This guide is written for process engineers, equipment managers, and procurement teams in foundries, heat treatment plants, automotive and specialty vehicle frame manufacturing, coal mine hydraulic support production, steel structure fabrication, and powder coating (painting) line operations. It covers the full lifecycle of the monorail continuous pass-through shot blasting machine (悬链连续通过式抛丸机) — from selection and installation to daily maintenance and troubleshooting.
Data Note: Values marked “industry reference” are ranges from public sources and engineering experience, intended for preliminary evaluation. For formal procurement and process acceptance, the manufacturer’s technical documentation, mutually confirmed process test results, and current valid standards shall prevail.
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Table of Contents
- Equipment Overview & Model Differentiation
- Structural Composition & Working Principle
- Detailed Applications (Including Powder Coating / Painting Line Integration)
- Selection Methods & Parameter Determination
- Installation, Commissioning & Process Validation
- Maintenance During Operation
- Common Faults & Solutions
- Safety, Environmental Protection & Occupational Health
- Appendix: Quick Reference Tables
1. Equipment Overview & Model Differentiation
1.1 What Is a Monorail Continuous Pass-Through Shot Blasting Machine?
The monorail continuous pass-through shot blasting machine (also known as overhead monorail shot blasting machine, 悬链连续通过式抛丸机, or 悬链通过式抛丸机) combines the suspension conveying method of a hanger-type shot blasting machine with the continuous operation mode of a pass-through shot blasting machine.
Workpieces are hung on fixtures suspended from an overhead monorail chain. The chain carries them continuously or intermittently through a shot blasting chamber, where multiple high-speed rotating blast wheels project abrasive media onto the workpiece surface from different spatial angles — completing sand removal, rust removal, descaling, and surface texturing in a single pass.
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Core Value — Three Key Advantages:
- Continuous High-Volume Processing: Workpieces circulate on the chain; loading/unloading and blasting can be independently partitioned. Stable cycle times make it ideal for large-scale production.
- Omnidirectional Coverage: Workpieces rotate or oscillate while suspended; combined with multi-angle blast wheel arrangement, this handles bottom surfaces, internal cavities, and complex contours that roller conveyor machines cannot reach.
- Direct Line Integration: The overhead conveying system is naturally suited for sharing the same suspension chain with powder coating and painting lines, achieving integrated “shot blasting → blow-off → spraying → curing” flow.
1.2 Differences from Adjacent Models (Clarify Before Selection)
Choosing between a monorail conveyor shot blasting machine and other types is the first decision in any surface-preparation project. The table below compares the overhead monorail shot blaster with the roller conveyor shot blasting machine, the mesh belt pass-through shot blasting machine, the crawler belt shot blasting machine, the single-hook shot blasting machine, the double-hook shot blasting machine, and the rotary table shot blasting machine:
| Model | Conveying Method | Applicable Workpieces | Features |
|---|---|---|---|
| Roller conveyor shot blasting machine | Horizontal rollers | Steel plates, H-beams, channels, pipes (long profiles) | High efficiency, shallow pit, but limited bottom and internal cavity coverage |
| Mesh belt pass-through shot blasting machine / crawler belt shot blasting machine | Mesh belt or crawler | Thin-walled parts, die castings, small parts in batches | Not suitable for large hanging parts or impact-sensitive parts |
| Single-hook shot blasting machine / double-hook shot blasting machine | Hook enters/exits chamber | Small-to-medium batches, multi-variety castings and forgings | High flexibility, but cycle time limited by loading/unloading |
| Monorail continuous pass-through shot blasting machine | Overhead monorail continuous/step/indexing | High-volume hangable parts, frames, supports, structural components | Continuous cycle, can integrate with coating lines; relatively higher investment and footprint |
| Rotary table shot blasting machine | Rotary table | Gears, disc parts for strengthening | High positioning accuracy, limited capacity |
Why this comparison matters: A roller conveyor shot blasting machine is often chosen for long profiles, while a hanger type shot blasting machine suits job-shop flexibility. But when the goal is continuous shot blasting for high-volume production with painting line integration, the overhead monorail conveyor shot blasting machine is usually the only model that satisfies all three requirements at once.
