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"

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%