ASME SA633 Gr. D low alloy steel plate latest standard change Mn content regulation

ASME SA633 Gr. D  low alloy steel plate are widely used in buildings, bridges, ships, pressure vessels, vehicles, special equipment and other fields.

The yield strength of ASME SA633 Gr. D low alloy steel plate decreases with the increase of SA633 Gr. D steel thickness. In the previous standard version, the manganese content of ASME SA633 Gr.D steel plate is 1.0-1.60, and the latest standard has changed the value less than or equal to 1.70, removing the lowest limit. This is the most obvious change in ASME's latest "low alloy high strength structural steel" standard.

With the discovery of modern industry and the continuous progress of science and technology, the application of various trace elements in steel plate is more and more extensive. Manganese content is no longer the only factor that affects the strength and mechanical properties of ASME SA633 Gr. D  low alloy steel plate. Therefore, the latest high strength low alloy structural steel standard no longer stipulates the content range of Mn, only the maximum value.