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NM400 Abrasion Resistant Steel Plate

370~430 HBW Quenched & Tempered Heavy Duty Wear Applications

Surface Hardness: 370 ~ 430 HBW

Chinese NM400 high strength abrasion resistant steel plate — engineered for extreme wear conditions in mining, construction, and heavy machinery. Meets GB/T 24186-2022 standard.

Extended Service Life

370-430 HBW hardness delivers exceptional wear resistance, 5-7x longer life than structural steel.

High Strength & Toughness

Tensile strength ≥1200 MPa, impact toughness -20°C ≥24J (D grade).

Good Workability

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

Decoding the Grade: NM400

N 耐磨 – Wear / Abrasion resistant

M 磨 – Abrasion reinforced

400 Typical Brinell Hardness (HBW)

International Standards & Comparisons

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China (GB/T 24186)

NM400 / NM400D/E

Chemical Composition (wt%, max unless range):
C ≤0.30, Si ≤0.70, Mn ≤1.60, P ≤0.025, S ≤0.010,
Cr ≤1.20, Ni ≤0.70, Mo ≤0.50, Ti ≤0.05, B 0.0005-0.006, Als ≥0.010

Hardness: 370~430 HBW (≤80mm)

Tensile: ≥1200 MPa

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USA (ASTM / AR Standard)

AR400 / AR400F

Typical Composition (wt%):
C 0.18-0.26, Si 0.20-0.60, Mn 0.70-1.60, P ≤0.025, S ≤0.010,
Cr 0.50-1.20, Ni ≤0.80, Mo 0.20-0.50, B 0.0005-0.005

Hardness: 360~440 HBW

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Germany (DILLINGER)

XAR® 400 / XAR 400

Typical Composition (wt%):
C ≤0.22, Si ≤0.55, Mn ≤1.60, P ≤0.020, S ≤0.010,
Cr ≤1.2, Ni ≤0.8, Mo ≤0.3, B ≤0.004

Hardness: 360~440 HBW

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Sweden (SSAB)

Hardox® 400

Typical Composition (wt%):
C 0.20-0.25, Si ≤0.70, Mn ≤1.60, P ≤0.025, S ≤0.010,
Cr ≤1.2, Ni ≤0.8, Mo ≤0.3, B ≤0.004

Hardness: 370~430 HBW

Note: NM400 provides an excellent balance of hardness, toughness and weldability for heavy wear applications. AR400/XAR400/Hardox400 are approximate commercial equivalents.

Domestic Grade Comparison (NM400 / NM400D / NM400E)

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NM400 (Standard)

Base Grade / General Wear Applications

Chemical Composition (wt%, max):
C ≤0.30, Si ≤0.70, Mn ≤1.60, P ≤0.025, S ≤0.010,
Cr ≤1.20, Ni ≤0.70, Mo ≤0.50, Ti ≤0.05, B 0.0005-0.006

Hardness: 370~430 HBW
Tensile: ≥1200 MPa
Impact: Not guaranteed (by agreement)

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NM400D (Low Temperature)

D Grade / -20°C Impact Toughness

Chemical Composition (wt%, max):
C ≤0.25, Si ≤0.70, Mn ≤1.60, P ≤0.020, S ≤0.005,
Cr ≤1.20, Ni ≤0.70, Mo ≤0.60, Ti ≤0.05, B 0.0005-0.006, Als ≥0.015

Hardness: 370~430 HBW
Tensile: ≥1200 MPa
Impact: ≥24J @ -20°C (Longitudinal)
CEV ≤0.57 (≤50mm) / ≤0.67 (>50mm)

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NM400E (Extra Low Temperature)

E Grade / -40°C Impact Toughness

Chemical Composition (wt%, max):
C ≤0.25, Si ≤0.70, Mn ≤1.60, P ≤0.020, S ≤0.005,
Cr ≤1.20, Ni ≤0.70, Mo ≤0.60, Ti ≤0.05, B 0.0005-0.006, Als ≥0.015

Hardness: 370~430 HBW
Tensile: ≥1200 MPa
Impact: ≥24J @ -40°C (Longitudinal)
CEV ≤0.57 (≤50mm) / ≤0.67 (>50mm)

According to GB/T 24186-2022, NM400D and NM400E are low-temperature impact grades. D grade guarantees impact toughness ≥24J at -20°C, E grade guarantees ≥24J at -40°C.

Why Choose NM400 Wear Plate?

Superior Durability

Optimized low-carbon design with micro-alloying ensures exceptional abrasion resistance.

High Impact Toughness

≥24J at -20°C (D grade) or -40°C (E grade), ideal for cold climates.

Good Fabrication

Cutting, bending, drilling and welding with proper procedures and preheating.

Typical Applications

Mining & Quarrying

Dump truck bodies, chutes, hoppers, crusher liners

Construction Equipment

Excavator buckets, loader buckets, bulldozer blades, backhoe buckets

Heavy Transport

Tipper truck bodies, dump truck liners, trailer floors, railcar linings

Material Handling

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

Customization Services

Cut-to-size / Precision cutting

Plasma / Laser / Waterjet cutting

Bending / Forming / Drilling

Surface treatment / Painting

Heat treatment (quenching & tempering)

Third-party inspection (SGS, BV)

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 - 80	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
NM400 (max)	≤0.30	≤0.70	≤1.60	≤0.025	≤0.010	≤1.20	≤0.70	≤0.50	≤0.05	0.0005-0.006	≥0.010
NM400D/E (max)	≤0.25	≤0.70	≤1.60	≤0.020	≤0.005	≤1.20	≤0.70	≤0.60	≤0.05	0.0005-0.006	≥0.015

Mechanical Properties

Grade	Thickness	Tensile (MPa)	Elongation %	Impact (J)	Hardness HBW
NM400	≤80mm	≥1200	≥10	—	370~430
NM400D/E	≤80mm	≥1200	≥10	≥24J (D:-20°C / E:-40°C)	370~430
NM400 (optional)	80~120mm	≥1100	≥9	≥21	360~440
Note: Tensile, elongation and impact are special requirements per GB/T 24186. For standard NM400, Brinell hardness is guaranteed.

Delivery: Quenched; Quenched + Tempered; TMCP + Tempered; or Hot Rolled (as agreed).

Technical FAQ

Welding methods?

SMAW, GMAW, FCAW. Preheat 150-200°C for thickness >20mm, low hydrogen practices.

Bending radius?

Transverse: 5t-6t, Longitudinal: 6t-7t.

Cutting methods?

Plasma, laser (≤20mm), waterjet, abrasive cutting. Preheating recommended.

Hardness uniformity?

≤40mm uniform, 40-80mm slight core decrease within tolerance.

Max service temp?

Continuous ≤250°C, short peaks ≤300°C.

Impact at low temp?

D grade: ≥24J @ -20°C; E grade: ≥24J @ -40°C.

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