Metal Alloys
Alloy Home
Steels
Alloy Steels
General Information
Properties
Classification
Standard
H-Steels
HSLA
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
Resources
Bibliography
3D Scanners

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

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Mechanical Engineers Outlook

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

Selecting the Right 3D Printer

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

more free publications
 
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
3D Scanners

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

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Mechanical Engineers Outlook

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

Selecting the Right 3D Printer

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