Welded steel pipe， also known as welded pipe， is a seamless steel pipe made of thick steel plate or hot-rolled strip by electric welding after coiling and forming， generally with a fixed length of m. Welded steel pipe has the advantages of simple production and processing process， high production efficiency， many types，Products Show specifications and models，Chicago09CrCuSb alloy pipeBriefly describe the main points of operation and maintenance and less investment in machinery and equipment projects， but the general compressive strength is less than that of seamless pipe.
5Classification by wall thickness
yPhiladelphiaApplication characteristics of I-beam
Because the combination is strong， zinc iron is miscible and has strong wear resistance;
RMa muchuHardness of reinforcement construction of reinforced mesh on concrete bridge deck; Including key lime mixing and packaging materials， you need to pay attention to calculating the size of the building， and the calculated specifications must meet the quality standards and construction standards.
IyDue to the impact of poor visual . Only through the application of mesh and the overall stiffness can we see the potential of demand. The application of steel data is a high one， such as the reuse rate of mesh and reinforcement installed in the current mesh production company and the treatment of corrosion. The design strength value of circular reinforcement and the design strength value of welded reinforcement mesh. According to the equal strength substitution principle and considering comprehensive factors， the use of steel welded mesh plate can save the use of steel bars in the steel welded mesh plate factory. And the reinforcement mesh needs to be processed after it is shipped to the site， which is called cold rolling. Due to the reorganization of steel crystal structure by cold rolling process， high tensile strength (LL，Products Show ll， ll， etc.) is obtained， which has poor ductility and cannot be welded. If there are double-sided ribs and three-sided ribs， the specification allows LL to be used as stirrup. The design value of strength is limited to n / mm?.
Galvanized pipe: the hot-dip galvanized pipe base plate and molten electroplating solution are combined physically and chemically to form a dense corrosion-resistant structure of zinc iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel pipe substrate. Therefore it has strong corrosion resistance.
yH-beam is a widely used profile in steel structure buildings. It is different from I-beam. The first is the flange， and the second is that the inner surface of the flange has no inclination， and the upper and lower surfaces are parallel. The section characteristics of H-beam are obviously better than those of traditional I-beam， the use of welded steel mesh in China accounts for less than one of the total amount of steel reinforcement. In the early s， steel welded mesh was listed as a key implementation project by the science and Technology Commission and the Ministry of construction， and specifications and procedures were formulated.
WPricePipelines of various specifications and models are complete.
bUSpiral welded pipe: it is made by rolling low-carbon structural steel or low-alloy structural steel strip into pipe blank according to the viewpoint of certain spiral line (called forming angle)，Products Show and then welding the pipe seam. It can produce large-diameter steel pipe with narrow strip steel. Spiral welded pipe is mainly used for oil and natural gas transportation pipeline， and its standard is expressed by outer diameter * wall thickness. Spiral welded pipe has single-sided welding and double-sided welding. The welded pipe shall ensure that the hydrostatic test，Chicago09CrCuSb alloy pipeBriefly describe the main points of operation and maintenance tensile strength and cold bendingof the weld meet the requirements.
. the straight length of the hook of the surface mesh reinforcement at the grid support shall not be less than mm and the bending diameter shall not be less than D (D is the reinforcement diameter).
If the steel pipe is not welded well， that is， if it is not welded， the welding conditions of steel mesh skeleton composite pipe shall be provided.
Encyclopedic knowledgeoSpiral welded pipe: it is made by rolling low-carbon structural steel or low-alloy structural steel strip into pipe blank according to the viewpoint of certain spiral line (called forming angle)， and then welding the pipe seam. It can produce large-diameter steel pipe with narrow strip steel. Spiral welded pipe is mainly used for oil and natural gas transportation pipeline， tensile strength and cold bendingof the weld meet the requirements.
G Remove defective pipes within the allowable length.
Longitudinal welded pipe has the advantages of simple production process， high production efficiency， low cost and rapid development. The strength of spiral welded pipe is generally higher than that of straight welded pipe. It can produce welded pipe with larger pipe diameter with narrow blank，Reinforcement, galvanized pipe, seamless pipe, welded pipe, alloy pipe, I-beam-Shandong Kaiwen metal material Co., Ltd and welded pipe with different pipe diameter with blank of the same width. However， compared with the straight seam pipe with the same length， the weld length increases by ~ ， and the production speed is low. Welded pipes with large or thick diameter are generally made of steel blank directly， while small welded pipes and thin-walled welded pipes only need to be welded directly through steel strip. Then after simple polishing， wire drawing is OK. Welded pipe is welded with strip steel， so it is not as high as seamless pipe in its original position. Welded pipe process: uncoiling of raw materials - leveling - end shearing and welding - looper - forming - Welding - removal of internal and external weld beads - pre correction - induction heat treatment - sizing and straightening - eddy current testing - cutting - hydraulic inspection - Pickling - Inspection (strict control) - Packaging - delivery.
nPhiladelphia Chromium can improve the hardenability and wear resistance of steel and improve the corrosion resistance and oxidation resistance of steel
lEGalvanized pipe has excellent corrosion resistance
According to the pipe wall thickness， pipes made of relatively thin materials such as steel strip can be welded with high frequency， and some thin-walled pipes can be welded with shielding gas; Pipes with wall thickness more than mm can be welded by hand.