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Q345B seamless square pipe is a long strip of steel with hollow section and no joints around it. Steel pipe has hollow section and is widely used as pipeline for conveying fluid, such as pipeline for conveying oil, natural gas, gas, water and some solid materials. Compared with solid steel such as round steel, steel pipe has the same bending and torsional strength and light weight. It is an economic section steel. It is widely used in the manufacture of structural parts and mechanical parts, such as petroleum drill pipe, automobile transmission shaft, bicycle frame and steel used in construction.
1. The standard number of galvanized welded square pipe for low pressure fluid transmission is GB / t3091-2008. Representative materials: Q235A, q235bq345b, etc. It is mainly used for conveying water, gas, air, oil and heating hot water or steam. It is generally used for low pressure fluids.
2. The standard number of galvanized welded square pipe for low pressure fluid transmission is GB / t3092-2008. The representative material is the same as above. It is mainly used to transport low pressure fluids such as water, gas, air, oil, heating hot water or steam. The surface of square pipe adopts hot galvanizing or cold galvanizing anti-corrosion process.
3. Standard No. of welded square pipe for mining fluid transportation: GB / t14291-2000. The representative material is grade Q235A and B steel, which is mainly used for straight seam welded square pipes for mine air pressure, drainage and shaft gas drainage.
4. The standard number of large-diameter welded square tubes for low-pressure fluid transportation is GB / t14980-1994. Representative material: grade q235ab. It is mainly used to transport low-pressure fluids such as water, sewage, gas, air and heating steam.
5. The standard number of stainless steel welded square pipe for mechanical structure is GB / t12770-1991. Representative materials: 0Cr13, 1Cr17, 00cr19ni11, 1Cr18Ni9, 0cr18ni11nb, etc. It is mainly used for machinery, automobile, bicycle, furniture, hotel and restaurant decoration and other mechanical parts and structural parts. Application: used in machinery manufacturing, construction industry, metallurgical industry, agricultural vehicles, agricultural greenhouses, automobile industry, railways, highway guardrails, container skeleton, furniture, decoration and steel structure. For engineering construction, glass curtain wall, door and window decoration, steel structure, guardrail, machinery manufacturing, automobile manufacturing, household appliance manufacturing, shipbuilding, container manufacturing, electric power, agricultural construction, agricultural greenhouse, bicycle frame and motorcycle frame; Shelves, fitness equipment, leisure and tourism supplies, steel furniture, various specifications of oil casing, oil pipe and pipeline pipe, water, gas, sewage, air, heating and other fluid transportation, firefighting and support, construction industry, etc
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