中碳和中高碳Mn-Si-B系多元微合金化贝氏体钢，锻后空冷可获得以贝氏体或贝氏体／马氏体为主、含碳化物和少量残留奥氏体的组织.加入微量元素，使奥氏体晶粒和显微组织细化，形成的高硬度碳化物弥散分布，提高硬度、韧性和耐磨性.通过一元、二元和三元微合金变质处理，钢的组织依次变细，硬度、韧性和耐磨性逐步提高.三元微合金化处理的中高碳贝氏体钢，组织更为细小均匀，性能更加优越.
Medium carbon and medium-high carbon air cooling micro-alloyed bainitic steels of Mn-Si-B system have been studied. The main structure is bainite or bainite/martensite after forging and air cooling, and there are carbides and a small amount of retained austenite. The structure is fine and uniform, and the addition of micro-amount elements can further refine the austenite grain and the bainitic structure.By modified treatments of mono, binary and ternary micro-alloying, the structures of various grades can be obtained, and their hardness, toughness and wear resistance increase successively. The structure of the air cooling bainitic steels with medium high carbon treated by ternary micro-alloyed after forging and tempering or nomalizing and tempering is much finer, the properties are much superior.
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