Introduction to SA508 Gr22 Cl3 nuclear steel plate

Chemical composition of SA508 Gr22 Cl3 nuclear steel plate:
C≤0.25; Si 0.15 -0.40; Mn 1.2 -1.5; Mo 0.45 -0.60; Ni 0.4 -1.0; Cr≤0.25; P≤0.025; S≤0.025; Al≤0.04; V≤0.05.

SA508 Gr22 Cl3 nuclear steel plate smelting process:
For SA508-3 steel, the technology of "ladle refining+vacuum casting", namely, double vacuum smelting casting method, is widely used for smelting and casting. The main technological process is: EBT primary refining - LF refining - VD-VC, strictly control P, S, Cu, Sn, As, Sb, Co and other harmful elements by selecting the furnace charge, ensure the purity of steel, and reasonably control the steel medium/ratio.

In application, nuclear power SA508-3 steel will develop towards large size and thick wall in the future, and the new SA508-4N steel with higher toughness and hardenability will probably replace SA508-3 steel for engineering application.