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Free-cutting water-atomized steel powder and preparation method thereof

A technology of steel powder and manufacturing method, which is applied in the field of powder metallurgy to achieve the effects of short process flow, high production efficiency and improved cutting performance

Active Publication Date: 2012-11-21
ANGANG (ANSHAN) METALLURGY POWDER MATERIAL CO LTD
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Problems solved by technology

[0003] Patent No. ZL94117334.8 discloses an "atomized iron powder with excellent machinability and dimensional accuracy" in which the composition of S is strictly limited S content: 0.005~0.3%, this method improves the cutting performance of sintered steel, but its technical solution has certain limitations, that is, the control of S content limits the improvement of cutting performance

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  • Free-cutting water-atomized steel powder and preparation method thereof

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Embodiment Construction

[0012] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0013] The manufacturing method of free-cutting water atomized iron and steel powder includes smelting, water atomization and reduction, and the method of adding high-sulfur ferroalloy is used to control the content of S in the iron and steel powder. The operation steps are as follows:

[0014] 1) Smelting, smelting scrap steel in an electric furnace to obtain liquid steel with uniform and stable composition and few impurities. 15 kg / ton, particle size 20~80 mesh, stir until uniform;

[0015] 2) Water atomization process parameters, the tapping temperature of molten steel is 1750±10°C, the atomization start temperature is 1680±10°C, the atomization end temperature is 1650±5°C, the diameter of molten steel flow is 30-35 mm, the molten steel mist The melting speed is 3.1~3.8kg / s, the high pressure water pressure is 115±10 MPA, and the flow rate is ...

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Abstract

The invention belongs to the powder metallurgy field and particularly relates to a preparation method of free-cutting water-atomized steel powder. The method comprises the following steps of smelting, water atomization and reduction. The method provided by the invention is characterized in that the S content in the steel powder is controlled by adding high sulfur iron alloy. The method comprises the following operation steps: 1) smelting; 2) performing the water atomization technology; and 3) reducing. The free-cutting water-atomized steel powder prepared by the method comprises the followingchemical components in percentage by weight: 0.10-0.20% of C, 0.20-0.35% of Si, 0.10-0.30% of Mn, 0-0.01% of P, 0.30-0.45% of S, 1.1-1.5ppm of [o] and balance of Fe and inevitable impurities. The water-atomized steel powder has the following beneficial effects: the used steel scrap raw material has low cost, the cutting property can be effectively improved, the service life of the cutting tool can be increased, and the steel powder is suitable for large-scale powder metallurgical products.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, in particular to a free-cutting water atomized iron and steel powder and a manufacturing method thereof. Background technique [0002] Free-cutting water-atomized steel powder is mainly used in the production of high-strength, high-density, high-dimensional precision powder metallurgy parts such as automotive engine parts and gearbox synchronizer hubs. Afterwards, cutting and drilling are performed, so the product is required to have excellent cutting performance. There are many solutions to improve the cutting performance of powder, most of which are to add fast cutting components such as S or MnS to the powder, but due to the fine particles of S or MnS powder, the components of the free-cutting mixture powder produced are not mixed uniformly, so the sintered products The cutting performance is not good, and it is easy to damage the cutter head. [0003] The invention with the patent number ZL...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22B22F9/08C21C5/52C22C38/60B22F1/00
CPCY02P10/20
Inventor 安喜锋卜福昌张文峰纪向军
Owner ANGANG (ANSHAN) METALLURGY POWDER MATERIAL CO LTD
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