450 HB · Quenched and tempered · Permanent stock

Wear-resistant plate 450 HB Brinell

Hardness 3 times higher than structural plate. Service life multiplied 3 to 6 times in abrasive environments. The choice of equipment manufacturers in mining, public works, forestry and agriculture who cannot afford maintenance downtime.

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3.1 Certificate
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450 HB Specifications
Brinell hardness 425-475 HB
Yield strength ~1200 MPa
Tensile strength 1400-1600 MPa
Charpy 30 J @ -40°C
Elongation ≥ 10%
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Why hardness matters

Brinell hardness (HB) directly determines wear resistance. The higher the hardness, the longer the service life in abrasive environments.

S355 structural plate ~170 HB
Base service life
450 HB wear-resistant plate 425-475 HB
4-6× service life
450 HB: Optimal balance between hardness and weldability

⚠️ Tempering temperature when welding

Exceeding 250°C in the heat-affected zone destroys the hardness of the wear-resistant plate.

!
DO NOT EXCEED 250°C - Risk of hardness loss

When the heat-affected zone (HAZ) reaches temperatures above 250°C, an over-tempering occurs that transforms the hardened microstructure into a softer structure. Hardness can drop from 450 HB to 200-250 HB, creating a weak point where wear will concentrate. To avoid this: control heat input, use preheating according to thickness, and never exceed 250°C interpass temperature.

Formats

Thickness (mm) Available formats Availability
6 2,000×6,000–12,000 / 2,500×6,000–12,000 ✓ Immediate
8 2,000×6,000–12,000 / 2,500×6,000–12,000 ✓ Immediate
10 2,000×6,000–12,000 / 2,500×6,000–12,000 ✓ Immediate
12 2,000×6,000–12,000 / 2,500×6,000–12,000 ✓ Immediate
15 2,000×6,000–12,000 / 2,500×6,000–12,000 ✓ Immediate
20 2,000×6,000–12,000 / 2,500×6,000–12,000 ✓ Immediate
25 2,000×6,000–12,000 / 2,500×6,000–12,000 ✓ Immediate
30 2,000×6,000–12,000 / 2,500×6,000–12,000 ✓ Immediate
40 2,000×6,000–12,000 / 2,500×6,000–12,000 ✓ Immediate
50 2,000×6,000–12,000 / 2,500×6,000–12,000 ✓ Immediate
60 2,000×6,000–12,000 / 2,500×6,000–12,000 ✓ Immediate
70 2,000×6,000–12,000 / 2,500×6,000–12,000 ✓ Immediate
80 2,000×6,000–12,000 / 2,500×6,000–12,000 ✓ Immediate
100 2,500×length on request → On request
120 2,500×length on request → On request
150 2,500×length on request → On request

Recommended preheating by thickness

Thickness Preheating Notes
≤ 15 mm No preheating Ambient temp ≥ 10°C
15 - 25 mm 50°C minimum Measure with IR thermometer
25 - 50 mm 75 - 100°C Maintain during welding
> 50 mm 100 - 150°C Low-hydrogen consumables

Complete technical specifications

Mechanical properties, chemical composition and brand equivalences.

Mechanical properties by hardness level

Grade Hardness (HB) Yield strength Tensile strength Charpy Elongation
450 HB 425-475 ~1200 MPa 1400-1600 MPa 30 J / -40°C ≥ 10%

Industrial applications of 450 HB

Where 450 HB wear-resistant plate makes a difference in service life.

✔

Hoppers and bodies

Mining and public works dump trucks. Service life multiplied by 4-6.

✔️

Buckets and blades

Excavators and loaders. Wear resistance against rock contact.

✔

Linings

Crushers, mills and screens. Protection against severe abrasion.

✔

Conveyor systems

Conveyor belts for aggregates and ore. Greater durability.

✔

Forestry shredders

Bodies and linings of delimbers and shredders.

✔

Agricultural machinery

Seeders, plows, subsoilers in stony terrain.

✔

Concrete plants

Hoppers and silos at quarries. Resistance to abrasive aggregates.

✔️

Recycling plants

Wear parts in shredding waste and C&D debris.

Target sectors

Industries where the cost of downtime justifies investment in wear-resistant plate.

⛏️

Mining and aggregate extraction

Where the hourly cost of downtime for an excavator or dump truck justifies any improvement in service life.

Hoppers Buckets
🏗️

Public works and civil engineering

Cost of replacing blades and hoppers during the construction season. Every stoppage is a loss of productivity.

Blades Bodies
🌲

Forestry machinery and shredders

Delimbers and shredders that process wood with soil and stones. Constant abrasive wear.

Linings Bodies
🚜

Large agricultural machinery

Subsoilers, plows and seeders in stony terrain. Service life critical to profitability.

Shares Discs
♻️

Recycling and waste management plants

Shredders for C&D waste, municipal solid waste and scrap metal. Extreme wear.

Jaws Linings
🔄

Conveyor system manufacturers

Conveyor belts, hoppers, unloaders for abrasive material. Wear components.

Rollers Chutes

Frequently asked questions

Detailed technical answers for engineers and buyers about 450 HB wear-resistant plate.

