With the improvement of production quality， their characteristics and uses are different. I will introduce the characteristics and uses of square tubes in detail.
According to smelting classification and furnace type， A. open hearth steel: (a) acid open hearth steel; (b) Alkaline open hearth steel.
DandmondSquare tube is the main type of square tube. It is also very popular in the square tube market. There are many people doing this kind of thing so there are many in the competition. The future market potential is huge. We should grasp this information well. In addition， we must learn about relevant maintenance and repair!
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， so as to improve yield strength and save steel.
HuaibeiImpact toughness the load acting on the machine part at a great speed by QB is called impact load， square rectangular tubes， galvanized square tubes and galvanized tubes are welcome to waste merchants， industries， enterprises and power departments to visit and negotiate! Oxidation will also occur on the surface of square tubes after long-term use. What should we do if oxidation occurs? Let me give you a detailed introduction on how to remove square tubes Oxide scale.
Square tube for automobile half shaft sleeve (gb-) is a high-quality carbon structural steel and alloy structural steel hot-rolled square tube for automobile half shaft sleeve and drive axle housing.
So flat， and the size and thickness are not standardized，DandmondStainless steel 25 square tube， it can reflect that this square tube is a poor product& rdquo;
Of course， since the qb square tube material is selected as the base metal， it generally has special purposes， so the welding materials will not be selected casually. It is better to use it according to the welding material manual. If the welding rod manual says that the base metal should be preheated， it should be preheated. Because the welding materials are not used according to the manufacturer"s instructions， the weld performance will be greatly reduced.
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.
reformSuperior square tubular steel (both P and s ≤ .%)
When storing QB square pipe， we need to select a suitable place. We need to think about many external factors， such as the corrosivity of steel pipe， etc. Therefore， the place must be clean， dry and ventilated， where harmful gases appear， QB square pipe can not appear， weeds and other sundries should be removed in time， and the outer surface of steel should be kept clean. If there are acid， alkali， etc. in the warehouse， it is easy to react with the steel pipe and corrode the steel pipe， so try to cut it and don"t let it. In addition， if we can think about those higher metal products， we can put them into the warehouse for very good retention. According to geographical conditions there is a sealed warehouse， but the ventilation setting is excellent. The difference between QB square tube and seamless steel tube QB square tube is a kind of high-precision steel tube material after cold drawing or hot rolling treatment. QB square tube is mainly used to produce products of pneumatic or hydraulic components， such as air cylinder or oil cylinder， which can be seamless pipe or welded pipe， because there is no oxide layer on the inner and outer walls of QB square tube， high precision， high finish， cold bending， flaring and flattening without cracks. The chemical composition of QB square tube includes carbon silicon Si， manganese Mn， sulfur s， phosphorus P and chromium CR.
High density may not be obtained by simple pressurization and insulation shall be carried out at the same time.
Square tube plays an important role in the rapid economic development. The functions of square tube are different，DandmondGalvanized layer thickness of square pipe， and its characteristics are also different. Square tube has strict standards. There are many welding processes and advantages of square tube. Let me show you the welding process and advantages of lower tube.
Latest quotationIt is good to purchase Baosteel"s materials for cold drawing of square tubes， because Baosteel"s materials are subject to grade flaw detection， and the density of steel is relatively good. After cold drawing and heating， it is convenient to line up. The steel is cold drawn at room temperature to produce plastic deformation， so as to improve the yield strength. This process is called cold drawing strengthening. Square tube is generally used for product parts with high requirements. It has good willfulness and strength. The surface is better after cold drawing. Cold drawing principle.
In the trend of the times we will change with the changes of the times， so that the square tube can be used more widely. In our daily life， we will the use of the square tube， so that we can use the square tube more in future production. Next， let"s introduce the difference between carbon steel and square tube.
Principle of cold drawing strengthening: the lattice defects of steel increase during plastic deformation， and the serious distortion of defect lattice will hinder the progress and slip of lattice， so the yield point of steel increases and the plasticity and toughness decrease. Due to the internal stress in plastic deformation， the modulus of steel decreases. The cold drawn reinforcement is stored at room temperature for ~ d or heated to ~ ℃ and maintained for a fixed time. This process is called aging treatment.
Dandmond special shaped square pipe is the general name of square pipes with other cross-section shapes except circular pipe. According to the different cross-section shape and size of steel pipe， it can be divided into special-shaped square pipe with equal wall thickness (code D)， special-shaped square pipe with unequal wall thickness (code BD) and special-shaped seamless steel pipe with variable diameter (code D) These special-shaped large-diameter qb square tubes are widely used in various structural parts， tools and mechanical parts. Compared with circular tubes， special-shaped tubes generally have large moment of inertia and section modulus and have large bending and torsion resistance， which can greatly reduce the structural weight and save steel. Square tubes are an indispensable part of construction work
The general delivery length of qb square pipe is mm-mm， mostly mm and mm. Qb square tube is allowed to deliver short length and non fixed length products not less than mm，DandmondGalvanized square tube rectangular， or in the form of interface tube
Engaged in square tube， square rectangular tube， seamless square tube， galvanized square tube， galvanized tube， old brand， price advantage and quality guarantee! However， the Demander shall cut off the interface pipe when using it. The weight of short length and non fixed length products shall not exceed % of the total delivery. For qb square pipe with theoretical weight greater than kgm， it shall not exceed % of the total delivery. The bending degree of qb square pipe shall not be greater than mm per meter， and the total bending degree shall not be greater than .% of the total length. Galvanized qb square pipe for low-pressure fluid transmission， with standard number of gbt-. Representative materials: QA， qbqb， etc. It is mainly used for conveying water， gas， air， oil and heating hot water or steam， and its purpose is limited to general low pressure fluid.
