... :2000, Punctual delivery Materials: H13, H13K, 5CrW2Si, 6CrW2Si, Cr12MoV,HMB,HMK etc.Jinhai company has been approved by ISO9001 Quality Management ... Province. We also have kinds of materiasl patents, like HMB, HMK, HMA. They are excellent in high intensity, high hardness, high ...