Stainless steel square tube
Stainless steel square tube is a kind of hollow long steel. Because the section is square, it is called square tube. A large number of pipelines are used to transport fluids, such as oil, natural gas, water, gas, steam, etc. in addition, when the bending and torsional strength are the same, the weight is relatively light, so they are also widely used to manufacture mechanical parts and engineering structures.
Classification of stainless steel square pipe: square pipe is divided into seamless steel pipe and welded steel pipe (slotted pipe). According to the section shape, it can be divided into square and rectangular pipes. Circular steel pipes are widely used, but there are also some special-shaped steel pipes such as semicircular, hexagonal, equilateral triangle and octagonal. For the stainless steel square pipe bearing fluid pressure, hydraulic test shall be carried out to check its pressure resistance and quality. It is qualified if there is no leakage, wetting or expansion under the specified pressure. Some steel pipes shall also be subject to crimping test, flaring test, flattening test, etc. according to the standard or the requirements of the demander. Specification of square tube: 5 * 5 ~ 150 * 150 mm thickness: 0.4 ~ 6.0 mm Square tube material: 304, 304L, TP304, TP316L, 316, 316L, 316Ti, 321, 347h, 310S Application fields: it is widely 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, motorcycle frame, shelf, fitness equipment, leisure and tourism products, steel furniture, various specifications of oil casing, oil pipe and pipeline pipe, water, gas, sewage Air, heating and other fluid transportation, fire fighting and support, construction industry, etc. Classification of stainless steel pipe: stainless steel seamless steel pipe and stainless steel welded steel pipe (seamless steel pipe) are two basic categories. According to the outer diameter shape of steel pipe, it can be divided into circular pipe and special-shaped pipe. Circular steel pipe is widely used, but there are also some special-shaped steel pipes such as square, rectangle, semicircle, hexagon, equilateral triangle and octagon. Hydraulic test and radiographic inspection shall be conducted for the steel pipes bearing fluid pressure to check their pressure resistance and quality. It is qualified if there is no leakage, wetting or expansion under the specified pressure. Some steel pipes shall also be subject to crimping test, flaring test, flattening test, etc. according to the standard or the requirements of the demander. Seamless stainless steel pipe, also known as stainless steel seamless pipe, is made of steel ingot or solid pipe blank through perforation, and then made by hot rolling, cold rolling or cold drawing. The specification of seamless steel pipe is expressed in mm of outer diameter * wall thickness. The full name of 304 stainless steel pipe is SUS304 stainless steel pipe. SUS304 stainless steel pipe is a stainless steel pipe of American brand, and the domestic brand is equivalent to 0Cr19Ni9 stainless steel pipe, which is usually replaced by 0Cr18Ni9. The mechanism of stainless steel rust prevention is that alloy elements form a dense oxide film to isolate oxygen contact and prevent further oxidation. So stainless steel is not "stainless". 304 material may rust for the following reasons: 1. Chloride ion exists in the service environment. Chloride ions exist widely, such as salt, sweat, sea water, sea breeze, soil and so on. Stainless steel corrodes rapidly in the presence of chloride ions, even more than ordinary low carbon steel. Therefore, there are requirements for the service environment of stainless steel, and it needs to be wiped frequently to remove dust and keep clean and dry. 316 and 317 stainless steels (see the following for the properties of 317 stainless steel) are molybdenum containing stainless steels. The molybdenum content of 317 stainless steel is slightly higher than that of 316 stainless steel. Due to the molybdenum in the steel, the overall performance of this steel is better than 310 and 304 stainless steel. Under high temperature conditions, 316 stainless steel has a wide range of applications when the concentration of sulfuric acid is lower than 15% and higher than 85%. 