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steel projection material

A technology of shot peening and cooling medium, which is applied in the field of steel-based projection materials, can solve the problems of uneven finish of shot peening surface, large deviation of metal structure and hardness, fast consumption of projection materials, etc., to reduce the composition range and reduce the quality The effect of deviation

Active Publication Date: 2017-03-01
SINTOKOGIO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if there is such a wide range of compositional deviations, it has a sufficient effect on the realization of the treatment purpose of casting shakeout and steel plate oxide removal. However, due to the large deviations in the metal structure and hardness of each steel shot, there are spraying There are problems such as unevenness in the finish of the ball surface or rapid consumption of projection materials

Method used

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Examples

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Effect test

Embodiment 1

[0028] In Examples 1 to 3, the chemical composition of the first aspect of the present invention was adjusted so that P and S were 0.04 to 0.05%, and the effects of C, Si, and Mn were investigated in particular. Example 1 is a composition in which C, Si, and Mn are close to the lower limit, Example 2 is a composition in which C, Si, and Mn are close to the upper limit, and Example 3 is the most common composition. The porosity, non-spherical particle ratio, and lifetime ratio of the samples of Examples 1 to 3 are not much different.

[0029] In contrast, in Comparative Example 1 in which C, Si, and Mn were lower than the composition lower limit of the first embodiment of the present invention, the porosity and non-spherical particle ratio increased, but the lifetime ratio decreased significantly. This is because the deoxidation effect at the time of melting is insufficient because C, Si, and Mn are low, and defects such as voids increase. In addition, in comparison 2 in which...

Embodiment 4

[0030] In Example 4, the influence of Al was investigated. As a result, when Al was contained in the range of 0.04 to 0.12% by mass, the porosity and non-spherical particle ratio were significantly reduced, and the lifetime ratio was also improved. This is considered to be due to the deoxidizing effect of Al.

[0031] In contrast, in Comparative Example 3 in which Al exceeded the upper limit of the range of 0.04 to 0.12% by mass %, although the porosity was low, the non-spherical particle ratio increased and the lifetime ratio also decreased. This is considered to be due to the increase of oxides formed on the surface of the melt in the case of excess Al, thereby suppressing the surface tension and degrading the shape.

Embodiment 5

[0032] In Example 5, the influence of Cr was investigated. As a result, the porosity and non-spherical The particle rate was significantly reduced, and the lifetime ratio was also increased, giving excellent results.

[0033] On the other hand, in Comparative Example 4 in which Cr exceeded the upper limit of the range of 0.1 to 1.2% by mass %, the non-spherical particle ratio increased compared with Example 5, and the lifetime ratio decreased. It is presumed that when Cr is excessive, oxides formed on the surface of the melt increase to deteriorate the shape as in the case of Al, and at the same time, carbides of Cr tend to be formed, thereby reducing toughness.

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Abstract

The invention provides a steel projection material used for the treatment of shot blasting. In the prior art, the widely adopted projection material used for the treatment of shot blasting contains 0.6-1.4 % of C by mass, 0.3-1.6 % of Si by mass, 0.3-1.3 % of Mn by mass, 0.05 % or less of P by mass and 0.05 % or less of S by mass, wherein the completed surface of shot blasting is non-uniform or the projection material is quickly consumed. The projection material used for the treatment of shot blasting provided by the utility model is characterized by comprising 0.7-1.2 % of C by mass, 0.4-1.5 % of Si by mass, 0.35-1.2 % of Mn by mass, 0.05 % or less of P by mass and 0.05 % or less of S by mass, while the remaining part consists of Fe and unavoidable impurities.

Description

technical field [0001] The present invention relates to a steel-based projectile material with small variations in quality (hardness, density, metal structure) and stable shot blasting ability. Background technique [0002] Generally, cast steel containing about 1% by mass of C is widely used to manufacture iron and steel-based projectile materials, and it is mainly used for deflashing of iron-based metal blanks, removal of deposits, and oxidation of iron-based metal blanks starting from shakeout of castings. Wide-area applications such as membrane removal. [0003] As the projection materials used for these purposes, there are cut steel wires obtained by cutting hard steel wire rods, stainless steel cut wires manufactured by cutting stainless steel wires, and stainless steel shot produced by spraying stainless cast steel with water, etc. , but steel shot is the most popular projection material that can be manufactured at a lower cost. [0004] However, for example, when c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/32C22C38/28C22C38/60C22C38/04
Inventor 石川政行
Owner SINTOKOGIO LTD
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