sigh007 发表于 2012-3-31 17:50:38

MIL-S-18729C


                   MIL-S-18729C, MILITARY SPECIFICATION, STEEL PLATE, SHEET, AND STRIP, ALLOY, 4130, AIRCRAFT QUALITY (5 MAR 1965) ., This specification covers chrome-molybdenum alloy 4130, steel sheet, strip, and plate of thickness to and including 1.50 inches.         
         
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