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Grade A829 1 in. x 96 in. x 240 in. steel plate front view.
Grade A829 1 in. x 96 in. x 240 in. steel plate right view.
Grade A829 1 in. x 96 in. x 240 in. steel plate top view.

ASTM A829-4140 Alloy Structural Steel Plate

ASTM A829-4140 is a versatile alloy structural steel plate that offers greater wear resistance than lower-carbon steel grades. Leeco® Steel supplies A829-4140 in standard and heavy plate thicknesses, with multiple delivery conditions available depending on project requirements.
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Features

  • Available in both standard (under 3-inches) and heavy (3-inches or greater) plate thicknesses.

  • Stocked in the as-rolled condition.

  • Annealed, normalized, normalized and tempered, or quenched and tempered conditions may be ordered upon request.

  • Mill test reports are supplied with each order.

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Use our quote builder to configure your steel plates by selecting the material, size, thickness, quantity, and any custom requirements for fast, accurate pricing.

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Product Details

Grade Thickness Width Length
4140 As Rolled 1/4" – 6" 36" – 96" Up to 240"
4140 Heat Treated 1/4" – 6" 36" – 96" Up to 240"
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%

Grade Comparison

Frequently Asked Questions

Learn more about A829-4140 steel plate.
4140 and 1045 steel plate are both used for parts that need strength and wear performance, but they are different types of steel. ASTM A829-4140 is a chromium-molybdenum alloy steel plate with strong hardenability and heat-treating response, making it a fit for higher-stress parts that need toughness, wear resistance and deeper hardening. ASTM A830-1045 is a higher-carbon steel plate often used for gears, shafts, axles and other machine parts when hardness, strength or heat-treating potential are needed at a lower alloy level. The right choice depends on the required wear resistance, toughness, machinability, heat treatment and application requirements.
ASTM A829-4140 steel plate is used for applications that need alloy steel with more wear resistance, toughness and hardenability than lower-carbon steel grades. Common uses include machinery parts, gears, axles, brackets, tooling, dies, mold bases, heavy equipment components and other parts exposed to stress, wear or repeated loading.
In 4140 steel, the “41” generally refers to a chromium-molybdenum alloy steel, while “40” refers to the approximate carbon content. This chromium-molybdenum alloy chemistry helps give 4140 steel plate its hardenability, wear resistance and strength potential after heat treatment.
ASTM A829-4140 steel plate can be ordered in several conditions, including as-rolled, annealed, normalized, normalized and tempered, or quenched and tempered. Leeco typically stocks A829-4140 in the as-rolled condition, but heat-treated conditions may be purchased upon customer request. The delivery condition should match the machining, forming, wear and performance needs of the final application.
Yes. ASTM A829-4140 steel plate can be heat-treated to achieve different combinations of hardness, strength, toughness and wear resistance. Depending on the order requirements, A829-4140 may be supplied annealed, normalized, normalized and tempered or quenched and tempered. A829-4140 responds well to heat treatment, which is one reason it is used for machinery parts, tooling, gears, axles and other components that require stronger wear or load performance.