According to production， square tubes are divided into hot-rolled tubes， cold-rolled tubes， cold drawn tubes， tubes， pipe jacking，Seamless square tube etc. According to the section shape，140 galvanized square pipeWhat kind of stem is it the square tube is divided into round and special-shaped. The special-shaped tube has many complex shapes， such as square， oval， angular， angular， melon seed， shot blasting or pickling process is relatively clean， and the oxide scale and rust are removed， which improves the adhesion of the coating. When the installation site unconditionally adopts sand blasting and shot blasting，Seamless square tube but the derusting quality level must be reached.
The level of R-angle square tube is generally - times of the wall thickness. R-angle square tube of the size required by customers can also be produced according to the needs of customers; Square tube is a kind of long steel with hollow section and no joints around. It is a square tube formed by four sides of seamless tube mold. Square tube has hollow section. It is specialized in selling square tube， 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， high pressure boiler tubes， heat exchange tubes，Seamless square tube oil and other industries. It is stronger than welded and will not crack.
KKoi SanjaqThe cutting surface of the square tube shall be true circle， and the cutting line shall be at right angles to the axis of the square tube. Excessive force is the reason for cutting the square tube into flat or oval，140 galvanized square pipeWhat kind of stem is it so the square tube should be cut with appropriate force.
HfShot blasting is a high-speed rotating impeller that throws small steel shot or small iron shot out and hits the surface of the square tube at high speed， so the oxide layer on the surface of the square tube can be removed. At the same time， the steel shot or iron shot impacts the surface of the square tube at high speed， resulting in lattice distortion and deformation on the surface of the square tube， resulting in surface hardness， which is the key to clean the surface of the square tube
There are many forms of heating furnace， but the ring heating furnace is mainly used. The heating furnace has an annular furnace bottom， which can rotate slowly，Square pipe, square rectangular pipe, seamless square pipe, galvanized square pipe, galvanized pipe - Wuxi Jiahang metal products Co., Ltd the blank is loaded along the diameter direction of the furnace bottom from the inlet， and can be heated and homogenized to the specified temperature when it is used at the outlet. The production process of seamless square tube is relatively slow， and the heating operation especially needs patience. Because if the heating operation is not standardized， cracks， folding and eccentricity on the inner or outer surface of the tube blank will only produce waste products and defective products.
Surface adhesion resistance is an important feature of square tubes. At present， square tubes are mostly used for transportation， compression， bending and shear， the strength is also divided into tensile strength， compressive strength， flexural strength and shear strength. There is often a certain between various strengths. Generally， tensile strength is used as the basic strength indicator. Appropriate sites and warehouses shall be selected. The sites or warehouses for storing steel pipes shall be in clean and unobstructed places， away from factories and mines that produce harmful gas or dust. Weeds and sundries shall be removed on the site to keep the steel pipe clean; In the warehouse， it is not allowed to stack with acid， alkali， salt， cement and other materials that are corrosive to the steel pipe. Different types of steel pipes shall be stacked separately to prevent confusion and corrosion; Large section steel， rail， large-diameter steel pipe， forging， etc. can be stacked in the open air; Small and medium-sized section steel， wire rod， reinforcement medium diameter steel pipe， steel wire and steel wire rope can be stored in a well ventilated shed， but they must be covered and padded; Some small steel pipes， steel sheets， steel strips， silicon steel sheets， or thin-walled steel pipes， all kinds of cold-rolled and cold drawn steel pipes and high and corrosive metal products can be stored in the warehouse; The warehouse shall be selected according to geographical conditions， and generally adopts ordinary closed warehouse， the warehouse with roof， enclosure， tight doors and windows and ventilation devices; The warehouse is required to pay attention to ventilation in sunny days， close and damp proof in rainy days and often maintain a suitable storage environment. The principle of reasonable stacking and first in first stacking is to stack according to varieties and specifications under the condition of stable stacking and ensuring safety. Materials of different varieties shall be stacked separately to prevent confusion and mutual corrosion; It is forbidden to store articles that have corrosive effect on steel pipes near the stacking position; The bottom of the stack shall be padded high， firm and flat to prevent the material from moisture or deformation; The same kind of materials shall be stacked according to the warehousing order， so as to facilitate the implementation of the principle of first in， first out; The section steel stacked in the open air must be provided with wooden mats or strip stones. The stacking surface is slightly inclined to facilitate drainage. Pay attention to the straightness of the material placement to prevent bending and deformation; The stacking height shall not exceed m for manual operation， m for mechanical operation， and m for stacking width; A fixed channel shall be reserved between stacks， generally .m， and the access channel is generally ~ om depending on the size of materials and transportation machinery; The bottom of the stack shall be padded up. If the warehouse is cement