Steel AR450
also Hardox 450
AR450 is a quenched and tempered abrasion-resistant plate at nominal 450 HBW (about 46 HRC), the intermediate grade between AR400 and AR500 and equivalent to Hardox 450.
Values for the Q&T condition
AR450 tempers and conditions
AR450 is supplied in 3 conditions, soft to hard. Q&T is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Heavy-gauge plate (>~50 mm), reduced core hardness | Thick plate where quench severity limits through-hardening; surface stays ~450 HBW but core strength and hardness drop — pick for heavy liners where only the wear face matters. | 1,150 | 1,350 | 11 | 45 HRC | 6.9 % IACS |
Formable/bendable variant | Tighter chemistry/cleanliness and better through-thickness ductility for press braking; pick when the wear part must be bent or flanged. | 1,200 | 1,420 | 12 | 45 HRC | 6.9 % IACS |
Q&TDefault Quenched and tempered | Standard stocked wear plate condition; pick for general abrasion resistance in liners, chutes, buckets and cutting edges. | 1,250 | 1,450 | 10 | 46 HRC | — |
Supply forms, finishes and certifications
Ways AR450 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Q&T-IT | Quenched & tempered, impact-tested | Certification |
What is AR450?
AR450 is a quenched and tempered abrasion-resistant plate at nominal 450 HBW (about 46 HRC), the intermediate grade between AR400 and AR500 and equivalent to Hardox 450. Typical values are about 1250 MPa yield and 1450 MPa tensile with 10% elongation, so it resists sliding abrasion while still carrying load as liners, bodies and chute plate. Service above roughly 250 °C removes the hardness, machining is slow, and cold bending needs an inside radius of about 4–5×t. AR400 bends and welds more easily; AR500 lasts longer in severe abrasion. AR450 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F). AR450 has a yield strength of 1,250 MPa (181 ksi) and a tensile strength of 1,450 MPa (210 ksi) — stronger than 95% of steel grades. Elongation at break is 10% and the elastic modulus is 210 GPa (30.5 Msi).
What is AR450 used for?
- Mining and quarry liners
- Dump truck bed floors and sides
- Bucket wear plates and cutting edges
- Chutes and hopper linings
- Crusher and screen plant liners
- Conveyor skirt and wear strips
- Recycling and shredder wear parts
Advantages
- High strength — 1,250 MPa (181 ksi), better than 95% of steel grades
Limitations
- Difficult to machine — 18/100, worse than 97% of steel grades
- Limited ductility — 10%, worse than 91% of steel grades
- Limited service temperature — 250°C (482 °F), worse than 85% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
- Low fracture toughness — 60 MPa·√m (54.6 ksi·√in), worse than 78% of steel grades
AR450 properties
Typical room-temperature values for AR450-Q&T; bars are the position among steel grades.
Physical3
AR450 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
AR450 has a yield strength of 1,250 MPa (181 ksi) and a tensile strength of 1,450 MPa (210 ksi) — stronger than 95% of steel grades. Elongation at break is 10% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
AR450 is rated for continuous service to 250°C (482 °F). It conducts heat at 35 W/m·K (20.2 BTU/hr·ft·°F), worse than 75% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical2
AR450 has an electrical resistivity of 2.5×10⁻⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of AR450 takes about 30 MJ of energy and emits 2.3 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 30%.
Manufacturability6
AR450's machinability is poor (18/100, worse than 97% of steel grades); weldability fair (45/100); formability poor (30/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. AR450 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with AR450
Is AR450 easy to machine?
Treat as ~45 HRC hardened steel: rigid setup, negative-rake carbide or CBN, low speed/high feed; prefer plasma/laser/waterjet cutting or drilling with carbide, and de-stress after thermal cutting.
Can AR450 be welded?
Weldable with low-hydrogen consumables (undermatching, ~500–700 MPa filler is usual); preheat 100–200 °C depending on thickness and CE, keep interpass below ~225 °C, no PWHT above the tempering temperature.
