A516 Carbon Steels

The improvement in CVN toughness realized by Q&T is demonstrated in Figure 5.

In general, a PWHT cycle of 1150 degrees F for eight hours will create the need for an additional three points of CE to achieve the same strength as in a plate of the same thickness without PWHT. The effect of PWHT on lowering strength levels is shown in Figure 6.* Figures 7 and 8 further summarize the results of  testing on a one inch thick A516 Grade 70 plate and show the degradation of toughness as PWHT severity increases.

We will consider multiple certification of A516 to Grades 60, 65 and 70 on normalized plates from 3/8- to 3-inches thick. The necessary chemistry controls can be achieved in our ladle metallurgy facilities.