The forging process of ultra fine grained steel of the present invention comprises the ultra fine grained steel including as a main component, and consisting of, in wt%: C: 0.45-0.55; Si: 0.05-0.15, Mn: 0.2-0.5; B: 0.005-0.025; Nb: 0.02-0.07; and Al: 0.01-0.05. The forging process of the ultra fine grained steel includes a step for processing the ultra fine grained steel into ingots with fixed shapes and sizes; a forming step for first forming the ingots; a forming step for second forming the first formed ingots at temperatures predetermined over the predetermined reference temperatures by using a forging process; and a step for improving the hardenability of the ingots by heat-treating the ingots processed in the forging process. The present invention of the configuration is capable of deleting annealing processes implemented between forging processes; and, therefore provides the effect which is capable not only of reducing production costs and hours, but also of preventing environmental contamination by preventing toxic substances from being generated in the annealing process. [Reference numerals] (AA) Applying high formability material, Spheroidizing annealing unnecessary;(BB) Secondly inject within 3 seconds after 200 heat generation in first try (Maintain over 150 );(CC) Thirdly inject within 5 seconds after 200 heat generation in second try (Maintain over 150 );(DD) Normalizing;(EE) Processing/high frequency
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