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AISI 4140
Conditions Tensile Properties 
T (°C)Treatment
25 annealed at 815°C   Tensile Strength (MPa) 655.0 
Yield Strength (MPa) 417.1 
Elongation (%) 25.7 
Reduction in Area (%) 56.9 
25 normalized at 870°C   Tensile Strength (MPa) 1020.4 
Yield Strength (MPa) 655.0 
Elongation (%) 17.7 
Reduction in Area (%) 46.8 
25 oil quenched, fine grained, tempered at 205°C   Tensile Strength (MPa) 1772 
Yield Strength (MPa) 1641 
Elongation (%)
Reduction in Area (%) 38 
25 oil quenched, fine grained, tempered at 315°C   Tensile Strength (MPa) 1551 
Yield Strength (MPa) 1434 
Elongation (%)
Reduction in Area (%) 43 
25 oil quenched, fine grained, tempered at 425°C   Tensile Strength (MPa) 1248 
Yield Strength (MPa) 1138 
Elongation (%) 13 
Reduction in Area (%) 49 
25 oil quenched, fine grained, tempered at 540°C   Tensile Strength (MPa) 951 
Yield Strength (MPa) 834 
Elongation (%) 18 
Reduction in Area (%) 58 
25 oil quenched, fine grained, tempered at 650°C   Tensile Strength (MPa) 758 
Yield Strength (MPa) 655 
Elongation (%) 22 
Reduction in Area (%) 63 
Glossary