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steel
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CARBON TOOL STEEL
Specification:

Hot-Rolled Round Bar:φ10~160mm
Cold Drawn Bar & Coil: φ8~40mm
Forged Round Bar : φ80~700mm
Forged Square Bar:8027002mm

Standard:

GB1298-86 T7.T8.T8Mn.T9.
T10.T11.T12.T13.