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+--- Thread: What do Steel Grade Numbers Mean? (/showthread.php?tid=85124)
What do Steel Grade Numbers Mean? - aluhm - 12-14-2021
For SAE/ASTM 10XX steels, the last two numbers are the approximate carbon content. For example, 1008 steel contains about 0.08% carbon and 1018 steel contains about 0.18% carbon.