چگونه ASTM A6 اندازه پرتو I - را طبقه بندی می کند؟

ASTM A6 classifies I-beams by nominal depth (4-44 inches) and weight per foot (e.g., W12×26 = 12-inch depth, 26 lbs/ft). It defines dimensional tolerances (±1/8 inch for depth, ±1/16 inch for flange thickness) and requires straightness within 1/8 inch per 10 feet. The standard includes "W" (wide flange), "S" (American standard), and "M" (miscellaneous) shapes, with W-shapes preferred for structural use due to their balanced flange-to-web ratio. ASTM A6 also mandates ultrasonic testing for I-beams >ضخامت 2 اینچ برای تشخیص نقص داخلی ، اطمینان از قابلیت اطمینان در برنامه های مهم مانند آسمان خراش ها.