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Preparation method of high-manganese non-magnetic steel powder

A technology of non-magnetic steel and high manganese, applied in the field of powder metallurgy, can solve the problems of poor powder compactability and formability, low green strength, poor density and toughness of powder metallurgy products, and achieve the effect of improving compressibility

Active Publication Date: 2018-09-28
山东鲁银新材料科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

However, the existing powder metallurgy manufacturing high manganese non-magnetic steel process, due to the high strength of Fe-Mn alloy powder, and has strong work hardening characteristics, resulting in poor powder compactability and formability, low green strength, making powder metallurgy products The density and strength and toughness are poor; and if the elemental Mn powder and Fe powder are used for ordinary compression molding, due to the sublimation of Mn at high temperature during sintering, a large vapor pressure will be generated, and the alloying of the material will be difficult, and it will not be non-magnetic, high density and strong. toughness requirements

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  • Preparation method of high-manganese non-magnetic steel powder

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preparation example Construction

[0027] In one embodiment of the present invention, the preparation method of the high manganese non-magnetic steel powder provided comprises the steps:

[0028] (1) Select high-quality common carbon steel scrap and pig iron for steelmaking, and make ingredients according to the ratio of 1:1;

[0029] (2) Dosing twice in succession, adding coke accounting for 1.5-2% of the total weight of the ingredients when adding the second batch, smelting in EBT electric furnace, refining in LF electric furnace after tapping, adding metal manganese and ferrosilicon in three times , carry out pre-alloying treatment, deoxidation treatment, adjust the composition and temperature after tapping, and prepare for atomization;

[0030] (3) Atomize spraying with 10-12MPa water pressure using annular slit nozzle, dehydration treatment by hydrocyclone and disc-type inner filter dehydrator, and indirect drying with gas to obtain primary powder;

[0031] (4) Use a fine reduction furnace to perform high...

Embodiment 1

[0050] The composition of common carbon scrap steel is: Si≤0.20%, Mn≤0.50%, P≤0.04%, S≤0.04%, Cr+Ni+Cu+Mo≤0.20%; the composition of steelmaking pig iron is: Si≤0.45% , Mn≤0.40%, P≤0.07%, S≤0.07%, Cr+Ni+Cu+Mo≤0.20%. According to scrap steel: pig iron = 1:1 ratio (weight ratio), the ingredients are added to the EBT electric furnace as raw materials, and about 300Kg of coke is added to the bottom of the secondary material (the amount of coke added is 1.5-2% of the total weight of the raw materials). Coke requirements: lumpiness Diameter: 3-5cm, C 固 ≥80%, S≤0.50%. Detection before tapping: temperature: 1645°C, C: 0.15%, Si: 0.04%, Mn: 0.12%, P: 0.010%, S: 0.030%, rapid tapping (prohibit oxidation slag from flowing into the ladle).

[0051] Use the tapping flat car to send to the refining station, use the LF refining furnace to refine, use argon gas to stir for 2 minutes before power transmission and refining; after the power transmission and refining start, manually add an appro...

Embodiment 2

[0055] The composition of common carbon scrap steel is: Si≤0.20%, Mn≤0.50%, P≤0.04%, S≤0.04%, Cr+Ni+Cu+Mo≤0.20%, and the composition of steelmaking pig iron is: Si≤0.45% , Mn≤0.40%, P≤0.07%, S≤0.07%, Cr+Ni+Cu+Mo≤0.20%. According to the ratio of scrap steel: pig iron = 1:1, the ingredients are fed into the furnace, and the secondary material is mixed with 260Kg coke blocks. Coke requirements: block diameter: 3-5cm, C 固 ≥80%, S≤0.50%. Detection before tapping: temperature: 1650°C, C: 0.19%, Si: 0.03%, Mn: 0.10%, P: 0.008%, S: 0.032%, fast tapping (prohibit oxidation slag from flowing into the ladle), use tapping flat The car is sent to the refining station. Before power transmission and refining, use argon gas to stir for 2 minutes; after power transmission and refining, manually add synthetic slag, add 20Kg of ferrosilicon as deoxidizer, use quicklime as desulfurizer, white slag refining time is not After less than 10 minutes, the temperature was raised to 1650°C, and 1t of m...

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Abstract

The invention discloses a preparation method of high-manganese non-magnetic steel powder. The preparation method comprises the following steps that (1), steel scrap of plain carbon steel and steelmaking pig iron are taken as raw materials, and secondary materials are added for smelting; (2), refining is carried out after the steel is smelted, metal manganese and ferrosilicon are added, and pre-alloying treatment and deoxidation treatment are carried out; (3), high-pressure atomization, dehydration and drying treatment are carried out on the refined steel to prepare primary powder; and (4), high-temperature reduction, crushing and sieving treatment are carried out on the primary powder to obtain the high-manganese non-magnetic steel powder. According to the preparation method, the plain carbon steel scrap steel and the pig iron are used as the raw materials, the high-manganese non-magnetic steel powder with proper loose packing density and good pressing performance is prepared by adopting a water atomization method, and the method is suitable for production of high-density and high-strength powder metallurgy non-magnetic structural parts.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a preparation method of high manganese non-magnetic steel powder. Background technique [0002] High-manganese non-magnetic steel has the advantages of high hardness, high wear resistance, high strength, and low magnetic permeability, so it has become an important material related to people's livelihood and civilian use in electric power, transportation, and nuclear industries. In industry, high manganese non-magnetic steel products are generally obtained by casting, but due to its obvious work hardening, it is difficult to prepare small parts with high precision requirements. Powder metallurgy technology has a series of advantages such as energy saving, material saving, excellent performance, high product precision and good stability, and can be used to prepare complex parts. However, the existing powder metallurgy manufacturing high manganese non-magnetic steel proce...

Claims

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Application Information

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IPC IPC(8): B22F9/08B22F1/00C22C33/04C22C38/02C22C38/04
CPCC22C33/04C22C38/02C22C38/04B22F9/082B22F1/14
Inventor 于永亮李普明吴爱杰袁勇刘增林张德金韩帅仇朋刘曌娲
Owner 山东鲁银新材料科技有限公司
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