Product Feature Characteristics: high hardness, good wear resistance, no breakage, no deformation, good quality, reasonable price Product Specification/Models Diameter:8,10,12,14,16,18,20,20*25,25*30,30*35,35*40 (mm) Chemical composition: Item:ZQCr2 C(2.2-3.5%),Si(0.3-1.4%),Mn(0.2-1.5%), Cr(0.3-3%) Properties and microstructure: Hardness(a minimum surface hardness of 46 HRC),Microstructure:P+C ...