Changsha Xiangjia Metal Materical Co., Ltd.

Bearing pressure calculation formula for precision bright   square tube 1. The calculation method for the wall thickness of the precision bright square tube to withstand the pressure (different materials of the precision bright square tube has different tensile strength) pressure = (wall thickness * 2 * steel tube material tensile strength) / (outer diameter * coefficient) 2. The calculation method for calculating the wall thickness of the precision bright square tube outer diameter and pressure: 　　 Wall thickness=(pressure*outer diameter*factor)/(2*steel tube material tensile strength) 3. The calculation method of the pressure coefficient of precision bright square tube: 　　  pressure P<7Mpa    coefficient S=8 　　7<pipe pressure P<17.5Mpa     coefficient S=6 　　 pressure P>17.5Mpa      coefficient S=4

Stainless steel flange   designs the flange body and the socket as an integral structure, which avoids leakage due to the inability to align the welding port during welding and have a good sealing performance. The methods to deal with rust on stainless steel flanges: 1. Clean with emery cloth and wire brush. 2. Using a tungsten steel shovel to shovel away large areas of rust. 3. Using a file to remove welding slag and other protrusions and various burrs. 4. Using a scraper and a wire brush to remove the rust on the corners. 5. Using a clean cloth, or a cloth dipped in solvent to clean and apply primer in time. 6. Note that the toughness coating film that has not expired can be retained, and the surface of the old paint should be roughened with emery cloth, and the defect of the coating film should be polished into an axe shape, and the paint should be painted directly after cleaning.

Thick-walled   LSAW steel pipe   is outer diameter to wall thickness ratio is less than 20. They are used as petroleum geological drilling pipes, petrochemical cracking pipes, boiler pipes, bearing pipes, and high-precision structural pipes for automobiles, tractors, and aviation etc. The biggest difference between thick-walled LSAW steel pipe and thin-walled LSAW steel pipe is the thickness of the steel pipe wall. Generally, thin-walled LSAW steel pipes is wall thickness/pipe diameter <0.02. Thick-walled LSAW steel pipe is wall thickness/pipe diameter ＞0.02. Thin-walled steel pipes are used for pipelines. Thick-walled LSAW steel pipes are mostly used in blanks for hollow parts, pressure-bearing and important pipelines.

The material of   SSAW steel pipe   is Q235 A, Q235B, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, 16Mn, 20#, Q345, L245, L290, 40#, 60#, X42, X46, X70 , X80. Different usages of SSAW steel pipe, the raw materials is different. For example: the material required for SSAW steel pipe used for piling is Q235B SSAW steel pipe used for water pipeline, the material should be Q235B SSAW steel pipe that used in oil and gas industry, the material is Q235B and Q345B.

There are many tricks to sell goods in market, so as to steel pipe. So that it is important to know something about the things you are going to purchase. And about to   LSAW steel pipe , you have some thing to take care: 1. Keep an instrument. It because when the wall thickness of the steel pipe is not get to the standard, the supplier may hammer shield the mouth end of the steel pipe to make it looks good. At this situation, you will need an instrument to measure it. 2. LSAW steel pipe are used as seamless steel pipes. There is only one weld seam for LSAW steel pipe. Using the machine to polish the whole steel pipe, till it looked as seamless without gap. 3. Another way to seamless LSAW steel pipe is thermally expanded steel pipe. After the expansion, the weld seam is invisible, but there is lead powder inside the steel pipe, and there are burn marks on the pipe, which needs to be checked carefully.

Galvanized elbow  is a kind of elbow, it is a layer of zinc on the elbow. The layer of zinc can improve the corrosion resistance of the elbow. Galvanized elbow are divided into electro-galvanized elbow and hot-dip galvanized elbow. What are its characteristics? 1. Light weight. The density of galvanized elbow is 10% that of elbow. 2. Impact strength. This performance is better than ordinary elbows. 3. Long service. As long as the galvanized elbow is used within the specified temperature and pressure range, its service time can reach to 50 years. 4. Anti-ultraviolet, anti-radiation.  Galvanized elbow will not fade. 5. Acid resistance, corrosion resistance and alkali resistance. Also there will be no bacteria breeding, no rust, and no electrochemical corrosion. 6. Heat resistance. If the working water temperature is 70 degrees, then the softening temperature is 140 degrees.

Hot-dip galvanized precision  seamless steel pipes  are gray or dark gray. Sometimes the surface pure zinc layer of pipe turn into gray after galvanizing due to iron content, causing color difference. Why does this happen?   Specific reason: 1. The material of the plated parts contains lots elements such as carbon, silicon, sulfur, and phosphorus. The electrochemical reaction between iron and zinc is due to the inert electrode formed by this type of element, and the relative potential becomes higher, which causes the iron and zinc reaction to intensify.   2. The content of aluminum and other metal elements in the zinc liquid is low, and for active steel and other materials galvanizing, the iron-zinc reaction cannot be effectively suppressed.   3. The increaseed iron content in the zinc liquid deteriorates the quality of the zinc liquid.   Improvement measures: 1. According to the material, choose the appropriate galvanizing temperature; 2. Adjust the composition of zinc liquid to contr