Luoyang large caliber square tube wholesale and direct production
Square alloy tube with ferrite structure in service. Chromium content is 11%~30%, with body centered cubic crystal structure. This kind of steel generally does not contain nickel, and sometimes contains a small amount of elements such as Mo, Ti, Nb, etc. This kind of steel has the characteristics of high thermal conductivity, small shrinkage coefficient, good oxidation resistance, stress corrosion resistance, etc. It is mostly used to manufacture parts and components resistant to atmospheric, steam, water and oxidizing acid corrosion. The application of this kind of alloy square tube is limited because of its poor plasticity, significantly reduced plasticity and corrosion resistance after welding. The application of secondary refining technology (AOD or VOD) can greatly reduce the interstitial elements such as carbon and nitrogen, thus making this kind of steel widely used.
Luoyang large caliber square tube wholesale and direct production
1. The allowable tendency of the wall thickness of square and rectangular pipes shall not exceed plus or minus 10% of the nominal wall thickness when the wall thickness is not more than 10 mm, and plus or minus 8% of the wall thickness when the wall thickness is more than 10 mm, except for the wall thickness of corners and weld areas. 2. Generally, the delivery length of rectangular tube is 4000mm-12000mm, most of which are 6000mm and 12000mm. Square and rectangular pipes are allowed to consign short and non fixed length products not less than 2000mm, and can also be delivered in the form of interface pipes, but the demander shall cut off the interface pipes when using them. The weight of short and non fixed length products shall not exceed 5% of the total delivery quantity. For square and rectangular pipes with theoretical weight greater than 20kg/m, the weight shall not exceed 10% of the total delivery quantity. The bending of square and rectangular pipes shall not exceed 2mm per meter, and the total bending shall not exceed 0.2% of the total length.
Luoyang large caliber square tube wholesale and direct production
1. Pay attention when customers choose square tubes! Choose the right square tube for your request. 2. Some anti-corrosion measures shall be taken for pipes during operation. 3. Do not overload when using. For example, only by weighing can you be overweight. 4. Do not weld or pull bridge wires on the pipe at will, which may cause damage and defects to the pipe. 5. It is important to pay attention to whether the pipes are intact and whether the quality meets the national standards when choosing to purchase. Can we disagree with your request.
Luoyang large caliber square tube wholesale and direct production
1. The straight square passes can be divided into two categories: one is the special pass, that is, fixed body making. The forming methods of this method include: fixed point reducing method, variable point sizing method, fixed diameter bending point outward moving method, fixed diameter bending point inward and outward moving method. The second type is the general pass, which is currently used by most domestic consumer enterprises. General pass is the third and fourth combination of special pass forming methods. In this pass, the upper roll at the bend has a fixed fillet, and different strip thicknesses are treated with the same upper roll. In practice, a vague technology is used to solve the problem. This technology saves a lot of rolls, so most consumer manufacturers want to use this pass. 2. There are roughly two forming methods of round to square: first, box pass deformation. Box pass deformation is that the main pipe stops deformation on the main pipe after the alternate action of four ordinary flat rolls and three vertical rolls or more passes of flat rolls and vertical rolls. It can be simply described as: flat roll up and down extrusion is referred to as "flattening"; vertical roll left and right extrusion is referred to as "extruding". The main pipe gradually approaches the profile shape in several processes of "flattening" and "extruding", and then becomes the required profile. Second, four roll deformation. Four roll deformation means that four rolls form a pass in the same plane, and the main pipe passes through the pass, similar to drawing deformation, but it changes the drawing fixed die into a separate rolling die.
Luoyang large caliber square tube wholesale and direct production
Application: It is widely used in machinery manufacturing, construction, metallurgy, agricultural vehicles, agricultural greenhouses, automobile industry, railways, highway guardrails, container frameworks, furniture, decoration and steel construction. It is used in engineering buildings, glass curtain walls, door and window decoration, steel construction, guardrail, machinery manufacturing, automobile manufacturing, home appliance manufacturing, shipbuilding, container manufacturing, electricity, agricultural construction, agricultural greenhouses, bicycle racks, motorcycle racks, shelves, fitness equipment, leisure and tourism products, steel furniture, various specifications of oil casing, oil pipes and pipeline pipes, water, gas, sewage Air, heating and other fluid escorts, fire protection and support, construction industry, etc.
