Seamless steel pipe is a kind of long steel with hollow section and no joint around it. Seamless steel tube is made of steel ingot or solid billet through perforation, and steel tube for concrete filled steel tube construction
1. Concrete-filled steel tubular structures can be divided into rectangular, circular and polygonal reinforced concrete structures according to the different section modes. Rectangular concrete-filled steel tubular structures are widely used.
2. Steel tube for concrete filled steel tube construction can be welded by straight seam, spiral seam and seamless steel tube.
Classification of Hot Rolled Reinforcement Bars for Reinforced Concrete
1. Optical circle: HPB300; code name
2. Ribbed: HRB335, HRBF335, HRB400, HRBF400, HRB500, HRBF500 and then made by hot rolling, cold rolling or cold dialing. Seamless steel tube plays an important role in China's steel pipe industry. Seamless steel pipes are widely used in water and gas pipelines, as well as in petroleum, chemical industry, boilers, automobiles, tractors, aviation and other fields.
Classification of Seamless Steel Pipe
According to news reports, China seamless pipeline network can be divided into hot-rolled (extruded, expanded) seamless pipe and cold-drawn (tied) seamless pipe according to different consumption methods.
According to the material, it can be divided into ordinary and high quality carbon structural steel (Q215-A~Q275-A and 10-50 steel), low alloy steel (09MnV, 16Mn, etc.), alloy steel, stainless acid-resistant steel, etc.
According to its use, it can be divided into two categories: general use (for water conveyance, gas pipeline and structural parts, mechanical parts) and special use (for boilers, geological exploration, bearings, acid resistance, etc.).
Specification and Dimension of Seamless Steel Pipe
The nominal diameter is denoted by the symbol DN, and the outer diameter of seamless steel pipe is denoted by the letter D, followed by the size and wall thickness of the additional outer diameter, such as seamless steel pipe with an outer diameter of 108 and a wall thickness of 5MM, denoted by D108*5.
Formula for calculating the weight of seamless steel tube
The formula for calculating the weight per meter is W(kg/m)=0.02466*wall thickness*(outer diameter-wall thickness). The theoretical weight of the commonly used specifications is shown in the table below.
Use of Seamless Steel Pipe
It is widely used in the manufacture of structural and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction. Steel pipe is also indispensable information for all kinds of conventional weapons. Steel pipe is used to manufacture barrels, barrels, etc.
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