Who knows what HW, HN and HM mean in steel structures?
It should be the difference between the elements added to different steels.HW is high tungsten, HN is high nickel, HM is high manganese
TM, TN, TW also refers to the middle flange, narrow flange, wide flange, T steel, in which the width of the wing refers to the flange width, B= section height H, mid wing refers to B= (1/2~2/3) H, narrow wing refers to B=1/3~1/2H
Upstairs, the answer is wrong, HW refers to the wide flange, H steel, HM refers to the middle flange H steel, HN refers to the narrow flange H steel, in which the "W M N" are English, "wide", "middle", "narrow", the first letter "wide.Middle. narrow""
