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High-nitrogen nickel-free stainless steel powder and preparation method and application thereof

A stainless steel and powder technology, applied in the field of high-nitrogen nickel-free stainless steel powder and its preparation, can solve the problems of long production process, complex process, high production cost, etc., achieve good economic and social benefits, broad application prospects, and low equipment investment Effect

Pending Publication Date: 2022-07-12
GUANGZHOU NALIAN MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has a long production process and complicated process, resulting in high production cost and low efficiency, and impurities are easily introduced during the ball milling process, and the sphericity of the powder is poor.
In addition, the stainless steel powder prepared by the water-air combined atomization method has a small particle size, but the powder has a high oxygen content and poor fluidity; the spherical powder prepared by the rotating electrode method has a high degree of sphericity and a low oxygen content, but due to the limitation of the rotation speed of the equipment, the produced powder larger granularity
[0006] Or a method of obtaining a high-nitrogen nickel-free stainless steel powder by water atomization after mixing and smelting a variety of raw materials to obtain a metal solution. The powder produced by this method has a low nitrogen content, and its content is not easy to control, and the powder sphericity is poor. high oxygen content

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  • High-nitrogen nickel-free stainless steel powder and preparation method and application thereof

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preparation example Construction

[0064] A preparation method of high nitrogen nickel-free stainless steel powder, comprising the following steps:

[0065] (1) Preparation of molten steel containing iron, molybdenum and manganese;

[0066] (2) in described molten steel, add slagging agent to carry out slag making, slag scavenging process, prepare Intermediate I;

[0067] (3) adding a deoxidizer to the intermediate I and carrying out deoxygenation treatment to prepare the intermediate II;

[0068] (4) adding chromium nitride alloy to the intermediate II, and carrying out refining treatment in a nitrogen-containing gas atmosphere to prepare intermediate III;

[0069] (5) using nitrogen gas with a temperature of ≤23° C. as the atomization medium, performing atomization and powdering treatment on the intermediate III to prepare metal powder;

[0070] (6) Using nitrogen gas as a cooling medium to cool the metal powder.

[0071] Through slag treatment, impurities in molten steel are removed and the purity is impr...

Embodiment 1

[0109] The present embodiment provides a high nitrogen nickel-free stainless steel powder and a preparation method thereof, specifically:

[0110] The raw materials include pure iron, chromium nitride, electrolytic manganese, and pure molybdenum plate. The ratio of raw materials: pure iron 130.6Kg; molybdenum slab 7.1Kg; electrolytic manganese 22.5Kg; chromium nitride 39.2Kg.

[0111] 1. Melting process:

[0112] (1) Preparation of molten steel containing iron, molybdenum and manganese:

[0113] Add 130.6Kg of pure iron into the intermediate frequency furnace and turn on the intermediate frequency power supply; when the pure iron is completely melted, add 7.1Kg of pure molybdenum plate; 5 minutes after adding the pure molybdenum plate, add 22.5Kg of electrolytic manganese; after the electrolytic manganese is completely melted, the temperature is 1400 ℃ iron, molybdenum, manganese-containing molten steel.

[0114] (2) Preparation of Intermediate I:

[0115] The molten steel ...

Embodiment 2

[0131] The present embodiment provides a high nitrogen nickel-free stainless steel powder and a preparation method thereof, specifically:

[0132] The raw materials include pure iron, chromium nitride, electrolytic manganese, and pure molybdenum plate. The ratio of raw materials: pure iron 130.6Kg; molybdenum slab 7.1Kg; electrolytic manganese 22.5Kg; chromium nitride 39.2Kg.

[0133] 1. Melting process:

[0134] (1) Preparation of molten steel containing iron, molybdenum and manganese:

[0135] Add 130.6Kg of pure iron into the intermediate frequency furnace and turn on the intermediate frequency power supply; when the pure iron is completely melted, add 7.1Kg of pure molybdenum plate; 5 minutes after adding the pure molybdenum plate, add 22.5Kg of electrolytic manganese; after the electrolytic manganese is completely melted, the temperature is 1400 ℃ iron, molybdenum, manganese-containing molten steel.

[0136] (2) Preparation of Intermediate I:

[0137] The molten steel ...

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Abstract

The invention relates to high-nitrogen nickel-free stainless steel powder and a preparation method and application thereof. The method comprises the following steps: (1) preparing molten steel containing iron, molybdenum and manganese; (2) a slagging agent is added into the molten steel for slagging and slag salvaging treatment, and an intermediate I is prepared; (3) adding a deoxidizing agent into the intermediate I for deoxidizing treatment to prepare an intermediate II; (4) adding chromium nitride alloy and / or molybdenum nitride alloy into the intermediate II, and carrying out refining treatment in a nitrogen-containing gas atmosphere to prepare an intermediate III; (5) nitrogen with the temperature smaller than or equal to 23 DEG C is adopted as an atomization medium, atomization powder preparation treatment is conducted on the intermediate III, and metal powder is prepared; and (6) nitrogen is adopted as a cooling medium, and cooling treatment is conducted on the metal powder. According to the method, the high-nitrogen nickel-free stainless steel powder which is narrow in particle size distribution, low in oxygen content, high in sphericity degree, high in nitrogen content and stable and easy-to-control in nitrogen content can be prepared, and the high-nitrogen nickel-free stainless steel powder can be applied to injection molding, 3D printing or powder metallurgy.

Description

technical field [0001] The invention relates to the technical field of stainless steel powder, in particular to a high-nitrogen nickel-free stainless steel powder and a preparation method and application thereof. Background technique [0002] Nitrogen is a strong austenitic stabilizer that plays an important role in austenitic stainless steels and is often used to replace the expensive and dangerous element nickel. In addition, the addition of nitrogen can effectively improve the corrosion resistance and mechanical properties of austenitic stainless steel. Even if a trace amount of nitrogen is added to austenitic stainless steel, its properties are significantly improved. At present, according to the nitrogen-increasing mechanism in austenitic stainless steel, high-nitrogen nickel-free austenitic stainless steel ingots are mainly prepared by pressure smelting method. In the process of machining parts, there is a problem that a lot of leftovers are wasted. In addition, due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/065B33Y70/00C21C7/00C21C7/06C21C7/076C22C38/02C22C38/22C22C38/38
CPCB22F9/082C21C7/06C21C7/0006C21C7/0087C21C7/076C22C38/38C22C38/22C22C38/001C22C38/02B33Y70/00B22F2009/0848B22F2009/0824B22F2009/0876B22F2009/0896Y02P10/20
Inventor 郭雷明李博张少驰
Owner GUANGZHOU NALIAN MATERIAL TECH CO LTD