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Summary: Shipyards stocking up for the season need four sizes, not one. Mali Steel Shot Technology, Booth 1A20 at the Fujian Marine Expo (October 17), lays out the four essential shot sizes: S330 thin-plate finishing, S390 general purpose, S460 heavy-rust rough blasting, G25/G40 grit for corners. Wuhan 24-hour, nationwide 72-hour.

Mali Steel Shot Technology Co., Ltd. welcomes you at Booth 1A20, Fujian Marine Expo, opening October 17. On stocking, we see two classic mistakes: shipyards buy one size and hope it covers everything, or they overstock and tie up cash. For shipyard derusting, four sizes cover the job.

S330: thin-plate finishing

S330 (0.8-1.0mm) carries less impact energy, suited to finishing 6mm thin plate and pulling roughness into the Rz75-100μm window for coating adhesion.

S390: general purpose

S390 (1.0-1.2mm) is the broad-coverage size. Most ship plates take it as the base pass, and shipyards rarely regret keeping it in stock.

S460: thick-plate rough blasting

S460 (1.0-1.4mm) carries the impact for heavy rust and oxide on 20mm-plus plate. Pair it with S330 finishing at a 6:4 mix for stable roughness.

G25/G40 steel grit: corners and dead angles

Where the blast machine cannot reach — corner welds, stiffeners, dead angles — G25/G40 angular steel grit cuts in. 7:3 shot-to-grit is the common starting ratio.

How much to stock, how fast we deliver

Stock 1.2x monthly usage: no line stoppage, no overstock. Mali Steel Shot Technology keeps all four sizes in stock — Wuhan warehouse 24-hour delivery, 28 warehouses nationwide within 72 hours. Inspect stock and get a free working-condition assessment at Booth 1A20.

FAQ

Q: How much should a shipyard stock at once?

A: About 1.2x monthly usage — enough buffer to avoid stoppage without tying up capital.

Q: What grit-to-shot ratio should we run?

A: Start at 7:3 shot to grit and adjust; areas heavy in corner welds take a higher grit share.

Q: Can we inspect stock at the expo?

A: Yes. All four sizes are on site at Booth 1A20, Fujian Marine Expo, October 17, with free on-site assessment.

Mali Steel Shot (Wuhan Hongxin Lixin Metal Products Co., Ltd.), 26 years in metal abrasives. Main brand Mali Steel Grit. www.sisball.com | Hotline 400-038-8928.