ASTM A829-4140 Quenched & Tempered Steel Plate

ASTM A829 Grade 4140 steel plate is a versatile, high-strength alloy known for its excellent wear resistance and toughness. Comprising chromium and molybdenum, this medium-carbon steel offers enhanced hardenability and strength, making it suitable for various industrial applications. It is available in multiple heat treatment conditions, including as-rolled, annealed, normalized, and quenched & tempered. Mill test reports accompany each order, ensuring quality and compliance.

🔍 Product Overview

ASTM A829 Grade 4140 steel plate is a versatile, high-strength alloy known for its excellent wear resistance and toughness. Comprising chromium and molybdenum, this medium-carbon steel offers enhanced hardenability and strength, making it suitable for various industrial applications. It is available in multiple heat treatment conditions, including as-rolled, annealed, normalized, and quenched & tempered. Mill test reports accompany each order, ensuring quality and compliance.


📊 Technical Specifications

Property Value
Standard ASTM A829
Grade 4140
Thickness Range 1/4″ – 6″ (6.35mm – 152.4mm)
Width Range 36″ – 96″ (914mm – 2438mm)
Length Range Up to 240″ (6096mm)
Heat Treatment Options As-rolled, Annealed, Normalized, Quenched & Tempered
Yield Strength ≥ 620 MPa (90 ksi)
Tensile Strength ≥ 825 MPa (120 ksi)
Elongation ≥ 15%
Hardness (Brinell) 207 – 285 HB

🧪 Chemical Composition

Element Composition (%)
Carbon (C) 0.36 – 0.44
Manganese (Mn) 0.75 – 1.00
Phosphorus (P) ≤ 0.030
Sulfur (S) ≤ 0.040
Silicon (Si) 0.15 – 0.35
Chromium (Cr) 0.80 – 1.10
Molybdenum (Mo) 0.15 – 0.25

⚖️ Comparative Analysis: ASTM A829 4140 vs. ASTM A514

Feature ASTM A829 4140 ASTM A514
Composition Cr-Mo Alloy High-Yield Alloy
Yield Strength ≥ 620 MPa (90 ksi) ≥ 690 MPa (100 ksi)
Tensile Strength ≥ 825 MPa (120 ksi) ≥ 760 MPa (110 ksi)
Hardness (Brinell) 207 – 285 HB 235 – 293 HB
Formability Good Moderate
Weldability Requires Pre/Post-Heat Treatment Good
Applications Machinery, Shafts, Gears Structural Components, Bridges

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