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Shenzhen Shengjinlong Iron and Steel Co., Ltd.

Contact: Mr. Wu

Contact number: 0755-89345123

Mobile: 13682609066


Address: No. 06, Building A, Building Materials Market, Pingshan New District, Shenzhen

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What is the implementation standard of the square tube national standard?

Square tube is a type of square tube and rectangular tube, that is, steel tubes with equal and unequal sides. It is a strip of steel that has been processed and rolled. Generally, the strip is unpacked, flattened, crimped, welded to form a round tube, and then rolled into a square tube by a round tube and then cut into a desired length. Let's talk about the implementation standards for the square tube national standard?


Application areas: widely used in machinery manufacturing, construction, metallurgical industry, agricultural vehicles, agricultural greenhouses, automotive industry, railways, highway guardrails, container skeletons, furniture, decoration and steel structure.

Used in engineering construction, glass curtain wall, door and window decoration, steel structure, guardrail, machinery manufacturing, automobile manufacturing, home appliance manufacturing, shipbuilding, container manufacturing, electric power, agricultural construction, agricultural greenhouse, bicycle frame, motorcycle frame, shelf, fitness equipment, Leisure and travel goods, steel furniture, oil casings of various specifications.

Standards for different uses:

1. Galvanized welded square tube for low pressure fluid transportation, standard No. GB/T3091-2008. Representative materials Q235A, Q235BQ345B and so on. Mainly used to transport water, gas, air, oil and heating hot water or steam, the use is limited to general lower pressure fluids.

2. Galvanized welded square tube for low pressure fluid transportation, standard No. GB/T3092-2008. The representative material is the same as above. It is mainly used to transport water, gas, air, oil and heating water or steam to generally lower pressure fluids. The outer surface of the square tube is hot-dip galvanized or cold-galvanized anti-corrosion technology.

3, mining fluid transport welding square tube, standard number I GB/T14291-2000. Representing material Q235A, B grade steel, mainly used for straight seam welding square pipe for mine pressure, drainage and shaft discharge gas.

4. Large-diameter welded square tube for low-pressure fluid transportation, the standard number is GB/T14980-1994. Represents material Q235AB level. It is mainly used to transport low-pressure fluids such as water, sewage, gas, air, and heating steam.

5. The mechanical structure is made of stainless steel welded square tube, the standard number is GB/T12770-1991. Representative materials are 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, and the like. Mainly used in machinery, automobiles, bicycles, furniture, hotel and restaurant decoration and other mechanical parts and structural parts.

The above explanation is about the implementation standards of the square tube national standard. If you remember these, then some square tube appearance inspection will not escape your eyes. Have you learned? If you want to know more information, you can contact us directly. Shengjinlong Steel is a large-scale warehouse-operated trading company specializing in selling steel products.