An kafa ƙungiyar ƙarfe ta Tianjin Rainbow a shekara ta 2000, wacce ke birnin Tianjin. Bayan shekaru 20 da suka gabata, Rainbow Steel ya zama kamfani na ƙarfe da ƙarfe da aka haɗa da galvanized.Bututun Karfe, galvanizedMala'ikan Karfesandar, bayanan martaba na galvanized, babban galvanizedTsarin Karfedon gini. Ƙungiyarmu tana da fasahar kera kayayyaki, gogewar sarrafawa, ƙwarewar injiniyanci da kayan aiki na zamani. Mutanenmu suna da hankali da aiki tuƙuru. Kayayyakinmu sun haɗa da manyan gine-ginen ƙarfe don gini, wuraren zirga-zirgar ababen hawa, sandar tsarin ƙarfe mai sauri, kayan haɗin ƙarfe na jirgin ƙasa ko tsarin ƙarfe, tsarin hawa hasken rana, da sauran manyan ayyuka na tsarin ƙarfe. Ana amfani da bututun ƙarfe mai fenti don watsa ruwa ko wasu ruwa a ƙarƙashin ƙasa. Diamita na masana'anta yana daga 219mm zuwa 1016mm. Haɗin yana da ƙarshen yanke ko haɗin flange. Ana iya amfani da murfin epoxy na ciki don watsa ruwan rai kuma ba shi da guba.