Steel shot VS steel grit: differences, hardness, application

I. Appearance

 Steel Shot: Spherical particles. Impact is achieved through hammering and compression, creating smooth pits on the metal surface; primarily used for cleaning and shot peening.

 Steel Grit: Sharp, angular particles. Sharp edges create a cutting and scraping effect, removing rust and old coatings, resulting in a sharp, anchoring roughness.

II. Hardness 40-68 HRC (Three grades)

- Steel Shot: 40-51 HRC is the most commonly used, with good toughness, not easily broken, and a long cycle life; higher hardness is commonly used for shot peening.

- Steel Grit:

- GP: Tough type (general rust removal)

- GL: Medium hardness, for removing oxide scale

- GH: High hardness, for treating hard and stubborn deposits

III. Application Scenarios

- Steel Shot: Thin coatings, shot peening; steel plate pretreatment, automotive parts, construction machinery shot peening; light rust removal and oxide scale removal from castings; smoothing of anchor patterns after rust removal.

- Steel grit: Removes heavy rust, thick oxide scale, and old paint layers, and improves the adhesion of heavy-duty anti-corrosion paint.