Have more questions? Contact us
Wear-resistant plate is a high-hardness steel specifically designed to withstand abrasion and wear in aggressive industrial environments. Unlike S355 structural plate, which has a hardness of approximately 170 HB Brinell, 450 HB wear-resistant plate has nearly three times the surface hardness. This is achieved through a quenching and tempering heat treatment that optimizes the microstructure to resist friction wear. While structural plate is designed to withstand mechanical loads, wear-resistant plate is formulated to last in contact with abrasive materials such as rock, ore, aggregates and soil. The difference in service life can be 3 to 6 times in intense wear applications.
The different hardness grades of wear-resistant plate represent a balance between wear resistance and other mechanical properties. 450 HB plate is the industry standard and the optimal balance: enough hardness to multiply service life by 4 to 6 times, while maintaining acceptable weldability with precautions. 400 HB offers a combination of hardness and toughness, ideal when there is moderate impact in addition to abrasion. It is the easiest to weld and form. 500 HB maximizes wear resistance but sacrifices weldability and requires special techniques. The choice depends on the type of abrasive, whether there is associated impact, and whether the part needs welding during manufacturing or repair.
Yes, 450 HB wear-resistant plate can be welded, but it requires special precautions that are not necessary with S355 structural steel. The main risk is exceeding the tempering temperature (approximately 250°C for 450 HB) in the heat-affected zone, which would locally reduce hardness and compromise wear resistance. Preheating according to thickness is recommended: no preheating up to 15 mm, 50°C for 15-25 mm, 75-100°C for 25-50 mm, and 100-150°C for greater thicknesses. Consumables must be low-hydrogen and heat input must be strictly controlled. For field repairs, it is recommended to use electrodes specific to wear-resistant plate and short-pass techniques with controlled cooling between passes.
In a mining or public works truck hopper working under intensive quarry or mining conditions, the difference is dramatic. A hopper made from S355 structural plate has an estimated service life of 6 to 12 months before wear compromises its structural integrity. The same hopper made from 450 HB wear-resistant plate lasts 3 to 5 years under identical operating conditions. This represents a multiplication factor of 4 to 6 times in service life. The material cost difference (450 HB plate costs approximately 2-3 times more than S355) is fully recovered within the first year, considering only the cost of one avoided replacement, without counting the value of production hours not lost to maintenance downtime.
The economic tipping point for using 450 HB wear-resistant plate instead of S355 structural plate depends on several factors, but as a general rule, it is worth it when the component is in continuous or frequent contact with abrasive materials and replacement requires machine downtime. Specifically: in mining and aggregate extraction where contact with crushed rock is constant; in public works when blades and hoppers work with trench material or rubble; in forestry with shredders that process wood with soil and stones; and in agriculture for subsoilers and plows in stony terrain. If a part is replaced more than once a year due to wear, the economics clearly favor 450 HB. The hourly cost of downtime for a mining excavator or dump truck makes even small improvements in service life profitable.
Yes, Mayor Steel maintains permanent stock of 450 HB wear-resistant plate in thin thicknesses from 6 mm, which are the most in-demand for hopper linings, excavator buckets, and wear parts in agricultural and forestry machinery. The fastest-moving thicknesses are 6, 8, 10, 12, 15, 20, 25, 30, 40, 50 and 60 mm, available in standard formats of 2000×6000 mm and 2500×8000 mm. Thin thicknesses (6-12 mm) have immediate availability with delivery in 24-48 hours within the Iberian Peninsula. For special thicknesses or custom dimensions, the lead time is 5-10 business days. All plates are supplied with a 3.1 quality certificate according to EN 10204, guaranteeing the specified hardness and mechanical properties.
Exceeding the tempering temperature (approximately 250°C for 450 HB plate) during welding is the most common and costly error when working with this material. When the heat-affected zone (HAZ) reaches temperatures above 250°C, an over-tempering occurs that transforms the hardened microstructure (tempered martensite) into a softer structure (ferrite with carbides). The result is a drastic reduction in hardness in that zone, which can drop from 450 HB to values of 200-250 HB, similar to structural plate. This soft zone will wear much faster than the rest of the part, creating a weak point where wear will concentrate and potentially perforating the part prematurely. To avoid this, heat input must be controlled (maximum 1.5 kJ/mm), appropriate preheating according to thickness must be used, and interpass temperature must never exceed 250°C.

Tired of replacing parts every year?

450 HB wear-resistant plate multiplies service life by 3 to 6 times. The cost of the material is recovered with the first avoided replacement.

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450 HB Wear-Resistant Plate: The Solution for Abrasive Environments

The 450 HB wear-resistant plate is the industry standard for applications subject to intense abrasive wear. With a Brinell hardness of 425-475 HB, it offers nearly three times the wear resistance of conventional S355 structural plate (~170 HB). This jump in hardness translates directly into a service life multiplied by 3 to 6 times, depending on the type of abrasive and operating conditions.

Key industrial applications

The main consumer sectors for 450 HB wear-resistant plate are mining and aggregate extraction, where hoppers, buckets and crusher linings suffer extreme wear; public works, with grader blades and dump truck bodies; forestry machinery, where shredders process wood mixed with soil and stones; and large agricultural machinery, especially subsoilers and plows working in stony terrain. In all of these sectors, the economic case is clear: the material cost difference is recovered within the first year through the elimination of replacements.

Weldability considerations

A critical aspect when working with 450 HB wear-resistant plate is weldability. Unlike structural plate, the quenching and tempering that gives it its high hardness also makes it more sensitive to welding heat. Exceeding the tempering temperature (~250°C) in the heat-affected zone causes an irreversible loss of hardness. For this reason, it is essential to control heat input, use preheating according to thickness, and select low-hydrogen consumables. Mayor Steel provides technical guidance on the correct welding procedures to maintain the material's properties.

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