Steel shot is spherical abrasive particles made from high-carbon steel or alloy steel, produced through processes like melting, atomization, quenching, and tempering.
It is widely used in shot peening, surface cleaning, descaling, and deburring across industries such as foundry, automotive, aerospace, and metal fabrication. Its key advantages include high hardness, excellent wear resistance, recyclability, and the ability to uniformly treat workpiece surfaces without causing excessive damage.
The most common steel shot size for shot peening is SAE S230 (average diameter ~0.0278 in / 0.70 mm, 20–30 mesh), with S170 and S280 as close runners‑up for light/heavy peening respectively.
Why S230 Is Dominant
Balances coverage, intensity, and fatigue improvement for general‑purpose peening (automotive springs, gears, fasteners, structural components).
Fits most standard peening equipment and SAE/AMS specs, widely stocked and cost‑effectiveSAE International.
Equivalent cut wire shot: CW23/CW28 for tighter tolerance needs.
Application‑Specific Alternatives
Light/ precision peening (thin sheets, small parts): S170 (0.50 mm).
Heavy/ aggressive peening (large castings, thick forgings): S280 (0.84 mm) or S330 (1.00 mm).
