表面积 H×B t1 t2 r ㎡/t 100×100 100×100 6 8 10 17.2 32.588 125×125 125×125 6.5 9 10 23.8 31.597 150×150 150×150 7 10 13 31.9 28.339 175×175 175×175 7.5 11 13 40.3 26.203 200×200 8 12 16 50.5 23.921 200×204 12 12 16 56.7 21.446 # 250×250 9 14 16 72.4 20.884 250×255 14 14 16 82.2 18.516 # 294×302 12 12 20 85 21.259 # 300×300 10 15 20 94.5 19.217 300×305 15 15 20 106 17.226 344×348 10 16 20 115 18.27 # 3