Except for the thickening of the wall thickness, the corner size and edge flatness of the square pipe are uniform
Hardness test is to determine the hardness of seamless q355b square pipe by slowly pressing a hard indenter on the sample surface according to the specified conditions and then testing the indentation depth or size.
Daniel-Flores.Compared with other welding, mainly because of the exothermic reaction, the material only needs to be heated below the melting point
To sum up, improving the quality level of square tube is the key to ensure the service life of die. Therefore, when the economic cost and equipment conditions permit, the quality level of square tube, including surface quality and internal quality, should be improved as much as possible by using more mature process measures.
.Stainless steel q355b square pipe for mechanical structure, automobile etc. are mainly used for mechanical parts and structural parts such as machinery, bicycle, hotel and restaurant decoration.
Requirements for samples samples can be taken from metal pipes with qualified appearance. Generally, sawing is adopted.
When we understand the causes of defects in the drawing process of q355b square tube, we should constantly improve the technology in the subsequent production process, we require that the ratio of waist thickness to height of H-section steel should not be less than 145. For H-section steel used as column, its economy is expressed by the ratio of torsion radius to its mass.
Square tubes have different functions and different characteristics. Square tubes of various specifications square rectangular tubes, seamless square tubes, galvanized square tubes and galvanized tubes are welcome to waste merchants, industries, enterprises and power departments to visit and negotiate! Oxidation will also occur on the surface of square tubes after long-term use. What should we do if oxidation occurs? Let me give you a detailed introduction on how to remove square tubes Oxide scale.
The square tube represents the large capacity of the metal material under the action of tension, and the calculation formula is: where: FB -- the strong force borne by the sample when it is broken, n (Newton); So -- original cross-sectional area of sample, mm2. Yield point (& sigma; s) the stress of metal material with yield phenomenon when the specimen can continue to elongate without increasing (keeping constant) the force during the tensile process, which is called the yield point.
Where to sell API.Of course, since the q355b square tube material is selected as the base metal, it generally has special purposes, so the welding materials will not be selected casually. It is better to use it according to the welding material manual. If the welding rod manual says that the base metal should be preheated, it should be preheated. Because the welding materials are not used according to the manufacturer's instructions, the weld performance will be greatly reduced.
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.
Cold formed hollow section steel (American Standard) for cold pressed Q345B square tube (national standard) structure carbon steel cold-formed circular section and pressure welded Q345B square tube and seamless Q345B square tube (European standard) non alloy fine grain cold formed welded hollow structural profile (Japanese standard) angle steel Q345B square tube for general structure galvanized q355b square tube for low pressure fluid transmission, Standard No.: gbt3091-2008. Representative materials: q235q235bq345b, etc. it is mainly used to transport water, gas, air, oil and water or steam. It is a special product manufacturing enterprise integrating R & D, and service. It has long been a professional square tube, square tube, seamless square tube, galvanized square tube and galvanized tube. Its purpose is only limited to general low-pressure fluid.
The first is the influence of external conditions. It mainly depends on the medium characteristics and temperature around the square pipe and whether the medium around the pipe is corrosive. Because the corrosivity of the medium is closely related to the microorganisms contained in the soil. And if it is a long-distance pipeline, the soil environmental properties are more complex. In addition, the temperature of the environment where the pipeline is located will also affect the corrosion of the square pipe. If the temperature is high, the corrosion speed will also be accelerated, while if the temperature is low, the corrosion speed will be slowed down.
Recommendation and consultation.The square tube will be tested in many aspects of its performance in the process. Each test is for the square tube to have a good performance in practical application. So what are the different properties of square tubes? Next, I'll introduce the characteristics of the lower tubes in terms of mechanical properties.
The pressurization size and time are the key to the success or failure of welding. If the square tube synthetic material is not pressurized, a large number of pores will be caused due to the pores of the material itself and the gas generated in the reaction. It is not allowed to leave the reactants in the weld, so it must be densified, usually pressurized during the reaction.
It is feasible to use the theory to calculate static structures such as warehouses, houses and bridges, but it is not suitable for moving components such as wheels. At this time, people often use the plastic theory. The research of the plastic theory can be traced back to 1914. In 1975, the European Design Association formulated a plastic design code, which is mainly used for static load plane beams and frame structures subjected to bending stress The solution is as follows: for high-rise buildings, more detailed calculations are needed.
Daniel-Flores.Process flow of square tube drawing: because the size of the die hole of the square tube drawing is smaller than the outer diameter of the tube in front of the drawing, in order to make the front end of the square tube pass through the die hole smoothly, so that the clamp jaw of the drawing trolley can the head of the square tube, it is necessary to sharpen the head of the square tube before drawing. Therefore, the end of the square tube with a fixed length should be heated in the slit heating furnace, It is generally 150 ~ 200mm, and the heating temperature is between 750 ~ 900 ℃ according to different wall thickness. Then use 75 ~ 300kg air hammer to sharpen and grind the head of the square pipe. Generally, the square pipe with diameter less than 22mm can be sharpened by rotary forging hammer or roll forging machine.
The modification of Ca, rare earth and other trace elements on inclusions changes the structure, morphology and physical properties of inclusions in steel, spheroidize and refine inclusions in steel, so as to improve the mechanical properties of square tubes.
Common specifications of square tube: ~ 5 18 & times; 18× 0.4～ 5 20× 20× 0.4～ 5 25× 25× 0.6～ 0 30× 30× 0.6～ 0 34× 34×0～ 0 35× 35×0～ 0 38× 38×0～ 0 40× 40×0～ 5 44× 44×0～ 5 45× 45×0～ 0 50× 50×0～ 0 60× 60×5～ 0 70× 70×0～ 0 75× 75×0～ 0 80× 80×0～ 0 85× 85×0～ 0 95× 95×0～ 0 100× 100×0～ 0 120× 120×0～ 0 150× 150×0～ 0 180× 180×0～