One: section steel. According to the shape of the section, it is divided into round steel, flat steel, square steel, hexagonal steel, octagonal steel, angle steel, I-beam, channel steel, T-beam, B-beam, etc. Two: Steel plate! According to the thickness, it is divided into thick steel plate (thickness % mm) and thin steel plate (thickness! % mm) 'According to the purpose, it is divided into general steel plate, boiler steel plate, shipbuilding steel plate, automobile thick steel plate, general thin steel plate, roofing Sheet steel, pickling sheet, galvanized sheet, tin-plated sheet and other special steel sheets, etc. Three: Steel strips are divided into hot-rolled steel strips and cold-rolled steel strips according to the delivery state. Four: Steel pipes! According to the manufacturing method Seamless steel pipes (hot-rolled and cold-drawn) and welded steel pipes are divided into general steel pipes, water gas steel pipes, boiler steel pipes, petroleum steel pipes and other special copper pipes according to their uses. Galvanized steel pipes and steel pipes are divided according to surface conditions. Non-galvanized steel pipes are divided into threaded steel pipes and non-threaded steel pipes according to the pipe end structure. Five: Steel wire! According to the processing method, it is divided into cold drawn steel wire and cold rolled steel wire, etc. 'According to the purpose, it is divided into general steel wire, wrapping steel wire, overhead communication steel wire, welding steel wire, spring steel wire, piano steel wire and other special steel wire, etc.# According to the surface The situation is divided into polished steel wire, polished steel wire, pickled steel wire, smooth steel wire, black steel wire, galvanized steel wire and other metal steel wire, etc. Six: steel wire rope! Stranded steel ropes, etc. 'are divided into organic core steel ropes and metal core steel ropes, etc. according to the inner core material; non-galvanized steel ropes and galvanized steel ropes are divided according to surface conditions.