Strength refers to the function that the square tube data is destroyed under static load (appropriate amount of plastic deformation or fracture)， compression， because the strength is also divided into tensile strength， compressive strength， flexural strength， shear strength and so on. There is often a definite connection between various strengths. In normal use，Products Show tensile strength is often used as the fundamental strength gauge.
6The researchers test before using the strip thinning drawing also confirmed that using the strip thinning drawing can greatly reduce the large value of tangential residual stress of the drawn parts and effectively prevent the occurrence of longitudinal cracking. According to different deformation degree and original sheet thickness，Galvanized special-shaped square pipeThe professional market is picking up and the price is going to fly the appropriate thinning coefficient & psi is selected; N (generally .t ~ .t)， if & psi; If n is too small， the deformation stress will increase sharply， resulting in the fracture of the bottom of the drawing part.
lThere are many ways of ignition， such as arc， electric spark， flame， strong current high-temperature furnace， electron beam，Products Show laser， high-temperature radiation， microwave， chemical furnace， etc.
Mechanical polishing: after processing， short gloss， dull and rusty. Suitable for processing simple parts， medium and small products.
YFaris KurAt present， square tubes also have many good properties， strong corrosion resistance and heat resistance，Products Show and are widely used in many scientific and technological fields. Therefore， even so，Galvanized special-shaped square pipeThe professional market is picking up and the price is going to fly wise people still do not stop studying the surface adhesion resistance of square tubes. Square tubes in the future will have better performance and make more important contributions to development.
StForging has many advantages in improving the plasticity of qb square tube and improving the quality of steel， because the cast state of forged metal can be broken when forging qb square tube. Therefore， there are forging workshops in some qb square tube factories.
The purity of the square tube has a great impact on the isotropic performance of the square tube. The use of secondary refining technology (including vacuum refining， ESR and ladle powder spraying) can improve the purity of the square tube， especially reduce the content of harmful impurities in the square tube which is beneficial to improving the performance.
High hardness square tubes mainly bear fatigue load， so they must have high hardness. Therefore， quenching， surface quenching or chemical heat treatment shall be carried out，Galvanized pipe_ Galvanized square pipe_ Seamless steel pipe_ Square tube - Wuxi Jiahang followed by low-temperature tempering treatment.
oGreatly reduce the structural weight and save steel. Square tube is an indispensable part of construction work， which we all know very well. Therefore， the quality of square tube will directly affect the development of construction industry. What if we can make the service life of square tube longer? Here， we also need to ask the personnel of the square tube manufacturer for instructions， and use ingenious methods to prolong the service life of the square tube， so that the square tube can bring us greater help in life.
ZThe quality of the solid square tube after the square tube formwork removal and curing can be tested according to the requirements and the following ways: use a magnifying glass to observe whether there are non external force cracks on the structural surface of the solid seamless qb square tube. When non external force cracks appear on the surface of qb square pipe， the crack width on the structural surface of ordinary qb square pipe shall not be greater than .mm.
YtargetIn the trend of the times we will change with the changes of the times， we will the use of the square tube so that the square tube can be used more widely. In our daily life， so that we can use the square tube more in future production. Next， lets introduce the difference between carbon steel and square tube.
cSIt 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.
Both internal and external welding of square pipes are carried out by American Lincoln Electric welding machine for single wire or double wire submerged arc welding， so as to obtain stable welding specifications.
Square pipe is an important type of square pipe， which has great similarities with seamless steel pipe， but it is different. Square pipe is of great use in square pipe， which is generally used in the field of building materials and pipes. Today we tell you about the painting of square pipe. In fact， most manufacturers need to do this function， not only painting but also galvanizing. Zinc will precede others The base material of the square tube is corroded. If painting is not for you， it will cost you two sums of money. If painting， it is recommended that you brush zinc rich primer， because you brush other paints， it will corrode quickly， and then continue to corrode your galvanized layer， you should paint before galvanizing
Good qualityhSquare tube with complex section: flower shaped square tube， open square tube， corrugated square tube and special-shaped square tube.
TReinforcing phases such as reinforcing particles， short fibers and whiskers can be added to the solder to form composites.
The test can be carried out under cold and hot conditions. If the test temperature is not specified， the test shall be carried out under normal temperature， but not lower than - ℃.
jPerformance 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.
fSThe strength of square tube refers to the function that the data of square tube are destroyed under static load (appropriate plastic deformation or fracture). Because the action forms of load include tension， contraction， meandering， shear and so on， because the strength is also divided into tensile strength， compressive strength， flexural strength， shear strength and so on. There is often a definite connection between various strengths. In normal use， tensile strength is often used as the fundamental strength gauge.
Stainless steel qb square pipe for mechanical structure， Standard No.: gbt-. Representative materials Cr cr crni CrNi crninb， automobile， bicycle， furniture， hotel and restaurant decoration.