San-RamonDN25 
San-RafaelHow 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 ℃.
Square pipe is an important pipe. Its application in various fields has different performance. According to its different performance we have carried out different transformation on the other pipe to ensure that the square pipe can be better used. We should make the right choice when purchasing. Below I will introduce the correct way of painting the lower pipe.
Overijse.Brinell hardness (HB), Rockwell hardness (HRC) and Vickers hardness (HV) are commonly used.
Be sure to select special for square pipe cutting.
.According to production, square tubes are divided into hot-rolled tubes, cold drawn tubes, tubes, pipe jacking, etc. According to the section shape, the square tube is divided into round and special-shaped. The special-shaped tube has many complex shapes, such as square, oval, angular, angular, melon seed, star and winged tube.
Steel with chromium content of more than 5% in steel and high corrosion of external medium (acid, alkali salt) is called square pipe. According to the condition in steel, square tubes can be divided into martensite ferrite, austenite and ferrite & mdash; Austenite type, precipitation hardening square tube, according to the standard gb3280 & mdash; 92 regulations, a total of 55 regulations.
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, 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.
Evaluation of test results after the test, the bending deformation of the sample is qualified if there is no crack or crack. The squash test rating square pipe produced by square pipe factory has been widely used. Of course, the current situation is inseparable from the strict control of square pipe factory in technology, which makes the development of steel pipe make a lot of contributions. Let's look at the specific purpose of the lower tube.
High density may not be obtained by simple pressurization, and insulation shall be carried out at the same time.
Requirements for samples samples can be taken from metal pipes with qualified appearance. Generally, sawing is adopted.
Where is it.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.
After aluminum deoxidation in molten steel, & omega; When (ALS) is 0.015% ~ 0.025%, calcium treatment can achieve better effect on the denaturation of Al203.
Square tube is in our reality
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,Overijse8 galvanized square pipe, 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.
Installation works.After the process of polishing, the surface effect of the square tube is quite good. The quality of the polishing process directly affects the external image of the square tube. Therefore, we must choose the appropriate polishing according to the above, and pay more attention to the polishing process of the square tube.
Pulling square tube: it is the process of pulling the die hole of the rolled metal blank (shape, tube product, etc.) into a section to reduce the length and increase. It is mostly used for cold processing.
Steel with chromium content of more than 5% in steel and high corrosion of external medium (acid, alkali salt) is called square pipe. According to the condition in steel, square tubes can be divided into martensite, ferrite, austenite and ferrite & mdash; Austenite type, precipitation hardening square tube, according to the standard gb3280 & mdash; 92 regulations,OverijseGeneral distribution of galvanized square pipe, a total of 55 regulations.
Overijse.Avoid contact with pollutants such as oil and copper when storing square tubes.
After the sample is flattened to the specified flattening distance h, remove the load and remove the sample.
Square pipe is the name of square pipe, that is, steel pipe with equal side length. It is made of rolled strip steel after process treatment. Generally, the strip steel is unpacked, crimped and welded to form a round pipe, then rolled into a square pipe from the round pipe