Black annealing steel pipe is one of the most common steel pipes. If the cold rolled steel is heated to the annealing temperature and the surface color becomes black due to high temperature contact with air, it is called black drawn steel. Its surface is not polished, so it is black. The physical properties become soft, which is convenient for further welding into steel pipe. The common hardness is 57hrb, which can also be reduced to different hardness as required.
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Galvanized steel strip is a kind of raw material called (zinc, aluminum) which is used to coat the long and narrow steel plate cold rolled or hot rolled in varying degrees. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. Galvanized steel strip is generally used to make steel pipes, such as greenhouse pipe, drinking water pipe, heating pipe and gas transmission pipe; It can also be used in construction, light industry, automobile, agriculture, animal husbandry, fishery, commerce and other industries.
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PPGI is the abbreviation of pre-painted galvanized, that is color coated galvanized.It usually refers to steel products such as PPGI coil and PPGI sheet. On the basis of galvanized coil, it is covered with color coating, which gives more colors to the product, and the colorful and beautiful surface makes it more widely used.
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Galvanized square pipe is a kind of hollow square section steel pipe with square section shape and size made of hot-rolled or cold-rolled galvanized strip or galvanized coil after cold bending and high-frequency welding; Because the galvanized square pipe is galvanized on the square pipe, the application scope of galvanized square pipe has been greatly expanded compared with square pipe. It is mainly used for curtain wall, construction, machinery manufacturing, steel construction projects, shipbuilding, solar power generation support, steel structure engineering, power engineering, power plant, agricultural and chemical machinery, glass curtain wall, automobile chassis, airport, etc.
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Cold rolled sheet is a product made of hot rolled coil as raw material and rolled below the recrystallization temperature at room temperature. It is mainly used in automobile manufacturing, electrical products, etc.
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