In the trend of the times, we will change with the changes of the times, we will the use of the square tube,San-Rafael-AbajoPrice list of galvanized pipe, so that we can use the square tube more in future production. Next, let's introduce the difference between carbon steel and square tube.
Various treatments are summarized as follows: high temperature oxidation method is to immerse the workpiece in a specific molten salt and maintain a fixed process temperature
San-Rafael-Abajo.When sand blasting or manual mechanical derusting is used, due to the falling off of the oxide scale of the galvanized square pipe, the metal on the surface of the galvanized square pipe is directly exposed in the air. If a primer is not applied in time, the surface of the galvanized square pipe is easy to rust again, affecting the adhesion of the paint film. I am engaged in all kinds of square tubes, square rectangular tubes, seamless square tubes, galvanized square tubes, galvanized tubes and other materials all year round. I operate in good faith. Welcome to call! As the paint is a time-effective material, the overstock of inventory is easy to expire. Therefore, the main indexes of the paint must be rechecked before use, and the paint can be used only when the results meet the standards.
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.
.0 200× 200×0～ 0 220× 220×0～ 0 250× 250×0～ 0 280× 280×0～ 0 300× 300×0～ 0 320× 320×0～ 0 350× 350×0～ 0 380× 380×0～ 0 400× 400×0～ 0 420× 420×0～ 0 450× 450×0～ 0 480× 480×0～ 0 500× 500×Standard treatment of steps for preventing oxidation of 0 ~ 0 square tube square tube is a kind of metallic maintenance. The main components are iron and zinc. It is easy to have redox reaction in the air. Once the reaction occurs, many new substances have taken place,San-Rafael-Abajo6. What is the outer diameter of galvanized pipe, and the original characteristics have changed. However, in order to maintain the original relevant characteristics, anti-oxidation treatment is required. The direct reason is to prevent the square tube from reacting with the oxygen in the air, which is the way to isolate the oxygen in the air. Today, this article makes a relatively standardized treatment on the relevant steps to prevent oxidation of square tubes: the key depends on what kind of antirust paint you use. 1. If you use epoxy zinc rich or iron rich antirust paint, you can directly spray fluorocarbon paint on it; 2 if alkyd antirust or red lead is used, it shall be cleaned with paint remover and sprayed with epoxy zinc rich or iron rich antirust paint again before fluorocarbon paint can be sprayed.
It is forbidden to degrease the oil square pipes and pipe fittings in the direct production concentration unit, air separation unit, oil refining and chemical engineering according to the design requirements. The purpose of degreasing is to prevent the transported or stored materials from being contaminated by grease or organic matter; Avoid mixing transported or stored materials with grease or organic matter; Oil content to ensure the activity of the catalyst; The content of oil and organic matter to ensure the purity of the product. The installed square pipe shall be disassembled into pipe sections for degreasing. Pipes that cannot be disassembled after installation shall be degreased before installation. Square pipes with obvious oil stains or serious corrosion shall be cleaned by steam purging, sand blasting or other methods before degreasing.
It is learned from the authority that if there is dirt on the outer surface of the square pipe during degreasing, it can be washed with purified water and dried naturally, then soaked with degreasing agent with a dry cloth to remove the oil, and then dried in the open air. When degreasing the inner surface of the opposite pipe, the end of the pipe can be tightly blocked with a wooden plug or closed with other. The degreasing solvent with the volume of 15% - 20% of the pipe from the other end shall be sealed with a wooden plug, placed in a flat and clean place or on a workbench with sleepers for 60-80min, and the pipe shall be rotated every 20min. If degreasing is required for stainless steel elbow, degreasing solvent shall be appropriately added to make it fully soaked. After degreasing, pour out the solvent in the pipe, dry the pipe with exhaust fan, or dry it with oil-free compressed air or nitrogen, we should choose them according to their characteristics. We have different types of square tubes in different fields. What is the difference between the characteristics of square tubes and ordinary steel tubes? Let's introduce them today to let us have a deeper understanding of each other's tubes.
Hardness Q235B square hardness is a pointer to measure the hardness and softness of metal materials. At present, the hardness method is commonly used to measure the hardness in production. It uses the indenter with fixed geometry to measure the hardness value of the metal material surface tested under fixed load according to the degree of hardness.
