Method for treating sulfur free-cutting alloy steel
US6890389B2 · kind B2 · utility
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8Claims
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Key dates
| Filing date | Jul 18, 2002 |
| Grant date | May 10, 2005 |
| Priority date | — |
| Expiry date | Jul 18, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB08B3/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
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/cm2 in watt density at a frequency of 40 KHz or a multi frequency in the solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.