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Classification of tool steel
Tool steel is divided into three categories: carbon tool steel, alloy tool steel and high-speed tool steel. Carbon tool steel uses the symbols specified in Table 1 of the standard chemical element symbols and Arabic numerals to indicate the average carbon content (in a few thousandths).
a. Ordinary carbon tool steel with manganese content, after the tool steel symbol T, is Arabic numerals. For example: carbon tool steel with an average carbon content of 0.80%, its grade is expressed as T8. (Guide: Knowledge of fasteners and threads)
b. For carbon tool steels with higher manganese content, add manganese element symbols after the tool steel symbol T and Arabic numerals, for example: T8Mn.
c. For high quality carbon tool steel, add A at the end of the grade, for example: T8MnA.
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