1.3 Common Monorail Model Series Classification
Domestic monorail cleaning equipment is typically divided into three categories by conveyor chain operation mode (model prefixes vary by manufacturer; procurement should be based on operation mode rather than model number). All three are variants of the monorail conveyor shot blasting machine:
| Operation Mode | Typical Series | Operating Characteristics | Application Scenarios |
|---|---|---|---|
| Continuous monorail shot blasting machine | Q38 series, etc. | Monorail runs at constant speed without interruption; workpieces pass continuously through blasting chamber | Single product variety, extremely large batches, high cycle time requirements |
| Step-type monorail shot blasting machine | Q48 series, etc. | Intermittent advance at set step intervals; can stop at loading/unloading and blasting zones separately | Fixed-point loading/unloading, fixed-point blasting; heavy or complex-shaped workpieces |
| Indexing monorail shot blasting machine | Q58 series, etc. | Push chain and load-bearing chain separated; fixtures can accumulate and stop at designated zones | Buffering between processes, decoupling from coating line cycle times |
Selection Tip: If the shot blasting process shares a monorail with a downstream coating line and the two processes have different cycle times, the indexing monorail shot blasting machine is almost mandatory — it allows workpieces to accumulate at the blasting chamber exit and wait, preventing the entire line from being dragged to a stop.
1.4 How This Machine Compares with German Wheelabrator, US Pangborn, and Japanese Sintokogio (New East)
When buyers evaluate a monorail continuous pass-through shot blasting machine, three international names almost always appear on the shortlist: German Wheelabrator, US Pangborn, and Japanese Sintokogio (New East). All three are well-established brands with strong reputations in overhead monorail shot blasting and shot blasting and painting line integration.
For most buyers, however, the decisive factor is not brand prestige but total cost of ownership at equal cleaning performance. On comparable specifications — similar blast wheel power, similar hanger load, similar achievable cleanliness grade (Sa2.5) — a Chinese monorail shot blasting machine is typically available at roughly one-third of the price of equipment from German Wheelabrator, US Pangborn, or Japanese Sintokogio (New East), while delivering equivalent cleaning quality on the same workpiece types.
| Comparison Item | German Wheelabrator | US Pangborn | Japanese Sintokogio (New East) | Monorail Conveyor Shot Blasting Machine |
|---|---|---|---|---|
| Cleaning quality (Sa2.5 achievable) | Yes | Yes | Yes | Yes |
| Blast wheel power class | Comparable | Comparable | Comparable | Comparable |
| Hanger load class | Comparable | Comparable | Comparable | Comparable |
| Relative price level | Baseline | Baseline | Baseline | ~1/3 of baseline |
| Spare parts cost | High | High | High | Significantly lower |
| Delivery lead time | Long | Long | Long | Shorter |
| Line integration flexibility | High | High | High | High |
What this means in practice: A buyer who needs continuous pre-coating surface preparation for truck chassis frames or structural steel can achieve the same Sa2.5 near-white blast cleaning result with a monorail conveyor shot blasting machine at about one-third of the investment required for German Wheelabrator, US Pangborn, or Japanese Sintokogio (New East) equipment. The savings can then be redirected into spare wear parts, additional blast wheels, or a larger supplementary blasting chamber — all of which directly improve long-term line availability.
Note on equivalence: “Equivalent quality” here refers to the achievable surface cleanliness grade, roughness range, and cleaning coverage on the same workpiece under the same abrasive and speed conditions. Buyers should always confirm equivalence through actual workpiece process validation (see Section 5), not through brochure claims alone — regardless of whether the machine carries the German Wheelabrator name, the US Pangborn name, the Japanese Sintokogio (New East) name, or any other brand.
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2. Structural Composition & Working Principle
Understanding the structure is the prerequisite for good selection and maintenance. A complete monorail conveyor shot blasting machine typically consists of six subsystems.
2.1 Monorail Conveying System
- Load-bearing rail and traction chain: Overhead dual-rail (or single-rail) structure; load-bearing rail carries fixtures and workpiece weight, traction chain provides power.
- Drive unit: Variable-frequency speed control for stepless adjustment of conveying speed.
- Tensioning device: Counterweight or spring tensioning to absorb chain thermal elongation and wear elongation.
- Fixtures and rotation mechanism: Hooks, hanging beams; some models feature planetary rotation (rotation + revolution simultaneously) to ensure uniform abrasive coverage on all surfaces, avoiding “shadow” effects.
- Turning and climbing sections: Determine factory layout and chain length.
