process test and process analysis
According to the welding specification, 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.
The square tube adopts the electric contact pressure gauge to press down the pressure of the oil cylinder on both sides of the conveyor to ensure the smooth transportation of the strip steel.
Havana.Comprehensive classification ordinary steel A. carbon structural steel: (a) Q19 (b) Q215 (b); (c) Q235(C)； (d) Q255( B)； (e) Q275.
When cutting, please fix it with square tubes such as vise, and then cut it after it is fixed.
.Ordinary carbon steel is divided into Q19 Q2 q23 SS400, 20# steel, 45# steel, etc.
Square pipe, also known as square and rectangular cold-formed hollow section steel, is referred to as square pipe and rectangular pipe for short. The allowable deviation of wall thickness of square pipe is f and J q355b respectively. When the wall thickness is no more than 10mm, rectangular pipe, seamless square pipe, galvanized square pipe, galvanized pipe, 20-year-old brand, price advantage and quality guarantee! When the wall thickness is greater than 10mm, it is plus or minus 8% of the wall thickness, except for the wall thickness of corners and weld areas.
Solid bending, as the name suggests, is to compact the bending. During real bending, the inner and outer rollers and the inner and outer walls of the pipe blank are compacted in both directions.
Great relationship. Large fillet radius, the resistance of the material into the die will increase in the deformation process, and the material is not easy to move and transfer inward, thus increasing the large tensile stress in the force transfer area, which may lead to tensile cracking.
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 is formed by external control or internal control roller.
Trustworthy.Classification of wall thickness square tubes are divided into super square tubes, square tubes and thin-walled square tubes according to wall thickness. Gbt6728-200gbt6725-200gbt3094-2000, JG 178-200, ASTM A500, JIS g34en10210 or technical agreement.
Performance index analysis of square tube - strength refers to the performance of metal materials under static load. Since the action modes of load include tension, compression, bending and shear, the strength is also divided into tensile strength, compressive strength, flexural strength and shear strength. There is often a certain between various strengths. Generally, tensile strength is used as the basic strength indicator.
You can really feel that the square tube is widely used in the development, and q355b square tube factory continues to extend in the technical level, which makes the current square tube develop more widely.
In the process of processing, the processing temperature is the key. Professional square tube, square tube seamless square tube, galvanized square tube and galvanized tube have advanced technology, strict detection, more affordable price and more preferential price. Consultation is welcome. It must be noted that the blank heating should be uniform. Perforation has a great impact on the quality. The perforation temperature of blank varies according to different materials, generally around 1200 ℃.
Information recommendation.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, and the original characteristics have changed. However, 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.
The square tube for fluid transportation (gbt8163-199) is a general square tube for transporting water, oil, gas and other fluids.
Degrease.
Havana.HDPE plastic square pipe made according to the properties of square pipe has the advantages of light texture, high strength, good resistance, low water resistance, low cost and corrosion resistance. Its service performance and economic benefits far exceed reinforced concrete pipe and general specification iron pipe. It is an updated product of engineering pipe.
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.
Dimensional stability for high-precision square tubes the required accuracy is high, so the dimensional stability must be maintained. Due to straightening in the air and slow cooling speed, it has the effect of stabilization and will increase the number of residual square tubes in the, so it must be cooled; Reduce quenching deformation because the square tube is slender, it is easy to deform during quenching, so its deformation must be strictly controlled. Heat treatment is a key process. In the process of quenching and cooling, the cold plasticity shall be corrected in time, which is a key step to ensure the improvement of its qualification rate. Therefore, hot bath quenching or cooling in oil for a fixed time shall be carried out to propose thermal correction.