The use of welded steel mesh in China is still in its infancy. At present， 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.
4Since the s， with the rapid development trend of high-quality hot strip mill production and the development of electric welding and testing technology， the welding quality has been continuously improved，Products Show the types，انديانابوليس15CrMo سلس أنابيب سبائكدون قصة جديدة ، وتقلبات الأسعار تضعف specifications and models of welded steel pipes are increasing， and seamless pipes have been replaced in more and more industries. Welded steel pipes are divided into straight seam welded pipes and spiral welded pipes according to the way of welding. Classified by production mode: classified by processing technology - electric arc welded pipe resistor welded pipe， (high frequency， low frequency) gas welded pipe， furnace welded pipe.
mMilwaukeeThe finished product has smooth surface， low friction coefficient， flatness error + / - mm / m length， wear resistance and maximum temperature of ℃
Classification by end shape
WHenzadaThere are many processes in the process of welded pipe processing， and every detail needs our attention. Welded pipes need to be treated by various processes before application. Heat treatment of welded steel pipe is an important link in the process of welding steel pipe. Hot working is a metal hot working process in which metal materials are heated，Products Show insulated and cooled in a certain medium， and the metal properties are controlled by changing the metallographic structure on the surface or inside of the material.
MyDuring the heating and cooling process of structural welded pipe workpiece， due to the inconsistent cooling speed and time of surface layer and core layer， the temperature difference will be formed， resulting in uneven volume expansion and contraction， resulting in stress， namely thermal stress. Under the action of thermal stress， the starting temperature of the surface layer is lower than that of the core layer， and the shrinkage is greater than that of the core layer， making the core layer stretch. At the end of cooling，Products Show the surface layer is compressed and the core is stretched because the cooling volume contraction of the core cannot be carried out freely. That is， under the action of thermal stress，انديانابوليس15CrMo سلس أنابيب سبائكدون قصة جديدة ، وتقلبات الأسعار تضعف the surface of the workpiece is compressed and the core is pulled.
Because the zinc coating has excellent ductility， rolling， bending and so on without damaging the coating.
Check whether the manufacturers qualification， business license， organization code certificate， tax registration certificate， production and operation license and other qualification materials are complete. Look at the case， investigate the suppliers performance and the projects served in the past. Whether there is a self built logistics fleet or not，Reinforcement, galvanized pipe, seamless pipe, welded pipe, alloy pipe, I-beam-Shandong Kaiwen metal material Co., Ltd choosing a service provider with a self built logistics fleet can reduce the transportation cost， and more importantly， and timely solve quality problems in arrival acceptance and subsequent use. Check whether the quality assurance materials such as product quality certificate， material specification and warranty are complete. Check the appearance of the welded pipe， the surface is smooth and flat， the weld is dense， oil stain corrosion， extrusion deformation and flat cross section. Use a micrometer to check whether the outer diameter and wall thickness of the welded pipe meet the requirements， and the standard wall thickness deviation shall not exceed % - %. NDT shall be carried out for welded pipe with flaw detector. Conduct bending tensile strength test according to the requirements， bend the welded pipe for degrees， and there is no crack at the bend.
sApplication scope of alloy pipe
RThe surface of cold galvanized layer is smooth， dense and uniform. It has good mechanical properties and corrosion resistance. The consumption of hot-dip galvanized coating is between % - %. The galvanizing process is complex， but the thickness of single-sided coating， surface coating and double-sided coating is different， so the thin-walled pipe shall be galvanized. The zinc coating has strong protection and corrosion resistance.
ZLets seeNext， lets introduce the operation steps of roll adjustment during roll change. First of all， we must replace the specification and model of the welded pipe manufacturer. Generally， replace the complete set of rolls. The adjustment process of the rolls is as follows: first draw an axis from the channel of the generator set to the import and export with stainless steel wire for adjustment， so that the holes of each frame plate are on the same axis， and the bottom line of forming ethics meets the technical standards.
cQ As long as the pipe material is high-strength alloy steel， including alloy steel pipes with temperature resistance， pressure resistance， wear resistance and low temperature resistance， the welding process shall be focused on preventing the tendency of martensite structure and cracks due to welding high-temperature operation. The general process requirements are that the welding rod shall be selected and baked as required and sent to the welder for use. The oil and water shall be removed before welding on both sides of the weld Rust and sundries shall be removed and cleaned. The welding line energy shall be as small as possible to minimize the swing during the welding process. The arrangement of the last weld shall have annealing effect on the heat affected zone as far as possible. Slow cooling after welding， cover with asbestos cloth， etc.
Identification method of galvanized pipe
What are the quality protection measures for galvanized pipe during welding
market pricej Spray is OK. This method can not only completely remove rust， oxide and dirt， but also the welded pipe will be affected by abrasive impact and friction， resulting in the average roughness of the welded pipe.
WAiming at the connective tissue and texture produced in stainless steel plate Position and other crystal defects are generally removed by heat treatment processes such as quenching or quenching. The effect of quenching is to optimize the crystal eliminate structural defects， reduce strength， and also conducive to cold drawing. In the production and manufacture of cold drawn alloy pipe， quenching machinery and equipment cannot be lacked. Therefore， the formulation of appropriate annealing process is a necessary condition to ensure that the alloy pipe mechanism meets the standard and the commodity does not crack. If the manufacturer in order to better one sidedness， reduce the product cost and reduce the quenching process， it will eventually lead to bad harm to the product quality.
Are there many welded types of mesh produced? According to the welding type and overall improvement the difference between the reinforcement mesh and the welded mesh is not particularly large. It is still due to the scattered quality of the southern city. From the perspective of development to the longitudinal and transverse interleaving devices of the reinforcement mesh， the bound or welded mesh has better application quality.
zMilwaukeeSeamless pipe is made of steel block or solid pipe blank， and then made by hot rolling， cold rolling or cold dial. Seamless pipe plays an important role in Chinas steel pipe industry. Seamless pipe production processes are relatively rich， generally according to the corresponding steps of processing and production.
pTHow are seamless tubes made?
It has a thick and dense pure zinc layer covered on the steel surface， which can prevent the steel substrate from touching with any corrosion solution and maintain the steel substrate from corrosion. In general atmosphere， the surface of zinc layer forms a thin and dense zinc oxide layer， which is difficult to dissolve in water， so it plays a certain maintenance effect on steel matrix. If zinc oxide and other components in the atmosphere form insoluble zinc salts， the anti-corrosion effect is more ideal.