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Seamless square pipe is a square steel pipe with four corners. It is a square steel pipe formed by cold drawing and extrusion of seamless steel pipe. There is an essential difference between seamless square pipe and welded square pipe. Steel pipe has hollow section and is widely used as a pipeline for conveying fluid.
Plasticity refers to the ability of metal materials to produce plastic deformation (permanent deformation) without damage under load.
Hardness is a pointer to measure the hardness and softness of metal materials. In this production, the most commonly used method to determine the hardness is the indentation hardness method. It uses an indenter with a certain geometry to press into the surface of the tested metal material under a certain load, and the hardness value is determined according to the degree of indentation.
The commonly used methods include Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV).
Strength, plasticity and hardness are indicators of the mechanical properties of metals under static load. In fact, many machine parts work under cyclic load, under which fatigue will occur. Special shaped steel pipes with other section shapes are also required.
Welded steel pipe for low pressure fluid transmission (GB / t3092-1993) is also known as general welded pipe, commonly known as black pipe. It is a welded steel pipe used for conveying water, gas, air, oil, heating steam and other general low pressure fluids and other purposes. The wall thickness of steel pipe connection is divided into ordinary steel pipe and thickened steel pipe; The nozzle end is divided into non threaded steel pipe (smooth pipe) and threaded steel pipe. The specification of steel pipe is expressed in nominal diameter (mm), which is the approximate value of inner diameter. It is customary to use inches, such as 11 / 2. The welded steel pipe for low-pressure fluid transmission is not only directly used for fluid transmission, but also widely used as the original pipe of galvanized welded steel pipe for low-pressure fluid transmission.
Galvanized welded steel pipe for low pressure fluid transmission (GB / t3091-1993) is also known as galvanized welded steel pipe, commonly known as white pipe. It is a hot-dip galvanized welded (furnace welding or electric welding) steel pipe used for conveying water, gas, air oil, heating steam, heating water and other general low pressure fluids or other purposes. The wall thickness of steel pipe connection is divided into ordinary galvanized steel pipe and thickened galvanized steel pipe; The nozzle end is divided into non threaded galvanized steel pipe and threaded galvanized steel pipe.
Ordinary carbon steel wire sleeve (gb3640-88) is a steel pipe used to protect wires in electrical installation projects such as industrial and civil buildings and installation of machinery and equipment.
Straight seam electric welding steel pipe (yb242-63) is a steel pipe whose weld is longitudinally parallel to the steel pipe. It is usually divided into metric welded steel pipe, welded thin-walled pipe, transformer cooling oil pipe, etc.
Spiral seam submerged arc welded steel pipe (SY5036-83) for pressure fluid transportation is a spiral seam steel pipe used for pressure fluid transportation, which takes hot-rolled steel strip as pipe blank, often warm spiral forming and welded by double-sided submerged arc welding. The steel pipe has strong pressure bearing capacity and good welding performance. After various strict scientific inspections and tests, it is safe and reliable to use. The steel pipe has large diameter and high transmission efficiency, and can save the investment in laying pipelines. The pipeline is mainly used for transporting oil and natural gas.
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