TFS iron also has iron patterns on the surface, which looks darker than tin iron. It is also called black iron. The hardness is generally T3-T4. The workability is not good. Some round cans are mainly used. The advantage is that the oxidation resistance is relatively high, and it is not easy to scratch and grow. rust! The price has a slight advantage, and those who are more concerned about the price can choose this type of material.