floor， it can be padded up by .M; If it is muddy ground， it must be padded . ~ .m high. If it is an open site， the cement ground shall be padded with O & middot; ～O· m， . ~ . m higher than the sand and mud surface， i.e. the mouth shall face down， and the I-beam shall be placed vertically. The i-groove surface of the steel pipe shall not face up to avoid ponding and rust. The packaging and protective layer of the protective materials shall be coated with agent or other plating and packaging before leaving the factory， which is an important measure to prevent material corrosion. Attention shall be paid to protection during transportation， loading and unloading and shall not be damaged， The storage period of materials can be extended， the warehouse shall be kept clean and the maintenance of materials shall be strengthened. Before warehousing， materials shall be prevented from being drenched or mixed with impurities. Materials that have been drenched or contaminated shall be wiped according to their properties， such as steel wire brush for high hardness and cloth， cotton and other materials for low hardness; The materials shall be regularly after warehousing. If there is corrosion， the corrosion layer shall be removed; Generally， the steel pipe surface does not need to be coated with oil after being cleaned， but for high-quality steel， alloy steel sheet， thin-walled pipe alloy steel pipe， etc.， the internal and external surfaces need to be coated with anti rust oil before storage; Steel pipes with serious corrosion shall not be kept for a long time after rust removal and shall be used as soon as possible. With the development of economy， all kinds of square tubes， rectangular tubes， seamless square tubes， galvanized square tubes， galvanized square tubes have been sold at high prices throughout the country for a long time. The reasonable price and perfect service of galvanized tubes have been recognized by the majority of customers. There are more and more fake products in the market. In order to prevent yourself from being deceived when you are in square tubes， you need to know some knowledge about how to judge the authenticity of square tubes: & ldquo; We can judge by observing the surface and flatness of the square tube
LAmong them， qb square tube is divided into process & mdash& mdash; Arc welded square pipe， resistance welded square pipe (high frequency and low frequency)， gas welded square pipe and furnace welded square pipe are divided by weld & mdash& mdash; Straight seam welded square pipe， spiral welded square pipe.
GRespect for customersThe standard quantity of combustible and nonflammable square tubes is gbt- (gbt-). The representative material is l-l pipeline steel. It specializes in selling square tubes， rectangular tubes， seamless square tubes galvanized square tubes and galvanized tubes， high quality and low price. It is fire-resistant with large quantity， waterproof， high temperature resistant， durable， safe and reliable. It is mainly used to transport combustible and nonflammable fluids， with high requirements.
yJPerformance 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.
In the process of square pipe， we will conduct a variety of tests on it to ensure that the square pipe can be better used in practice. In order to make better use of large-diameter steel pipe， we will continue to innovate. Lets introduce the main elements contained in the lower pipe. For the martensitic chromium square tube， the main elements affecting the are chromium， carbon and molybdenum; For Martensitic chromium nickel square tube， the main influencing elements are nickel， molybdenum， aluminum cobalt， nitrogen and titanium.
Square tube saves raw materials: the material rate of cold parts can usually reach more than %. For example， the material rate of pin cutting of brand automobile is %， while the material rate when cold is used is increased to %; For another example， the material rate is increased from % in the past to%. It can be seen that the use of cold production of mechanical parts can save a lot of steel and non-ferrous metal materials.
Where to sell APIwUnder our actual investigation， Fangguan has a brand-new development
SGenerally， chemical and electrolytic pickling are used for pickling treatment. Only chemical pickling is used for pipeline which can remove oxide scale， rust and old coating. Sometimes it can be used as reprocessing after sand blasting. Although chemical cleaning can make the surface reach a certain cleanliness and roughness， its anchor lines are shallow and easy to pollute the surrounding environment. The square tube shall be submitted for acceptance in batches， and the batch rules shall comply with the provisions of corresponding product standards.
Square pipe is an important pipe. Its application in various fields has different performance. According to its different performance， we have carried out different transformation on the other pipe to ensure that the square pipe can be better used. We should make the right choice when purchasing. Below I will introduce the correct way of painting the lower pipe.
rDo a good job in the following aspects to effectively improve the service life of square tubes
fJAfter chemical treatment and surface treatment of the square tube， the appearance and quality of the square tube have been improved to another height， making the current square tube present in the market in a good state.
It is feasible to use the theory to calculate static structures， such as warehouses， houses and bridges， but it is not suitable for moving components such as wheels. At this time， people often use the plastic theory. The research of the plastic theory can be traced back to . In ， the European Design Association formulated a plastic design code， which is mainly used for static load plane beams and frame structures subjected to bending stress The solution is as follows: for high-rise buildings， more detailed calculations are needed.