The CNC cutting machine cuts the special quality carbon structural steel in the board (S ≤ 0.020%, P ≤ 0.025%), and the symbol “E†is added after the brand.
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For example, a special high-quality carbon structural steel with an average carbon content of 0.45% is indicated by the designation “45Eâ€.
The representation method of high-quality carbon spring steel grades is the same as that of high-quality carbon structural steel grades (65, 70, 85, and 65 Mn steels exist simultaneously in both GB/T1222 and GB/T699).
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