Since 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， the types， 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，Products Show resistor welded pipe，Un banc de sable.A335p9 tubes en alliage haute pressionQuelle est la classification et la performance de (high frequency， furnace welded pipe.
3In the production process， the stainless glittering pipe is affected by the outside and product surface. Due to galvanizing， the corrosion protection is not corroded. This is the thickness of zinc， and the quality and strength of its coating depend on longevity.
lRay pontiniAfter the passivation treatment of alloy pipe， ~ times of water cleaning， and then chromic acid closed solution shall be carried out. Chromic acid solution must be carried out h after the subsequent water cleaning of metallographic structure and austenitic alloy pipe. Chromic acid aqueous solution (mass ratio) is % ~ % the solution temperature is ~ ℃， and the solution time is min. Then dry.
The cold-rolled stainless steel pipe has the advantages of large yield coefficient， no expansion，Products Show bending and so on. In order to reach the health grade standard of stainless steel pipeline， the pipeline after cold rolling must undergo bright annealing， demagnetization， pickling calibration and other procedures.
LHeinola The preparations for the construction of high-speed reinforcement mesh include the preparation and inspection of raw materials， the inspection and acceptance of the lower layer of the pavement， and the preparation of construction equipment and engineering machinery.
JnThe preparations for the construction of high-speed reinforcement mesh include the preparation and inspection of raw materials， the inspection and acceptance of the lower layer of the pavement， and the preparation of construction equipment and engineering machinery.
Galvanized pipe is actually galvanized pipe. This is mainly because it increases the corrosion resistance of the steel pipe， so it is evenly coated with a layer of zinc. It can prevent the erosion of other chemicals such as and steam， and protect the steel strip. It is non-destructive and effectively prolongs its service life. Generally，Products Show the steel strip purchased is rolled into a large number by the galvanized pipe manufacturer， so pay attention to it during storage.
However，Un banc de sable.A335p9 tubes en alliage haute pressionQuelle est la classification et la performance de compared with plastics， these pipes， like other metals， remain stable and will not be affected by high temperature.
fc.quality inspection is carried out for alloy pipes， so that the whole process of steel pipe processing is under reasonable inspection and supervision， and the product quality is reasonably guaranteed.
F If the surface of the welded pipe is rusty， we can polish the appearance of the welded pipe with a wire brush to prevent rust.
UrankingIn order to improve the corrosion resistance of steel pipe， the general steel pipe (black pipe) is galvanized. The galvanized pipe is divided into hot-dip galvanizing and electric steel zinc. The hot-dip galvanizing layer is thick and the cost of electric galvanizing is low，Reinforcement, galvanized pipe, seamless pipe, welded pipe, alloy pipe, I-beam-Shandong Kaiwen metal material Co., Ltd so there is galvanized pipe.
uEGalvanized pipe has excellent corrosion resistance. Compared with traditional steel， this kind of pipe has strong resistance to baking. In case of critical situation， it will not lead to the collapse of building structure in a short time. In addition， this kind of pipe also has a practical advantage， that is it is more convenient and lighter when carrying out the construction and installation. The operators save time and labor when carrying out the construction， and the operation efficiency has been greatly strengthened. In this regard， it is not difficult to understand why the galvanized pipe is so favored by various construction units.
There are five main guarantee measures for steel pipe welding. If these five aspects are guaranteed， the quality of galvanized pipe can also be guaranteed.
Idler pipe: it is used for electric welding steel pipe of idler of belt conveyor. It is generally made of Q， QA， B steel and steel， with a diameter of -mm. There are certain requirements for pipe tortuosity， end face straightness with the center line and ovality. Generally， water pressure and flattening tests are carried out.
Inspection requirementsmWire sleeve: it is also a general carbon steel welded steel pipe. It is used in concrete and various structural power distribution projects. The commonly used nominal diameter is from -mm. The wall of wire sleeve is thin， which is mostly used after coating or galvanizing， and cold bending test is required.
ZWhen selecting I-beam in structural design， reasonable I-beam shall be selected according to its mechanical properties， chemical properties， weldability and structural size. I-beam is mainly divided into ordinary I-beam， light I-beam and wide flange I-beam. According to the height ratio of flange to web， it is divided into wide， medium and narrow flange I-beams.
If the surface of the welded pipe is rusty， we can polish the appearance of the welded pipe with a wire brush to prevent rust.
rRay pontiniWhat is theof defect detection of seamless pipe? Magnetic particle testing or penetrant testing of seamless pipes can effectively find surface defects such as cracks， folds double skin， hair lines， pinholes and so on. Because of its high detection sensitivity， magnetic particle detection method should be preferred for ferromagnetic materials. For non ferromagnetic materials， such as stainless steel seamless pipe， penetrant testing method is adopted.
aUThe advantage of the reinforcement mesh system is ecological. It is filled with natural stone materials. There is a gap between the stone materials to allow plants to grow in it. It can also plant plants on it. It has the dual effects of engineering slope protection and plant slope protection. The Ecological Grid mat is a combination with a height of cm ~ cm， mostly a multi grid box separated by spacer mesh.
Galvanized pipe can be seen from its name. It is a square pipe type. Many materials can form galvanized pipe body. It is used for what purpose and where. Most galvanized pipes are steel pipes. After unpacking， leveling， crimping and welding， they form round pipes， which are rolled into square pipes， and then cut into the required length. Generally， there are galvanized pipes in each package. In terms of spot， most of them are in large specifications， ranging from * * .- to * * - Galvanized pipes are divided into structural galvanized pipes， decorative galvanized pipes， architectural galvanized pipes， mechanical galvanized pipes