Is NM500 always better than NM400?

No — NM500 wins in pure sliding abrasion but cracks more easily under impact and heavy forming. Many fleets use NM500 for floors/liners and NM400 for formed parts.

Grades · Wear-Resistant Plate · NM500

NM500

Data under review

NM500 is the 500 HBW abrasion-resistant plate for severe wear: roughly double the service life of NM400 in sliding abrasion, at higher forming and welding demands.

Hardness470–540 HBW

DIN— (cf. XAR500 class)

AISIAR500 class

GBNM500 (GB/T 24186)

CategoryWear-Resistant Plate

Chemical composition

Element	Content (%)
C	≤0.30 (typ.)
Si	≤0.70
Mn	≤1.60
P	≤0.025
S	≤0.010
Cr	≤1.50
Ni	≤1.00 (typ.)
Mo	≤0.65
B	≤0.004

Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.

Properties

Hardness	470–540 HBW
Tensile strength	≥1450 MPa (typ.)
Density	7.85 g/cm³

Heat treatment

Delivered quenched/tempered; avoid service or post-weld heating above ~200–250 °C.

Equivalent grades

Standard	Designation
din	— (cf. XAR500 class)
aisi	AR500 class
gb	NM500 (GB/T 24186)

Compare side by side: NM500 vs NM400

Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.

Applications & Processing

Applications: High-wear buckets and liners, shredder parts, mining truck beds, cement and aggregate equipment.

Processing: Forming radii ≥4–6× thickness; preheat for welding (100–200 °C by thickness); waterjet/plasma cutting preferred.

FAQ

Is NM500 always better than NM400?: No — NM500 wins in pure sliding abrasion but cracks more easily under impact and heavy forming. Many fleets use NM500 for floors/liners and NM400 for formed parts.

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Source: GB/T 24186 published ranges (mill-dependent) · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.