NashvilleGalva
HerediaDN25 gaUse classification square tubes are divided into: square tubes for decoration square tubes for machine tool equipment, square tubes for mechanical industry, square tubes for chemical industry, square tubes for steel structure, square tubes for shipbuilding, square tubes for automobile, square tubes for steel beams and columns, and square tubes for special purposes.
Performance index analysis of square tube - plasticity refers to the ability of metal materials to produce plastic deformation without deformation under load.
Nashville.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, 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, electrical silicon steel sheet, strip steel, seamless steel pipe, square pipe, welded steel pipe,Nashville42 galvanized pipe, metal products, etc.
The general delivery length of q355b square pipe is 4000mm-12000mm, mostly 6000mm and 12000mm. Q355b square tube is allowed to deliver short and non fixed length products not less than 2000mm, or in the form of interface tube, but the Demander shall cut off the interface tube when using it. The weight of short length and non fixed length products shall not exceed 5% of the total delivery. For q355b square tube with theoretical weight greater than 20kgm, it shall not exceed 10% of the total delivery. The bending degree of q355b square tube shall not be greater than 2mm per meter, and the total bending degree shall not be greater than 0.2% of the total length. The square tube is classified according to the production process: hot rolled seamless square tube, cold drawn seamless square tube, seamless square tube 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
Strength refers to the function that the square tube data is destroyed under static load (appropriate amount of plastic deformation or fracture), because the action form of load includes tension, compression, meandering shear and so on, compressive strength, flexural strength, shear strength and so on. There is often a definite connection between various strengths. In normal use, tensile strength is often used as the fundamental strength gauge.
). 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, the percentage of the length increased by the gauge length of the sample after breaking to the original gauge length is called elongation.
Great relationship. Large fillet radius, insufficient blank holder area, easy to produce unstable wrinkles; If the fillet is too small, the resistance of the material into the die will increase in the deformation process, which may lead to tensile cracking.
C. electric furnace steel: (a) electric arc furnace steel; (b) Electroslag furnace steel; (c) Induction furnace steel; (d) Vacuum consumable furnace steel; (e) Electron beam furnace steel.
Surface adhesion resistance is an important feature of square tubes. At present thus increasing the large tensile stress in the force transfer area, square tubes are mostly used for transportation, 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.
After the square tube is cut into a single square tube, the head and root of each batch of square tube shall be subject to strict first inspection. The mechanical properties, chemical composition, fusion condition, surface quality of square tube and NDT shall be carried out to ensure that the pipe making process is qualified before it can be officially put into production.
Preheating must be carried out before heat treatment of q355b square tube, so as to better ensure that there will be no many problems in the whole heat treatment process of q355b square tube, and the quality of q355b square tube will also be well guaranteed.
The inner and outer walls of the pipe shall retain the original surface without any processing.
Application process.Shot blasting is a high-speed rotating impeller that throws small steel shot or small iron shot out and hits the surface of the square tube at high speed, so the oxide layer on the surface of the square tube can be removed. At the same time, the steel shot or iron shot strikes the surface of the square tube at high speed, resulting in lattice distortion and deformation on the surface of the square tube and increasing the surface hardness
In recent years, large-diameter seamless square tube plays a good role in economic development. Because there are many types of large-diameter seamless square tubes, the continuous casting process of large-diameter seamless square tubes is also different. What are the specific steps of the continuous casting process of large-diameter seamless square tube? As the name suggests, square tube is a kind of square tube type. Many materials can form square tube body. Its medium is used for what purpose and where it is used. Most square tubes are steel tubes, which are unpacked, leveled, crimped and welded to form round tubes,NashvilleWelding video of galvanized square pipe, Then the round pipe is rolled into a square pipe, and then cut into the required length. Generally 50 square tubes per package are mostly in large specifications in terms of spot, and 10100.8 - 5~~ 50010-2 square tubes are divided into structural square tubes, decorative square tubes, building square tubes, mechanical square tubes, etc. according to their uses.
Square pipes are mainly used in engineering buildings, glass curtain walls, 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, water, gas, sewage, air Heating and other fluid transportation, fire fighting and support, construction and other fields.
Nashville.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, so that we can reduce the occurrence of defects.
The tensile test is to make q355b into a sample, pull the sample to fracture on the tensile testing machine, and then measure one or more mechanical properties. Usually, only tensile strength yield strength, elongation after fracture and reduction of area are measured. Tensile test is the basic mechanical property test of metal materials. Almost all metal materials have specified tensile test as long as they have requirements for mechanical properties. Especially for those materials whose shape is not convenient for hardness test, tensile test has become the only means to test mechanical properties.
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.