Method for performing Yt-based heavy rare earth modification on high manganese steel

A technology of rare earth modification and high manganese steel, which is applied in the field of metal material modification, can solve the problems of wear, low yield strength of high manganese steel, easy deformation, etc., and achieve the effect of high cost performance and simple operation process

Inactive Publication Date: 2008-10-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low yield strength of high manganese steel, it is easy to deform when it is first used, which will cause greater wear
[0003] In recent years, some studies have been carried out on improving the structure and performance of high manganese steel by using rare earth modification, but they are all focused on t

Method used

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  • Method for performing Yt-based heavy rare earth modification on high manganese steel
  • Method for performing Yt-based heavy rare earth modification on high manganese steel
  • Method for performing Yt-based heavy rare earth modification on high manganese steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Smelting: smelting scrap steel, adding ferromanganese, after the charge is completely melted, adding fluorite and quicklime to remove slag, and then inserting pure aluminum to remove oxygen, the insertion amount is 1.2Kg / ton steel.

[0023] (2), the addition of rare earth modifier

[0024] The yttrium-based heavy rare earth is baked, the baking temperature is 250° C., and the baking time is 8 minutes.

[0025] (3), pouring

[0026] The molten molten steel is flushed into the ladle, and the discharge temperature is 1410 °C, the molten steel is sedated for 10 minutes, and then poured, and the pouring temperature is 1400 °C.

[0027] (4), water toughness treatment

[0028] The castings are treated with water toughening, the temperature is 1060℃, the heat preservation is 90min, and the quality of the cooling water is 10 times that of the castings.

Embodiment 2

[0030] (1) Smelting: smelting scrap steel, adding ferromanganese, after the charge is completely melted, adding fluorite and quicklime to remove slag, and then inserting pure aluminum to remove oxygen, the insertion amount is 1.6Kg / ton steel.

[0031] (2), the addition of rare earth modifier

[0032] The yttrium-based heavy rare earth is baked at a baking temperature of 200°C and a baking time of 12 minutes. The baked rare earth is placed at the bottom of the ladle, the size of the rare earth is 12 mm, and the amount of rare earth added is 0.3%.

[0033] (3), pouring

[0034] The molten molten steel was flushed into the ladle, and the temperature was 1430°C, the molten steel was sedated for 12 minutes, and then poured at a temperature of 1425°C.

[0035] (4), water toughness treatment

[0036] The castings are treated with water toughening, the temperature is 1080℃, the holding time is 90min, and the quality of the cooling water is 15 times that of the castings.

Embodiment 3

[0038] (1) Smelting: smelting scrap steel, adding ferromanganese, after the charge is completely melted, adding fluorite and quicklime to remove slag, and then inserting pure aluminum to remove oxygen, the insertion amount is 1.8Kg / ton steel.

[0039] (2), the addition of rare earth modifier

[0040] The yttrium-based heavy rare earth is baked, the baking temperature is 150° C., and the baking time is 15 minutes.

[0041] (3), pouring

[0042] The molten molten steel is flushed into the ladle, and the temperature is 1460 °C, the molten steel is sedated for 15 minutes, and then poured, and the pouring temperature is 1450 °C.

[0043] (4), water toughness treatment

[0044] The castings are treated with water toughening, the temperature is 1100℃, and the quality of the cooling water is 20 times that of the castings.

[0045] Implementation result:

[0046] (1) The microstructure of the high manganese steel after the modification of the yttrium-based heavy rare earth has been...

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Abstract

A method for carrying out illinium group heavy rare earths modification to timang is disclosed, the invention relates to a process for using the rare earths modification to improve the organization of timang and enhance the mechanics performances, belonging to the technical field of metal material modification, comprising the steps of: firstly, melting the waste steel, adding ferromanganese, after furnace materials are completely melted, adding fluorite and calces to remove clinker, then inserting pure aluminum to remove oxygen, then filling into a ladle comprising the heavy rare earths at the temperature ranging from 1410-1460 DEG C, casting after poise, eventually, performing water toughening to the cast. As the addition of illinium group rare earth, nucleation core is increased and austenite grain growth is prohibited, the austenite grain is thinned and has improved tensile strength and impact toughness. The method of the invention efficiently solves the issue about severe initial abrasion of the timang, thus greatly improving the service life and increasing the ratio of performance to price.

Description

technical field [0001] The invention relates to a process for improving the structure and mechanical properties of high-manganese steel by adopting rare earth modification treatment on high-manganese steel, and belongs to the technical field of metal material modification. Background technique [0002] As a traditional wear-resistant material, high-manganese steel is unmatched by other materials in terms of resisting abrasive wear or chisel wear under the action of strong impact and high pressure. The as-cast structure of high-manganese steel is austenite, carbide and a small amount of pearlite. After water toughening treatment, all or most of the carbide is dissolved in austenite to obtain single-phase austenite or austenite with a small amount of austenite. Carbide structure, so it has good plasticity and toughness. Under the action of a large impact load or contact stress, the surface layer rapidly produces work hardening and forms martensite and ε phase to slip along th...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/04
Inventor 蒋业华黄汝清李祖来周荣杨乘东
Owner KUNMING UNIV OF SCI & TECH
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