2.2 Blasting Chamber & Blast Wheels
Chamber: Steel plate welded structure with high-chromium wear-resistant liners (or manganese steel liners) on inner walls; liners are replaceable sacrificial components.
Blast wheels: Cantilever centrifugal blast wheels are mainstream, consisting of motor, impeller, abrasive distributor, directional sleeve, blades, and liners. The number, power, installation angle, and spatial position of blast wheels determine cleaning coverage; reputable manufacturers determine arrangement through 3D dynamic projection simulation.
Sealing devices: Multi-layer rubber curtains or labyrinth seals at inlet/outlet to prevent abrasive escape.
2.3 Supplementary Blasting Chamber (Key Design for Extra-Large Workpieces)
For workpieces such as truck chassis frames and coal mine hydraulic supports with large dimensions, complex structures, internal cavities, and dead zones, fixed projection angles from the main blasting chamber alone cannot achieve full coverage. Therefore, adding a supplementary blasting chamber after the main blasting chamber is standard practice for these models.
Common supplementary chamber configurations:
- Manual supplementary blasting station: Operators use shot blasting guns to clean dead zones, internal cavities, and weld roots; flexible but dependent on operator skill; requires independent dust extraction and protection.
- Movable auxiliary blast wheels/guns: Rail-mounted or swing-arm type, semi-automatic compensation.
- Multi-angle auxiliary blast wheels: Directional blast wheels added for known dead zone orientations, achieving automatic supplementary blasting.
Selection Point: If workpieces have obvious dead zones, procurement must explicitly require a supplementary blasting chamber, and specify in the technical agreement the supplementary method, number of stations, dust extraction air volume, and lighting illuminance. Retrofit installation often involves chamber modification and dust extraction system expansion, costing far more than factory configuration.
2.4 Abrasive Circulation System
This is the “blood circulation system” of the overhead monorail shot blasting machine; its condition directly determines cleaning quality and abrasive cost:
- Abrasive falls into hoppers at the chamber bottom after impacting workpieces.
- Longitudinal screw conveyor collects abrasive to the transverse screw.
- Bucket elevator lifts abrasive to the abrasive-dust separator at the top of the machine.
- The separator separates qualified abrasive, broken abrasive, dust, and debris through air classification.
- Qualified abrasive enters the storage hopper and is quantitatively supplied to each blast wheel through abrasive supply gates (pneumatic or electric) for recycling.
Separator efficiency is a core indicator: Incomplete separation causes broken abrasive and dust to return to blast wheels, reducing cleaning efficiency and accelerating blade wear.
2.5 Dust Extraction System
Shot blasting generates large amounts of dust-laden gas. Mainstream configuration is two-stage dust extraction: cyclone dust collector for primary pre-separation, cartridge (or bag) filter for secondary fine filtration, with purified discharge meeting standards. Dust collector air volume, filter area, and filter media grade must match chamber volume and abrasive circulation rate — otherwise issues such as positive pressure in the chamber, dust escape, and poor visibility will occur.
2.6 Electrical Control System
PLC centralized control with touchscreen HMI, achieving monorail speed regulation, blast wheel start/stop sequence interlocking, abrasive supply adjustment, dust extraction and abrasive circulation linkage, fault alarms, and safety door interlocks. High-end configurations can include automatic abrasive replenishment, blast wheel current monitoring (inferring whether abrasive supply is sufficient through current), and remote maintenance interfaces.
2.7 Workflow Summary
Workpiece loading and hanging → Monorail conveys into chamber → Multi-angle blasting by blast wheels (main blasting chamber) → Dead zone supplementary blasting (supplementary chamber) → Residual abrasive blow-off → Abrasive recycled through screw + elevator + separator → Dust purified and discharged through dust extraction system → Workpiece exits line or directly enters coating process
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3. Detailed Applications
3.1 Casting Sand Removal
Surface cleaning of large batches of steel, iron, and aluminum castings after shakeout — removing adhered sand, residual cores, and burrs, exposing the metal surface, while providing a qualified surface foundation for subsequent magnetic particle inspection, machining, and coating.
For high-volume castings, a monorail conveyor shot blasting machine for castings offers higher throughput than a single-hook shot blasting machine or double-hook shot blasting machine, because loading, blasting, and unloading happen simultaneously at separate stations.
Note: If a large amount of molding sand remains on casting surfaces before cleaning, it will accelerate abrasive contamination and separator load; floating sand should be removed as much as possible during the shakeout process.
