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Choosing wear-resistant steel plate starts with the wear mechanism, not the biggest hardness number. Use tougher 400–450 HBW plate where rock impacts, gouges, or deforms the part; use 450–500 HBW plate in supported sliding zones; and consider chromium-carbide overlay, ceramic, or manganese when the duty specifically calls for them. Then set thickness from measured wear, impact energy, support, fabrication limits, and acceptable added weight.
A bucket, hopper, or transfer chute normally needs several zones rather than one grade throughout. This guide explains how to select the grade, thickness, attachment method, and acceptance documents for each zone, with published starting ranges clearly identified as planning examples rather than universal design rules.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWhat does AR400, AR450, AR500, or NM500 actually mean?
AR means abrasion resistant. The number is a nominal Brinell hardness class: AR400 is about 400 HBW and AR500 about 500 HBW. It is not a complete chemical specification or a structural-steel grade. Commercial AR400 is commonly described in the 360–440 HBW range, while AR500 is often around 450–540 HBW, but suppliers use different chemistry and tolerance windows.
Chinese NM grades such as NM400 and NM500 are associated by suppliers with GB/T 24186. They are commercial cousins of AR400 and AR500, not automatically interchangeable products. Compare the measured hardness band, impact result, chemistry, thickness range, and delivery condition on the mill certificate rather than relying on the label.
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There is no single worldwide AR product standard equivalent to the structural-steel standards used for grades such as S355 or ASTM A572 Grade 50. A wear plate can be hard enough for abrasion yet unsuitable as the primary load-carrying shell. Keep the structural member and sacrificial liner as separate design decisions.
Gnee’s grade guide describes AR400 as normally 360–440 HBW and AR500 as 450–540 HBW, while noting that mills can use different recipes to reach the target. Treat those figures as commercial ranges, not a universal specification.
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The first selection question is the material path and load path: where does the material slide, where does it strike, and where does the structure flex? As Alloy Materials puts it, “The first question is not ‘How hard do I want the plate to be?’ It is ‘How is the material actually wearing?’”
| Wear mechanism | What it does | Typical response |
|---|---|---|
| Low-stress sliding abrasion | Fine particles scrape and micro-cut the surface | Use a supported 450–500 HBW plate; consider overlay for a flat, low-impact liner |
| High-stress grinding | Hard particles crush against the liner | Use higher hardness only if the backing prevents denting and cracking |
| Gouging | Angular lumps plough a deep groove | Increase thickness and toughness; zone the gouge path |
| Impact | Large lumps deform, crack, or spall the surface | Use 400–450 HBW, a stiff backing, and impact bars or sacrificial blocks |
| Erosion | Fast fines in air or slurry remove material continuously | Use a wear system selected for the fluid, temperature, and particle speed |
| Corrosive or hot wear | Corrosion or heat changes the failure mechanism | Use a corrosion/high-temperature grade or a compatible overlay; do not simply increase HBW |
Most equipment combines mechanisms. A transfer point may have an impact box, a sliding floor, a bend that scours locally, and a discharge lip. That is why one plate grade and one thickness over the entire chute usually wastes either service life or fabrication budget.
Which hardness class belongs in each zone?
Use the lowest hardness class that meets the measured wear rate, then reserve higher grades for zones where sliding abrasion justifies their fabrication and impact trade-offs.
- Bucket shell, heel, lip support, and rock-strike areas: 400 or 450 HBW, with thickness and backing doing much of the impact work.
- Bucket floors and side liners with mostly sliding sand, gravel, or crushed stone: 450 or 500 HBW when the plate is adequately supported and the shop can form and weld it.
- Chute or hopper impact boxes: tougher 400 or 450 HBW, usually thicker and backed by a stiff structure. Add impact bars rather than jumping straight to 550 or 600 HBW.
- Chute sliding floors, skirt liners, and sharp, fast fines with little impact: 500 HBW or a chromium-carbide overlay that can remain flat.
- Edges, teeth, adapters, and cutting systems: use the engineered or OEM component. A generic AR500 blank does not automatically have the required geometry, bolt pattern, section strength, or attachment capacity.
Harder is not automatically better. FuseTech notes that AR500 resists sliding wear better, while AR400 can tolerate impact without cracking. A cracked hard liner can lose service faster than a tougher, slightly softer plate.
