High-carbon cast steel grit in GP, GL, and GH hardness classes for rust removal, mill scale removal, coating preparation, surface profiling, and other demanding abrasive blasting applications.
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Available models
Supply and reference pricing remain subject to confirmation in the final quotation.
Product model, supply and order information
Model
Supply
Minimum order
Packaging
GP12
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GP14
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GP16
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GP18
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GP25
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GP40
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GP50
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GP80
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GH12
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GH14
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GH16
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GH18
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Product detail
Technical and purchasing information
Cast steel grit is an angular metallic abrasive made from high-carbon cast steel particles that are heat treated, crushed, screened, and classified into controlled size and hardness ranges. Unlike nearly spherical steel shot, steel grit has sharp, irregular edges that cut and scrape the workpiece surface more aggressively.
That makes steel grit a good fit for removing rust, mill scale, old coatings, and other tightly bonded surface contamination. It is also widely used when blasting needs to create a defined surface profile before painting, coating, bonding, or other finishing steps.
YUXIN manufactures cast steel grit in GP, GL, and GH hardness classes and supplies standard grit sizes from G12 to G120. Size and hardness can also be adjusted according to the agreed technical specification for a specific order.
Key Product Features
Angular metallic abrasive with strong cutting action
Available in GP, GL, and GH hardness classes
Standard supply range: G12–G120
Carbon content: 0.85–1.20%
Density: >7.40 g/cm³
Tempered martensitic microstructure
Controlled crushing and screening for consistent particle classification
Suitable for recyclable blast-cleaning systems
Size and hardness customization available according to order requirements
Technical Data
Item
GP Steel Grit
GH25
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GH40
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GH50
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GH80
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GH120
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GL12
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GL14
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GL16
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GL18
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GL25
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GL40
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GL50
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GL80
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GL Steel Grit
GH Steel Grit
Carbon (C)
0.85–1.20%
0.85–1.20%
0.85–1.20%
Silicon (Si)
0.40–1.20%
0.40–1.20%
0.40–1.20%
Manganese (Mn)
0.60–1.20%
0.60–1.20%
0.60–1.20%
Sulfur (S)
≤0.05%
≤0.05%
≤0.05%
Phosphorus (P)
≤0.05%
≤0.05%
≤0.05%
Hardness
42–50 HRC
56–60 HRC
63–66 HRC
Hardness Deviation
Maximum deviation ±3 HRC
Maximum deviation ±3 HRC
Maximum deviation ±3 HRC
Microstructure
Tempered martensite
Tempered martensite
Tempered martensite
Density
>7.40 g/cm³
>7.40 g/cm³
>7.40 g/cm³
The values above reproduce the latest technical index supplied for this product page. Final acceptance criteria for a specific order should follow the agreed specification, applicable standard, and batch inspection records.
GP, GL, and GH: What Is the Difference?
GP Steel Grit — 42–50 HRC
GP steel grit is the lowest-hardness grade in the YUXIN cast steel grit range. Its greater ductility allows the particles to wear and gradually become more rounded during repeated circulation.
GP is suitable where stable cleaning action, reusable abrasive life, and a less aggressive cutting effect are important. It can be used for general blast cleaning, scale removal, and surface preparation in recyclable blasting systems.
GL Steel Grit — 56–60 HRC
GL steel grit provides higher hardness and stronger cutting action than GP. Its angular shape is retained for longer during use, helping maintain a more pronounced cleaning and profiling effect.
GL is suitable for demanding rust and scale removal, coating preparation, and applications where a stronger and more consistent surface profile is required.
GH Steel Grit — 63–66 HRC
GH steel grit is the highest-hardness grade in this product range. Its high hardness helps preserve angular cutting edges during blasting, producing an aggressive etching and profiling action.
GH is particularly relevant to compressed-air blasting and other processes where cutting performance and surface texture are prioritized. It can also be used for specialized applications such as roll treatment in cold-rolling operations when the process specification requires a pronounced and controlled surface texture.
Because high hardness also affects particle fracture and wear behavior, GH should be matched carefully to the blasting system, workpiece, and required surface finish.
