Alloy 4340 in Plate
SPECIFICATIONS: AISI4340, ASTM A 829 / A6 SAE J404, AMS 2252/ 2301/6359 SAE J404
Castle Metals stocks Alloy 4340 plate through our global distribution network. Our service centers are located throughout the U.S., Canada, Mexico, U.K, France, Singapore, and Shanghai. Customers calling us for 4340 plate a lot of times are frustrated with on-time delivery issues. Castle Metals understands the pressures you face, and between material, processing, and technology solutions, we typically are able to take a lot of the hassle out of your supply chain.
Alloy 4340 plate is another general purpose grade of steel used for industrial and machining applications. The inclusion of Nickel in Alloy 4340 helps simplify heat treatment. In addition, the Nickel in Alloy 4340 increases hardenability of the steel.
An additional grade of Alloy 4340 is Alloy E-4340. E-4340 is critical for parts in aerospace and other industries where great strength is needed. The annealing of Alloy E-4340 characterizes the grade as containing excellent impact and strength properties with good ductility.
Plate Properties
Grade 4340 Properties
GRADE |
Thickness |
Temper & Condition |
Specifications |
Tensile KSI |
Yield KSI |
% Elong. Min | |
8" | 2" | ||||||
AISI 4340 |
3/8" thru 8-1/8" |
Stress Relieved | ASTM A 829 / A6 SAE J404 | - | - | - | - |
Annealed | ASTM A6AMS 2252/ 2301/6359 |
Chemistry(range or Maximum in %)
Chemistry (range or Maximum in %)
Grade | Thickness | C |
Mn | P |
S |
Si |
Ni |
Cr |
Mo |
AISI 4340 |
3/8" thru 8-1/8" | .36/.44 | .55/.80 | 0.035 | 0.04 | .15/.40 | 1.65/2.00 | .60/.90 | .20/.30 |