Cibiyar Tianjin Yuantai Derun Group ta square da rectangular welded karfe bututu aka ba da AAAAA samfurin takardar shaida ta Cibiyar Metallurgical Industry Planning.

Dangane da ƙayyadaddun buƙatun na "tabbatar da tabbacin" don murabba'i da bututun welded rectangular don dalilai na tsari, murabba'i da bututun ƙarfe na rectangular don dalilai na tsarin gabaɗaya, ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun la'akari da daidaiton inganci, ra'ayoyin inganci, takaddun samfur, lambar yabo a matakin samfurin. , Ƙarfin tabbatarwa mai inganci a matakin masana'antu, iyawar ƙirƙira, amincin kamfani, matakin sabis, matakin sanarwa da sauran abubuwan ciki. Ƙaddamar da watsawar iyawar ingancin ingancin samfur da ƙimar samfurin, haɓaka kimiyya, m, ci-gaba da ma'auni na kimantawa, samar da tushe don mataki na gaba na tsarin manufa welded bututu, janar manufa sanyi birgima ko zafi birgima welded karfe bututu tabbatar. alamar takaddun shaida, noma da gina samfuran ƙarfe "tabbataccen alamar".