METHOD OF PREPARING NON-QUENCHED AND TEMPERED STEEL AND METHOD OF PREPARING FINE-GRAIN FORGED PIECE BY USING NON-QUENCHED AND TEMPERED STEEL

摘要

A method of preparing a non-quenched and tempered steel, wherein a bar is subjected to initial rolling, water cooling, precision rolling, water cooling and finish rolling, the rolling heating temperature is 1150-1200°C, the initial rolling temperature is 1110-1160°C, the precision rolling temperature is 860-900°C, and the finish rolling temperature is 830-860°C. A method of preparing a fine-grain forged piece by using a non-quenched and tempered steel, comprising the steps of blanking, induction heating, roll forging, air blowing, forging and forming, punching and edge cutting, shaping, and controlled cooling, wherein the induction heating temperature is 1260-1280°C, the roll forging temperature is 1220-1250°C, and the forging and forming temperature is 1050-1100°C. The method of preparing a forged piece by using a non-quenched and tempered steel effectively reduces the grain size, improves the material strength and toughness, and simplifies the production technology.