PURPOSE: To produce high quality parts made of steel without intermediate and temper heat treatments by applying high velocity hot forging to a nonheat- treated steel stock, finishing the above forging at the prescribed temp., and then forming the resulting preformed body into the prescribed shape by means of warm forging at low draft.

CONSTITUTION: High velocity hot forging is applied to a nonheat-treated steel stock to form it into a preformed body having a shape near to the prescribed shape. It is preferable that this steel stock has a composition containing, by weight, 0.3-0.6% C, 0.1-2.0% Si, 0.2-2.5% Mn, 0.005-0.1% Al, 0.005-0.3% N, and ≤0.5% V and/or Nb as essential components, also containing Cr, Ni, Mo, W, S, Pb, Bi, Te, etc., as optional additive components, and having the balance Fe with impurities. Further, the above hot forging is done at 1100-1250°C and finished at the finishing temp. where the initial crystal grain size becomes increased. By the above procedure the hardness of the preformed body can be regulated to HRC 20 to 28, and warm forging is applied to the preformed body at 600-700°C at low draft to form it into the prescribed shape. By this method, the parts made of steel free from strain can be obtained while obviating the necessity of notmalizing, quench-and-temper, etc.