Japanese Standard (1)
   In the grades of Japanese steel  (JIS series), ordinary structural steel  mainly consists of three parts to represent the material.    For example, S (Steel) represents steel, F (Ferrim) represents iron; The  second part represents different shapes, types, and uses, such as P (Plate) for  plates, T (Tube) for tubes, and K (Kogu) for tools; The third part represents  the characteristic number, which is generally the tensile strength. For example,  SS400 represents Steel, the second S represents Structure, 400 represents the  lower limit tensile strength of 400MPa, and the overall represents ordinary  structural steel with a tensile strength of 400MPa.
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