The common surface treatment of square pipe includes surface treatment， chemical treatment
The common surface treatment of square pipe includes surface treatment， shot blasting treatment， manual mechanical treatment and flame treatment. The treated will be separated. ~ Mpa compressed air entrains abrasives， and the nozzle sprays to the steel surface at high speed. The impact and friction of abrasives remove the oxide scale， rust and dirt on the steel surface，Q345B square tube and make the steel surface reach a certain roughness.
3The cutting surface of the square tube shall be true circle，160 seamless square tubeBasic types of and the cutting line shall be at right angles to the axis of the square tube. Excessive force is the reason for cutting the square tube into flat or oval， so the square tube should be cut with appropriate force.
eThe reason why the surface of fake and shoddy materials is easy to crack is that its blank is adobe with many air holes. During the cooling process， the adobe has cracks due to the action of thermal stress， and there are cracks after rolling.
the blank holder area is insufficient， which easily leads to instability wrinkle; If the fillet is too small， 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.
ZLower-VegaApplication of square tube products: for mechanical equipment，Q345B square tube solar energy equipment， automobile parts， bridge ground pile， guardrail and ship internal structure.
ErSquare tube failure. When the pipeline is erected， it is necessary to do a good job or directly use the square pipe. The reason for the corrosion of the pipeline is that the layer of the pipeline is damaged. Once the layer is separated from the pipe surface， it will naturally cause failure.
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. Lets understand how to store square tubes correctly.
In the standard of qb square tube，Q345B square tube such as qb square tube， only tensile test is specified. In particular，160 seamless square tubeBasic types of the new portable surface Rockwell hardness tester and pipe Rockwell hardness tester can quickly and accurately test the hardness of stainless steel plate， stainless steel strip and qb square tube as thin as .mm， which makes it easy to solve the problems that were difficult to solve in China in the past.
yB. converter steel: (a) acid converter steel; (b) Basic converter steel. Or (a) bottom blown converter steel; (b) Side blown converter steel; (c) Top blown converter steel.
VBrinell hardness， Rockwell hardness and Vickers hardness are commonly used.
KQuality departmentNow in many construction projects， we can see the shadow of qb square tube， because qb square tube is quite hard in hardness， and the performance and quality of deformation， stamping，Square pipe, square rectangular pipe, seamless square pipe, galvanized square pipe, galvanized pipe - Wuxi Jiahang metal products Co., Ltd cutting and other processing are based on hardness， which is also the guarantee of mechanical properties. Based on the above， it is very important to test the hardness of qb square tube.
cGMechanical polishing: after processing， the parts have good levelness， short gloss， dull and rusty. Suitable for processing simple parts， medium and small products.
Under our actual investigation， Fangguan has a brand-new development
The banding caused by component segregation is difficult to be eliminated by heat treatment. Generally， normalizing can reduce this segregation to a certain extent. Generally normalizing can correct the segregation to the allowable level. If the banding is serious， it can be improved by multiple normalizing. It is reliable to conduct high-temperature diffusion annealing first and then normalize again， which can completely eliminate the strip， but the cost will be very high， which is difficult to achieve for the steel plate due to the surface quality.
Development CurriculumpQb square pipe for mining fluid transportation， Standard No.: gbt-. The representative material is Q grade B steel， which is mainly used for coal mine air pressure， drainage and vertical shaft gas drainage straight seam qb square pipe.
NThe strength， plasticity and angle discussed later are the machine function indicators of metal under static load. In practice， many mechanical machines are under repeated load， and the whole opportunity is tired in this environment.
Banded due to improper hot working temperature， that is， when the hot working stop forging temperature is in the phase zone (between， and ) ferrite precipitates in bands from austenite along the metal flow direction， and the undigested austenite is cut into bands. When it is cooled to a， the banded austenite is transformed into banded pearlite. This can be improved or eliminated by increasing the final rolling temperature， increasing the forging ratio， diffusion annealing and normalizing.
qQb square pipe for mining fluid transportation， drainage and shaft gas drainage.
qENow， which is completely inseparable from the manufacturers hard work in technology. I believe that the Fangguan market will be better and better in the future.
The strength， plasticity and angle discussed later are the machine function indicators of metal under static load. In practice， many mechanical machines are under repeated load， and the whole opportunity is tired in this environment.