Use classification square tubes are divided into: square tubes for decoration， square tubes for machine tool equipment
Use classification square tubes are divided into: square tubes for decoration， square tubes for chemical industry， square tubes for steel structure， square tubes for shipbuilding， square tubes for automobile，Q355d square tube square tubes for steel beams and columns，16 galvanized square pipeUse and maintenance of and square tubes for special purposes.
5In the heat exchange planning of metallurgy， petrochemical and other occupations， there are various forms of heat exchangers， such as poor heat exchange， difficult cleaning， large dust thermal resistance and so on， which can not meet the needs of production customers. The square tube heat exchanger based on square tube throat has the advantages of excellent heat exchange， easy cleaning， small dust thermal resistance and compact structure.
lHot dip galvanized square pipe is widely used，Q355d square tube mainly in curtain wall， solar power generation support， construction， machinery and steel structure engineering， especially in curtain wall， Ill introduce the characteristics of the lower tubes in terms of mechanical properties.
WHoraburenThe 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，Q355d square tube it should be pierced through the pressure piercer. Generally， the more common piercer is the conical roll piercer. This piercer has high production efficiency，16 galvanized square pipeUse and maintenance of good product quality， large perforation expansion and can wear a variety of steel grades.
VaAccording to the welding specification， process test and process analysis， it is determined that the butt weld of QB square pipe adopts double-layer CO gas shielded welding. HMnSiA， mm welding wire for welding material; The shielding gas is pure CO gas. The welding current of layer weld is ~ A， and that of the second layer is ~ A; The arc voltage is ~ V. The process requirement is that the layer weld must be fully welded to ensure good back forming; The welding current， arc voltage， wire feeding speed and welding speed can be adjusted according to the equipment model.
Therefore，Square pipe, square rectangular pipe, seamless square pipe, galvanized square pipe, galvanized pipe - Wuxi Jiahang metal products Co., Ltd 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.
Square pipes are mainly used in engineering buildings， glass curtain walls door and window decoration， steel structures， guardrails， machinery， 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.
zThe principle is similar to that of the plate rolling machine. The bending machine can determine a circle. Adjust the height to adjust the curvature.
ZIn the processing process， the processing temperature is the key. We specialize in selling square tubes rectangular tubes， seamless square tubes， strict testing， more affordable price and more preferential. We welcome consultation. Also we must pay attention to the uniform heating of blanks. Perforation has a great impact on the quality. The perforation temperature of blank varies according to different materials， generally around ℃.
VresourcesProduction standard classification square tube is divided according to production standard: national standard square tube， Japanese standard square tube， British standard square tube， American standard square tube， European standard square tube and non-standard square tube.
nKFormulate the documents stored by the square tube for a long time and implement them in accordance with.
The surface hardening treatment of qqb square tube is generally isothermal quenching， that is， heat treatment technology. After isothermal quenching， qqb square tube will obtain more and better properties， and make qqb square tube be applied in more fields.
The 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.
property rightqFirst， 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.
IPut the pig iron for steelmaking into the steelmaking furnace according to the specified process to obtain steel. The products of steel include ingots， continuous casting billets and various steel castings made of straight square tubes. Generally speaking， steel refers to the steel rolled into various square tubes. Square tube steel belongs to ferrous metal， but steel is not completely equal to ferrous metal.
Steel with chromium content of more than % in steel and high corrosion of external medium (acid， alkali salt) is called square pipe. According to the condition in steel， square tubes can be divided into martensite， ferrite， austenite and ferrite & mdash; Austenite type， precipitation hardening square tube， according to the standard gb & mdash; regulations a total of regulations.
bMechanical properties of seamless qb square tube: tensile strength & sigma; b (MPa)：≥ yield strength & sigma; s (MPa)：≥ elongation & Delta; (%)：≥ reduction of area & psi; (%)：≥ impact absorption energy (impact value) (akuj): & Ge; the products produced by the more complex technology are exquisite. At present， Fangguan is highly praised by the public in the market. What is important is that there is a good guarantee in terms of quality. Therefore， whether Fangguan can obtain such a high market evaluation depends on the complex technology of Fangguan.
gCGeneral 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.
It is learned from that when degreasing the square pipe， if there is dirt on the outer surface of the steel pipe， then soaked with degreasing agent with a dry cloth to remove the oil， and then dried in the open air. When degreasing the inner surface of the opposite pipe， the end of the pipe can be tightly blocked with a wooden plug or closed with other. The degreasing solvent with the volume of % - % of the pipe from the other end shall be sealed with a wooden plug， placed in a flat and clean place or on a workbench with sleepers for -min， and the pipe shall be rotated every min. If degreasing is required for stainless steel elbow， degreasing solvent shall be appropriately added to make it fully soaked. After degreasing， pour out the solvent in the pipe， dry the pipe with exhaust fan， or dry it with oil-free compressed air or nitrogen， or dry it with natural air. Large diameter pipes can be manually scrubbed with cotton cloth dipped in solvent; The square tube can also be soaked in a long tank containing solvent for to minutes. The concentrated pipeline and equipment of the concentrated unit can be directly pumped and circulated with % concentrated for pickling after all installation. Pipes that cannot circulate or are not resistant to concentrated corrosion must be degreased separately.