San-RamonDN25 
San-RafaelHow 
HerediaDN25 gaIt must be noted that in the overall process of square tube coating process, the cost of surface treatment is still relatively high, so it is very important to select appropriate treatment. Only by selecting the right treatment can the coating quality of square pipe be well guaranteed.
Tensile strength: 490-675 yield strength: & Ge; 345 elongation: & Ge; 22 mechanical properties of seamless pipe: tensile strength: 490-675 yield strength: ≥ 345 elongation: & Ge; 21 mechanical properties of seamless pipe: tensile strength: 490-675 yield strength: ≥ 345 elongation: & Ge; 21 mechanical properties of seamless pipe: tensile strength: 490-675 yield strength: ≥ 345 elongation: & Ge; 22 mechanical properties of seamless pipe: tensile strength: 490-675 yield strength: ≥ 345 elongation: & Ge; 22 square tube belongs to low alloy series. It is one of the materials of seamless steel pipe. In low alloy materials, this material is ordinary. Square tube used to be called Q345B square tube.
Naranjo.The second is to clean the surface of the opposite pipe. When cleaning the opposite pipe, the surface should be cleaned with solvent or emulsion. Square pipes of various specifications, square rectangular pipes, seamless square pipes, galvanized square pipes, galvanized pipes are supplied in time and cost-effective. They have become the preferred brand of many wire products. Welcome to buy! It is used to remove oil and dust. It is only suitable for removing grease and dust on the surface of square pipe, which can not remove rust and oxide scale. Therefore, it can only be used as an auxiliary means in production.
After the sample is flattened to the specified flattening distance h, remove the load and remove the sample.
.When we understand the causes of defects in the drawing process of q355b square tube, we should constantly improve the technology in the subsequent production process, so that we can reduce the occurrence of defects.
After the square pipe is produced, the surface treatment is generally carried out,Naranjo22 price of galvanized square pipe, that is, the scale, rust, dirt and attachments on the surface of the square pipe are removed. Those that cannot be treated by physical treatment should be treated by chemical treatment.
Polishing process of square tube square tube is widely used in our life, so in the subsequent application process, the requirements for square tube in many places are also quite strict, especially for surface treatment. Today, we briefly introduce how the polishing process should be carried out.
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.
After cold drawing and aging treatment, the yield point is improved, the tensile ultimate strength is also increased and the plasticity continues to decrease. Due to the reduction of internal stress during aging, the modulus can be basically restored. According to this principle, cold drawing or cold drawing of reinforcement or low carbon steel wire rod is often carried out on site or prefabricated component factory, which is called square pipe.
Installation conditions.Material of square tube: q23 Q345 (16Mn), 20#, alloy steel, stainless steel.
Under the international investigation, there has been a new improvement, which ensures that the square tube can be used for a long time. With the development of the times,NaranjoGalvanized square pipe Q345B, I will introduce the process of square tubes for you.
The advantages of real bending are small reverse, accurate forming, and as long as the roll shape is accurate, the R of inner corner forming is more accurate. The disadvantage of solid bending is that it has tensile thinning effect. The actual bending will produce tension at the bending point, the covering protection is not ideal, and there is no support, partly due to the excessive number of stacking layers, and most coastal areas belong to marine climate with large annual rainfall, high air humidity, ponding in the square pipe and the square pipe. The protection shall be: if the bare pipe or pipe needs to be stored for a long time, it shall be protected with an uncovered object from the beginning of storage to avoid rusting, layer aging, edge warping and other phenomena of the square pipe.
Market trend.In short, the square tube production process includes these processes: tube blank & mdash& mdash; Cut off & mdash& mdash; Heating & mdash& mdash; Perforation & mdash& mdash; Pipe rolling & mdash& mdash; Sizing (reducing) & mdash& mdash; Straightening & mdash& mdash; Cut head and tail & mdash& mdash; Inspection & mdash& mdash; Packaging & mdash& mdash; Warehousing.
The difference between hot-dip galvanized square pipe and cold-dip galvanized square pipe is mainly from the following aspects: the appearance of hot-dip galvanized square pipe is slightly rough compared with cold-dip galvanized square pipe; The appearance of cold galvanized square pipe is smooth and bright.
Use classification square tubes are divided into: square tubes for decoration, square tubes for machine tool equipment, square tubes for mechanical industry,NaranjoGalvanized steel strip square pipe, square tubes for chemical industry, square tubes for steel structure, square tubes for shipbuilding, square tubes for automobile, square tubes for steel beams and columns, and square tubes for special purposes.
Naranjo.Chemical polishing: less investment in processing equipment, high speed, high efficiency and good durability. Its defects are poor brightness gas overflow, demand for ventilation equipment and difficult heating. It is suitable for processing small batch of disordered parts and products with low brightness demand for small parts.
Mechanical polishing: after processing, the parts have good levelness, short gloss, dull and rusty. Suitable for processing simple parts, medium and small products.
Square tube is made of steel ingot or solid tube blank through perforation, and then made by hot rolling