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High-hardenability high-boron cast steel and preparation method thereof

A technology with high hardenability and high boron, applied in the field of anti-wear metal materials, can solve the problems of surface oxidation, low toughness and small quenching stress of the workpiece, and achieve the effects of short production cycle, simple process and low residual stress.

Active Publication Date: 2018-08-03
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned high-speed steels must be subjected to complex high-temperature heat treatment, high energy consumption, serious surface oxidation of the workpiece, and because borides are relatively brittle, the toughness is not too high, and the high quenching stress caused by the high cooling rate during the quenching process tends to make them more brittle. Therefore, it is very necessary to improve the hardenability of high boron alloys to obtain strong and tough cast high boron alloys and ensure small quenching stress, quenching deformation and not easy to appear quenching cracks.

Method used

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  • High-hardenability high-boron cast steel and preparation method thereof
  • High-hardenability high-boron cast steel and preparation method thereof

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preparation example Construction

[0031] A method for preparing high-hardenability high-boron cast steel disclosed by the invention comprises the following steps:

[0032] 1) Take scrap steel, ferrochrome, ferromanganese, carbon steel, ferroboron, pure copper rod and pure nickel rod as the furnace charge, mix scrap steel, ferrochrome, ferromanganese and carbon steel first, then fill them into the melting furnace, and heat until melted ;

[0033] 2) After pulverizing and drying the ferroboron, place it at the bottom of the ladle, and add the ferroboron into the smelting furnace by pouring into the ladle;

[0034] 3) Raise the temperature of the smelting furnace to 1500-1580°C, add deoxidizer aluminum wire for deoxidation, and then add pure copper rods and nickel rods after the furnace charge is completely melted;

[0035] 4) When the temperature of the molten steel reaches 1400-1480°C, pour it into castings, then anneal the castings, and air cool them to room temperature to produce high-hardenability high-boro...

Embodiment 1

[0041] Adopt 500 kilograms of medium-frequency induction furnaces to smelt the high-boron cast steel of the present invention, and its manufacturing process steps are:

[0042] 1) Mix steel scrap, ferrochrome, ferromanganese and carbon steel and heat to melt;

[0043] 2) Broken ferroboron into small pieces smaller than 15mm, dried at below 250°C, placed at the bottom of the ladle, and added ferroboron by pouring into the ladle;

[0044] 3) Raise the temperature of the smelting furnace to 1560°C, add deoxidizer aluminum wire, and add pure copper rods and pure nickel rods after the furnace charge is completely melted;

[0045] 4) When the temperature of the molten steel reaches 1450°C, it is directly poured into a casting, and finally the casting is annealed for stress relief at a low temperature of 200°C for 3 hours, and then air-cooled to room temperature.

[0046] The specific composition of the high-boron cast steel obtained in this embodiment is shown in Table 2. Its hardnes...

Embodiment 2

[0048] Adopt 500 kilograms of medium-frequency induction furnaces to smelt the high-boron cast steel of the present invention, and its manufacturing process steps are:

[0049] 1) Mix steel scrap, ferrochrome, ferromanganese and carbon steel and heat to melt;

[0050] 2) Broken ferroboron into small pieces smaller than 15mm, dried at below 250°C, placed at the bottom of the ladle, and added ferroboron by pouring into the ladle;

[0051] 3) Raise the temperature of the smelting furnace to 1560°C, add deoxidizer aluminum wire, and add pure nickel rods after the furnace charge is completely melted;

[0052] 4) When the temperature of the molten steel reaches 1450°C, it is directly poured into a casting, and finally the casting is annealed for stress relief at a low temperature of 200°C for 3 hours, and then air-cooled to room temperature.

[0053] The specific composition of the high-boron cast steel obtained in this embodiment is shown in Table 2. Its hardness reaches 65.2 ± 1H...

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Abstract

The invention discloses a high-hardenability high-boron cast steel and a preparation method thereof, and belongs to the technical field of abrasion-proof metal materials. The high-hardenability high-boron cast steel comprises the following chemical components in percentage by mass: 0.3-0.4% of C, 1.9-2.2% of B, 3.5-4.0% of Cr, 1.5-2.0% of Mn, 0.8-1.0% of Si, 0.6-1.2% of Ni, 0.5-1.5% of Cu, less than 0.04% of S, less than 0.04% of P, and the balance Fe. The high-hardenability high-boron cast steel can be produced through an electric furnace, and the technology is simple; in addition, precious alloy elements are not added, so that the cost is low; and the economic benefit is high. The high-boron cast steel has the advantages of being high in hardenability, high in hardness, high in toughness, high in abrasion resistance, and low in quenching stress; high-temperature heat treatment is eliminated; and the service life of an abrasion-resistant part is obviously prolonged.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant metal materials, and relates to a high-boron cast steel, in particular to a high-hardenability high-boron cast steel and a preparation method thereof. Background technique [0002] Abrasion is a common phenomenon in many industrial sectors such as metallurgy, mining, machinery, electric power, coal, petroleum, transportation, military industry, etc., and has become an important cause of equipment failure or material damage. Abrasion causes great consumption of materials and huge energy. Waste is one of the problems that cause the most economic losses. The development of new wear-resistant materials and low-cost wear-resistant materials is a topic of widespread concern at home and abroad. At present, the widely used anti-wear materials are mainly nickel hard cast iron, high chromium cast iron and alloy wear-resistant steel. Due to the lack of wear-resistant hard phase in alloy wear-resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/54C22C38/42C22C38/02C22C33/04
CPCC22C33/04C22C38/02C22C38/42C22C38/54C22C38/58
Inventor 邢建东易艳良李烨飞高义民郑开宏王娟路亚芳
Owner XI AN JIAOTONG UNIV
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