Wear-resisting low-carbon steel shot, preparation method thereof and centrifugal atomizing device

Abstract

The invention relates to a wear-resisting low-carbon steel shot, a preparation method thereof and a centrifugal atomizing device, and belongs to the technical field of metal abrasives. The wear-resisting low-carbon steel shot consists of the following chemical components in percentage by mass: 0.1-0.3% of C, 0.2-1.0% of Si, 0.3-1.2% of Mn, 0-0.05% of S, 0-0.05% of P, 0.1-0.2% of Ti, 0.07-0.2% of Mo, 0.1-0.2% of V, 0.1-1.1% of Cr and the balance of Fe. The preparation method comprises the following steps: smelting, centrifugal atomizing and forming, drying, coarse screening, quenching and tempering. The centrifugal atomizing device comprises a water storage tank, a centrifugal rotary plate and a centrifugal atomizing tank, wherein the centrifugal atomizing tank sequentially passes through a water outlet pump, the water storage tank and a water inlet pump to form a circulating loop; the upper part of the centrifugal atomizing tank is provided with a centrifugal rotary plate; and the top of the centrifugal atomizing tank is provided with ring-shaped water slots which are distributed along the circumference. The wear-resisting low-carbon steel shot has the characteristics of impact resistance, high cleaning efficiency and fatigue resistance, and has wear-resisting times up to 3500-3600 times; the preparation method is simple and good in thermal treatment effect; and the used centrifugal atomizing device is simple in structure, low in cost and easy to realize.

Description

technical field [0001] The invention relates to a wear-resistant low-carbon steel shot, a preparation method thereof and a centrifugal atomization device, belonging to the technical field of metal abrasives. Background technique [0002] Cast steel shot is a spherical or near-spherical metal abrasive for shot peening and strengthening formed by atomizing molten steel containing a certain composition through an atomizing device. Compared with traditional iron shot, cast steel shot has the characteristics of moderate hardness, strong toughness, impact resistance, strong adhesion and long service life. According to the difference in composition and performance, cast steel shot is divided into high carbon cast steel shot, medium carbon cast steel shot and low carbon cast steel shot. High carbon steel shot has high carbon content. There are many surface cracks after the martensite structure, and the coarse martensite structure in the as-cast state must be changed through seconda...

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Problems solved by technology

According to the difference in composition and performance, cast steel shot is divided into high carbon cast steel shot, medium carbon cast steel shot and low carbon cast steel shot. High carbon steel shot has high carbon content. There are many surface cracks after the martensite structure, and the coarse martensite structure in the as-cast state must be changed through secondary quenching and high temperature tempering. The cracks will further expand during the secondary quenching process, resulting in high brittleness and impact resistance; low carbon steel Compared with the traditional high-carbon steel shot, the production of the shot omits the secondary quenching and high-temperature tempering process, which greatly reduces the production cost, while the low-carbon steel shot has low carbon content, low hardness and non-wear resistance. Moreover, due to the high melting point, the fluidity of molten steel is poor and the shrinkage is large, resulting in loose and hollow defects in the steel shot. Therefore, it is necessary to further study the low-carbon steel shot and its wear resistance.

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