Steel used for percussive rock drill rod has strict requirements for chemical composition and heat treatment of raw materials due to its use in broken rocks.Based on the macroscopic analysis,chemical composition,macro,metallography and hardness test of 3 different kinds of defects and normal samples to be quenched after normalization,the stress cracks caused by improper heat treatment are determined.
关键词
钎杆钢/42CrMoA/淬火开裂/金相分析
Key words
drill rod steel/42CrMoA/quenching cracking/metallographic analysis