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AISI 4340
Conditions Tensile Properties 
T (°C)Treatment
25 annealed at 810°C   Tensile Strength (MPa) 744.6 
Yield Strength (MPa) 472.3 
Elongation (%) 22.0 
Reduction in Area (%) 49.9 
25 normalized at 870°C   Tensile Strength (MPa) 1279.0 
Yield Strength (MPa) 861.8 
Elongation (%) 12.2 
Reduction in Area (%) 36.3 
25 oil quenched, fine grained, tempered at 205°C   Tensile Strength (MPa) 1875 
Yield Strength (MPa) 1675 
Elongation (%) 10 
Reduction in Area (%) 38 
25 oil quenched, fine grained, tempered at 315°C   Tensile Strength (MPa) 1724 
Yield Strength (MPa) 1586 
Elongation (%) 10 
Reduction in Area (%) 40 
25 oil quenched, fine grained, tempered at 425°C   Tensile Strength (MPa) 1469 
Yield Strength (MPa) 1365 
Elongation (%) 10 
Reduction in Area (%) 44 
25 oil quenched, fine grained, tempered at 540°C   Tensile Strength (MPa) 1172 
Yield Strength (MPa) 1076 
Elongation (%) 13 
Reduction in Area (%) 51 
25 oil quenched, fine grained, tempered at 650°C   Tensile Strength (MPa) 965 
Yield Strength (MPa) 855 
Elongation (%) 19 
Reduction in Area (%) 60 
Glossary
Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.