| 摘要 |
In order to remove or decrease fine granular sulfides of Mn, Cr, Mo, etc. (Mn-S, Cr-S, Mo-S, etc.) left on a machined workpiece surface of sulfur free-cutting alloy steel without affecting the form and dimensional accuracy thereof, there is provided a method for treating the sulfur free-cutting alloy steel which comprises a soaking process of the machined workpiece in a solvent and an ultrasonic cleaning process by applying ultrasonic waves of 1.0 to 2.0 W/cm<SUP>2 </SUP>in watt density at a frequency of 40 KHz or a multi frequency in the solvent.
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