Metal Alloys
Alloy Home
Alloy Steels
General Information
Alloy Steel List
AISI 1xxx
AISI 2xxx
AISI 3xxx
AISI 4xxx
AISI 5xxx
AISI 6xxx
AISI 8xxx
AISI 9xxx
* For other AISI or Non-AISI, please use the search function above or check Grades.
ASTM Steels
Specific Alloy Steel
General Information
Further Details
Wind Systems

Towers, turbines, gearboxes; processes for shaping and finishing component parts.


International news and technology for marine/offshore operations around the world.

Essentials of Manufacturing

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

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

more free magazines
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