Manufacturing method of alloy steel powder by spraying

Abstract

A process for preparing water-atomized alloy steel powder features that the original step such as smelting, water atomizing, dewatering, drying and high-temp. reducing are all such improved that the time and sequence for adding alloy elements in the smelting step are optimized, and the protection of inertial gas is used in the other steps for controlling the oxygen content of product to less than0.15%. Its advantages are high quality of product and low cost.

Description

Technical field: [0001] The invention belongs to the field of powder metallurgy, in particular to a method for manufacturing alloy steel powder. Background technique: [0002] Water atomized alloy steel powder is a high-performance steel powder that has appeared in recent years. It mainly uses high-quality scrap steel as raw material. During the smelting process, alloy elements such as Ni, Mo, Cu, Co, Cr, and Mn are added. It is produced through the processes of atomization, dehydration, drying, magnetic separation, screening, batching, high-temperature reduction, disintegration, screening, and batch packaging. Due to the addition of alloying elements in the smelting process, the final product powder has achieved the effect of complete alloying, the alloy components in the particles are evenly distributed, without segregation, and have uniform sintering physical and chemical properties, which can be used to produce uniform sintering structural parts. At the same time, due ...

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Problems solved by technology

At present, domestic and foreign powder metallurgy manufacturers mostly use intermediate frequency induction furnaces and electric arc furnaces as smelting equipment, and alloy elements are added in the later stage of oxidation during the smelting process. It is easy to combine with oxygen to form oxides, resulting in high oxygen content in iron powder. Therefore, a vacuum annealing furnace must be used in the subsequent reduction process to complete the reduction annealing process at a higher temperature, which brings the following two problems. : 1) Large equipment investment and high production cost

Due to the high cost of the vacuum annealing furnace itself, the high cost of operation and maintenance, and the inability to achieve continuous production, the cost of the final product is too high, and it is not suitable for large-scale industrial production in my country.

2) Due to the lack of protective measures in the process of smelting, water atomization and drying, the raw powder is seriously oxidized. Even if the vacuum annealing process is used, the oxygen content of the final powder product is still high

Therefore, the development and production of water atomized alloy steel powder and the popularization and application of products have been affected.

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