Advantages of Adding G25 Cast Steel Grit During Shot Blasting Process
1. Boost Casting Descaling & Sand Cleaning Efficiency
cast steel grit G25 has sharp angular edges with superior cutting performance. Unlike round steel shot that only relies on impact force, angular G25 effectively scrapes off burnt bonded foundry sand, heavy oxide scale and stubborn sand crust on casting surfaces. Supplementing G25 mid-production quickly restores the abrasive's cutting power and prevents cleaning efficiency drop caused by worn, rounded old abrasives.
Featuring medium particle size between coarse G16/G18 grit and fine G40 grit, G25 fills gaps among existing steel shot blends. Mixed abrasives with varied particle sizes generate matched impact energy to thoroughly remove residual sand from casting grooves, inner cavities and dead corners, shortening blasting time by 20%–35%.
2. Accurately Control Surface Roughness for Coating & NDT Requirements
Stabilize anchor profile depth: Workpieces blasted solely by steel shot end up with overly smooth surfaces leading to poor paint adhesion, while oversize coarse grit creates excessive uneven roughness. Intermediate G25 maintains consistent roughness at Ra 25–65 μm, significantly improving adhesion of spray paint and electrophoretic coatings and preventing coating peeling.
Combine surface strengthening and surface texturing: Steel shot achieves surface work hardening and releases surface tensile stress; G25 forms uniform micro-indentations on casting surfaces. Such textured finish exposes hidden cracks and pinholes clearly during magnetic particle inspection (MPI) and penetrant testing (PT), lowering missed defect rates in non-destructive testing.
3. Cut Abrasive Consumption & Production Costs
Slow down overall abrasive dulling: Existing steel shot turns round and blunt after repeated blasting. Mixing fresh sharp G25 keeps the entire abrasive batch in stable cutting condition without full abrasive replacement, saving raw material procurement expenses.
High toughness & low fragmentation: Heat-treated high-carbon G25 resists pulverization and can be recycled over 2000 blasting cycles. Reduced dust output eases dust collector load, cuts filter replacement cost and avoids rework from dust recontamination on finished castings.
4. Universal Compatibility for Diverse Iron & Steel Castings
Ideal for both thick heavy castings and thin-wall castings: Coarse G18 grit tends to dent thin cast components, while fine G40 lacks enough cutting force for thick oxide removal. As a versatile medium-grade abrasive, G25 handles heavy-duty descaling for large castings and mild surface finishing for thin parts, eliminating frequent abrasive formula changeovers.
Remove micro burrs efficiently: Medium-sized angular grit trims gate remnants and parting-line flash, reducing extra manual grinding procedures.
5. Reduce Wear & Tear on Blasting Equipment
G25 causes less abrasion on blast wheel blades and wear liners than oversized G10/G12 coarse grit; compared with fine G50/G80 grit, it rarely clogs separator screens, extending spare part service life and minimizing production downtime for machine maintenance.
Recommended Blending Ratio
For regular shot blasting dominated by steel shot: Add G25 at 10%~15% of total abrasive weight per refill to sustain stable long-term blasting quality.
