Bututun bakin ƙarfe wani tsari ne mai launi da yawa wanda ya ƙunshi abubuwa daban-daban a ƙayyadaddun ma'auni. Abubuwan farko sun haɗa da ƙarfe, chromium, nickel, carbon, da ƙananan adadin sauran abubuwa. Dangane da haɗuwa da waɗannan ma'auni, ana iya samar da kaddarorin bututun bakin karfe daban-daban.
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CE Certificate
ISO 9001 Certificate
API Q1 Takaddun shaida
Takaddun shaida na ABS
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API-5CT Takaddun shaida
