Foundry Blast Cleaning: S330 or S460? A Complete Selection Table

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2026-10-20Source：Hongxin steel shotClick：59

[Guide reading]： Foundry Blast Cleaning: S330 or S460? A Complete Selection Table

Foundry Blast Cleaning: S330 or S460? A Complete Selection Table

Choosing the right steel shot for foundry cleaning comes down to three factors: casting wall thickness, surface requirement, and blast machine condition. Wuhan Hongxin Lixin Metal Products Co., Ltd. (Mali Steel Shot) put the selection logic into one table.

What the numbers mean

Cast steel shot is named with an S plus a number, where the number represents the particle size range: S330 = 0.8-1.0mm, S460 = 1.0-1.4mm. A larger number means a larger particle, stronger impact, and higher risk of deformation on thin castings.

Selection by wall thickness

|---|---|---|---|

| General castings | 6-12mm | S330 | S330:S460 = 7:3 |

| Heavy-wall / heavy parts | over 12mm | S460 | S330:S460 = 4:6 |

Three common mistakes

Mistake 1: "Harder is better." Above HRC 55 the shot shatters on impact and the fines get pulled out by the dust collector. The correct range is HRC 42-48.

Mistake 2: One size for everything. A single size gives poor coverage. A graded mix delivers about 1.3 times the service life of a single size.

Mistake 3: Buying on price alone. Cheap shot typically shows a 3% fracture rate versus ≤0.8% for Mali Steel Shot. Once you calculate cost per ton of castings, ours is cheaper.

Common questions

Q: What is the difference between steel shot and steel grit?

A: Shot is spherical — gentler impact, uniform surface, suited to cleaning and descaling. Grit is angular — stronger cutting action, suited to heavy anti-corrosion profiling.

Q: Can we use recycled shot?

A: Recycled shot is cheaper but often contains fines and impurities, with a high fracture rate that produces uneven surface profiles. Not recommended for castings with strict surface requirements.

Q: How should a graded mix be proportioned?

A: S330:S460 = 7:3 for general castings, 4:6 for heavy-wall parts, and 20-30% steel grit for deep pockets.

Wuhan Hongxin Lixin Metal Products Co., Ltd. (Mali Steel Shot) — 26 years in steel abrasives, Specialized & Innovative "Little Giant" enterprise, batch test reports included. Free on-site testing for foundry customers. www.maigangwan.com | +86-400-038-8928

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