What is the difference between AR400 and AR500 wear plate?
AR500 generally offers more resistance to sliding abrasion, while AR400 generally offers better toughness, formability, and welding tolerance. The correct choice depends on whether the dominant failure is material removal or impact damage.
| Factor | AR400-class | AR500-class |
|---|---|---|
| Typical commercial hardness | About 360–440 HBW | About 450–540 HBW |
| Best fit | Mixed abrasion and impact; formed bucket parts; impact boxes | Supported sliding floors and severe fine-particle abrasion |
| Impact and crack tolerance | Generally more forgiving | Lower margin if support or welding is poor |
| Forming and drilling | Easier than 500-class plate | Requires larger bend radii and better tooling; field drilling is difficult |
| Welding | Usually less demanding, but still procedure-controlled | Higher carbon equivalent and restraint sensitivity require strict procedure control |
Do not convert a nominal grade into a promised life multiplier. Published supplier ranges may show AR500 lasting longer than AR400 in sliding abrasion, but no universal percentage applies across buckets, chutes, impact heights, and materials.
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How should an excavator bucket be zoned?
A bucket is a structural shell protected by sacrificial components. Select each component for its local load instead of making the whole bucket from the hardest available plate.
| Bucket location | Practical grade direction | Published planning thickness |
|---|---|---|
| Shell or back | Structural plate, or tough AR400-class where abrasion is part of the design | 6–16 mm illustrative band |
| Floor | NM400/AR400 for general service; NM500/AR500 for aggressive sliding where impact is manageable | 8–25 mm integral or replaceable liner; 8–20 mm general-service example |
| Quarry floor liner | NM500/AR500 in sliding zones, with AR400/450 at impact zones | 10–25 mm illustrative band |
| Heel and rear corners | AR400/450 plus wear strips, heel shrouds, or replaceable blocks | 12–30 mm plus local protection |
| Side walls | AR400/450; AR500 only where severe sliding is well supported | 8–20 mm illustrative band |
| Internal strips and buttons | Replaceable NM500 strips or wear buttons | 6–16 mm illustrative band |
| Lip and cutting edge | OEM-compatible edge, adapter, and tooth system | Do not substitute a generic liner without a geometry and load check |
These bands come from Promisteel’s application-planning examples. They must be checked against machine size, structural loads, rock size, attachment geometry, welding procedure, OEM requirements, and local safety rules.
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Bucket weight matters. Steel weighs about 7.85 kg per square metre per millimetre of thickness. A 10 mm liner over 2 m² adds about 157 kg. That weight is lifted every cycle and reduces payload, so a thicker or harder liner is not free service life.
On mixed contractor work, a 400 or 450 HBW bucket often gives a better balance than 500 HBW. In a quarry bucket, use tougher material at the heel, lip support, and rock-drop points, then reserve 500-class plate for supported floor or side strips that experience mainly sliding.
Which thickness should be selected for a chute or hopper liner?
Thickness is both a wear allowance and a structural decision. Start with measured loss per hour, cycle, or tonne; then check impact energy, support spacing, fastener loads, shell stiffness, and the change-out limit before the parent steel is exposed.
| Duty | Indicative thickness | Grade and design note |
|---|---|---|
| Fine sinter, coke breeze, cement, fly ash | 6–10 mm | Free-flowing material; geometry and thinning allowance often govern |
| Coal, sand, gravel, aggregate below 50 mm | 10–20 mm | Partial coverage may work on steep, smooth slopes |
| Lump ore, rock, clinker, 50–300 mm | 20–40 mm | Use a 400 HBW class and impact bars at loading points |
| Run-of-mine ore or primary-crusher feed with a large drop | 40–80 mm on structural backing | Stiffen the shell; hard plate alone is not an impact design |
The table reflects Gnee’s 2019 indicative ranges. Promisteel’s more recent planning examples use about 10–30 mm for a defined impact zone and 6–20 mm for a replaceable sliding zone. These figures are not contradictory standards: they address different support, particle-size, drop-height, and layout assumptions. Measure the existing liner and model the actual duty instead of averaging the ranges into a supposed standard.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsSeparate the impact box from the downstream floor. Make the impact section thick and tough, use replaceable panels, increase thickness at bends and transitions where scour concentrates, and keep weld seams out of the primary flow. Set a change-out thickness before wear reaches the shell, fastener heads, or critical welds.
