Water atomizing steel powder used for high-compressibility sintering hardening and production method thereof

Abstract

The invention relates to water atomizing steel powder used for high-compressibility sintering hardening and a production method thereof. The water atomizing steel power comprises the following raw material components by weight percent: 1.0% of nickel, 1.0% of manganese, 2.0% of copper and the balance of iron, wherein water atomizing pure iron powder with compressibility more than 7g / cm<3> under the condition of 600Mpa is adopted as basal power, and is dispersed in a reduction annealing furnace together with 300 meshes of copper powder and Ni-50Mn alloy powder atomized by adopting inert gases,thus obtaining the water atomizing steel powder used for high-compressibility sintering hardening; and when powder metallurgy parts are produced, 0.7-0.8% of graphite powder of 500 meshes and 0.7-0.8% of lubricant stearic acid zinc powder are added according to weight percent, mixed for 1 hour in a V-shaped blender mixer, and sintered for 1 hours in a sintering furnace under the temperature of 112 DEG C. The invention has the beneficial effects that the sintering hardening powder has high compressibility. Therefore, the strong sintering hardening capability of Mn is utilized effectively, and the reduction of the compressibility of the iron powder is avoided. The material cost is reduced by more than 20%, and simultaneously, the diffusion technology is more energy-saving compared with the vacuum annealing technology.

Description

technical field [0001] The invention belongs to the technical field of alloy powder manufacturing for high-performance powder metallurgy, and specifically relates to a high-compressibility sintering hardening water atomized iron and steel powder and a production method. Background technique [0002] Sinter hardening refers to the phenomenon that the strength and hardness increase during the sintering process of iron-based powder metallurgy parts. The main feature of the sinter hardening process is that on the premise of obtaining high strength and high hardness mechanical properties, the heat treatment process after sintering of iron-based parts is omitted, which reduces the production cost of the parts; at the same time, the cooling rate is much lower than that of the traditional quenching process. Avoid the deformation of parts and improve the precision of iron-based parts. [0003] At present, the Swedish Hegnas Company and the Canadian Quebec Metal Powder Company both p...

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Problems solved by technology

Taking ATOMET4701 (Fe-0.45Mn-0.45Cr-1Mo-0.9Ni pre-alloyed steel powder, adding 2% Cu and 0.75% C) from Canada Quebec Metal Powder Company as an example, the composition of the sinter-hardening powder includes Alloying elements Ni, Mo, Mn, Cr, carbon and Cu with strong hardenability are used, and as the price of raw materials generally rises, in order to reduce the cost of raw materials for powder metallurgy parts, Mn and Cr with lower cost become sintered Hardening powder is an ideal alloying element, but these alloying elements have a strong affinity with oxygen, and they are easy to form oxides during sintering, losing the strengthening effect and sintering hardening effect, so they have to use water atomization to completely pre-alloy steel powder, and pre-alloyed powder The hardness of the powder will affect the compressibility of the powder. Therefore, it is necessary to anneal the water atomized alloy steel powder containing Cr and Mn under high vacuum to reduce its microhardness. This process increases the cost of the powder to a certain extent.

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