Calculation method:
Steel density =7.85 kg/cm3
Meter weight of steel pipe =0.00785× cross-sectional area (cross-sectional area unit square millimeter) (meter weight unit kilogram/meter)
Diameter 32*2.5 steel pipe meter weight = 0.00785 * (0.25 * 3. 14 * 32? -0.25×3. 14×27? ) =1.818kg/m
Extended data:
Meter weight of steel pipe =0.00785× (cross-sectional area) (cross-sectional area unit square millimeter) (meter weight unit kilogram/meter)
Cross-sectional area of steel pipe = external circular area-internal circular area =0.25×3. 14×(D? -Dee? ) (D outer circle diameter, D inner circle diameter)
The length of steel with hollow section is much larger than its diameter or circumference.
According to the section shape, it is divided into circular, square, rectangular and special-shaped steel pipes; According to the material, it is divided into carbon structural steel pipe, low alloy structural steel pipe, alloy steel pipe and composite steel pipe;
According to the use, it is divided into pipelines, engineering structures, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment steel pipes, etc. According to the production process, it is divided into seamless steel pipes and welded steel pipes, in which seamless steel pipes are divided into hot rolling and cold rolling (drawing), and welded steel pipes are divided into straight seam welded steel pipes and spiral seam welded steel pipes.
Steel pipe is not only used for conveying fluids and powdery solids, exchanging heat energy and manufacturing mechanical parts and containers, but also an economical steel. It can reduce the use of steel pipes to manufacture grids, pillars and mechanical supports of building structures.
Light weight, saving 20-40% of metal, and realizing the mechanized construction of the factory.
Using steel pipes to make highway bridges can not only save steel and simplify construction, but also greatly reduce the area coated with protective layers and save investment and maintenance costs.
Steel pipes can be divided into seamless steel pipes and slotted steel pipes according to production methods, which are referred to as straight welded steel pipes for short.
1. Seamless steel pipes can be divided into hot-rolled seamless pipes, cold-drawn pipes, precision steel pipes, hot-expanded pipes, cold-spun pipes and extruded pipes according to production methods. Seamless steel pipe is made of high-quality carbon steel or alloy steel, which is divided into hot rolling and cold rolling (drawing).
2. Welded steel pipes are divided into furnace welded pipes, electric welding (resistance welding) pipes and automatic arc welded pipes, straight welded pipes and spiral welded pipes, as well as round welded pipes and special-shaped (square and flat) pipes due to their different welding forms. ) welded pipes because of their end shapes.
Welded steel pipes are made of steel plates by butt welding or spiral welding. According to the manufacturing method, it is divided into welded steel pipes for low-pressure fluid transportation, spiral welded steel pipes, direct rolled welded steel pipes and welded steel pipes. Seamless steel pipes can be used in various industries, such as liquid pneumatic pipelines and gas pipelines. Welded pipes can be used for water pipelines, gas pipelines, heating pipelines, electrical pipelines, etc.
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