A829 - 4140

ASTM A829-4140 Quenched & Tempered Steel Plate

Leeco® Steel stocks and supplies ASTM A829 steel plate, which offers greater wear resistance than lower grades of structural steel plate.


  • Versatile structural quality steel plate that offers greater wear resistance than lower carbon grades of steel.
  • Available in grade 4140 in both standard (under 3-inches) and heavy (3-inches or greater) plate thicknesses.
  • Supplied in as rolled condition, but less common conditions - annealed, normalized and normalized and tempered - can be special-ordered.
  • Quenched and tempered for increased through-hardening.
  • Mill test reports are supplied with each order.


Available Sizes

Leeco Steel stocks the following standard sizes, but other sizes may be available for special orders.

Heat Treated 1/4" – 6" 36" – 96" Up to 240"
As Rolled 1/4" – 6" 36" – 96" Up to 240"

Minimum order weight in the USA is 20 tons. For orders weighing less than 20 tons, additional freight surcharges may be applied. Minimum order weight for orders outside of North America is 500 MT.

Chemical Composition

The following composition properties are ASTM specifications for A829 GR 4140.

Carbon 0.36-0.44%
Manganese 0.75-1.00%
Phosphorus max 0.030%
Sulfur max 0.040%
Silicon 0.15-0.35%
Chromium 0.80-1.10%
Molybdenum 0.15-0.25%