1 When the average carbon content of the alloy tool steel grade is ≥1.0%, the carbon content is not indicated; when the average carbon content is <1.0%, it is expressed in parts per thousand. For example, Cr12, CrWMn, 9SiCr, and 3Cr2W8V.
2 The method for expressing the content of alloying elements in steel is basically the same as that of alloy structural steel. However, for the alloy tool steel with a lower chromium content, the chromium content is expressed in parts per thousand, and a "0" is added before the number indicating the content, so as to express it and the general element content in a few percent. The difference is open. For example, Cr06.
3 The steel grade of high-speed tool steel generally does not indicate the carbon content, only a few percent of the average content of various alloying elements. For example, the steel number of the tungsten high speed steel is expressed as "W18Cr4V". The steel number is marked with the letter "C", indicating that its carbon content is higher than the general steel number of the uncrowned "C".
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