Classification of surface treatment square pipe is divided into hot-dip galvanized square pipe, electro galvanized square pipe, oiled square pipe and pickled square pipe according to surface treatment.
In order to ensure the stability of the perforation performance and chemical properties of the billet of the square tube, the technical regulations shall be strictly implemented in the operation of the circular furnace, the operation of the heating furnace shall be frequently, the abnormal conditions shall be handled in time and recorded, 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.
According to the welding specification, process test and process analysis it is determined that the butt weld of Q345B square pipe adopts double-layer CO2 gas shielded welding. H08Mn2SiA, 2mm welding wire for welding material; The shielding gas is pure CO2 gas. The welding current of layer weld is 200 ~ 250A, and that of the second layer is 240 ~ 320A; The arc voltage is 24 ~ 26V. The process requirement is that the layer weld must be fully welded to ensure good back forming; The welding current, arc voltage, wire feeding speed and welding speed can be adjusted according to the equipment model.
.Square tube is a kind of square tube type. Many materials can form square tube body. It is used for what purpose and where. Most square tubes are steel tubes, mostly structural square tubes, decorative square tubes and building square tubes. Square tubes can be divided into seamless and welded joints. Seamless square tubes are formed from seamless circular tubes.
After time,HerediaGalvanized pipe, the workpiece forms an oxide film with a fixed thickness and presents various colors. Chemical oxidation method is to form various film colors in a specific solution at temperature and time; Because of the law & rdquo; More, but to maintain the color of the product, the reference electrode must be used. Electrochemical method is to form the color of chloride film with fixed thickness in specific electrolyte at temperature, voltage and time. This process is mature and widely used. Ion implantation method is to vaporize ions in vacuum and deposit them on the surface of q355b square tube, such as watch case on the market. The golden color of watch strap adopts this process technology, which is suitable for mass production. The process of gas phase cracking is more complex and less used in industry. Square tube has long been widely used in mechanical industry. When the square pipe is cut automatically, when the square pipe is hoisted to the gas cutting platform, the guide rail shall be placed on the plane of the cut pipe, and then the cutting machine shall be placed on the guide rail gently.
Surface adhesion resistance is an important feature of square tubes. At present, square tubes are mostly used for transportation, so the adhesion resistance makes square tubes not stick during transportation.
The normal process flow is as follows: the round steel is perforated to form a tube embryo, then pickling is carried out, the black skin on the outer surface is washed off, and then grinding is carried out. After passing the inspection, the rolling mill or cold drawing and cold drawing are carried out. Annealing is required for wall reduction but not for air drawing. After forming, and pickling is tested and stored in the warehouse. Basically annealing and straightening are carried out, these are the processes. Better manufacturers will perform whitening treatment during annealing to make the surface treatment more beautiful. The narrow blank of square pipe can produce welded pipe with larger diameter, and the blank of the same width can also produce welded pipe with different diameter. However, compared with the straight seam square pipe with the same length, the weld length increases by 60%, and the production speed is low. Square pipes with large or thick diameter are usually made of steel blank directly, while small welded pipes and thin-walled welded pipes only need to be directly welded with steel strip. Then after simple polishing, wire drawing is OK. Therefore, straight seam welding is mostly used for relatively welded pipes, and spiral welding is mostly used for large-diameter welded pipes.
Spraying (throwing) derusting spraying (throwing) derusting is that the high-power motor drives the spraying (throwing) blade to rotate at high speed, so that the steel sand, steel shot, iron wire section, which can not only completely remove rust, oxides and dirt, but also the square tube under the violent impact and force of abrasives,HerediaLined plastic hot dip galvanized steel pipe, It can also achieve the required uniform roughness.
Cutting: 1 to be fast, no teeth, or whether the cutting line is flat, the starch taste of oil affects the quality of dishes. First choose to cut potatoes with less sharp bottom, so when you cut, the plasticity and quality of q355b square tube forged are relatively good, so general manufacturers will forge q355b square tube, professional square tube, rectangular tube, seamless square tube, galvanized square tube, galvanized tube to ensure quality, service and quality. Your satisfaction is our pursuit! Welcome to inquire. So now there are many applications of q355b square tube.
The detailed steps for cutting square tubes are as follows: what is used for cutting square tubes? Seamless square tubes can only be processed successfully after certain steps in processing and engineering. The first step that must be experienced in processing is to cut seamless square tubes. There are various cutting methods for seamless square tubes. Today, I'd like to introduce a method of cutting seamless square tubes with slices, It is recommended to cut according to the following provisions: select a uniform surface to select potatoes; The large diameter is not too much, or they don't cut well; B choose sharp seeds, slightly larger ones, and small needles. Sometimes large potatoes are not long enough; C. select flat, it will be cut continuously; When the texture is light cut, the die-cutting board will follow.
How to reduce the amount of oxide scale is the key to the heating operation of seamless square tube. Especially when it's hot. Starting from the service life of tools and the surface quality of pipes, the requirements are more stringent. For example, hot furnaces are divided into heating furnace and reheating furnace according to their functions; The former is used to heat the blank from normal temperature to processing temperature; The latter is used to reheat the blank to the necessary processing temperature during processing.
Performance index analysis of square tube - impact toughness the load acting on the part at a great speed is called impact load, and the ability of metal under impact load is called impact toughness.
query.The standard number of spiral square pipe (standard of the Ministry of petroleum) for low pressure transmission is syt5037-2008. The representative materials are q235bq345b and other carbon steel materials. It is mainly used for low-pressure transmission of water, oil, natural gas, heating and other pipelines.
Square tube is an essential material for the construction and Realization of industrialization. It is widely used and has a wide variety. According to different section shapes, square tube is generally divided into sections, plates, pipes and metal products. In order to facilitate the production, ordering and supply of square tube and do a good job in operation and management, it is also divided into heavy rail, light rail, large section steel, medium section steel, small section steel and square tube cold bending Section steel, high-quality section steel, wire rod, medium and thick steel plate, sheet steel, strip steel, seamless steel pipe square pipe, welded steel pipe, metal products,Heredia16Mn hot dip galvanized square pipe, etc.
The q355b square tube protective layer thickness detector is used to measure the actual thickness of the seamless q355b square tube protective layer on site. It is required that the actual thickness of the seamless q355b square tube protective layer of the seamless q355b square tube shall not be lower than the design value. When the requirements are not met the protective layer of seamless q355b square tube can be chiseled and measured.
Heredia.All seamless q355b square tubes shall be tested for mechanical properties. Mechanical property tests are mainly divided into two categories: tensile test and hardness test.
When cutting the sample, the surface of the sample shall not be damaged, the properties of the metal shall not be changed due to heating or cold processing, and the edges at the section shall be rounded.
The performance advantage of square tube after calcium treatment requires not only high strength, but also good machining performance. For sulfur-containing square tube, sulfur can improve the machinability of steel, so the sulfide inclusion in square tube is the key to determine the quality of steel. Sulfur mainly exists in the form of MNs in the steel. The single MNS inclusion is light black strip. The inclusion with this morphology cuts off the continuity of the steel matrix and makes great differences in the anisotropic properties of the steel. Calcium treatment of molten steel can inhibit the formation of MNS inclusions and combine MNS with al20 CAS to form composite spindle inclusions. Such inclusions can improve the machinability of steel and avoid the adverse impact of MNS inclusions on the properties of steel.