Welded pipe: The specifications are seamless pipes. Welded steel pipes are expressed in millimeters per outside diameter * wall thickness. Metric welded pipes are made of ordinary carbon steel, high quality carbon steel or general energy low alloy steel and are hot zone welded. , cold drawing method of cold areas or hot areas after welding
1. Welded steel pipes for low pressure fluid transportation (GB/T3092-1993) are also called general welded pipes, commonly known as black pipes. It is a welded steel pipe used to transport water, gas, air, oil, heating steam and other general low-pressure fluids. Steel pipes are divided into ordinary steel pipes and thickened steel pipes according to the wall thickness; The shapes of the connecting ends are divided into threadless steel pipes (smooth pipes) and threaded steel pipes. Steel pipe specifications are expressed in nominal diameter (mm), which is an approximate value of the inner diameter. It is usually expressed in inches, such as 11/2. Welded steel pipes for low pressure fluid transportation are not only directly used to transport fluids, but also can be used as original pipes for galvanized welded steel pipes for low pressure fluid transportation.
2. Galvanized welded steel pipe for low pressure fluid transportation (GB/T3091-1993) is also called galvanized welded steel pipe, commonly known as white pipe. It is a hot-dip galvanized welded steel pipe (furnace welded or electric welded) used to transport water, gas, air, oil, heating steam, warm water and other fluids usually of lower pressure or other purposes. Steel pipes are divided into ordinary galvanized steel pipes and thick galvanized steel pipes according to the wall thickness; The shapes of connecting ends are divided into threadless galvanized steel pipe and threaded galvanized steel pipe. Steel pipe specifications are expressed in nominal diameter (mm), which is an approximate value of the inner diameter. It is usually expressed in inches, such as 11/2.
3. Common carbon steel wire casing (GB3640-88) is a steel pipe used to protect cables in electrical installation projects, such as industrial and civil buildings and mechanical equipment installation.
4. Straight seam electrically welded steel pipe (YB242-63) is a steel pipe with the welding seam and the steel pipe longitudinally parallel. It is generally divided into metric electrically welded steel pipes, electrically welded thin-walled pipes, transformer cooling oil pipes, etc.
5. Spiral submerged arc welded steel pipe (SY5036-83) for transporting pressurized fluids is made of coils of hot-rolled steel strips, spiral formed at normal temperature and welded by submerged arc welding of double sided. They are used for the transfer of fluids under pressure. Spiral seam steel pipe. Steel pipes have large pressure bearing capacity and good welding performance. After several rigorous scientific inspections and tests, it is safe and reliable to use. The steel pipe has a large diameter and high transportation efficiency, which can save investment in pipeline laying. It is mainly used for pipelines that transport oil and natural gas.
6. Spiral seam high frequency welded steel pipe (SY5038-83) for pressurized fluid transportation is made of hot-rolled steel strips as a pipe blank, spiral formed at normal temperature and welded by high frequency lap welding. They are used for the transfer of fluids under pressure. High frequency welded steel pipe with spiral seam. Steel pipes have strong pressure-bearing ability, good plasticity, and are easy to weld and process. After several rigorous and scientific inspections and tests, it is safe and reliable to use. The diameter of the steel pipe is large and the transportation efficiency is high. It can save investment in laying pipes. It is mainly used for laying pipelines for the transportation of oil and natural gas.
7. Generally, spiral seam submerged arc welded steel pipes (SY5037-83) for low-pressure fluid transportation use hot-rolled steel strip coils as tube blanks and are often formed into spiral by double-sided or single-sided automatic submerged arc welding. automatic welding
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