A kind of high nitrogen stainless steel powder and preparation method thereof, stainless steel

A high-nitrogen stainless steel and stainless steel technology, applied in the field of steel materials, can solve the problems of difficult balance between nitrogen content and density, low yield rate, etc., and achieve the effect of high strength and high density

Active Publication Date: 2021-08-24
HUNAN HENGJI POWDER TECH
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Problems solved by technology

[0003] Powder injection molding technology has been widely used, but in the process of using injection molding technology to prepare high-nitrogen stainless steel, it is found that there is a problem of low yield rate in the process of molding and firing stainless steel powder purchased directly from the market, which is specifically reflected in Nitrogen content and density are difficult to balance

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  • A kind of high nitrogen stainless steel powder and preparation method thereof, stainless steel

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Embodiment 1

[0025] A high-nitrogen stainless steel powder is composed of stainless steel powder matrix 0Cr17Mn11Mo3N and titanium powder. Among them, the amount of titanium powder added accounts for 1% of the total powder mass, the particle size of the stainless steel powder matrix is ​​10-25 μm, of which D50 is 17 μm, and the particle size of titanium powder is 5-10 μm, of which D50 is 8 μm.

[0026] The preparation method of the above-mentioned high-nitrogen stainless steel powder comprises the following steps: weighing 200 g of the stainless steel powder matrix, weighing titanium powder according to 1% of the total mass of the powder, and putting the two kinds of powders into a stainless steel ball mill tank with a volume of 1 L; Put 1000g of stainless steel balls with a diameter of 5mm, adopt a ball-to-material ratio of 5:1, use stearic acid as a ball milling aid (amount of 1wt.%), feed Ar gas as a protective atmosphere, and the stirring axis speed of the ball mill is 3m / s, ball mill...

Embodiment 2

[0045] A high-nitrogen stainless steel powder is composed of a stainless steel powder matrix 0Cr17Mn11Mo3N and niobium powder. Among them, the amount of niobium powder added accounts for 0.8% of the total powder mass, the particle size of the stainless steel powder matrix is ​​10-25 μm, of which D50 is 17 μm; the particle size of niobium powder is 7-12 μm, of which D50 is 9 μm.

[0046] The preparation method of the above-mentioned high-nitrogen stainless steel powder comprises the following steps: taking 200 g of the stainless steel powder matrix, weighing niobium powder according to 0.8% of the total mass of the powder, and putting the two kinds of powders into a stainless steel ball mill tank with a volume of 1 L; Load 1000 g of stainless steel balls with a diameter of 5 mm, adopt a ball-to-material ratio of 5:1, use absolute ethanol as a ball milling aid (amount of 5 wt.%), feed Ar gas as a protective atmosphere, and the stirring axis speed of the ball mill is 5 m / s, ball...

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Abstract

The invention discloses a high-nitrogen stainless steel powder, comprising a stainless steel powder matrix 0Cr17Mn11Mo3N, and at least one of an additive titanium powder or a niobium powder, and the amount of the additive accounts for 0.75-1.1% of the total powder mass. The present invention also provides a method for preparing the above-mentioned high nitrogen stainless steel powder, which includes the following steps: putting titanium powder or niobium powder and a stainless steel powder matrix into a ball milling tank, then adding stainless steel balls, then adding ball milling aids, and protecting them in Ar Then, the high nitrogen stainless steel powder is obtained by ball milling. The present invention also provides a high-nitrogen stainless steel prepared from the above-mentioned high-nitrogen stainless steel powder by injection molding. The high nitrogen stainless steel finally obtained in the present invention has a nitrogen content of 0.85-1.2wt.%, a density of 96.9-98.6%, and a tensile strength of 1091-1267MPa, which can maintain high strength while having high density. .

Description

technical field [0001] The invention belongs to the field of steel materials, and in particular relates to a stainless steel powder, a preparation method thereof, and stainless steel. Background technique [0002] In recent years, nitrogen as one of the alloying components of steel has been paid more and more attention, especially for the nitrogen addition of stainless steel, there have been a lot of research. Nitrogen is easier to dissolve in the austenite phase of stainless steel than carbon, and has the effect of delaying the precipitation of carbides, and can effectively improve the strength and corrosion resistance of steel. In fact, the effect of nitrogen in steel has attracted people's attention very early. In the 1930s, due to the war, nickel resources as a strategic material were scarce. The development of nickel stainless steel is expected to improve corrosion resistance and strength through high nitriding of stainless steel, stabilize the austenite phase and repl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/04B22F3/22
Inventor 何浩吴楚陈永志寻裕平何哲宇李东阳
Owner HUNAN HENGJI POWDER TECH
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