The advantage of empty bending is that it can bend the side length when the real bending cannot be carried out， such as synchronous bending and finishing of the upper side and side of qb square tube. Empty bending can also bend the inner corner of r.t without fracture of pipe wall. The disadvantage of empty bending is that when the upper side and side are synchronous empty bending， the forming force is easy to exceed the critical point， resulting in edge instability and concave， and will also affect the stable operation of the unit and forming quality. This is also the different characteristics of qb square tube and round tube empty bending.
9To change the required line shape of qb square tube， it is necessary to forge the impact force of qb square tube hammer or the pressure of hydraulic press，Q345B square tube and can also enhance the malleability of qb square tube，Galvanized pipe manufacturerWhat causes the blockage that is， the performance of changing the shape without cracks.
aIf there is only single face weld， it shall be opened from the middle
How about the tensile strength of square pipe: square pipe has good tensile strength， tensile strength and sufficient toughness， which makes square pipe stand out in the field of steel pipe. The square tube has great advantages in high temperature， high pressure and even high strength environment. What are its characteristics? We analyze it one by one: tensile strength (& sigma; b) the strong force (FB) borne by the sample during tensile breaking， and the stress (& sigma;) obtained from the original cross-sectional area (so) of the sample is called tensile strength (& sigma; b)， and the unit is nmm (MPA).
XChai eryong， come upSquare pipe is an important type of square pipe，Q345B square tube which has great similarities with seamless steel pipe， but it is different. Square pipe is of great use in square pipe， 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， so as to achieve the finish coat on the zinc rich primer. In fact， you should paint before galvanizing
ApThe qb square tube protective layer thickness detector is used to measure the actual thickness of the seamless qb square tube protective layer on site. It is required that the actual thickness of the seamless qb square tube protective layer of the seamless qb square tube shall not be lower than the design value. When the requirements are not met，Q345B square tube the protective layer of seamless qb square tube can be chiseled and measured.
Now， its use is becoming more and more extensive，Galvanized pipe manufacturerWhat causes the blockage and the technology is also following up. Therefore， we still look forward to the development of qb square tube in the future.
When cutting， please fix it with square tubes such as vise， and then cut it after it is fixed.
xThe disadvantage of empty bending is that when the upper side and side are synchronously empty bending， the forming force is easy to exceed the critical point due to the pressure generated by the upper roll and the lower roll at the same time resulting in edge instability and concave， and will also affect the stable operation and forming quality of the unit. This is also the different characteristics of qb square tube and round tube empty bending. The concept of square tube: square tube is the pressure processing of ingot， billet or square tube Make materials of all shapes， sizes and properties we need.
KBefore square tube forming，Galvanized pipe_ Galvanized square pipe_ Seamless steel pipe_ Square tube - Wuxi Jiahang the strip steel shall be leveled， trimmed， planed， surface cleaned， transported and pre bent.
PQuality inspection reportIt seems that preheating the qb square tube can avoid a lot of problems， and there will be a better guarantee that the qb square tube itself is a quality problem.
hOSquare tubes can be degreased with organic solvents (vinyl chloride， vinyl chloride， carbon chloride， industrial solvents， benzene， acetone， etc.)， which is suitable for manual scrubbing of the inner surface of the container with low degreasing requirements; % concentrated suitable for degreasing some pipe fittings and porcelain rings of concentrated device.
Square pipes are mainly used in engineering buildings， glass curtain walls， door and window decoration， steel structures， guardrails， automobiles， household appliances， shipbuilding containers， electric power， agricultural construction agricultural greenhouses， bicycle frames， motorcycle frames， shelves， fitness equipment， leisure and tourism， steel furniture， various specifications of oil casing， oil pipes and pipeline pipes， water， gas， sewage， air Heating and other fluid transportation， fire fighting and support construction and other fields.
Due to the interaction between chromium and carbon in martensitic chromium nickel square tube， stable R phase region and stable a + R phase region are formed at high temperature. The increase of carbon content can expand the R-phase region， but the dissolution limit of carbon decreases with the increase of chromium content. The addition of nickel to martensitic chromium nickel square tube solves the problem that the hardness of steel is sacrificed to improve the corrosion resistance of martensitic square tube. However， the nickel content is not easy to be too high， otherwise the square tube will become austenite square tube due to nickel expanding austenite phase zone and reducing MS temperature， so as to completely lose the quenching ability.
How much does it cost?lStrength refers to the function that the square tube data is destroyed under static load (appropriate amount of plastic deformation or fracture)， because the action form of load includes tension， compression， meandering shear and so on， because the strength is also divided into tensile 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.
VIn this period， the technology of continuous rolling pipe was not mature.
The improvement ensures that the square tube can be used for a long time. With the development of the times， square tubes are used in more and more fields. So how can we correctly select the square tube? Let me introduce the process of the lower tube.
hTo change the required line shape of qb square tube， it is necessary to forge the impact force of qb square tube hammer or the pressure of hydraulic press， and can also enhance the malleability of qb square tube， that is， the performance of changing the shape without cracks.
yZSolid 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.
On the basis of thermodynamic calculation， the quality assurance of square tube， rectangular tube， seamless square tube， galvanized square tube and galvanized tube is professional. New and old customers are welcome to consult during the preferential activities. The process conditions of calcium treatment of CrMo sulfur-containing square tube are analyzed， and the sulfur-containing gear rolled products after calcium treatment are sampled and studied. The conclusions are as follows: in order to minimize the generation of Cao in sulfur-containing square tube steel， Omega in molten steel; (O) It must be taken off to & times; The rate of calcium can only be guaranteed below -.