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40 stands for carbon percentage and 8 indicates the designation of carbon

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11y ago
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11y ago

It is an percentage of Carbon (letter C) in the steel. The last digit, in this case 8, should be multiplied by 0.01% to find out the Carbon concentration.

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12y ago

0.4%carbon 0.05%mn

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Q: What does the numbers 40 and 8 indicate in 40C8 steel?
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