When is chromium-carbide overlay better than through-hardened plate?
Chromium-carbide overlay (CCO) suits flat chute, hopper, and transfer liners with severe sliding abrasion and limited shock. It is less suitable where the liner must be sharply formed, repeatedly struck by large rock, or flexed in service.
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CCO is a mild-steel backing with a welded high-chromium layer. Sunwill describes overlays containing roughly 25–40% chromium and several percent carbon, forming chromium carbides commonly around 1,200–1,800 HV (about HRC 58–62). Small stress-relief cracks in the overlay can be normal because they arrest in the backing; heavy shock can still fracture the layer.
| Duty | Typical overlay thickness | Example build notation |
|---|---|---|
| Light: grain, fertilizer, wood chips, fly ash | 3–4 mm | 4+3, 5+3, or 6+3 mm |
| Medium: aggregate, limestone, sand | 5–6 mm | 6+4, 8+4, or 8+5 mm |
| Heavy: crusher discharge, clinker, hard-rock transfer | 8–10 mm | 8+6 or 10+8 mm |
| Extreme: dump hoppers, grizzly discharge, high-tonnage hard ore | 12–20 mm | 10+10, 12+12, or 15+15 mm |
The notation is base thickness plus overlay thickness. Plan for the fact that full carbide density may not extend through the entire overlay; the backing must resist denting and provide a weld section. Bolt or plug-weld panels where possible, and do not bend them like ordinary mild steel.
Through-hardened AR plate remains hard as it wears down and is usually the more versatile choice for buckets, bodies, and mixed impact-and-abrasion liners. Ceramic or rubber-backed tile can deliver several times the steel life in the right transfer application, but brittle tile can crack in a rock-drop zone. Manganese steel is a better candidate for high-impact, work-hardening crusher service and a poor choice for fine sliding abrasion.
What thickness and grade data should be on the purchase order?
A trade name is not an acceptance test. Put the measurable requirements and traceability on the order:
- Hardness band: state the minimum and maximum HBW at the purchased thickness, not only “AR500.”
- Test method: specify Brinell to ISO 6506-1 or ASTM E10, using a 10 mm tungsten-carbide ball and 3000 kgf where applicable.
- Test locations: define the number and position of readings per plate or lot.
- Impact requirement: state the test temperature, absorbed energy, specimen orientation, and ISO 148-1 or ASTM E23 method. Do not confuse J/cm² values sometimes reported for NM plate with Charpy joules.
- Thickness and tolerance: identify the tolerance and flatness standard, such as GB/T 709, EN 10029, or ASTM A6/A6M as an export reference.
- Delivery condition: require quenched-and-tempered plate where that is the specified product condition, not as-rolled or normalised plate.
- Chemistry and weldability: request carbon equivalent and the mill’s welding guidance for the exact thickness.
- Surface and edges: specify as-rolled, shot-blasted, or primed surface; edge condition; and whether flame-cut edges require machining.
- Traceability: require heat, plate, bundle marking, and a mill test certificate tied to the supplied pieces.
Hardness readings must be taken on prepared steel, not mill scale or a flame-cut edge. A decarburised skin can read tens of points low; flame-cut edges also contain a softened heat-affected band. Grind or machine the specified depth before acceptance and keep the certificate with the cut parts.
How should wear plate be cut, formed, drilled, and welded?
Fabrication limits can eliminate a harder grade even when abrasion would prefer it. Follow the plate maker’s procedure for the named product, thickness, restraint, and ambient conditions.
Forming
Bend radius increases with hardness and thickness. A conservative supplier rule is about three times thickness for 400 HBW plate and about five times thickness for 500 HBW, with larger radii above roughly 20 mm and bending across the rolling direction where geometry allows. The manufacturer’s forming window controls; generic radius tables are not interchangeable.
Cutting and drilling
Plasma and oxy-fuel are common from about 10 mm upward; waterjet limits heat-affected damage where an edge is highly stressed; laser suits thinner plate. Grind softened thermal-cut material off a bucket lip or any edge that must itself resist wear. Field drilling of AR500 is poor practice: have holes cut by the supplier or use through-holes with a backing nut or a weldable structural insert rather than tapping the hard plate.
