Ua hoʻokumu ʻia ʻo Tianjin Rainbow Steel Group ma 2000, aia ma Tianjin City.ʻO ka Rainbow Steel kahi hui hao a me ke kila o ka paipu kila kila, ka pahu kihi kila, nā profiles galvanized, nā hale kila galvanized no ke kūkulu ʻana i nā Infrastructure, Building Industry, Agriculture and New Energy area.Ua loaʻa i kā mākou huahana ka palapala hōʻoia o TUV, CE, ISO 9001-2008.Loaʻa nā papa hana ʻoki laser, welding a stamping no nā waiwai maʻamau a maʻamau.