Galvanized qb square pipe for low pressure fluid transmission， Standard No.: gbt-. The representative materials are the same as above. It is mainly used for conveying low-pressure fluids such as water， air and oil and heating hot water or steam. The surface of square pipe shall be hot galvanized or cold galvanized.
2In order to ensure the stability of the perforation performance and chemical properties of the billet of the square tube， the technical regulations shall be strictly implemented in the operation of the circular furnace， the operation of the heating furnace shall be frequently， the abnormal conditions shall be handled in time and recorded，Rectangular Pipe and the follow-up posts and quality management department shall be notified in time for handling.
rFor transportation: water supply，Galvanized square pipe manufacturingWhat are the faults drainage， sewage treatment engineering， mud transportation， marine water transportation.
After the square tube is cut into a single square tube， the head and root of each batch of square tube shall be subject to strict first inspection. The mechanical properties， chemical composition， fusion condition， surface quality of square tube and NDT shall be carried out to ensure that the pipe making process is qualified before it can be officially put into production.
XGuyanaSquare tube is the main type of square tube. It is also very popular in the square tube market. There are many people doing this kind of thing， so there are many in the competition. The future market potential is huge. We should grasp this information well. In addition，Rectangular 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， 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
After perforation， the round tube blank is successively rolled by cross rolling， continuous rolling or rolling. Take off the pipe after sizing. The conical drill bit of the sizing machine rotates into the steel embryo at high speed to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the sizing machine bit. After sizing， the steel pipe enters the cooling tower for water spray cooling. After cooling， the steel pipe will be straightened. After straightening，Rectangular Pipe the steel pipe is sent to the gold pipe by belt
When processing the square tube， some processes need to heat the seamless square tube. The heating operation in the processing of the seamless square tube plays a very key role in the quality of the finished seamless square tube.
eThe disadvantage of empty bending is that when the upper and side synchronous empty bending，Galvanized square pipe manufacturingWhat are the faults due to the pressure generated by the upper roll and the lower roll at the same time， the forming force is easy to exceed the critical point. We sell all kinds of square tubes， rectangular tubes， seamless square tubes， galvanized square tubes and galvanized tubes. Welcome to telephone inquiry and sincerely invite cooperation! It will cause 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.
CAfter the sample is flattened to the specified flattening distance h， remove the load and remove the sample.
IWelcome calls How to reduce the amount of oxide scale is the key to the heating operation of seamless square tube. Especially when its hot. Starting from the service life of tools and the surface quality of pipes， the requirements are more stringent. For example， hot furnaces are divided into heating furnace and reheating furnace according to their functions; The former is used to heat the blank from normal temperature to processing temperature; The latter is used to reheat the blank to the necessary processing temperature during processing.
sJThe 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，Galvanized pipe_ Galvanized square pipe_ Seamless steel pipe_ Square tube - Wuxi Jiahang rectangular tubes， seamless square tubes galvanized square tubes and galvanized tubes， with large quantity， high quality and low price. It is fire-resistant， waterproof， high temperature resistant， durable， safe and reliable. It is mainly used to transport combustible and nonflammable fluids， with high requirements.
The advantages of real bending are small reverse， accurate forming， and as long as the roll shape is accurate， the R of inner corner forming is more accurate. The 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.
Stainless steel qb square pipe for fluid transportation， Standard No.: gbt-. The representative materials are Cr crni crni cr crninb， crnimo， etc. which are mainly used to transport low-pressure corrosive media.
Workshop costqClassification of surface treatment square pipe is divided into hot-dip galvanized square pipe， oiled square pipe and pickled square pipe according to surface treatment.
EPrinciple of cold drawing strengthening: the lattice defects of steel increase during plastic deformation electro galvanized square pipe， and the serious distortion of defect lattice will hinder the progress and slip of lattice， so the yield point of steel increases and the plasticity and toughness decrease. Due to the internal stress in plastic deformation， the modulus of steel decreases. The cold drawn reinforcement is stored at room temperature for ~ d or heated to ~ ℃ and maintained for a fixed time. This process is called aging treatment.
Strength structural steel， with carbon content of .% - .%， adding main alloy elements such as manganese， silicon， vanadium， niobium and titanium; Its total alloy content is %. According to the strength， and MPa.
tAccording 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.
eZTo sum up， improving the quality level of square tube is the key to ensure the service life of die. Therefore， when the economic cost and equipment conditions permit， the quality level of square tube， including surface quality and internal quality， should be improved as much as possible by using more mature process measures.
First， 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.