In accordance with national standards, it is categorized into the following three types: 1. Class A Steel: This type of steel is supplied to ensure mechanical properties, with its grade indicated by the character "A" or "甲" followed by an Arabic numeral. There are 1 to 7 grades, i.e., A1, A2, ..., A7 (or A1, A2, ..., A7). The higher the number, the greater the yield strength and tensile strength of the Class A steel, but the lower the elongation. 2. Class B Steel: This steel is supplied to ensure chemical composition, with mechanical properties fluctuating within a certain range. Its properties can be improved through heat treatment. The grades include B1, B2, ..., B7, with the higher the number, the higher the carbon content, strength, and the poorer the plasticity. 3. Special Class Steel (Class C Steel): This type of steel ensures both chemical composition and mechanical properties, and is of high quality. It includes grades C1, C2, ..., C7.

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