Manufacturing method of steel for engine cracking connecting rod as well as method for manufacturing forge piece by steel

The invention discloses a manufacturing method of steel for an engine cracking connecting rod as well as a method for manufacturing a forge piece by the steel. The manufacturing method of the steel for the engine cracking connecting rod comprises the steps of performing open rolling, performing intensive pressure water cooling, performing precision rolling, performing intensive pressure water cooling and performing final rolling; and non-quenched and tempered steel is rolled into a rod material of phi 50 to phi 70. The method for manufacturing the forge piece by the steel for the engine cracking connecting rod comprises the steps of blanking, performing induction heating, performing roll forging, blowing, performing forging forming, performing punching and trimming, shaping and performingcontrolled cooling, wherein the induction heating temperature is 1260 to 1280 DEG C, the roll forging temperature is 1220 to 1250 DEG C and the forging forming temperature is 950 to 1000 DEG C. The connecting rod effectively