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Welding
Use low-hydrogen consumables, clean to bare metal, control heat input and interpass temperature, and follow the named plate’s welding procedure. E7018-type low-hydrogen electrodes are commonly used to attach wear plate to a structural shell because the weld metal remains tough.
Preheat guidance varies because carbon equivalent, thickness, restraint, hydrogen, and product recipe vary. A report of SSAB guidance says Hardox 400 up to 20 mm may require no preheat under its specified conditions, while generic AR400 guidance can call for roughly 93–177 °C. Other supplier examples suggest about 100–150 °C for AR450 and essential, thickness-dependent preheat for AR500. These are not conflicting instructions for one plate; they apply to different products and assumptions. Use the plate maker’s qualified procedure rather than copying a blog number.
Keep weld seams out of the main flow, overlap liners so material cannot attack a leading edge, and avoid continuously welding a large panel around its perimeter if restraint will distort the shell. Intermittent fillets, plug welds, countersunk bolts, or replaceable modules can reduce distortion. Do not flame-straighten finished wear plate or grind it blue or straw; local tempering can create a soft strip that wears first.
Should liners be welded or bolted?
Welded liners suit permanent bucket protection when the substrate is clean, dry, and accessible. Bolt-on or plug-welded modules suit chutes and loader edges where fast replacement, reversibility, or minimal heat input matters.
- Close gaps or overlap panels so material cannot work behind them and lever them off.
- Keep the sliding face flush; countersunk fasteners can be covered with wear-resistant plugs where necessary.
- Provide support spacing that prevents a wide panel from flexing and cracking fasteners.
- Use replaceable strips at bends, transitions, discharge lips, and known scour bands.
- Do not weld a hardfacing patch across a structural crack; repair the structure first and treat hardfacing as a local wear upgrade.
How do you inspect and replace a worn liner?
Inspect by zone and replace before the parent structure is exposed. Record thickness at marked points so the next selection is based on the site’s actual wear rate.
- Mark repeatable inspection points on the floor, heel, side, impact box, bend, and discharge lip.
- Measure with calipers at an accessible worn edge or with an ultrasonic thickness gauge on the plate and backing.
- Record millimetres lost per hour, cycle, or tonne, plus the material stream and operating conditions.
- Look for knife-edged leading edges, flow-direction grooves, holes, missing perimeter welds, rounded heels, bulges, buckles, and cracks.
- If a panel remains sound and has substantial thickness above the site’s change-out limit, schedule another measurement. A supplier rule of thumb is to recheck when readings are still above about half the original thickness, but local deep loss or cracking overrides that rule.
- Replace a panel when general loss, a crack, buckling, or a failed attachment can detach it. Patch only local loss when the surrounding plate and structure remain sound.
Keep common replacement panels in stock, label the installed grade and thickness, and compare service hours rather than price per kilogram. A more expensive liner that reduces change-outs can have the lower cost per tonne handled, but the result must be established from your own records.
What do Hardox product bands illustrate?
Brand families show why the hardness–toughness trade-off must be specified by thickness and test direction. The following figures are from SSAB’s product-program page accessed November 2026; availability and exact guarantees depend on the current datasheet and purchased thickness.
| Product | Published hardness and thickness envelope | Selected impact or use information |
|---|---|---|
| Hardox 400 | 370–430 HBW; 2.0–130.0 mm | 45 J longitudinal typical at −40 °C; moderate wear, high toughness and weldability |
| Hardox 450 | 425–475 HBW; 0.8–160.0 mm | 50 J longitudinal typical at −40 °C; 50 HBW above AR400 grades |
| Hardox 500 | 450–540 HBW envelope; 2.0–103.0 mm | 37 J longitudinal typical at −40 °C; lower impact figure than 400/450 |
| Hardox 500 Tuf | 475–505 HBW; 2.0–38.1 mm | 27 J transverse at −40 to −20 °C; 50 J longitudinal at −40 °C |
| Hardox 550 | 525–575 HBW; 8.0–65.0 mm | 30 J longitudinal at −40 °C; liners, crushers, and recycling hammers |
| Hardox 600 | 550–640 HBW; 2.5–65.0 mm | For extreme material-handling and processing wear where fabrication is controlled |
| Hardox Extreme | 57–63 HRC delivered; typically 650–700 HBW; 8.0–19.0 mm | Extreme abrasion liners; limited forming latitude |
| Hardox HiTuf | 310–370 HBW; 40.0–160.0 mm | Guaranteed 40 J at −40 °C in page prose; thick structural wear parts |
| Hardox HiAce | Nominal 450 HBW; 3.0–100.0 mm | Designed for corrosive or elevated-temperature wear |
Impact figures marked longitudinal or typical are not interchangeable with guaranteed transverse Charpy results. Specify the orientation and guarantee you require. Carbon-equivalent ranges also rise as hardness increases, which helps explain why welding and forming become less forgiving.
