. 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).
4 Cleaning: first， clean the grease， dust and other substances attached to the surface of the galvanized pipe after cleaning.
tPickeringAlloy pipes can be used for heating (cooling) projects.
The reinforced concrete surface reinforcement method has the advantages of simple construction technology and strong adaptability， which can greatly improve the bearing capacity， flexural stiffness and ductility of the brick wall. At the same time，Products Show its natural frequency can be changed to improve its performance in normal use. It is mainly applicable to the solid wall，كيلوناGB5310 سلس أنابيب الصلب المصنعةصيانة غير كافية ، احذر من العواطف porous hollow brick wall and mm thick empty bucket brick wall with no cracks and shear in the original wall.
TFlag pine gunWhat are the quality protection measures for galvanized pipe during welding
TsOn 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， and each part of workpiece will undergo phase transformation successively， 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.
The chemical composition of cold-rolled ribbed strip is the same as that of hot-rolled smooth round strip. It is rolled at room temperature with hot-rolled smooth disc strip，Products Show which is called cold rolling. Due to the reorganization of steel crystal structure by cold rolling process， high tensile strength (LL， ll， which has poor ductility and cannot be welded. If there are double-sided ribs and three-sided ribs etc.) is obtained， the specification allows LL to be used as stirrup. The design value of strength is limited to n / mm?.
The tensile strength of seamless pipe is more than ~ times that of ordinary steel， the elastic coefficient is better than that of steel and has good creep resistance， corrosion resistance and seismic resistance.
iGenerally， the process of pickling and passivation will be carried out for alloy pipes， but the alloy pipes after pickling and passivation are very easy to rust. Therefore， the way to find a solution to wiredrawing corrosion is "grinding and polishing". Due to grinding and polishing，Products Show there is no harm to carry out hot galvanizing in the middle and later stage.
Z The rapid popularization and application of cold drawn ribbed bars and hot rolled grade III bars in China provides a good material basis for the development of welded mesh. The formal implementation of welding net product standards and application procedures has played a positive role in product quality and accelerating popularization and application.
DdiscountGalvanized pipe cleaning， east-west derusting pickling and shot blasting
Generally speaking，كيلوناGB5310 سلس أنابيب الصلب المصنعةصيانة غير كافية ، احذر من العواطف the precision of seamless pipe is relatively low， and it is prone to uneven wall thickness， low surface luminosity and high customization cost. At the same time， some pits or black spots are easy to appear on the inner and outer surfaces. In addition to these， the seamless pipe manufacturer needs to carry out off-line processing for its detection， and its strength is relatively high， the pressure is high， and its advantages can be reflected in the material of mechanical structure. Seamless pipe can be divided into hot extrusion，Reinforcement, galvanized pipe, seamless pipe, welded pipe, alloy pipe, I-beam-Shandong Kaiwen metal material Co., Ltd different elements can also be used for classification. The inner and outer surfaces of seamless pipes shall be free from chaps， folds， cracks， scabs， delaminations and other defects. If these defects are to be removed， it is not a qualified product. The allowable depth diameter of straight path of seamless pipe is less than or equal to mm If other minor surface defects with negative deviation cannot be removed， and its depth shall not be greater than . mm.
They do not need to protect them from mechanical damage.
Quality improvementkIn hardware， you can choose an incomplete performance outside the product. Some construction experts claim that if there is a mechanical effect on these products， they are not suitable. At least this product is impossible.
QWhen we carry out different projects， we must use different raw materials， which can ensure the quality of the project. In many kinds of data， alloy pipe is widely used. In many projects， we will apply it， so it is very popular in the field. When people carry out the construction of alloy pipe project， there are many things that must be paid special attention to. Lets take you to know:
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， choosing a service provider with a self built logistics fleet can reduce the transportation cost， ensure the timeliness of delivery. After sales service， whether there is a sound and reliable after-sales service guarantee system， 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， without burr， 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.
cPickeringSpecial 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.
gA Main machines and tools
The fourth is the welding process method to ensure the strict implementation of the special operation method of galvanized pipe. The welding process includes pre welding groove inspection， control of welding process parameters and operation methods， post welding appearance quality inspection， and post welding nondestructive testing if necessary. Control the welding level and the amount of welding materials at each crossing.