Is AR400 an ASTM specification?

No. A514/A829 do not define an “AR400” grade — it is a market hardness class supplied to mill datasheets. The comparable standardized grades are GB NM400 and the European 400-class brands (Hardox 400, XAR400).

Grades · Wear-Resistant Plate · AR400

AR400

Data under review

AR400 is the North American trade designation for 400-class abrasion-resistant plate — a hardness class (roughly 360–440 HBW), not a single ASTM grade. Chemistry is set by each mill to hit the hardness, so the composition shown is typical published mill chemistry, not a standard-controlled range; always order to guaranteed hardness and check the MTC.

Hardness360–440 HBW

DIN— (cf. XAR400 class)

AISIAR400 class

GBNM400 (GB/T 24186, comparable class)

CategoryWear-Resistant Plate

Chemical composition

Element	Content (%)
C	≤0.30
Si	≤0.70
Mn	≤1.60
P	≤0.025
S	≤0.015
Cr	≤1.00
Mo	≤0.50
B	≤0.004

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

Properties

Hardness	360–440 HBW
Tensile strength	≥1200 MPa (typ.)
Density	7.85 g/cm³

Heat treatment

Delivered quenched and tempered by the producing mill; do not stress-relieve or hot-form above ~250 °C.

Equivalent grades

Standard	Designation
din	— (cf. XAR400 class)
aisi	AR400 class
gb	NM400 (GB/T 24186, comparable class)

Compare side by side: AR400 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: Dump bodies, buckets, liners, chutes, aggregate and mining wear parts.

Processing: As NM400: plasma/laser/waterjet cutting, bending radii ≥3× thickness, low-hydrogen welding with controlled heat input.

FAQ

Is AR400 an ASTM specification?: No. A514/A829 do not define an “AR400” grade — it is a market hardness class supplied to mill datasheets. The comparable standardized grades are GB NM400 and the European 400-class brands (Hardox 400, XAR400).

Need AR400 from stock?

Steel.Wiki is sponsored by Shenzhen NewAsia Special Steel (Nasteel), a special-steel stockholder in Shenzhen stocking mold, tool and alloy steels with EN 10204 3.1 certification.

Ask for a quotation Visit Nasteel

Source: Mill AR-plate datasheets (hardness-defined class; chemistry typical, not standard-controlled) · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.