3.2 Heat Treatment Workpiece Descaling
Scale on workpieces after normalizing, quenching, tempering, and annealing is hard and firmly adhered. Shot blasting removal is more environmentally friendly than acid pickling and more efficient than manual grinding. Simultaneously, the plastic deformation from shot blasting can introduce residual compressive stress in the surface layer, positively affecting fatigue strength improvement.
For mixed batches of heat-treated parts, a step-type monorail shot blasting machine allows fixed-point loading and fixed-point blasting, which is more controllable than a crawler belt shot blasting machine when parts must not tumble against each other.
3.3 Frame, Chassis Structural Component Rust Removal & Refurbishment
Automotive frames, specialty vehicle chassis, and construction machinery structural components — long, box-beam, multi-weld workpieces — are among the most typical applications for the overhead monorail shot blasting machine:
- Remove rolled scale and rust generated during storage and transportation.
- Clean welding spatter, slag, and heat-affected zone oxidation colors.
- Eliminate some welding residual stress, improving fatigue life.
- Provide uniform rough anchor pattern surface for electrophoretic coating, powder coating, and painting.
Compared with a roller conveyor shot blasting machine, the monorail model reaches the bottom flange and inner webs of a box beam far more effectively, because the workpiece hangs free and can rotate.
3.4 Extra-Large Workpieces Such as Coal Mine Hydraulic Supports
Coal mine hydraulic supports (top beams, bases, shield beams, linkages) are heavy, large, and have multiple internal cavities, hinge holes, and shadowed dead zones formed by reinforcing ribs — representative workpieces requiring the “main blasting chamber + rear supplementary blasting chamber” combined process. Such applications have high requirements for single-hook load capacity, chamber cross-section dimensions, monorail load-bearing capacity, and supplementary blasting station configuration.
Similar workpieces include: Large construction machinery structural components, wind turbine hubs and bases, marine supporting components, pressure vessel heads, mining machinery components, etc.
For these parts, a heavy-duty monorail shot blasting machine with 1000 kg hanger load is often required — a capacity class that most rotary table shot blasting machines and hanger type shot blasting machines cannot match.
3.5 Integration with Powder Coating (Painting) Lines — The Most Valuable Application
The monorail continuous pass-through shot blasting machine can serve as the first process of an entire powder coating production line or painting line, sharing the same suspension conveyor chain with the coating equipment. This is often called shot blasting and painting line integration or a continuous pre-coating surface preparation line.
It performs two irreplaceable functions:
① Thorough Removal of Surface Contaminants
Remove rust, scale, old paint film, oil residue, and welding slag to achieve the cleanliness grade required for coating. The commonly used domestic standard is GB/T 8923.1 (equivalent to ISO 8501-1):
| Grade | Name | Surface Condition | Corresponding International/Industry Code |
|---|---|---|---|
| Sa1 | Light blast cleaning | Remove loose contaminants; firmly adhered scale and old paint allowed | SSPC-SP7 |
| Sa2 | Thorough blast cleaning | Scale and rust basically removed; slight shadows allowed; defect area ≤33% | SSPC-SP6 |
| Sa2.5 | Very thorough blast cleaning (near-white) | No visible oil, scale, rust, coating, or foreign matter; only point or stripe slight discoloration allowed; residual area ≤5%; uniform gray-white | SSPC-SP10/NACE No.2 |
| Sa3 | Blast cleaning to bare steel | Completely expose metal surface; no residue | SSPC-SP5 |
The most commonly used acceptance grade for heavy-duty anti-corrosion coating and powder coating is Sa2.5.
② Formation of Uniform Surface Roughness (Anchor Pattern)
Shot blasting creates microscopic peaks and valleys on the metal surface, i.e., “anchor pattern.” Its functions are:
- Mechanical interlocking: Paint penetrates into anchor pattern valleys and cures, forming mechanical interlocking that greatly improves adhesion.
- Increased effective surface area: Actual contact area per unit area increases, enhancing molecular forces.
- Reduced sagging and shrinkage: Moderately rough surfaces help paint spread evenly.
