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NM550 Abrasion Resistant Steel Plate

520~580 HBW Quenched & Tempered Extreme Wear Applications
Surface Hardness: 520 ~ 580 HBW

Chinese NM550 high strength abrasion resistant steel plate — engineered for extreme wear conditions in mining, quarrying, and heavy machinery. Meets GB/T 24186-2022 standard.

Extended Service Life

520-580 HBW hardness delivers exceptional wear resistance, 8-12x longer life than structural steel.

High Strength & Hardness

Ultra-high hardness 520-580 HBW, superior abrasion resistance for extreme conditions.

Good Workability

Can be cut, and welded using proper procedures and preheating.

Decoding the Grade: NM550

N 耐磨 – Wear / Abrasion resistant
M 磨 – Abrasion reinforced
550 Typical Brinell Hardness (HBW)

International Standards & Comparisons

🇨🇳

China (GB/T 24186)

NM550 / NM550D/E

Chemical Composition (wt%, max unless range):
C ≤0.38, Si ≤0.70, Mn ≤1.70, P ≤0.020, S ≤0.010,
Cr ≤1.50, Ni ≤1.50, Mo ≤0.70, Ti ≤0.05, B 0.0005-0.006, Als ≥0.010
Hardness: 520~580 HBW (≤70mm)
Tensile: Negotiated (by agreement)
🇺🇸

USA (ASTM / AR Standard)

AR550 / AR550F

Typical Composition (wt%):
C 0.28-0.38, Si 0.20-0.60, Mn 0.70-1.60, P ≤0.025, S ≤0.010,
Cr 0.80-1.50, Ni ≤1.20, Mo 0.30-0.70, B 0.0005-0.005
Hardness: 520~580 HBW
🇩🇪

Germany (DILLINGER)

XAR® 550

Typical Composition (wt%):
C ≤0.35, Si ≤0.55, Mn ≤1.60, P ≤0.020, S ≤0.010,
Cr ≤1.2, Ni ≤1.2, Mo ≤0.6, B ≤0.004
Hardness: 520~580 HBW
🇸🇪

Sweden (SSAB)

Hardox® 550

Typical Composition (wt%):
C 0.28-0.35, Si ≤0.70, Mn ≤1.60, P ≤0.025, S ≤0.010,
Cr ≤1.2, Ni ≤1.2, Mo ≤0.6, B ≤0.004
Hardness: 520~580 HBW

Note: NM550 provides ultra-high hardness for extreme abrasion conditions. AR550/XAR550/Hardox550 are approximate commercial equivalents.

Domestic Grade Comparison (NM550 / NM550D / NM550E)

📋

NM550 (Standard)

Base Grade / Extreme Wear Applications

Chemical Composition (wt%, max):
C ≤0.38, Si ≤0.70, Mn ≤1.70, P ≤0.020, S ≤0.010,
Cr ≤1.50, Ni ≤1.50, Mo ≤0.70, Ti ≤0.05, B 0.0005-0.006
Hardness: 520~580 HBW (≤70mm)
Tensile: By agreement
Impact: Not guaranteed (by agreement)
❄️

NM550D (Low Temperature)

D Grade / -20°C Impact Toughness

Chemical Composition (wt%, max):
C ≤0.38, Si ≤0.70, Mn ≤1.70, P ≤0.015, S ≤0.005,
Cr ≤1.50, Ni ≤1.50, Mo ≤0.70, Ti ≤0.05, B 0.0005-0.006, Als ≥0.015
Hardness: 520~580 HBW (≤70mm)
Tensile: By agreement
Impact: By agreement (D: -20°C)
CEV ≤0.72 (≤50mm) / ≤0.82 (>50mm)
🧊

NM550E (Extra Low Temperature)

E Grade / -40°C Impact Toughness

Chemical Composition (wt%, max):
C ≤0.38, Si ≤0.70, Mn ≤1.70, P ≤0.015, S ≤0.005,
Cr ≤1.50, Ni ≤1.50, Mo ≤0.70, Ti ≤0.05, B 0.0005-0.006, Als ≥0.015
Hardness: 520~580 HBW (≤70mm)
Tensile: By agreement
Impact: By agreement (E: -40°C)
CEV ≤0.72 (≤50mm) / ≤0.82 (>50mm)

According to GB/T 24186-2022, NM550D and NM550E are low-temperature impact grades. Impact values and tensile properties shall be agreed upon between supplier and buyer.

