When is NM450 the right pick over NM500?

When the part must be formed or sees moderate impact on top of abrasion: NM450 keeps most of NM500’s wear life with noticeably better cracking resistance in bends and welds.

Grades · Wear-Resistant Plate · NM450

NM450

Data under review

NM450 sits between NM400 and NM500 in the GB/T 24186 family: a 450 HBW class plate for severe sliding abrasion that still keeps usable bendability, where NM500 would already demand generous forming radii.

Hardness420–480 HBW

DIN— (cf. XAR450 class)

AISIAR450 class

GBNM450 (GB/T 24186)

CategoryWear-Resistant Plate

Chemical composition

Element	Content (%)
C	≤0.25
Si	≤0.70
Mn	≤1.60
P	≤0.025
S	≤0.010
Cr	≤1.50
Ni	≤1.00
Mo	≤0.60
B	≤0.004

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

Properties

Hardness	420–480 HBW
Tensile strength	≥1250 MPa (typ.)
Impact	≥24 J at −20 °C (typ. spec)
Density	7.85 g/cm³

Heat treatment

Delivered quenched or quench-tempered — do NOT re-heat above ~250 °C in service or processing.

Equivalent grades

Standard	Designation
din	— (cf. XAR450 class)
aisi	AR450 class
gb	NM450 (GB/T 24186)

Compare side by side: NM450 vs NM400 · NM450 vs NM500

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

Applications & Processing

Applications: Excavator and loader buckets, crusher and shredder liners, dump bodies in hard-rock service, wear strips.

Processing: Bend with radii ≥3–4× thickness; preheat 100–150 °C for thick-plate welding; waterjet or plasma cutting preferred over flame for edge quality.

FAQ

When is NM450 the right pick over NM500?: When the part must be formed or sees moderate impact on top of abrasion: NM450 keeps most of NM500’s wear life with noticeably better cracking resistance in bends and welds.

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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.