Square tubes shall be stored with supports， products and tens of millions of products for you to choose. You can professionally sell square tubes， square rectangular tubes， galvanized square tubes and galvanized tubes. The transaction safety of galvanized tubes is guaranteed， and they are at a certain distance from the ground to ensure the ventilation of square tubes.
7The flattening speed of the sample can be ~ mmin.
pDerusting grade for the construction process of epoxy， ethylene phenolic and other coatings commonly used for square pipes，Q355b square tube the surface of square pipes is generally required to reach near white grade (SA). Practice has proved that almost all oxide scale，Galvanized square pipe price todayStrive for high-quality development of the industry rust and other dirt can be removed by using this derusting grade， and the depth of anchor grain can reach ~ & mu; m， which fully meets the requirements of adhesion between layer and square pipe The shot derusting process can meet the technical conditions of near white level (SA) with low operation cost and stable and reliable quality.
Square tube flattening test is a kind of test to check the deformation performance of metal tubes (seamless square tubes and rectangular tubes) flattened to the specified size and show their defects. Relevant flattening tests shall be carried out in accordance with relevant provisions of test standards. Requirements for samples samples can be taken from metal pipes with qualified appearance. Generally， sawing is adopted. The inner and outer walls of the pipe shall retain the original surface without any processing. Sample length L & asymp; D (D is the outer diameter of the pipe). When the outer diameter is large， the length l shall not exceed mm. When the outer diameter is less than mm， l = mm. When cutting the sample， the surface of the sample shall not be damaged and the performance of the metal shall not be changed due to heating or cold processing. The edge of the section shall be flattened. The flattening test is a test to check the deformation performance of the metal pipe (seamless square pipe and rectangular pipe) flattened to the specified size and show its defects. Relevant flattening tests shall be carried out in accordance with relevant provisions of test standards.
NLiegeBe sure to select special for square pipe cutting.
XwIt 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: - yield strength: & Ge; elongation: & Ge; mechanical properties of seamless pipe: tensile strength: - yield strength: ≥ elongation: & Ge; mechanical properties of seamless pipe: tensile strength: - yield strength: ≥ elongation: & Ge; mechanical properties of seamless pipe: tensile strength: - yield strength: ≥ elongation: & Ge; mechanical properties of seamless pipe: tensile strength: - yield strength: ≥ elongation: & Ge; square tube belongs to low alloy series. It is one of the materials of seamless steel pipe. In low alloy materials，Q355b square tube quenching， surface quenching or chemical heat treatment shall be carried out， followed by low-temperature tempering treatment.
a: it refers to the processing of square tube， which places metal in a closed Jane and applies pressure at the end to extrude the metal from the specified die hole to obtain finished products with the same shape and size. It is mostly used to produce non-ferrous metal materials. Square tube ferrous metal， steel and non-ferrous metal. Before introducing the classification of steel， briefly introduce the basic concepts of ferrous metal， square tube steel and non-ferrous metal.
CIt is forbidden to degrease the oil square pipes and pipe fittings in the direct production concentration unit， air separation unit， oil refining and chemical engineering according to the design requirements. The purpose of degreasing is to prevent the transported or stored materials from being contaminated by grease or organic matter; Avoid mixing transported or stored materials with grease or organic matter; Oil content to ensure the activity of the catalyst; The content of oil and organic matter to ensure the purity of the product. The installed square pipe shall be disassembled into pipe sections for degreasing. Pipes that cannot be disassembled after installation shall be degreased before installation. Square pipes with obvious oil stains or serious corrosion shall be cleaned by steam purging， sand blasting or other methods before degreasing.
QTotal quality managementAccording to production，Q355b square tube square tubes are divided into hot-rolled tubes， cold-rolled tubes，Galvanized square pipe price todayStrive for high-quality development of the industry cold drawn tubes， tubes， pipe jacking， etc. According to the section shape， the square tube is divided into round and special-shaped. The special-shaped tube has many complex shapes， such as square， oval， angular，Galvanized pipe_ Galvanized square pipe_ Seamless steel pipe_ Square tube - Wuxi Jiahang angular melon seed， remove the deposits on the surface of the square pipe surface with copper wire brush. Use the perfume oil or other scrubbing oil on the surface layer， or use phosphate or chromate solution， brush spray or dip coating. After the fixed reaction time， rinse the acid solution with plenty of fresh water on the surface.
， the blank holder area is insufficient， which easily leads to instability wrinkle; If the fillet is too small， the resistance of the material into the die will increase in the deformation process， and the material is not easy to move and transfer inward， thus increasing the large tensile stress in the force transfer area， which may lead to tensile cracking.
The strip caused by component segregation， that is， when the steel contains harmful impurities such as phosphorus and is pressed and delayed， the impurities elongate along the rolling direction. When the steel is cooled below ， these impurities become the core of ferrite， making the morphology of ferrite distributed in bands， and then pearlite distributed in bands. This band can be eliminated by electroslag remelting and increasing crystallization speed.
Scheme customizationsStrictly feed Si Ca wire quantity to ensure effective & Omega in steel; When (CA) is about .%， the inclusions can be fully denatured without generating more high melting point inclusions.
EMain uses of square tube: square tube is mainly used in tap water engineering， petrochemical industry， chemical industry， electric power industry agricultural irrigation and urban construction. It is one of the key products developed.
Square tube failure. When the pipeline is erected， it will naturally cause failure.
zThe welding process of square tube is analyzed. The square tube is produced and processed at room temperature with strip steel as raw material. Square pipe can be divided into straight seam welded pipe it is necessary to do a good job or directly use the square pipe. The reason for the corrosion of the pipeline is that the layer of the pipeline is damaged. Once the layer is separated from the pipe surface， square pipe and spiral welded pipe. Due to the different uses of welded pipes， the standards of welded pipes are summarized in turn: galvanized qb square pipe for low-pressure fluid transportation， and the standard number is gbt-. Representative materials: QA， qbqb， etc. It is mainly used for conveying water， air， oil and heating hot water or steam， and is used for general low pressure fluid.
iD， the blank holder area is insufficient， which easily leads to instability wrinkle; If the fillet is too small， the resistance of the material into the die will increase in the deformation process， and the material is not easy to move and transfer inward， thus increasing the large tensile stress in the force transfer area， which may lead to tensile cracking.
The raw material for rolling square tube is round tube blank. For a long time， square tube， rectangular tube， seamless square tube， galvanized square tube and galvanized tube have complete products， excellent quality and favorable price. The round tube embryo shall be cut and processed by cutting machine， and the blank with a growth of about m shall be brought to the furnace for heating. The billet is sent to the furnace for heating at a temperature of about degrees Celsius. The fuel is hydrogen or acetylene. The temperature in the furnace is the key problem. After the round tube billet is discharged from the furnace， it should be pierced through the pressure piercer. Generally， the more common piercer is the conical roll piercer. This piercer has high production efficiency， good product quality， large perforation expansion and can wear a variety of steel grades.