References cited in this section

1. "Standard Practice for Cleaning and Descaling Stainless Steel Parts, Equipment, and Systems," A 380, Annual Book of ASTM Standards, ASTM, 1988

4. Cleaning and Descaling Stainless Steels, No. 9001, American Iron and Steel Institute, 1982 (reprinted by

Nickel Development Institute, 1988) Mass Finishing

Mass finishing provides methods that can be advantageously used for surface treating stainless steels include barrel finishing, vibratory finishing, and centrifugal barrel finishing. Mass finishing methods are adaptable to removal of burrs, scale, and residual flux, and they also can be used for light surface treatment, such as cleaning, burnishing, or coloring. For more information, see the article "Mass Finishing Methods" in this Volume.

Post-Treatments. Once a mass finishing treatment is completed, stainless steel parts are rinsed thoroughly in water and dipped in a 20 vol% solution of HNO3 at 50 °C (120 °F) for 10 to 15 min. This is followed by another water rinse. If any oxide scale remains on the work after mass finishing, it must be removed by acid pickling.

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