16Mn isLow-alloy high-strength structural steelCarbon content ranges from 0.1% to 0.25%, with major alloying elements such as manganese, silicon, vanadium, niobium, and titanium added; the total alloy content is less than 3%. It is categorized into four strength levels: 300, 350, 400, and 450 MPa. The main grades are Q295, Q345, Q390, Q420, and Q460. "Q" is the uppercase Pinyin initial of the Chinese character for "yield," followed by the number indicating the yield strength value (σs) of the grade. The subsequent symbol divides the steel into grades A, B, C, and D based on the descending content of impurities (sulfur, phosphorus) and the varying carbon-manganese content. Grades A and B are commonly referred to as 16Mn.