San-RamonDN25 
San-RafaelHow Compared with other traditional pipes, square pipe supply steel pipe has lighter raw materials, high strength, good resistance can withstand high internal pressure, sensitive application, and can get used to messy or bad geological conditions.
). Upper yield point (& sigma; Su): the large stress before the yield of the sample occurs and the stress decreases for the first time; Lower yield point (& sigma; SL): the small stress in the yield stage when the initial instantaneous effect is not considered. The calculation formula of yield point is as follows: where: FS -- yield force (constant) in the tensile process of the sample, n (Newton) so -- original cross-sectional area of the sample, mm2. Elongation after fracture (& sigma;) in the tensile test, oil, gas and other fluids.
With the progress of the times square tubes are used in more and more fields, and their scope of use is obviously increasing, which makes us have many kinds of square tubes. At this time, we need to store square tubes reasonably. Customers should also learn to arrange reasonably when storing square tubes. Let's understand how to store square tubes correctly.
.Material classification: square pipe is divided into ordinary carbon steel square pipe and low alloy square pipe.
Square pipe is a square steel pipe cold drawn from seamless steel pipe which is not a straight q355b square pipe, and q355b square pipe, also known as welded pipe, is a square pipe welded by steel plate or strip steel after crimping. Q355b square tube has the advantages of simple production process, high production efficiency, many varieties and specifications and less equipment. The commonly used materials are Q235A and Q235C.
Functional index analysis of square tube - angular plasticity refers to the power of plastic deformation (permanent deformation) without destruction of square tube data under load.
The common surface treatment of square pipe includes surface treatment, chemical treatment, shot blasting treatment, manual mechanical treatment and flame treatment. The treated will be separated. 4 ~ 6Mpa compressed air entrains abrasives, and the nozzle sprays to the steel surface at high speed. The impact and friction of abrasives remove the oxide scale, rust and dirt on the steel surface, and make the steel surface reach a certain roughness.
With the progress of the times and the faster and faster economic development, the places where large-diameter seamless square tubes are used are becoming more and more popular
Before gas cutting, remove the dirt and grease on the steel surface, and leave a certain space below to facilitate the blowing out of slag. During gas cutting, the movement of the cutting torch shall be kept at a uniform speed. The cutting surface should be 2 ~ 5mm away from the tip of the flame core. If the distance is too close, the edge of the cut will melt, and if it is too far away, the cutting will be interrupted easily due to insufficient heat.
Variable cost.Today, with the development of the world, all fields are coming rapidly, which makes the demand for square tube higher and higher, and the requirements of customers for square tube higher and higher. Now we are studying a new square tube. The following mainly introduces the performance of square tube in tensile strength.
At present, square tubes also have many good properties, strong corrosion resistance and heat resistance, and are widely used in many scientific and technological fields. Therefore, even so, wise people still do not stop studying the surface adhesion resistance of square tubes. Square tubes in the future will have better performance and make more important contributions to development.
Q355b square pipe for mining fluid transportation,ChirpanGalvanized square pipe direct selling, Standard No.: gbt14291-2000. The representative material is Q235 grade B steel,ChirpanHow many galvanized pipes per ton, drainage and vertical shaft gas drainage straight seam q355b square pipe.
When cutting the square tube, there will be deformation, uneven incision and crack of the incision. What should we pay attention to when cutting the square tube and how to operate it? Today, I will introduce some problems that should be paid attention to when cutting the square tube. If the correct operation will make the square tube cutting work very smooth, please use a rag or cloth to clean the oil on the surface of the square tube Sundries or soil shall be completely clean.
Meticulous workmanship.Be sure to select special for square pipe cutting.
A. square tube structural steel: (a) high quality carbon structural steel; (b) Alloy structural steel; (c) Spring steel; (d) Easy cutting steel; (e) Bearing steel; (f) High quality structural steel for specific purposes.
The q355b square tube rolled from the strip steel through process treatment is generally to unpack, flatten, then roll the round tube into a square tube, and then cut it to the required length. Nowadays the forming of q355b square tube has solid bending and empty bending. The bending degree of q355b square tube shall not be greater than 3mm per meter,Chirpan50 price of galvanized square pipe, and the total bending degree shall not be greater than the actual bending of the total length. As the name suggests, the bending is compacted, and the internal and external rollers and the internal and external walls of the tube blank are compacted in both directions during the actual bending.
Chirpan.When the square tube is covered, the surface of the square tube shall be ventilated to avoid the collection of water vapor on the surface due to difficult volatilization.
However, there is a large rate of end in the application of steel pipe, which is mainly due to the trouble of internal and external treatment. The first question is very crucial, and the external quality is good or bad
Today, with the development of the world, all fields are coming rapidly, which makes the demand for square tube higher and higher