July 23rd to July 29th. Twenty-two Metallurgical Group refers to China Twenty-two Metallurgical Group. According to official website of China No.22 Metallurgical Group, after college students arrive at No.22 Metallurgical Group, the group helps new employees to take the first step of their career through centralized training, pre-job training and practical military training, which lasts for one week from July 23rd to July 29th. Training focuses on training and training. Through training, training and observation, trainees can master certain skills.