Pure zinc layer is a plastic zinc layer in hot-dip galvanizing. Its properties are basically close to pure zinc and have ductility， so it is flexible.
8Steel pipes can be classified by their models:
yGuadalupeI-beam has wide flange， thin web， many specifications and flexible use. It can save metal by % ~ % when used in various truss structures. Because the inner and outer sides of the flange are parallel and the edge end is at right angles， it is easy to assemble and combine into various components， which can save about % of the welding and riveting workload greatly accelerate the construction speed of the project and shorten the construction period.
Longitudinal welded pipe has the advantages of simple production and processing technology，Products Show high production efficiency，mercedesA335p11 American standard high pressure alloy pipeHow to maintain good daily work low cost and rapid development trend. The compressive strength of spiral welded pipe is generally higher than that of straight welded pipe. Narrow blank can be used to produce welded pipe with large pipe diameter， and blank with the same total width can also be used to produce welded pipe with different pipe diameter. However， compared with the straight seam pipe with the same length， and the production rate is low.
VGiberuva Whether the mesh size and wire diameter of electric welding mesh meet the standards
VwThere are several ways to clean galvanized pipes
Quality requirements
The electric welding reinforcement mesh can reduce the damage and consumption to the reinforcement processing process. According to statistics， after deducting the steel consumption increased by unit lapping， it can also save about % of the steel. After it is transported to the site according to the construction degree of the project， it can be hoisted to the working face. There is no need to set a reinforcement processing site on the site， which saves the site and increases the management level of the site. At the same time， it can also solve the problems of noise pollution caused by straightening reinforcement.
h Remove defective pipes within the allowable length.
S Phosphorus: it can significantly reduce the plasticity and toughness of steel，Products Show especially at low temperature. This phenomenon is called cold brittleness. In high-quality steel， sulfur and phosphorus should be strictly controlled. On the other hand， low carbon steel contains high sulfur and phosphorus， which can make it easy to cut， which is beneficial to improve the machinability of steel
IInspection itemsThe 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.
iL Pipe installation
During 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，Products Show resulting in uneven volume expansion and contraction， resulting in stress，mercedesA335p11 American standard high pressure alloy pipeHow to maintain good daily work namely thermal stress. Under the action of thermal stress， and the shrinkage is greater than that of the core layer， making the core layer stretch. At the end of cooling， 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， the surface of the workpiece is compressed and the core is pulled.
Third， the widening part of the bridge deck is poured with concrete， and the concrete of the bridge deck pavement is poured at the same time to form a carriageway. The reinforcement mesh is set on the bridge deck pavement and the widening part of the bridge deck to strengthen the overall performance. Fourth，Reinforcement, galvanized pipe, seamless pipe, welded pipe, alloy pipe, I-beam-Shandong Kaiwen metal material Co., Ltd and the carriageway pavement is extended and erected on the cantilever beam.
Quality improvementyThere are many types of galvanized pipes， mainly including cold plated seamless pipes and hot-plated seamless pipes. But now the previous one is no longer used. The hot-dip seamless tube is still in use. Hot dip galvanized pipe is mainly used for steel pipes with low pressure fluid such as water and gas. When in use， if in normal working environment， the thickness of galvanized layer of hot-dip galvanized seamless steel pipe is up to μ M above， and it has been used safely for about years. It can be seen that its service life is very long. Of course， when purchasing， we should also find regular manufacturers to order. Only in this way can we achieve this service life. As long as the galvanized pipe is cleaned after pickling， it is basically cleaned in ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank. In order to ensure the quality， electro galvanizing will not be used. There are also some small enterprises in the market. They will use electro galvanizing in production. In this way， although it is much cheaper in price. However， the quality is very good when used， and it is also easy to have problems.
H Remove defective pipes within the allowable length.
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.
bGuadalupeSpecial shaped pipe: square pipe， rectangular pipe cap pipe， steel pipe for hollow rubber steel doors and windows welded by general carbon structure steel and Mn steel strip， mainly used as agricultural machinery components， steel windows and doors， etc.
oSSeamless pipe production process
Emulsified asphalt emulsion is also easy to use on the mobile slurry seal paver. It is necessary to mix on the machine and use additives for chemical control for maintenance.