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The pig iron grades indicate that the cast iron grades are represented by the symbols specified in Table 1 and Arabic numerals.
a. Arabic numerals represent the average silicon content (in parts per thousand).
For example: Casting pig iron containing 2.75%~3.25% of silicon, its grade is denoted as "Z30";
The steelmaking pig iron containing 0.85% to 1.25% of silicon is indicated by the designation "L10".
b. Vanadium-bearing pig iron and decarburized low-phosphorus ferrite, and Arabic numerals mean the average content of vanadium and carbon, respectively (in parts per thousand).
For example, vanadium-containing pig iron containing not less than 0.40% vanadium is graded as "F40", and decarburized low-phosphorus grain iron with carbon content of 1.20%-1.60% is designated "TL14".
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