Process flow of square tube drawing: because the size of the die hole of the square tube drawing is smaller than the outer diameter of the tube in front of the drawing in order to make the front end of the square tube pass through the die hole smoothly， so that the clamp jaw of the drawing trolley can the head of the square tube， the end of the square tube with a fixed length should be heated in the slit heating furnace， It is generally ~ mm， and the heating temperature is between ~ ℃ according to different wall thickness. Then use ~ kg air hammer to sharpen and grind the head of the square pipe. Generally， the square pipe with diameter less than mm can be sharpened by rotary forging hammer or roll forging machine.
4During the storage of square tubes，Large diameter square tube pay attention to the stacking layers of square tubes to avoid local stress at the tube end caused by too many layers，15 galvanized square pipePrecautions for operation resulting in radial plastic deformation and layer damage of square tubes. It is recommended that the stacking layers of smooth pipes refer to apirp l- Recommended Practice for railway transportation of square pipes for pipelines or apirp lw- Recommended Practice for ship and sea vessel transportation of square pipes for pipelines. It can also be determined by test or implemented according to the safe stacking height of square pipes. The stacking layers of pipes shall be implemented according to GBT - polyethylene layer of buried steel pipelines.
ySuperior square tubular steel (both P and s ≤ .%)
After the square pipe is produced， that is， the scale， rust， dirt and attachments on the surface of the square pipe are removed. Those that cannot be treated by physical treatment should be treated by chemical treatment.
NMako before slicing. Highlight: push your hand straight up and down without bending and tremor. Dont know when its down. Take a constant speed and hand power to stabilize it. Dont slice or cut it completely.
WnThe square tube is cut into single pieces by air plasma cutting machine.
Mechanical polishing: after processing， the parts have good levelness， short gloss， dull and rusty. Suitable for processing simple parts， medium and small products.
After the sample is flattened to the specified flattening distance h，Large diameter square tube remove the load and remove the sample.
xSpecial performance steel: A. stainless and acid resistant steel; b. Heat resistant steel: including oxidation resistant steel， heat strength steel and air valve steel; c. Electric heating alloy steel; d. Wear resistant steel; e. Low temperature steel; f. Electrical steel.
FNow， with the continuous development of qb square tube， its use is becoming more and more extensive， and the technology is also following up. Therefore， we still look forward to the development of qb square tube in the future.
LEconomic managementThe square tube represents the large capacity of the metal material under the action of tension， and the calculation formula is: where: FB -- the strong force borne by the sample when it is broken， n (Newton); So -- original cross-sectional area of sample， mm. Yield point (& sigma; s) the stress of metal material with yield phenomenon when the specimen can continue to elongate without increasing (keeping constant) the force during the tensile process， which is called the yield point.
dBLow alloy steel is divided into q Mn，Large diameter square tube Q， St-，15 galvanized square pipePrecautions for operation etc.
Square pipe， the steel pipe whose ratio of outer diameter to wall thickness is less than is called square pipe. At present， the square tubes produced by qb square tube factory are mainly used in tap water engineering， petrochemical industry， chemical industry， electric power industry， agricultural irrigation and urban construction. For transportation: water supply and drainage. For gas transmission: gas， steam and liquefied petroleum gas. For structure: as pile driving pipe
Square pipe is the name of square pipe，Galvanized pipe_ Galvanized square pipe_ Seamless steel pipe_ Square tube - Wuxi Jiahang that is steel pipe with equal side length. It is made of rolled strip steel after process treatment. Generally， the strip steel is unpacked leveled， crimped and welded to form a round pipe， then rolled into a square pipe from the round pipe， and then cut into the required length. Usually pieces per bag.
Where can I find it?jStrength 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， 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.
DFor improper stamping direction， simulation software shall be used in the initial stage of design to ensure that the direction of stamping parts is analyzed， and when the high-quality requirements of components require the re development of molds， the direction shall be adjusted to seamless square tubes. The square tube manufacturer introduces the forming， bending and bending of square tubes. As the name suggests， the bending is compacted， and the inner and outer rollers are double with the inner and outer walls of tube billets during actual bending Compact towards the.
General square pipes are stacked outdoors， and most of them are buried underground when in use， so they are easy to corrode and rust. In order to ensure the smooth flow of the pipeline， square pipes must have strong corrosion resistance. Once the pipeline is corroded， it will cause oil and gas leakage， but also pollute the environment， and may even lead to fire and cause harm.
mIt 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.
zJIn short， the square tube production process includes these processes: tube blank & mdash& mdash; Cut off & mdash& mdash; Heating & mdash& mdash; Perforation & mdash& mdash; Pipe rolling & mdash& mdash; Sizing (reducing) & mdash& mdash; Straightening & mdash& mdash; Cut head and tail & mdash& mdash; Inspection & mdash& mdash; Packaging & mdash& mdash; Warehousing.
Dimensional stability for high-precision square tubes， the required accuracy is high， so the dimensional stability must be maintained. Due to straightening in the air and slow cooling speed， so it must be cooled; Reduce quenching deformation because the square tube is slender， it is easy to deform during quenching， so its deformation must be strictly controlled. Heat treatment is a key process. In the process of quenching and cooling， the cold plasticity shall be corrected in time， which is a key step to ensure the improvement of its qualification rate. Therefore， hot bath quenching or cooling in oil for a fixed time shall be carried out to propose thermal correction.