Erw chitoliro chopangira makina, fakitale yopanga machubu a erw-ZTZG

ZTZG ndiye kampani yayikulu kwambiri yopanga zinthuMPHIRI YA PIPE YA ERWmakina ku China, omwe ali ndi maziko ake a R&D, processing, ndi production. Idakhazikitsidwa mu 2000,ZTZG yakhalapo kwa zaka 25. Zogulitsa zake ndi zokhazikika, zodalirika, zatsopano, komanso zapamwamba kwambiri, zomwe zimakupatsani mwayi wosunga ndalama zambiri zogwirira ntchito ndikuwonjezera magwiridwe antchito.