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H-beams are divided into 4 categories, their codes are:

Equal flange H-beam HP (section height = width)

Wide flange H-beam HW (W is the English prefix of Wide)

Middle flange H-beam HM (M is the English prefix of Middle)

Narrow flange H-beam HN (N is the English prefix of Narrow)

The difference between I-beam HW HMHNH steel:

The flange of I-beam is of variable cross-section, which is thicker on the web and thin on the outside; the flange of H-beam is of equal cross-section.

HW HM HNH is the general name of H-beam, H-beam is welded; HW HMHN is hot-rolled

HW is that the height of H-beam and the width of the flange are basically equal; it is mainly used for steel core columns in reinforced concrete frame structure columns, also known as rigid steel columns; it is mainly used for columns in steel structuresHW is that the height of H-beam and the width of the flange are basically equal; it is mainly used for steel core columns in reinforced concrete frame structure columns, also known as rigid steel columns; it is mainly used for columns in steel structures

HM is the ratio of H-beam height to flange width is roughly 1.33 ~ 1.75 Mainly in steel structures: used as steel frame columns and used as frame beams in frame structures bearing dynamic loads; for example: equipment platforms

HN is the ratio of H-beam height and flange width greater than or equal to 2, mainly used for beams; the use of I-beams is equivalent to HN-beams;