What are the characteristics of SA738 Gr B steel plate

SA738 Gr B steel plate belongs to heat treatment steel plate for medium and low temperature pressure vessel. SA738 Gr B steel plate has good low-temperature impact property, high-temperature tensile property and good weldability, which is widely used in the containment and structural modules of the third generation of AP1000 and CAP1400 nuclear power plants. Delivery status of SA738 Gr B pressure vessel steel plate: quenching and tempering.

The characteristics of SA738 Gr B steel plate: the maximum thickness can reach 106mm, the minimum temperature of impact energy can reach - 45℃, and the non plastic transition temperature (NDT) can reach - 30℃.

SA738 Gr B steel plate is a low alloy high strength steel with good welding performance. However, due to the existence of Cr, Mo and other elements, if the welding process is not appropriate, there are embrittlement, thermal strain embrittlement and welding cracks in the heat affected zone of welded joint. In order to prevent welding cracks, low hydrogen electrode and preheating before welding are usually used.