A=B, t (mm), r1 (mm), r2 (mm), 斷面積 (c㎡), 單位重量 (kg/m), 備註. 20, 3, 4, 2, 1.127, 0.885. 25, 2.5, 0.946. 25, 3, 4, 2, 1.427, 1.12, 常用鋼種.
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