... , all kinds of quality checking Equipments.2. Now a series of strict quality control process and manufacture process have been established ... has been carried out during the whole process of manufacture with the assistance of computer and other material control equipments, which ... 4140, 4330, 4620, 52100, 6120, 6150, 8620Stainless steels & Heat resisting steels 303, 304, 309, 314, 316,316L, 410, 420 ...