Minimum center hardnessSteel plate thickness ≤20 mm: minimum guaranteed value of surface hardness, 470 HBWSteel plate thickness> 20 mm: 95% of the minimum guaranteed value of surface hardness (*)Typical value of impact toughness:35J/-40C (-40F):According to the standard EN ISO 148-1, three full-size V-groove impact samples (10X10 mm2) parallel to the rolling direction are tested at -40C, and the average value of their impact energy is obtained as the impact toughness of the steel plate (**) .
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