064] The invention selects pig iron, scrap steel, low-carbon ferrochrome, ferromanganese, ferroboron, ferrovanadium, industrial pure iron, ferromolybdenum, ferrotungsten, ferrosilicon and ferro-titanium as raw materials. Add 25.177% scrap steel (the chemical composition and mass fraction of scrap steel are 0.300% C, 0.300% Si, 0.500% Mn, and the balance is Fe), 41.852% pure iron (the chemical composition mass fraction of pure iron is 0.003% C, 0.020% Si, 0.150% Mn, the balance is Fe), 1.038% ferromanganese (the chemical composition mass fraction of ferromanganese is 6.410% C, 1.630% Si, 65.900% Mn, the balance is Fe), 0.463% ferrosilicon ( The chemical composition mass fraction of ferrosilicon is 0.100% C, 73.100% Si, the balance is Fe), 4.893% pig iron (the chemical composition mass fraction of pig iron is 4.270% C, 0.900% Si, 0.113% Mn, the balance is Fe) , 8.520% low-carbon ferrochromium (the chemical composition m...

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Abstract

The invention discloses directional solidification high-boron high-vanadium high-speed steel and a production method thereof. The production method of the directional solidification high-boron high-vanadium high-speed steel comprises the following steps: with pig iron, waste steel, low-carbon ferrochrome, ferromanganese, ferroboron, ferrovanadium, industrial pure iron, ferromolybdenum, ferrotungsten, ferrosilicon and / or ferrotitanium as raw materials, conducting smelting treatment at the temperature of 1580-1600 DEG C, and then conducting refining treatment to obtain molten high-boron high-vanadium high-speed steel; and subjecting the molten high-boron high-vanadium high-speed steel to overheating heat preservation treatment, then controlling the pouring temperature to be 1420-1430 DEG C for directional solidification treatment, and waiting for the temperature to drop to the room temperature to obtain the directional solidification high-boron high-vanadium high-speed steel. The high-boron high-vanadium high-speed steel is produced by adopting a directional solidification technology, and the grain orientation of a solidification structure can be well controlled through the directional solidification technology, so that the high-boron high-speed steel presents certain orientation, a continuous columnar crystal structure is formed, thus various kinds of performance of the material is greatly improved, and compared with common high-boron high-speed steel, the high-boron high-speed steel has better performance.

Description

technical field [0001] The invention belongs to the technical field of directionally solidified metal wear-resistant materials, and in particular relates to a directionally solidified high-boron and high-vanadium high-speed steel and a preparation method thereof. Background technique [0002] High-speed steel is an early and widely used wear-resistant material. It is mainly composed of two basic components: one is the hard phase carbide, which makes the high-speed steel wear better; the other is the metal wrapped around the carbide. Matrix, which makes high-speed steel have better toughness and ability to absorb impact. Among the alloying elements of high-speed steel, vanadium has a significant impact on high-speed steel. Vanadium is beneficial to the formation of MC-type carbides, and it also significantly promotes lamellar M 2 Formation of C-type carbides against skeletal M 6 The formation of C-type carbides, thereby improving the wear resistance of high-speed steel. T...

Claims

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Application Information

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IPC IPC(8): C22C33/06B22D27/04C22C38/32C22C38/02C22C38/04C22C38/22C22C38/28C22C38/06C22C38/24B22D46/00C21C7/06C21C7/072
CPCC22C33/06B22D27/045C22C38/32C22C38/02C22C38/04C22C38/22C22C38/28C22C38/06C22C38/24B22D46/00C21C7/06C21C7/072B22D29/00
Inventor 马胜强郭鹏佳邢建东檀旭吕萍付沙沙
Owner XI AN JIAOTONG UNIV
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