Typical Applications
Rust and Mill Scale Removal
Steel grit is suitable for removing rust and tightly adhered mill scale from:
Steel plate
Structural steel
Steel pipe
Forgings
Heat-treated components
Fabricated steel assemblies
Its angular particles provide a stronger cutting action than spherical steel shot.
Surface Preparation Before Painting and Coating
For steel structures, shipbuilding components, tanks, fabricated equipment, and other coated steel products, steel grit can remove surface contamination while creating the surface profile needed for subsequent coating systems.
The final profile depends on grit size, hardness, blasting velocity, angle of impact, equipment type, and the initial condition of the steel.
Shipbuilding and Marine Steel
Steel grit is commonly applied to ship plate, hull sections, deck structures, and other carbon-steel components before protective coating.
GP, GL, or GH selection depends on the required cleaning action, surface profile, and blasting equipment.
Steel Plate and Pipe Processing
Steel grit can be used for descaling, rust removal, and preparation of steel plate and pipe before coating or fabrication.
A controlled operating mix helps maintain consistent cleaning and surface texture during continuous production.
Fabricated Steel and Heavy Equipment
Structural fabrications, construction machinery, containers, and heavy equipment components often require removal of oxidation, process contamination, or previous coatings before further finishing.
Roll Treatment and Specialized Etching
High-hardness GH steel grit is suitable for applications where persistent angular cutting action is required, including certain roll-texturing and etching processes using compressed-air blasting equipment.
How Grit Size Affects Blasting Performance
Steel grit size influences both individual particle impact and the number of particles contacting the surface.
Coarser grit carries more mass per particle and generally produces stronger cutting action and a more pronounced surface profile.
Medium grit provides a balance between cleaning action, impact energy, and coverage.
Finer grit produces a greater number of impacts per unit area and can create a finer, more uniform surface texture.
The appropriate grade depends on workpiece thickness, initial surface condition, coating system, equipment energy, and target surface profile.
Available Sizes
YUXIN's standard steel grit supply range covers G12 to G120.
Standard grades currently used within this range include:
G12, G14, G16, G18, G25, G40, G50, G80, and G120.
Manufacturing Process
YUXIN cast steel grit is produced through a controlled route that begins with steelmaking and particle formation and then adds crushing to create angular abrasive particles.
A typical production route is:
Raw material preparation → medium-frequency induction melting → centrifugal atomization → drying → coarse screening → shape selection → size screening → secondary quenching when required → crushing → post-crushing screening → tempering → final screening → packaging
Important production stages include:
Centrifugal atomization, which creates the initial cast steel particles.
Heat treatment, which adjusts hardness and metallurgical condition.
Controlled crushing, which creates the angular geometry required for cutting action.
Screening and classification, which separate particles into defined grit-size ranges.
Tempering, which helps balance hardness, toughness, and service stability.
The heat-treatment route can be adjusted according to the required GP, GL, or GH hardness class and the agreed technical specification.
Standards and Specification Framework
ISO 11124-3:2018 specifies requirements for high-carbon cast-steel shot and grit supplied for blast-cleaning, including hardness, density, defect/structural requirements, and chemical composition.
SAE J1993_201902 describes chemical composition and physical-characteristic requirements for high-carbon cast-steel grit used in blast-cleaning and etching operations.
SAE J444_202306 provides standardized cast shot and grit size designations for cleaning and peening applications.
Product conformity for a specific order should be established through the agreed technical specification, applicable standard, and corresponding inspection records.
Selection Considerations
Choosing steel grit involves more than selecting a G number. Important variables include:
Required surface cleanliness
Required surface profile
Rust, scale, or coating condition
Workpiece material and thickness
Wheel-blast or compressed-air equipment
Blasting velocity and angle
Grit hardness
Operating-mix condition
Abrasive recovery and separation efficiency
GP, GL, and GH should therefore not be treated as interchangeable grades. Their different hardness levels produce different cutting, wear, and profiling behavior during service.
Reference List
International Organization for Standardization. (2018). Preparation of steel substrates before application of paints and related products—Specifications for metallic blast-cleaning abrasives—Part 3: High-carbon cast-steel shot and grit (ISO Standard No. 11124-3:2018). https://www.iso.org/standard/66706.html