Can API602 forged steel valves be RT?

First, it’s necessary to figure out why RT is not very suitable for forgings. 1. Many defects in forgings are area-type, such as rolling cracks; these defects are perpendicular to the direction of X-ray irradiation, and thus no difference in density will be visible on the film. 2. Forged parts are often thick and large, making it difficult for ordinary X-ray machines to penetrate them. Radiography can be used for pipes, but for pipes with very thick walls, this method may not be entirely suitable. 3. Radiation is harmful to the human body; use it as little as possible. Each type of NDT has its own area of application. When choosing a testing method for pipes, forgings, and similar items, it is necessary to consider the characteristics of the defects present in those components; for volume-based defects, RT is a suitable choice ； For area defects, UT is better ； Near-surface defects on the surface of ferromagnetic materials are well detected by MT ； For surface defects in non-porous materials, PT is better ； Tubes can be ET, etc ；

Various flaw detection methods have their own advantages, disadvantages, and applicable ranges. . .

professional perspective

I’m not very familiar with this area; you can refer to the answers above. I’m also learning it*

RT is definitely possible; it’s used rarely at present because of the high cost of RT. The forgings have a good density, and local cracks can be detected using MT.