Is the steel column of the steel structure HM a special steel?

Answer:

Because the legs are parallel inside and outside, the legs are at right angles and are assembled and assembled into components to save welding and riveting, and the work load is 25%. Often used in large capacity requirements, large cross section stability, such as buildings, high-rise buildings, as well as bridges, ships, lifting transport machinery, equipment foundation, support, foundation piles.

It should be in capitals: HM, HW, wide flange, and HN narrow flange. Steel is Q235, Q345 are low carbon steel hot rolled.

H steel is a new type of economical construction steel. H type steel cross section shape is reasonable in economy, good mechanical properties, rolling each point on the extended section is uniform, small internal stress, compared with the ordinary beam, a section modulus, light weight, saving advantages of metal, can make the building structure to reduce 30-40%;

The mid flange H section steel HM (M for Middle English prefix) in GB/T 112631998 this standard inside, not special steel;