Thép chế tạo cơ khí : SCM440, 42CrMo4, 4140, S10C, S17C, S20C, S25C, S30C, S35C, S38C, S40C, S45C, S50C, S55C, S58C, SAE1050, SAE1055, SCM415, SCM420, SCM435, SCr420, Q345B, A572Gr.50….