316 stainless steel also has good chloride corrosion properties, so it is usually used in marine environment. With the development of social economy, the application of stainless steel pipe has been more and more popular. It will bring new changes in various fields. Theoretical weight of stainless steel pipe: w = outer diameter - wall thickness x wall thickness x0.02491. Specification table of thick wall rectangular pipe (mm) sixteen × sixteen × 0.4～1.5 three hundred and eighty × three hundred and eighty × 8.0～30.0 ten × twenty × 0.6～1.5 two hundred and fifty × one hundred and fifty × 6～12.0 eighteen × eighteen × 0.4～1.5 four hundred × four hundred × 8.0～30.0 fourteen × twenty-one × 0.6～1.5 two hundred and fifty × one hundred × 6～12.0 twenty × twenty × 0.4～1.5 four hundred and twenty × four hundred and twenty × 10.0～30.0 fifteen × thirty × 1.5～1.5 two hundred and fifty × two hundred × 6～30.0 twenty-five × twenty-five × 0.6～2.0 four hundred and fifty × four hundred and fifty × 10.0～30.0 fifteen × thirty-eight × 0.6～1.5 three hundred × one hundred and fifty × 6～30.0 thirty × thirty × 0.6～4.0 four hundred and eighty × four hundred and eighty × 10.0～30.0 twenty × thirty × 0.6～2.0 three hundred × two hundred × 6～30.0 thirty-four × thirty-four × 1.0～2.0 five hundred × five hundred × 10.0～30.0 twenty × forty × 0.8～2.0 three hundred × two hundred and fifty × 6～30.0 thirty-five × thirty-five × 1.0～4.0 In addition, the specifications are as follows: twenty × fifty × 1.0～2.0 four hundred × two hundred and fifty × 8～30.0 thirty-eight × thirty-eight × 1.0～4.0 five hundred and fifty × five hundred and fifty × 10.0～40.0 twenty-two × thirty-five × 0.9～2.0 four hundred × three hundred × 8～30.0 forty × forty × 1.0～4.5 six hundred × six hundred × 10.0～40.0 twenty-five × forty × 0.9～3.75 four hundred and fifty × two hundred × 8～30.0 forty-four × forty-four × 1.0～4.5 seven hundred × seven hundred × 10.0～40.0 twenty-five × sixty-five × 1.0～2.0 four hundred and fifty × two hundred and fifty × 8～30.0 forty-five × forty-five × 1.0～5.0 eight hundred × eight hundred × 10.0～50.0 thirty × forty × 1.0～3.75 four hundred × three hundred × 8～30.0 fifty × fifty × 1.0～5.0 nine hundred × nine hundred × 10.0～50.0 thirty × forty-five × 1.0～3.75 four hundred × three hundred and fifty × 8～30.0 sixty × sixty × 1.5～5.0 one thousand × one thousand × 10.0～50.0 thirty × fifty × 1.0～4.0 five hundred × two hundred × 10～30.0 seventy × seventy × 2.0～6.0 thirty × sixty × 1.0～4.5 five hundred × two hundred and fifty × 10～30.0 seventy-five × seventy-five × 2.0～6.0 forty × fifty × 1.0～4.5 five hundred × three hundred × 10～30.0 eighty × eighty × 2.0～6.0 forty × sixty × 1.0～5.0 five hundred × three hundred and fifty × 10～30.0 eighty-five × eighty-five × 2.0～6.0 forty × eighty × 1.5～5.0 five hundred × four hundred × 10～30.0 ninety-five × ninety-five × 2.0～8.0 forty × one hundred × 2.0～5.0 five hundred × four hundred and fifty × 10～30.0 one hundred × one hundred × 2.0～8.0 fifty × sixty × 2.0～5.0 In addition, the specifications are as follows: one hundred and twenty × one hundred and twenty × 4.0～8.0 fifty × eighty × 2.0～5.0 six hundred × two hundred × 10～28.0 one hundred and fifty × one hundred and fifty × 6.0～10.0 fifty × one hundred × 2.0～8.0 six hundred × four hundred × 10～28.0 one hundred and eighty × one hundred and eighty × 6.0～12.0 sixty × eighty × 2.0～6.0 six hundred × five hundred × 10～28.0 two hundred × two hundred × 6.0～30.0 eighty × one hundred × 2.0～8.0 eight hundred × four hundred × 10～28.0 two hundred and twenty × two hundred and twenty × 6.0～30.0 one hundred and twenty × sixty × 2.5～10.0 eight hundred × six hundred × 10～28.0 two hundred and fifty × two hundred and fifty × 6.0～30.0 one hundred and twenty × eighty × 2.5～10.0 eight hundred × seven hundred × 10～28.0 two hundred and eighty × two hundred and eighty × 6.0～30.0 one hundred and fifty × one hundred × 2.5～12.0 one thousand × four hundred × 10～28.0 three hundred × three hundred × 8.0～30.0 one hundred and eighty × one hundred and fifty × 2.5～12.0 one thousand × five hundred × 10～28.0 three hundred and twenty × three hundred and twenty × 8.0～30.0 two hundred × one hundred × 4～12.0 one thousand × six hundred × 10～28.0 three hundred and fifty × three hundred and fifty × 8.0～30.0 two hundred × one hundred and fifty × 4～12.0 one thousand × eight hundred × 10~28 1. The upper rectangular tube can be used as straight seam rectangular tube and seamless rectangular tube, and special specifications can be customized. 2. Executive standard: GB / t6728-2002, ASTM, JIS or technical agreement. 3. Rectangular tube material: 235b, Q345 (B, c), 16Mn, 20#, 45#, 20Mn2.