ʻO Erw pipe mill, erw tube hana mīkini hale hana-ZTZG

ʻO ZTZG ka mea hana nui loaMILL PIPE ERWnā mīkini ma Kina, e kaena ana i kāna mau R&D ponoʻī, ka hana ʻana, a me nā kumu hana. Ua hoʻokumu ʻia i ka makahiki 2000,Ua noho ʻo ZTZG no 25 mau makahiki. ʻO kāna mau huahana he kūpaʻa, hilinaʻi, ʻano hou, a me ka ʻenehana, hiki iā ʻoe ke mālama i nā koina hana nui a hoʻonui i ka pono.