Steel abrasive
Properties
Most steel abrasives are made of a high-carbon steel composition, the best compromise between mechanical properties, efficiency and durability. The most important properties for steel abrasives are hardness, grain size and shape, toughness and cleanliness (lack of oxides, contaminants, etc.).
Recyclability and environmental impact
The recyclability of steel shot and grit ranges between 2000 to 3000 cycles. Due to its high recyclability level, steel shot and grit tend to generate less waste when compared to other expendable abrasives.
Hardness
Steel shot or grit is usually available at different hardness levels, ranging between 40 and 65 on the Rockwell scale (400 to 850 on the Vickers hardness scale).
Industrial applications
Cleaning
Steel shot and grit are used in cleaning applications for removal of loose material on metal surfaces. This type of cleaning is common in automotive industry (motor blocks, cylinder heads, etc.).
Surface preparation
Surface preparation is as a series of operations including cleaning and physical modification of a surface. Steel shot and grit are used in surface preparation process for cleaning metal surfaces which are covered with mill scale, dirt, rust, or paint coatings and for physically modifying the metal surface such as creating roughness for better application of paint and coating.
Stone cutting
Steel grit is used in cutting hard stones, such as granite. The grit is used in large multi-blade frames which cut the blocks of granite into thin slices.
Shot peening
Shot peening is the repeated striking of a metal surface by hard shot particles. These multiple impacts produce a deformation on the metal surface but also improve the durability of the metal part. The media used in this application is spherical rather than angular. The reason is that spherical shots are more resistant to the fracture which happens due to the striking impact.
Industrial uses
Steel shot and grit address numerous sectors since cleaning, surface preparation or shot peening applications are used by many industries as a part of their construction, renovation or repair processes. The main industrial sectors employing steel abrasives are:
Automotive industry
Construction
Metallurgy
Petrochemical industry
Production
The annual steel abrasive production in the world is estimated to be above 1 million tonnes, the world largest producer being Wheelabrator Allevard by production and capacity.
See also
Abrasive
Abrasive blasting
Abrasive machining
References
^ Olson, Donald,T. (2003). Abrasives, Manufactured. U.S. Geological Survey Minerals Yearbook.
^ Momber, A. (2008). Blast Cleaning Technology. Springer-Verlag Berlin Heidelberg.
^ Olson, Donald,T. (2003). Abrasives, Manufactured. U.S. Geological Survey Minerals Yearbook.
^ Engineering and Design – Thermal Spraying: New Construction and Maintenance. HQ Publications. 1999.
^ Briggs, J. (2007). The Abrasives Industry in Europe and North America. Materials Technology Publications. ISBN 1-871677-52-1.
Montani, C.; 2009, Stone 2009, World Marketing Handbook, Faenza Editrice, ISBN 978-88-8138-124-1
Schulze, V.; 2006, Modern Mechanical Surface Treatment, Wiley-VCH, Verlag GmbH & Co. KGaA, Weinheim, ISBN 3-527-31371-0
External links
Abrasives Used for Blasting Operations
Industrial Applications of Steel Abrasives
Standard Specification for Steel Abrasives
Properties of Metal Abrasives
Portal of Shot Peening
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