Roughness is not “the greater the better.” Excessively deep anchor patterns cause insufficient paint coverage at peaks, resulting in “peak whitening” and early pitting; excessively shallow anchor patterns result in insufficient adhesion. Industry reference ranges:
| Application Scenario | Roughness Reference Range |
|---|---|
| General industrial coating | 45–75 μm |
| Anti-corrosion coating process | 50–70 μm |
| Epoxy coatings | 30–75 μm |
| Rubber lining substrate | Ra 25–60 μm (commonly ~40 μm) |
Key Principle: Roughness must be less than about 1/3 of the coating dry film thickness, otherwise peaks may be penetrated. After selecting the powder coating or paint system, obtain the recommended roughness from the coating supplier and work backward to determine abrasive particle size.
③ Process Benefits of Line Integration
Directly entering the powder coating/painting process after shot blasting avoids flash rust during “shot blasting → transfer → placement → spraying.” Steel surfaces are highly active after shot blasting; visible flash rust can appear in tens of minutes to hours in humid environments; once flash rust occurs, re-treatment is required. Line integration compresses this time window to a minimum — an important guarantee for coating quality stability.
Connection details to consider for line integration:
- The transition section length between the blasting chamber exit and coating inlet must accommodate blow-off, inspection, masking (protecting non-coated areas), and cooling.
- Blow-off devices must be effective — abrasive remaining on workpiece surfaces, internal cavities, and holes entering the powder booth or curing oven will cause coating defects and even equipment damage.
- Workpiece temperature must drop below the coating’s allowable range before spraying.
- Airflow direction between the blasting zone and coating zone should be designed from coating zone to blasting zone to prevent abrasive dust from contaminating wet paint surfaces or powder booths.
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3.6 Shot Peening (Extended Application)
The same type of equipment, after changing abrasive, adjusting projection speed and coverage, can be used for shot peening strengthening of gears, springs, crankshafts, connecting rods, and other parts — forming a residual compressive stress layer on the surface to improve fatigue strength and stress corrosion resistance. Strengthening processes have far higher requirements for abrasive particle size uniformity, hardness, coverage (typically requiring ≥99.7%, industry reference), and control precision than ordinary cleaning, requiring Almen test strips and arc height measurement and other testing methods.
3.7 Suitable & Unsuitable Workpieces Overview
| Suitable | Unsuitable / Requires Caution |
|---|---|
| Castings, forgings, stampings, welded structural components | Easily deformed thin-walled parts (reduce abrasive diameter and projection speed) |
| Frames, chassis, large structural components | Precision mating surfaces that cannot withstand impact (require masking protection) |
| Hydraulic supports, mining machinery components | Finished machined surfaces (unless specifically masked) |
| Various hangable batch workpieces | Aluminum alloy, stainless steel, and carbon steel mixed lines (abrasive cross-contamination causes electrochemical corrosion; must separate lines or change abrasive) |
| Pre-coating treatment parts requiring rust removal, descaling, texturing | Workpieces with large amounts of oil not pre-treated (should be degreased first) |
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4. Selection Methods & Parameter Determination
4.1 Information Checklist to Collect Before Selection
Most selection errors stem from incomplete preliminary information collection. It is recommended to fill in the following table before inquiry:
| Category | Content to Clarify |
|---|---|
| Workpiece | Name, material, maximum/minimum single-piece dimensions (L×W×H), single-piece weight, shape features (internal cavities, dead zones, thin walls), initial surface condition (rust grade, sand adhesion, oil, old paint) |
| Process objectives | Required cleanliness grade (Sa2/Sa2.5/Sa3), target roughness range, whether strengthening is required, whether stress relief is required |
| Capacity | Shifts (1/2/3), pieces or tons per hour or per shift, peak vs. average difference, 3–5 year capacity planning |
| Downstream process | Whether connecting to powder coating/paint line, coating cycle time, curing oven inlet temperature limit, available transition section length |
| Factory conditions | Available L×W×H (especially clear height), floor load capacity, whether pit excavation is allowed and depth, power supply capacity, compressed air pressure and flow, dust emission requirements |
| Hanging method | Hanging point positions, fixture type, whether rotation is required, fixture rotation radius |
| Other | Investment budget, delivery time, local environmental and safety requirements, spare parts supply |
4.2 Core Parameter Selection by Item
(1) Single-Hook Load Capacity & Maximum Workpiece Dimensions
These two parameters determine chamber cross-section, monorail specifications, and fixture design, and are first-priority parameters.
