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Low carbon cast steel pellet

A cast steel shot and chemical composition technology, which is applied in the field of carbon cast steel shot, can solve the problems of shot shape, metal structure record, poor shot shape, and rising raw material cost, and achieve stable shot blasting ability, small hardness deviation, uniform shape effect

Active Publication Date: 2013-01-02
SINTOKOGIO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In the low-carbon cast steel shot having the chemical composition specified in JIS Z0311 (2004), Mn and Si are set higher in order to improve the hardenability, but since Mn and Si are extremely strong with oxygen Alloying elements and molten metals tend to oxidize, so there is a problem that the shape of the pellets is poor, and the ratio of non-spherical particles such as spindles and rods other than roughly spherical shapes is high.
[0014] In Patent Document 1, 0.80% to 1.20% of Ni is added, but Ni is a relatively expensive alloy element, which has the problem of increasing raw material costs.
In addition, although it is described in Patent Document 1 that HRC (Rockwell hardness) 45 and excellent durability are obtained, the shape and metal structure of the shot are not described, and the details are unknown.

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 3

[0076] Embodiment 3 represents the chemical composition of technical scheme 1 or technical scheme 2. In claim 2, in order to stabilize the quality of the pellets, the contents of Si, Mn, and Cr are set within narrower ranges. Compared with Examples 1-2, Example 3 has slightly improved porosity, non-spherical particle ratio, and lifetime ratio. In addition, regarding P and S, since the content of P and S can be reduced to 0.03% or less by using generally available raw materials such as steel chips, the content of P and S is simply omitted so that the content of P and S is 0.03% to 0.05%. % way to adjust the chemical composition to carry out comparative experiments. The metal structure of Example 3 is a bainite structure.

[0077] Embodiment 4 to embodiment 6 represent the chemical composition of technical scheme 3. The above examples show the results of adding Ni and Cu alone or in combination. Compared with Examples 1 to 3, the porosity and hardness are at the same level, b...

Embodiment 7

[0080] Embodiment 7 represents the chemical composition of technical scheme 4. This example shows the results of the addition of Mo. Compared with the case of adding Ni and Cu alone or simultaneously, the life ratio is increased, the hardness is also increased by about Hv10, and the variation in hardness is reduced ( figure 1 ). The metal structure of Example 7 is a bainite structure.

[0081] Mo is an element next to Mn that efficiently improves the hardenability of steel, and makes the metal structure finer and more uniform. On the other hand, in Comparative Example 10 in which the Mo content was less than 0.10%, no changes in the hardness and life ratio were observed, and in Comparative Example 11 in which the Mo content exceeded 0.30%, the hardness was further improved. Relatively, the life ratio is reduced. The metal structures of Comparative Examples 10 to 11 were bainite structures.

Embodiment 8

[0082] Embodiment 8 represents the chemical composition of technical scheme 5. Example 8 shows the results in the case where Ni and Cu were added simultaneously and Mo was added. Compared with Examples 4 to 6, the service life was relatively high and the hardness was increased, and the variation in hardness was also reduced. The metal structure of Example 8 is a bainite structure.

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Abstract

The invention aims at providing a low carbon cast steel pellet low in raw material cost, uniform in shape, comparatively low in rigid deviation of metal texture and stable in clearing capability through optimizing a chemical composition including the containing volume of micro constituents. The low carbon cast steel pellet is characterized in that the low carbon cast steel pellet has the chemical composition of, by mass, 0.1 percent to 0.25 percent of C, 0.1 percent to 0.3 percent of Si, 0.4 percent to 1.0 percent of Mn, 0.3 percent to 1.0 percent of Cr, less than 0.05 percent of p, 0.05 percent of S, and the rest of Fe and unavoidable impurities.

Description

technical field [0001] The invention relates to a carbon cast steel shot. In more detail, the present invention relates to a low-carbon cast steel shot with uniform shape, small deviation of metal structure and hardness, and stable shot blasting ability. Background technique [0002] Conventionally, cast steel shot has been used in a wide range of applications. Cast steel shot is mainly used in a wide range of applications, including sand cleaning of castings, deburring of ferrous metal materials, removal of deposits, and removal of oxide films. [0003] Cast steel shot is generally divided into high-carbon cast steel shot and low-carbon cast steel shot, and its chemical composition and quality are standardized. For example, Japan has regulations in JIS Z0311 (2004). [0004] Since the high-carbon cast steel shot contains 0.80% to 1.2% of C, the quenching hardness can be improved, so it can be mechanically pulverized to produce scrap metal. Since crushed metal is widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/40C22C38/42C22C38/22C22C38/44C22C38/32C22C38/54C22C38/26C22C38/24
Inventor 山本孝平井薰
Owner SINTOKOGIO LTD
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