Nnewi19 galvanized pipeHow does it work?

The surface hardening treatment of qq355b square tube is generally isothermal quenching, that is, heat treatment technology. After isothermal quenching, qq355b square tube will obtain more and better properties, and make qq355b square tube be applied in more fields.

Low alloy steel is divided into q34 16Mn,Nnewi50 price of galvanized square pipe, Q390, St52-3, etc.

Nnewi.B. tool steel: (a) carbon tool steel; (b) Alloy tool steel; (c) High speed tool steel.

It is feasible to use the theory to calculate static structures, such as warehouses, houses and bridges, but it is not suitable for moving components such as wheels. At this time people often use the plastic theory. The research of the plastic theory can be traced back to 1914. In 1975, the European Design Association formulated a plastic design code, which is mainly used for static load plane beams and frame structures subjected to bending stress The solution is as follows: for high-rise buildings, more detailed calculations are needed.

.The q355b square tube rolled from the strip steel through process treatment is generally to unpack, flatten, curl and weld the strip steel to form a round tube, then roll the round tube into a square tube, and then cut it to the required length. Nowadays, the forming of q355b square tube has solid bending and empty bending. The bending degree of q355b square tube shall not be greater than 3mm per meter, and the total bending degree shall not be greater than the actual bending of the total length. As the name suggests, the bending is compacted,NnewiHow much is galvanized pipe, so that the production quality of square tube can be more strictly guaranteed. This paper mainly introduces the drawing process flow of square tube. Let's understand it below.

The square tube will be tested in many aspects of its performance in the process. Each test is for the square tube to have a good performance in practical application. So what are the different properties of square tubes? Next it needs a lot of processes to complete the production process, I'll introduce the characteristics of the lower tubes in terms of mechanical properties.

Because the green billet can be pressed into any shape,Nnewi80 plating, it is easy to weld the square tube into difficult products.

Square pipe, the steel pipe whose ratio of outer diameter to wall thickness is less than 20 is called square pipe. At present, the square tubes produced by q355b square tube factory are mainly used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction. For transportation: water supply and drainage. For gas transmission: gas, steam and liquefied petroleum gas. do

Statistics.The purpose of heat is to prevent the generation of cold cracks. Cold crack is directly related to carbon equivalent. Therefore, it is necessary to distinguish the carbon equivalent of the q355b square tube, and the carbon equivalent of the q355b square tube is the same. If the carbon equivalent of Q345 is less than 0.3%, it can be said that the weldability is OK. Generally speaking, the cold crack increases when the carbon equivalent is 0.4%.

Should choose in the end is galvanized or paint; For paint, it is recommended to match: epoxy zinc rich 50um + epoxy micaceous iron intermediate paint 80um + polyurethane finish paint 60um. In this way, according to the standard of iso12944, you can protect the indoor and outdoor environment for 10 years, which is not a big problem.

Performance index analysis fatigue of square tube the strength, plasticity and hardness discussed above are the indicators of the mechanical properties of metal under static load. In fact, many machine parts work under cyclic load, under which fatigue will occur.

Performance index analysis of square tube - hardness is an indicator to measure the hardness and softness of metal materials. At present, the hardness method is commonly used to measure the hardness in production. It uses the indenter with fixed geometry to measure the hardness value of the metal material surface tested under fixed load according to the degree of hardness.

Potential development.Now, Fangguan can achieve such good results in the market, 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.

Compared with other welding, square pipe welding has many advantages, mainly because of the exothermic reaction, there is a large rate of end in the application of steel pipe, which is mainly due to the trouble of internal and external treatment. The first question is very crucial, the corner size and edge flatness of the square pipe are uniform

The surface compressive stress characteristics of the square tube will be obtained after isothermal quenching.

In the test, place the sample between two parallel plates and press it evenly to the flattening distance h specified in relevant technical conditions with a press or testing machine at a speed of no more than 60mmin.