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 Mn-Si-B series of micro-alloyed bainitic steel, forged air-cooled bainite or bainite / martensite, carbides and a small amount of retained austenite Organization.Adding trace elements, austenite grain and microstructure refinement, the formation of high hardness carbide dispersion distribution, improve the hardness, toughness and wear resistance.After the yuan, binary and ternary microalloying metamorphism, Steel in turn followed by thinning, hardness, toughness and wear resistance gradually increased.Ultra-micro-alloying treatment of high-carbon bainitic steel, the organization is more small and uniform, the performance is more superior.