A new Mn series oil quenching super strong bainitic steel was developed on the basis of the alloy system of the original Mn series air cooling bainitic steel. The mechanical properties of the new steel are well combined while precious alloy elements and complicated technologies are not needed for its production. Experimental results show that: bainite/martensite(B/M) dual phase microstructure can be obtained within a very wide cooling rate range and bainite microstructure exists even when the cooling rate reaches as fast as 60oC/s; the hardenability of the steel is better than that of 40CrNiMo and 42CrMo; the round bar made of the steel with the diameter of 250mm, which goes through tempering at 350oC after oil quenching, exhibits its central mechanical properties as follows: σb=1550MPa, σ0.2=1270MPa, δ5=15%, aku=95J/cm2 (at room temperature).
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