Alloy 2124-T851 plate was developed primarily for elevated temperature applications requiring guaranteed fracture toughness and improved short transverse properties in plate gauges over 1.0 inches (25.40 mm) thick. This plate alloy also exhibits good strength retention and creep resistance at elevated temperatures up to 350° F (177°C). Fracture toughness levels of 2124-T851 plate are substantially higher than 2024-T851.
Alloy 2124-T851 plate is available in thicknesses from 1.50 inch (38.1 mm) through 6.00 inches (152.4 mm) with guaranteed minimum fracture toughness.

Through the application of statistical process control techniques recently implemented at Alcoa’s Davenport, Iowa plant, additional quality improvements have been made to thick gauges of alloy 2124 plate. As a result Alcoa will guarantee strength improvements of 2 to 3 ksi, elongation improvements of 1 to 3 percent for the L and LT direction and 0.5 percent for the ST direction over mechanical properties shown in this fact sheet. Fracture toughness improvements of 1 to 3 ksi√in will be guaranteed on request. As with all Alcoa thick plate products Class A ultrasonic quality will also be guaranteed.

The fatigue properties of alloy 2124-T851 are similar to those of 2024-T851.



Alloy 2124-T851 resistance to atmospheric corrosion is comparable to that of conventionally fabricated 2024-T851.
Tests conducted on numerous lots of 2124-T851 show good resistance to stress corrosion cracking, particularly in the short-transverse direction. In 20 years of service there are no reported incidents of SCC failures.
Alloy 2124-T851 has excellent exfoliation corrosion resistance.