Pafupifupi masiku 30 apitawo, m'modzi mwa makasitomala athu adalowaVietnamanalamula gulu lasma plates. Zinthu zake ndiASTM A572 GR.50.

Monga katswiri wopanga flanges, zovekera chitoliro, mipope ndi mankhwala ena chitoliro, Hunan Wamkulu akhoza kupanga mitundu yosiyanasiyana ya mipope. Ngati muli ndi chosowa chilichonse, chonde omasuka kulankhula nafe.