Is NM600 just a better NM500?

Only against sliding wear. Its impact toughness is far lower, edges chip, and forming is effectively impossible — treat it as a bolt-on liner plate, not a structural material.

Grades · Wear-Resistant Plate · NM600

NM600

Data under review

NM600 is the hardest grade in the GB/T 24186 family (570 HBW and up): maximum resistance to sliding abrasion for flat wear parts, with minimal toughness reserve. If a part must bend, absorb impact or be welded extensively, this is the wrong grade.

Hardness≥570 HBW

DIN— (cf. XAR600 class)

AISIAR600 class

GBNM600 (GB/T 24186)

CategoryWear-Resistant Plate

Chemical composition

Element	Content (%)
C	≤0.40
Si	≤0.70
Mn	≤1.60
P	≤0.025
S	≤0.010
Cr	≤1.50
Ni	≤1.00
Mo	≤0.70
B	≤0.004

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

Properties

Hardness	≥570 HBW
Tensile strength	≥1600 MPa (typ.)
Density	7.85 g/cm³

Heat treatment

Delivered quenched and tempered; never re-heat above ~200 °C — hardness is the product.

Equivalent grades

Standard	Designation
din	— (cf. XAR600 class)
aisi	AR600 class
gb	NM600 (GB/T 24186)

Compare side by side: NM600 vs NM550 · NM600 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: Extreme-abrasion liners, classifier and fan blades, wear plates in cement and aggregate plants, target and barrier plates.

Processing: Cut by waterjet or plasma; drilling/machining needs carbide and rigid setups. Welding only with strict low-hydrogen, preheat and small-bead practice — or bolt it instead.

FAQ

Is NM600 just a better NM500?: Only against sliding wear. Its impact toughness is far lower, edges chip, and forming is effectively impossible — treat it as a bolt-on liner plate, not a structural material.

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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.