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Thickness Tolerance Grade of Hot-Rolled Steel Plate

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GB/T 709-2019 Chinese National Standard specifies the deviation of hot rolled steel plate thickness:

The thickness tolerance categories of medium thick plates include four grades: N, A, B, and C. 


The detailed tolerances are as follows:

Class N: Lower deviation -2~-0.45mm

Class A: Lower deviation of -1.3~-0.35mm,

Class B: Lower deviation -0.30mm

Class C: Lower deviation -0.00mm


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