Square pipe, the steel pipe whose ratio of outer diameter to wall thickness is less than 20 is called square pipe. At present, the square tubes produced by q355b square tube factory are mainly used in tap water engineering, petrochemical industry, chemical industry, agricultural irrigation and urban construction. For transportation: water supply and drainage. For gas transmission: gas, steam and liquefied petroleum gas. do
superior quality.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.
Square pipes are mainly used in engineering buildings, glass curtain walls, door and window decoration, steel structures, guardrails, machinery, automobiles, household appliances, shipbuilding containers, electric power, agricultural construction, agricultural greenhouses bicycle frames, motorcycle frames, shelves fitness equipment, leisure and tourism, steel furniture, various specifications of oil casing, oil pipes and pipeline pipes, water, gas, sewage, air Heating and other fluid transportation, fire fighting and support, construction and other fields.
Square tube is the main type of square tube. It is also very popular in the square tube market. There are many people doing this kind of thing, so there are many in the competition. The future market potential is huge. We should grasp this information well. In addition, we must learn about relevant maintenance and repair!
The quality of the solid square tube after the square tube formwork removal and curing can be tested according to the requirements and the following ways: use a magnifying glass to observe whether there are non external force cracks on the structural surface of the solid seamless q355b square tube. When non external force cracks appear on the surface of q355b square pipe, the crack width on the structural surface of ordinary q355b square pipe shall not be greater than 0.20mm.
ranking.Performance index analysis fatigue of square tube the strength, plasticity and hardness discussed above are the indicators of the mechanical properties of metal under static load. In fact, many machine parts work under cyclic load, under which fatigue will occur.
Square tube, modified square tube, square tube, Q345B square tube and hot-rolled square tube are qualified in quality inspection. The manufacturer adopts advanced equipment to ensure the quality of each product. Magnetic flux leakage testing for surface defects of square tubes is very similar to magnetic particle testing for square tubes and its scope of application, sensitivity and reliability are stronger than magnetic particle testing. Indirect square forming process the traditional forming process of cold-formed square pipe is to gradually roll the hot-rolled steel coil multi stand forming unit into round pipe at room temperature, and then the shaping unit will roll the round pipe into square pipe, which is called indirect square forming process. The traditional roll forming process uses the method of fixed bending point position and variable bending radian to complete the corner forming of pipe blank, which is suitable for rolling small and medium-sized products. Rolling with this process & ldquo; Superb & rdquo; Square tube will show its inherent defects. Because the roll work in the bending process of this process is always concentrated at the point, excessive stress concentration often shows microcracks in the bending process of profiles, which will lead to cracking in serious cases. The products with such defects have serious consequences when they are used in building steel structures. The study of the broken square tube column in the Hanshin earthquake in Japan shows that the corner microcrack is the main cause of the square tube fracture. At the same time, due to the different forming bending radians of products with different wall thickness, the universality of rolls is limited. The large-size cold-formed square tube used in the process adopts the advanced & ldquo; Direct Square & rdquo; The production process is to directly roll the hot-rolled steel coil into a square and rectangular shape at room temperature.
After perforation, the round tube blank is successively rolled by cross rolling, continuous rolling or rolling. Take off the pipe after sizing. The conical drill bit of the sizing machine rotates into the steel embryo at high speed to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the sizing machine bit. After sizing, the steel pipe enters the cooling tower for water spray cooling. After cooling the steel pipe will be straightened. After straightening the steel pipe
San-Rafael-Abajo.After isothermal quenching, qq355b square tube will have excellent rolling fatigue characteristics and corrosion resistance. Wear resistance,San-Rafael-AbajoGalvanized round pipe with pipe, fracture toughness, impact toughness and bending strength. Therefore, in the subsequent production and application, qq355b square tube will be used as the material of rolling mill flap ball screw. The qq355b square tube of case hardening steel also has the surface compressive stress characteristics obtained by heat treatment, and its application range is expected to be improved and expanded.
Forging has many advantages in improving the plasticity of q355b square tube and improving the quality of steel, because the cast state of forged metal can be broken when forging q355b square tube. Therefore, there are forging workshops in some q355b square tube factories.
General square pipes are stacked outdoors, it will cause oil and gas leakage, which will not only interrupt transportation, but also pollute the environment, and may even lead to fire and cause harm.