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What P number is 4140 steel?
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Jun 13, 2003 · 4140 is a SAE (Society of Automotive Engineers) designation, which has nothing to see with ASME (American Society of Mechanical Engineers) ...
2-1/4" 4140 Hot Rolled, As-Rolled, Plate ; Dimensions: 2-1/4" ; Material: Alloy ; Grade: 4140 ; Shape: Plate ; Finish: Hot Rolled.