1.Raw Material: 20 Crmo 2.Equipment: DOOSAN Maching Center 3.Heatment:Cemented Quenching 4.Hardening Layer:1.5-2 mm Yantai Xinren Mechanical & Electrical Equipment Co.,Ltd established in 2009 is one of the largest manufacturer of Hydraulic Breakers and attachments .Our main products including DBK Series Hydraulic Breaker,Front Cylinder,Rear Cylinder,Middle Cylinder,Piston,Inner Bushing,Outer ...