Classification of wall thickness square tubes are divided into super square tubes， JG -， ASTM A， JIS gen or technical agreement.
1When cutting， please fix it with square tubes such as vise， and then cut it after it is fixed.
bStage ( & mdash; )
The performance advantage of square tube after calcium treatment requires not only high strength，Seamless square tube but also good machining performance. For sulfur-containing square tube，350 galvanized pipeProduct quality plan requirements sulfur can improve the machinability of steel， square rectangular tube， seamless square tube， galvanized square tube， galvanized tube， strict testing and quality assurance. In the process of preferential activities， welcome to consult. It is widely used as a pipeline for conveying fluid. It is mainly used in conveying， hydraulic support and mechanical structure， Medium and low pressure，Seamless square tube high pressure boiler tubes heat exchange tubes， gas， oil and other industries. It is stronger than welded and will not crack.
OuThe square tube is formed by external control or internal control roller.
Spray fluorocarbon paint after.
The inclusions in the square tube treated with calcium can be denatured well， and the morphology of sulfide in the rolled stock is also improved.
rThe difference between square pipe and seamless steel pipe the main feature of seamless steel pipe is no welding joint and can withstand large pressure. The product can be very rough as cast or cold drawn parts.
HAt present， square tubes also have many good properties， strong corrosion resistance and heat resistance， and are widely used in many scientific and technological fields. Therefore， 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.
NdemandApplication: it is widely used in machinery， construction， metallurgy，Seamless square tube agricultural vehicles， agricultural greenhouses automobiles，350 galvanized pipeProduct quality plan requirements railways， highway guardrails， container frames， square tubes， raw materials， i.e. strip coils， welding wires and fluxes. It must undergo strict physical and chemical inspection before being put into operation.
uRThe 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，Galvanized pipe_ Galvanized square pipe_ Seamless steel pipe_ Square tube - Wuxi Jiahang 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.
Preheating must be carried out before heat treatment of qb square tube， so as to better ensure that there will be no many problems in the whole heat treatment process of qb square tube， and the quality of qb square tube will also be well guaranteed.
Therefore， the drawing process of square tube is quite meticulous. For a long time， square tube， rectangular tube， seamless square tube， galvanized square tube， galvanized tube and other brand products are provided. The products of designated dealers are complete and the quality is guaranteed. In the process of continuous development， square tube has also been processed more rigorously.
analysisuFunctional index analysis of square tube - angular plasticity refers to the power of plastic deformation (permanent deformation) without destruction of square tube data under load.
GThe disadvantage of solid bending is that it has tensile thinning effect. The actual bending will produce tension at the bending point， and the tensile effect will shorten the longitudinal length of the bending line; The metal at the real bend will become thinner due to stretching.
Chemical polishing: less investment in processing equipment， high speed， high efficiency and good durability. Its defects are poor brightness， gas overflow， demand for ventilation equipment and difficult heating. It is suitable for processing small batch of disordered parts and products with low brightness demand for small parts.
hD. do not cut your hands boring， especially for girls. Holding or fingers will bind themselves.
gEIt is mainly caused by the fact that the square pipe body has no cover the covering protection is not ideal， and there is no support， partly due to the excessive number of stacking layers and most coastal areas belong to marine climate， with large annual rainfall， high air humidity， ponding in the square pipe and the square pipe. The protection shall be: if the bare pipe or pipe needs to be stored for a long time， it shall be protected with an uncovered object from the beginning of storage to avoid rusting， layer aging