来自中国志金钢铁网1 钢材的基本公式：角钢=边长*边厚*0.015焊管/无缝钢管=(外径-壁厚)*壁厚*0.02466方管=边长*4*0.00785=周长除以3.14矩形管=(长+宽)*2*壁厚*0.00785扁钢=宽度*壁厚*0.00785镀锌扁钢=宽度*壁厚*0.
