HaulingAss
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The alloy specification does not denote the hardness specification.While 3mm is a substantial thickness of metal for the skin of an automobile, 300 series stainless is not "hardened steel". It's actually very soft.
Cold rolling provides different levels of hardness depending upon the pressures used and the number of passes through the rollers. For example, annealed (soft), 1/4 hard, 1/2 hard, 3/4 hard and full hard. Different mills may use different ratings.
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