轧辊材料（Roll material）.docVIP

轧辊材料（Roll material） The service life of roll material and heat treatment process mainly depends on the internal performance and work force of the roller, and its intrinsic performance includes strength and hardness. The roller has enough strength, mainly from the roll material considerations; hardness usually refers to the work roll surface hardness, it determines the roll wear resistance, to a certain extent also determines the service life of the roller, the material selection and reasonable heat treatment can meet the requirements of the roll hardness. The traditional roll material selection and heat treatment process are summarized, and the development of roll material and its heat treatment process is prospected. Traditional cold roll materials and their heat treatment methods Cold roll in the work process to bear great pressure and rolling, rolling, weld inclusions, edge crack problems, easily lead to instantaneous high temperature, the thermal shock caused by the strong work roll, roll sticking and spalling crack and scrap. Therefore, the cold roll has the ability to resist cracking and spalling due to bending, torsion and shear stress, as well as high wear resistance, contact fatigue strength, fracture toughness and thermal impact strength. Outside the cold working roll general domestic use materials such as GCr15, 9Cr2, 9Cr, 9CrV, 9Cr2W, 9Cr2Mo, 60CrMoV, 80CrNi3W, 8CrMoV, 86CrMoV7, Mo3A etc.. In the twentieth Century 50~60, the rolled pieces were mostly carbon structural steel, the strength and hardness were not high, so the roller generally used 1.5% ~ 2%Cr forged steel. The final heat treatment of this kind of steel usually adopts quenching and low temperature tempering. The common quenching methods are induction surface hardening and integral heating quenching. The main task is to consider how to improve the abrasion resistance and spalling resistance of the roll, and to improve the depth of the hardened layer, so as to ensure the uniformity of the surfa