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How do you choose between through-hardened plate, overlay, ceramic, and manganese?
Choose the material family that matches the dominant failure mode and the way the liner must be fabricated.
- Through-hardened AR or branded wear plate: the general-purpose choice for buckets, bodies, and mixed abrasion/impact liners that must be cut, formed, welded, or drilled.
- Chromium-carbide overlay: severe sliding abrasion on flat, replaceable panels with limited shock; bolt or plug-weld it and accept reduced formability.
- Ceramic or rubber-backed tile: high sliding or erosion life where installation can accommodate brittle components; avoid direct large-rock drops unless the system is engineered for them.
- Manganese steel: high-impact service where work hardening develops, such as selected crusher liners; not a first choice for fine sliding abrasion.
- Hardfacing: a local repair or wear upgrade on a sound base, not a substitute for a missing liner or cracked structure.
Supplier comparisons sometimes report overlay life many times that of mild steel in sliding abrasion, but those are representative ranges, not guaranteed site results. Use the plant’s measured wear rate and cost per service hour or tonne to make the final decision.
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- Map the material path and mark impact, sliding, gouging, bends, edges, and corrosion or heat zones.
- Measure existing liner thickness and loss rate by zone; record particle size, drop height, throughput, and operating temperature.
- Select the lowest hardness class that meets the measured wear rate: generally 400/450 HBW for impact and 450/500 HBW for supported sliding.
- Set thickness as wear allowance plus structural and dent resistance, checking support spacing and added mass.
- Choose through-hardened plate, overlay, ceramic, manganese, or a hybrid layout according to the failure mechanism.
- Verify bend radius, cutting method, hole design, weld procedure, preheat, interpass temperature, and heat input for the exact plate certificate.
- Specify hardness band, test methods, impact orientation and temperature, thickness tolerance, flatness, delivery condition, chemistry, surface, edge, marking, and certificate traceability.
- Design safe replacement access and define the change-out limit before the parent structure or attachment is damaged.
- Review the first campaign’s recorded wear by zone and revise the next liner layout instead of applying one grade everywhere.
In short, increase hardness where supported sliding abrasion dominates, preserve toughness where impact and deformation dominate, and use replaceable components wherever maintenance access allows. That zoning approach is more reliable than choosing the hardest plate or copying a single thickness table.
Frequently Asked Questions
Is NM500 always better than NM400 for an excavator bucket?
No. NM500 can improve life on a supported floor that sees aggressive sliding, but NM400 or NM450 is often safer at the heel, lip support, and rock-impact zones. Confirm the actual hardness, impact result, chemistry, and weld procedure on the certificate because the labels do not guarantee identical properties between mills.
Is a higher HBW grade always better for a chute liner?
No. A very hard liner can crack or spall when the drop height and lump size are high. A thicker 400–450 HBW impact section with a stiff backing, followed by a harder sliding panel, often gives a longer overall campaign.
What thickness should an excavator bucket’s wear liner be?
There is no universal thickness by excavator weight. Published planning examples put general bucket floors around 8–20 mm and quarry floor liners around 10–25 mm, but the correct value depends on existing floor thickness, rock size, impact, support, payload penalty, and measured wear.
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Can chromium-carbide overlay plate be bent around a chute corner?
Usually only within the supplier’s specific forming limits, and many overlay products are intended to remain flat. Use segmented panels or a through-hardened grade at tight bends, then reserve overlay for flat sliding surfaces.
How can I tell whether a worn liner must be replaced now?
Replace it when a crack, buckle, hole, detached weld, or local deep loss threatens the backing or could release the panel. Marked ultrasonic readings and repeatable caliper measurements are more useful than appearance alone; compare them with a defined change-out thickness before each inspection.
