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GP
72051000
SEPPE Steel Grit GP is an economical general-purpose cast steel grit with high toughness, low breakage rate and stable angular cutting performance. It is produced through controlled quenching, tempering, crushing and screening, and is widely used for foundry cleaning, steel plate pre-treatment, light-to-medium rust removal and high-volume blasting operations where abrasive life and cost control are important.
Product: GP grade cast steel grit for shot blasting and surface preparation
Other Names: GP Steel Grit, Cast Steel Grit GP, Angular Steel Abrasive
Standard Reference: SAE J199 / common G series steel grit size grades
HS Code: 72051000
Manufacturer of Material: SEPPE TECHNOLOGIES
▸ GP steel grit is the toughest and most economical grade among common GP, GL and GH cast steel grit.
▸ During blasting, its angular edges gradually wear into a more rounded shape instead of breaking quickly, helping reduce dust, abrasive consumption and equipment blockage.
▸ GP is suitable when the workpiece needs controlled cleaning rather than extremely aggressive cutting, especially for foundry parts, thin plates and regular production-line blasting.
▸ High Toughness: Lower breakage tendency helps extend abrasive recycling life and reduce fine powder.
▸ Controlled Cutting: Angular particles clean oxide scale and rust while reducing excessive substrate damage on thinner workpieces.
▸ Equipment Friendly: Stable particle structure helps reduce clogging in elevators, separators and recycling systems.
▸ Economical Operation: A practical choice for high-volume blasting where abrasive cost and production stability matter.
 | Foundry Cleaning ▸ Used for sand removal and oxide scale cleaning on cast steel and cast iron components. ▸ GP grade provides controlled angular cutting while keeping good toughness and low breakage. ▸ Suitable for economical foundry cleaning where stable recycling life and cost control matter. |
 | Steel Plate Pre-Treatment ▸ Used for light rust and thin oxide removal on hot-rolled sheets, section steel and H-beams. ▸ Angular particles create a cleaner profile than round shot while avoiding excessive cutting. ▸ A practical choice for production-line blasting when the surface does not require very deep roughness. |
 | Automotive Parts ▸ Used for chassis components, stamped parts and thin-wall metal parts before coating or assembly. ▸ GP steel grit offers gentler angular cleaning for workpieces that need controlled surface impact. ▸ Suitable for high-volume parts cleaning where low fine powder and stable machine operation are important. |
 | Light Steel & Hardware ▸ Used for light steel frames, iron art, thin-wall pipes and general metal workpieces. ▸ Controlled cutting removes rust and light scale without overly aggressive substrate damage. ▸ Recommended when customers need an economical grit for regular hardware and light fabrication work. |
| Coarse GP Grades | GP10-GP18 | Heavy casting cleaning and stronger oxide removal |
| Mainstream GP Grades | GP25-GP40 | General surface preparation and production-line blasting |
| Fine GP Grades | GP50-GP80 / GP120 | Thin plates, precision workpieces and fine pre-finishing |
▸ GP is the tough and economical grade for controlled cleaning, lower breakage and high-volume recycling systems.
▸ Steel grit works mainly by angular cutting. Compared with steel shot, it creates a clearer anchor profile and removes rust or coating more aggressively.
▸ Final selection should consider workpiece thickness, rust level, coating requirement, blasting machine type and target surface roughness.
▸ Scrap steel management - induction furnace melting - centrifugal atomization - drying - screening - quenching - spiral separation - grit crushing - tempering - final screening - packaging.
Raw material management 
Induction furnace operation 
Quenching line 
Screening & packaging line
▸ Intermediate stock is separated before final screening and packaging, helping keep different batches, sizes and processing stages traceable.
▸ For GP steel grit, toughness, particle stability and low fine powder generation are important for economical blasting operation.
▸ COA, sieve analysis, hardness report, retained sample and loading photos can be arranged according to order requirements.
| Main Size | G16, G18, G25, G40, G50, G80 and customized grades |
| Chemical Composition | C: 0.8-1.2%; Si: >=0.4%; Mn: 0.35-1.2%; S/P: <=0.05% |
| Hardness | HRC 42-52 typical |
| Density | >=7.6 g/cm3 |
| Package | 25 kg bags, 1000 kg jumbo bags, pallet package or customized export packing |
▸ Steel grit is listed in the SEPPE metal abrasives catalog under SAE J444 / GB/T 18838 reference systems, with GP, GL and GH hardness grades for different cutting strength and toughness requirements.
▸ Typical steel grit production route: scrap steel management - induction furnace melting - centrifugal atomization - drying - screening - quenching - spiral separation - grit crushing - tempering - final screening - packaging.
▸ Steel grit screen analysis includes common G series grades such as G10, G12, G14, G16, G18, G25, G40, G50, G80 and G120. Coarse grit is used for stronger rust removal and deeper profile; fine grit is used for smaller workpieces and finer surface control.
▸ In-house QC items include chemical composition, hardness, density, microstructure and durability. Testing equipment includes Ervin fatigue life tester, SPECTRO optical emission spectrometer, metallographic microscope, Vickers microhardness tester and carbon-sulfur analyzer.
▸ SGS pre-shipment inspection, MSDS, COA, sieve analysis and retained sample support can be arranged when required.
▸ GP Steel Grit is normally supplied in 25 kg PE/PP woven bags, 1000 kg FIBC jumbo bags, palletized bags, steel drums on request or customized export packaging. Bag marks can show the steel grit grade and size, such as GP / G40 / GL50, according to purchase requirements.
▸ Standard pallet packing is commonly 40 bags per pallet, about 1 MT per pallet. Typical 20'GP loading quantity is about 25-27 MT for steel shot or steel grit.
▸ Stock items are usually prepared within 7-15 days. Customized production or private-label packing may require about 20-30 days. Keep steel grit packages dry before use; batch labels and loading photos can be provided for traceability.
▸ GP is suitable for economical foundry cleaning, steel plate pre-treatment, thin plate blasting and general-purpose surface preparation.
▸ GP has lower hardness and higher toughness, GL is the balanced middle grade, and GH has the highest hardness for stronger cutting and deep anchor profile.
▸ Yes. GP cuts more gently than GL and GH, but it usually has better toughness and lower breakage.
▸ Foundry parts, light steel, thin plates, hardware and general workpieces that need controlled cleaning are suitable.
▸ In many recycling blasting systems, GP can be economical because of its toughness and lower breakage tendency.
Contact SEPPE for steel grit size selection, hardness grade, surface profile requirement, COA, samples, packaging and bulk order support.
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