The 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.
7Classification by production method
xPrince George CityC - section steel is reliable and stable in stress， can be accurately positioned，Products Show and is resistant to impact and vibration Moreover，مدينة سانياMuhdpe سبيكة أنابيب كمحيوية سوق المؤسسة it has good versatility and combination， and has a variety of C-section steel and size selection to ensure its flexibility
The grid spacing size and number of reinforcement of electric welding reinforcement mesh are correct， which overcomes the phenomenon of large spacing size error and missing binding and buckle of binding quality caused by manual placement of reinforcement in traditional manual binding. The welded steel mesh has high strength and good elasticity. When pouring concrete， so as to achieve the goal of side-by-side average stress and bonding anchor.
FSagan Pipe installation:
Li Welded steel mesh， a new form of reinforcement， is especially suitable for large-area concrete engineering.
On the other hand， when the steel structure changes during heat treatment， that is austenite transforms into martensite， the increase of specific volume will be accompanied by the expansion of workpiece volume，Products Show resulting in inconsistent volume growth and structural stress. Due to the change of tissue stress， the tensile stress on the surface and the compressive stress in the heart are just opposite to the thermal stress. The magnitude of microstructure stress is related to the cooling rate， shape and chemical composition of martensitic transformation zone materials.
kUnder the action of thermal stress， because the initial temperature of the surface layer is lower than that of the heart and the shrinkage is greater than that of the heart， the heart is pulled. At the end of cooling， because the final cooling volume shrinkage of the heart cannot be carried out freely， the surface layer is compressed and the heart is pulled. That is under the action of thermal stress， the surface of the workpiece is finally compressed and the center is pulled. This phenomenon is affected by factors such as cooling rate， material composition and heat treatment process. The faster the cooling rate， the higher the carbon content and alloy composition the greater the uneven plastic deformation caused by thermal stress during cooling，Products Show and the greater the final residual stress. On the other hand， due to the change of microstructure during heat treatment，مدينة سانياMuhdpe سبيكة أنابيب كمحيوية سوق المؤسسة i.e. the transformation from austenite to martensite， the increase of specific volume will be accompanied by the expansion of workpiece volume， and each part of workpiece will undergo phase transformation successively， which is just opposite to the thermal stress. The microstructure stress is related to the cooling rate， shape and chemical composition of the workpiece in the martensitic transformation zone.
X The development of steel mesh has met the soft and hard conditions.
MWhere is good General carbon steel wire sleeve (GB / t- is a steel pipe used to protect wires in electrical installation projects such as industrial and civil buildings and installation of machinery and equipment.
iP Because zinc has excellent ductility and its alloy layer is firmly attached to the steel base， hot-plated parts can be formed by cold stamping， rolling， wire drawing bending and so on without damaging the coating;
The storage of galvanized pipes should pay attention to several points. The first is the storage location. It cannot be placed in the open air，Reinforcement, galvanized pipe, seamless pipe, welded pipe, alloy pipe, I-beam-Shandong Kaiwen metal material Co., Ltd because in the open air， not only the safety of various products such as theft， but also corrosion problems will occur. Open air sites are vulnerable to various extreme weather conditions. Large amounts of rain or snow will erode the zinc coating on the surface to the greatest extent， often warm spiral forming， double-sided submerged arc welding or high-frequency welding. It is used for foundation pile of civil building structure， wharf， bridge， etc.
Test conclusionz Because zinc has excellent ductility and its alloy layer is firmly attached to the steel base， hot-plated parts can be formed by cold stamping， rolling， wire drawing， bending and so on without damaging the coating;
H→ compared with general section steel， it has the advantages of low cost， high precision and small residual stress. It does not need expensive welding materials and weld detection， and saves about % of the manufacturing cost of steel structure.
vPrince George CitySpecial 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.
xHIdentification method of galvanized pipe
According to the diameter of the pipe， the pipe with small diameter can only be welded on one side and the technician can drill into the pipe to weld on both sides. Single side welding requires the welders technology， which can be formed by welding two on one side. Through the steel ball test， it can ensure that the cross-sectional area passing capacity and weld formation meet the design requirements.