Why Choose NM550 Wear Plate?

Superior Abrasion Resistance

520-580 HBW hardness delivers maximum wear resistance for extreme abrasive environments.

High Hardness Retention

Optimized heat treatment ensures uniform hardness distribution through thickness.

Good Fabrication

Cutting and welding with proper procedures and preheating.

Typical Applications

Mining & Quarrying

Crusher liners, screen decks, chutes, hoppers, slurry lines

Construction Equipment

Excavator buckets, loader buckets, ground engaging tools, wear parts

Heavy Transport

Mining truck bodies, dump truck liners, heavy-duty trailer floors

Material Handling

Conveyor chutes, transfer points, silos, hoppers, wear liners, slurry pipelines

Customization Services

Cut-to-size / Precision cutting
Plasma / Waterjet cutting
Drilling / Machining
Surface treatment / Painting
Heat treatment (quenching & tempering)
Third-party inspection (SGS, BV)

Contact us for custom requirements — no minimum order restrictions for processing!

Available Stock Sizes

Thickness (mm) Width (mm) Length (mm) Stock Status
6 - 12 1500 - 2500 6000 - 12000 ✓ In Stock
14 - 25 2000 - 2800 8000 - 12000 ✓ In Stock
30 - 50 2000 - 3000 8000 - 12000 ✓ In Stock
55 - 70 2000 - 3000 6000 - 10000 Made to Order

Chemical Composition (GB/T 24186-2022)

Grade C Si Mn P S Cr Ni Mo Ti B Als
NM550 (max) ≤0.38 ≤0.70 ≤1.70 ≤0.020 ≤0.010 ≤1.50 ≤1.50 ≤0.70 ≤0.05 0.0005-0.006 ≥0.010
NM550D/E (max) ≤0.38 ≤0.70 ≤1.70 ≤0.015 ≤0.005 ≤1.50 ≤1.50 ≤0.70 ≤0.05 0.0005-0.006 ≥0.015

Mechanical Properties

Grade Thickness Tensile (MPa) Elongation % Impact (J) Hardness HBW
NM550 ≤70mm By agreement By agreement — 520~580
NM550D ≤70mm By agreement By agreement By agreement @ -20°C 520~580
NM550E ≤70mm By agreement By agreement By agreement @ -40°C 520~580
NM550 (optional) 70~100mm By agreement By agreement — 500~580
Note: Tensile, elongation and impact properties for NM550/NM550D/NM550E shall be agreed upon between supplier and buyer according to GB/T 24186-2022. Brinell hardness is guaranteed.
Delivery: Quenched; Quenched + Tempered; TMCP + Tempered; or Hot Rolled (as agreed).

Technical FAQ

Welding methods?

SMAW, GMAW, FCAW. Preheat 200-250°C for thickness >20mm, low hydrogen practices. Consult welding procedure.

Bending?

Not recommended for tight bends due to high hardness. Contact for technical advice.

Cutting methods?

Plasma, waterjet, abrasive cutting. Laser cutting with preheating required.

Hardness uniformity?

≤40mm uniform, 40-70mm slight core decrease within tolerance.

Max service temp?

Continuous ≤200°C, short peaks ≤250°C. Higher temps reduce hardness.

Impact properties?

D/E grade impact values by agreement. Consult supplier for specific requirements.

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MOQ: 5 tons
Stock: 30-35 days
Mill: 35-40 days