- Single-hook load: Common specifications cover hundreds of kilograms to several tons; typical single-hook loads for step-type monorail shot blasting machines include 300/500/800 kg grades (industry reference); heavy hydraulic support workpieces require selection based on actual single-piece weight with safety margin.
- Maximum workpiece dimensions: Chamber internal cross-section should leave sufficient clearance on all sides relative to the maximum workpiece outline to ensure abrasive projection space and prevent workpiece interference with chamber wall liners; also consider the rotation envelope circle when fixtures rotate, not just static outline dimensions.
- Always leave margin: Select based on “the largest workpiece that may appear in the future” rather than “current typical workpiece”; once the chamber is built, it cannot be expanded.
(2) Conveying Mode Selection
| Production Characteristics | Recommended Mode |
|---|---|
| Single product variety, uniform cycle time, extremely large batches | Continuous monorail shot blasting machine |
| Heavy workpieces, fixed-point loading/unloading, fixed-point blasting | Step-type monorail shot blasting machine |
| Line integration with coating line, inconsistent process cycle times, buffering required | Indexing monorail shot blasting machine |
(3) Blast Wheel Quantity, Power & Blasting Capacity
This determines cleaning capability.
- Quantity and arrangement: The more complex the workpiece and the more shadowed surfaces, the more blast wheels required. Main blasting chambers typically require arrangement from left, right, top, bottom, front, and rear directions to ensure coverage; large structural components often require 4 or more wheels.
- Blasting capacity (kg/min): The blasting capacity of a single blast wheel determines the projectile energy per unit time. Cleaning efficiency is positively correlated with “total blasting capacity × projection speed.”
- Total power estimation: Total machine power is mainly composed of blast wheel motors, elevator, screw conveyor, dust collector fan, and monorail drive; blast wheels account for the largest share. Total power for same-class monorail machines ranges from tens to over one hundred kilowatts (industry reference).
- How to judge if sufficient: Do not rely solely on nameplate power; require the manufacturer to provide projection simulation diagrams or projection coverage analysis, and conduct full-load process tests with actual workpieces during acceptance, measuring the minimum cycle time to achieve Sa2.5.
(4) Monorail Conveying Speed
- Speed range: Common operating speeds for monorail models are in the 0.3–3 m/min range (industry reference), must be steplessly adjustable.
- Relationship between speed and cleaning quality: Slow speed → longer abrasive exposure per piece → more thorough cleaning but lower capacity; fast speed → higher capacity but may not achieve grade requirements.
- Correct approach: First determine the “minimum effective speed” based on target cleanliness grade and measured results, then work backward to determine capacity, rather than setting capacity first and compressing time.
- Heavy rust, thick scale, strengthening workpieces: low speed; light rust, texturing only: relatively high speed.
(5) Chamber Length & Supplementary Blasting Chamber Configuration
- Main blasting chamber length must ensure workpieces stay in the effective projection zone long enough.
- Workpieces with dead zones must have supplementary blasting chambers (see 2.3), and the technical agreement must specify supplementary method, number of stations, independent dust extraction air volume, lighting illuminance, operating platform, and protection.
- Increased chamber length synchronously increases monorail length, fixture quantity, and investment; balance between coverage and cost is required.
(6) Abrasive (Media) Selection
Abrasive selection directly determines roughness, cleaning efficiency, and abrasive consumption cost.
By Particle Size (Industry Reference)
| Workpiece Type | Recommended Abrasive Particle Size |
|---|---|
| Thin plates, light parts, precision parts | 0.8–1.0 mm |
| Conventional profiles, general structural components | 1.0–1.5 mm |
| Thick plates, heavy parts, strengthening parts | 1.2–2.0 mm |
By Hardness (Industry Reference)
| Workpiece Material/Purpose | Recommended Abrasive Hardness |
|---|---|
| Carbon steel conventional cleaning | HRC 40–45 |
| Stainless steel, aluminum alloy | HRC 35–40 (low hardness, reduce embedding and scratching) |
| Surface strengthening | HRC 48–55 |
Abrasive Shape Selection
- Steel shot (spherical): High impact energy, mainly hammering action, good cleaning efficiency, relatively gentle roughness formation.
- Steel grit/angular grit: Strong cutting action, fast removal of thick scale and old coatings, deeper and rougher anchor pattern formation.
- Mixed ratio: In practice, the two are often mixed to balance efficiency and surface morphology. Industry reference steel grit mixing ratio is mostly 20%–40%, determined