I-beam is mainly divided into ordinary I-beam, light I-beam and low alloy light I-beam. Ordinary I-beam and light I-beam flanges are thick on the web plate and thin on the outside.

Hot-dip galvanized I-steel is also called hot-dip galvanized I-steel or hot-dip galvanized I-steel. It is to immerse the I-beam after derusting into molten zinc at about 500 ℃ to attach a zinc layer to the surface of the I-beam, thus achieving the purpose of anti-corrosion. It is suitable for strong corrosive environments such as various strong acids and alkali fogs.

Stainless steel I-beams are made of 201(1Cr17Ni5Mn6N), 202(2 Cr13Mn9Ni4), 301(1 Cr17Ni7), 303(Y1Cr18Ni9), 304(OCr18Ni9), 304L (03 Cr19Ni10), 316(0 Cr17Ni12Mo2), 316L(00 Cr17Ni14Mo2), 321 (1 Cr18Ni9Ti), 420( 2cr13), 310S(0 Cr25Ni20), etc.