Tianjin Yuantai Derun Group's sikuea ma rectangular uelo paipa uamea na tuuina atu AAAAA oloa tusi faamaonia e le Inisetiute o Metallurgical Alamanuia Fuafuaga.

E tusa ai ma manaoga faapitoa o le "mautinoa" mo paipa uelo sikuea ma rectangular mo faamoemoega fausaga, sikuea ma rectangular uʻamea paipa mo faamoemoega fausaga lautele, o le tulaga comprehensively manatu le tulaga tutusa lelei, tali lelei, tusi faamaonia oloa, taui mamalu i le tulaga o oloa. , tulaga lelei faʻamautinoaga i le atinaʻe tulaga, tomai faʻafouina, faʻamaoni atinaʻe, tulaga tautua, tulaga faʻamatalaga ma isi mea.Fa'atotonugalemu i luga o le fa'asalalauina o le gafatia fa'amautinoaga lelei o oloa tau pisinisi ma le tau fa'ailoga oloa, atina'e fa'asaienisi, talafeagai, fa'ata'ita'iga fa'ata'ita'iga fa'atatau, tu'uina atu le fa'avae mo le isi laasaga o le fa'atulagaina o le fa'amoemoega o paipa fa'apipi'iina, fa'amautu le fa'amoemoega lautele malulu fa'afefe po'o vevela fa'afefete fa'afefe. fa'ailoga fa'ailoga, fa'ato'a ma fau oloa u'amea "fa'ailoga mautinoa".