The primary alloying elements in steel, except for a few microalloying elements, are generally indicated as a percentage. When the average alloy content is less than 1.5%, the steel grade typically only lists the element symbol without specifying the content. However, in special cases where confusion may arise, a number "1" can also be appended after the element symbol, e.g., in the steel grades "12CrMoV" and "12Cr1MoV," the former contains 0.4-0.6% chromium, while the latter contains 0.9-1.2%, with all other components being identical.