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4140

ASTM A829 Grade 4140 is a chromium-molybdenum alloy steel manufactured as vacuum-degassed steel for applications requiring high strength, toughness, wear resistance, and reliable performance under demanding conditions.
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Quote4140
Typical specification data

Technical reference

Final chemical, mechanical properties, dimensions and tolerances are confirmed against the governing specification and purchase order.

Chemical Properties
C Si Mn P S Cr Mo
0.36 - 0.44 0.15 - 0.35 0.75 - 1.00 0.02(max) 0.005(max) 0.80 - 1.10 0.15 - 0.25
Physical Properties
Delivery condition Thickness Thickness Hardness HBW Tensile Strength
annealed all all ≤ 240 800 MPa / 116 ksi
normalized ≤ 11⁄2 in ≤ 38 mm ≤ 320 1052 MPa / 152 ksi
normalized > 11⁄2 ≤ 3 in > 38 ≤ 76 mm ≤ 300 1002 MPa / 145 ksi
normalized > 3 in > 76 mm ≤ 270 900 MPa / 131 ksi
CR MO-ALLOYED VACUUM DEGASSED STEEL
AISI SAE WERKSTOFF NR. EN BS JIS ISO
4140 4140 1.7223 Type 41CrMo4 NiCr21Mo EN19A G 4105 SCM440 683/II Type 3

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