Qingdao Kehua Petroleum Machinery Co.,LTD
petroleum machinery, mud pump, spare parts, mud pump parts, drilling rig parts, Manufacturer and Supplier - China(CN)
High Frequency Quenching Liners (20090705)
Hardened steel liners are made with premium seamless steel tube of Premium forged steel , in which the bore is carburized and quenched ,creating a hardened layer with hardness of 58 to 62 Rockwell C scales.