shank adapter

The 20CrNi3 shank adapter for hydraulic rock drill was fractured after drilling for 300 meters．The fracture causes of 20CrNi3 shank adapter were analyzed through chemical composition analysis，fracture morphology and microstructure observation，mechanical properties testing． The results showed

After testing the material, hardness, effective hardening layer thickness and metallurgical structure of the failed shank adapter on YGZ90 rock drill, it’s found that all indicators and parameters meet the quality requirements for the heat treatment. Based on the analysis of usage of the shank