Super high strength magnet yoke steel and manufacturing method thereof

The invention discloses super high strength magnet yoke steel. The super high strength magnet yoke steel comprises, by weight percentage, 0.10-0.15% of C, smaller than or equal to 0.15% of Si, 1.85-2.00% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.010% of S, 0.20-0.30% of Ti, 0.05-0.07% of Nb, 0.35-0.55% of Mo, 0.001-0.003% of B, 0.02-0.10% of Als, smaller than or equalto 0.010% of N and the balance Fe and inevitable impurities. According to the super high strength magnet yoke steel, in order to further improve strength and effectively break through the extreme strength 700 MPa of steel of a ferritic structure, in a structure reinforcing manner, by adding a proper amount of bainite to form elements, in cooperation with a super fast cooling process, a bainite structure is obtained, and the super high strength magnet yoke steel is obtained. 本发明公开了种超高强度磁轭钢，其化学成份按重量百分数计为C：0.10～0.15，Si：≤0.15，Mn：1.85～2.00，P：≤0.015，S：≤0.010，Ti：0.20～0.30，Nb：0.05～0.07，Mo：0.35～0.55，B：0.001～0.003，Als：0.02～0.1