Can AR450 be formed, bent or molded?
Cold bending possible with min inside radius ≈4–5×t transverse to rolling direction (AR450F allows tighter); hot forming above ~250 °C destroys the hardness.
Manufacturability
The process limits FabDigit applies to AR450. Every AR450 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
CNC machining
| Machinability | Fair18 / 100 |
|---|---|
| ISO material group | P.2 |
| Cutting speed (rough / finish) | 180 / 210 m/min |
| Minimum wall | 0.8 mm |
| Minimum internal radius | 1 mm |
| Drill depth limit | 5× diameter |
| Best surface (machined / polished) | Ra 1.6 / — |
| Hardenable after machining | No |
Sheet metal
| Formability | Fair30 / 100 |
|---|---|
| Weldability | Better45 / 100 |
AR450 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Ccarbon equivalent controls preheat | 0.19 – 0.3 | 0.25 |
| Si | 0.15 – 0.7 | 0.35 |
| Mn | 0.8 – 1.7 | 1.3 |
| P | ≤ 0.03 | |
| S | ≤ 0.01 | |
| Cr | ≤ 1.2 | 0.6 |
| Nihigher in thick plate for hardenability/toughness | ≤ 1.5 | 0.3 |
| Mo | ≤ 0.6 | 0.25 |
| Bboron treated for through-hardening | ≤ 0.01 | 0 |
| Al | 0.02 – 0.06 | 0.03 |
| Tities up N so boron stays effective | ≤ 0.05 | |
| Nb+V | ≤ 0.1 | |
| Fe | balance |
What surface finishes work on AR450?
Supplied as mill/shot-blasted surface; protect with zinc-rich primer or industrial paint, or overlay/hardface wear faces — not anodizable and rarely polished.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
CVD Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel AR450 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- Hardox 450
How much does AR450 cost?
AR450 is a standard-cost steel ($$), cheaper than about 59% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
AR450 — frequently asked
What is AR450 used for?
AR450 is typically used for mining and quarry liners, dump truck bed floors and sides, bucket wear plates and cutting edges, chutes and hopper linings, crusher and screen plant liners and conveyor skirt and wear strips. In short: workhorse wear-resistant plate.
What is the yield strength of AR450?
AR450 has a typical yield strength of 1,250 MPa (181 ksi) and a tensile strength of 1,450 MPa (210 ksi) — stronger than 95% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is AR450 easy to machine?
Not especially — machinability is rated poor (18/100, worse than 97% of steel grades). Treat as ~45 HRC hardened steel: rigid setup, negative-rake carbide or CBN, low speed/high feed; prefer plasma/laser/waterjet cutting or drilling with carbide, and de-stress after thermal cutting.
Can AR450 be welded?
With care — weldability is rated fair (45/100). Weldable with low-hydrogen consumables (undermatching, ~500–700 MPa filler is usual); preheat 100–200 °C depending on thickness and CE, keep interpass below ~225 °C, no PWHT above the tempering temperature.
What surface finishes work on AR450?
Supplied as mill/shot-blasted surface; protect with zinc-rich primer or industrial paint, or overlay/hardface wear faces — not anodizable and rarely polished.
Can AR450 be formed, bent or molded?
Cold bending possible with min inside radius ≈4–5×t transverse to rolling direction (AR450F allows tighter); hot forming above ~250 °C destroys the hardness.
What is the maximum service temperature of AR450?
AR450 is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does AR450 cost?
AR450 is a standard-cost steel ($$), cheaper than about 59% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Can FabDigit make parts in AR450?
Yes — AR450 is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- Abrasion-resistant quenched & tempered plate, 450 HBW class datasheets — SSAB / Nucor / ArcelorMittal (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
- ASTM E140 / A370 hardness conversion and mechanical testing — ASTM (2021)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.