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1·In this thesis, series of low carbon cast steel shot were successfully obtained by medium-frequency melting and centrifugal atomization technologies and temper were performed.

采用中频熔炼、离心雾化凝固冷却得到铸态低碳铸钢丸，并对此进行相应回火处理得到不同硬度及寿命的低碳铸钢丸。

2·The ranges of temper hardness are given: 4 for carbon steel and 8 for alloy steel.

给出了常用的调质硬度范围，普碳素钢4档，合金钢8档；