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Effect of shot blasting on processoxidised stainless steel – morphology,chemistry and pickling performance
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The oxide scale created during manufacturing of stainless steel is often removed by a chemical pickling with mixed acid. Various pre-treatments to pickling are also applied to increase the efficiency of the oxide scale removal. Shot blasting is one such pre-treatment, which operates to remove a certain amount of oxide and also to generate cracks and openings for the subsequent pickling. In this work, three materials, AISI 2205, 430 and 304 have been blasted and later exposed to mixed acid. This was conducted to quantify the effect shot blasting has on the subsequent pickling of stainless steel. Three shot products and two blasting parameters were investigated and varied. Shot blasting significantly reduced the oxide scale but was unable to remove the chromium oxide layer closest to the steel surface. No significant difference was observed when comparing the result from the three shot products after blasting. Increasing the particle velocity or the coverage rate further enhanced the pickling but reduced the amount of oxide removed during blasting. These effects are however relative small, so in practise relatively mild conditions seems preferable for economic reasons. Oxide scale containing hematite was difficult to remove by both shot blasting and pickling. 

Place, publisher, year, edition, pages
2014. , 54 p.
Keyword [en]
Stainless steel, oxide, pickling, shotblasting
National Category
Engineering and Technology Other Materials Engineering
URN: urn:nbn:se:kth:diva-161877OAI: diva2:795762
Subject / course
Physical Metallurgy
Educational program
Master of Science - Engineering Mechanics
Available from: 2015-03-17 Created: 2015-03-17 Last updated: 2015-03-17Bibliographically approved

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