It is divided into circular welded pipe and special-shaped (square， flat， etc.) welded pipe.
5It bears high internal working pressure.
xLas VegasIn order to make the welded pipe have the required mechanical， physical and chemical properties， in addition to the reasonable selection of materials and forming process， heat treatment process is often necessary. In addition，Products Show the mechanical，Oklahoma12Cr1MoVG high pressure alloy pipeWhat needs to be checked before equipment inspection operation physical and chemical properties of aluminum， copper， magnesium， titanium and their alloys can be changed by heat treatment to obtain different service properties.
Steel transfers heat excellently; Can withstand high temperature; Strong and strong materials; Probably a long time ago. In addition， there is the low cost of metal.
Vasma 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， resulting in uneven volume expansion and contraction， resulting in stress，Products Show 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， 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.
Zf Whether the mesh size and wire diameter of electric welding mesh meet the standards
Generally speaking， 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，Products Show the seamless pipe manufacturer needs to carry out off-line processing for its detection， and its strength is relatively high，Oklahoma12Cr1MoVG high pressure alloy pipeWhat needs to be checked before equipment inspection operation the pressure is high， and its advantages can be reflected in the material of mechanical structure. Seamless pipe can be divided into hot extrusion， hot rolling and cold rolling stainless steel pipe according to its rolling method. In addition， different elements can also be used for classification. The inner and outer surfaces of seamless pipes shall be free from chaps， cracks， cracks， scabs， delaminations and other defects. If these defects are to be removed，Reinforcement, galvanized pipe, seamless pipe, welded pipe, alloy pipe, I-beam-Shandong Kaiwen metal material Co., Ltd it is necessary to use machining. The removed seamless pipes shall not have negative deviation after the inner diameter is followed， If other minor surface defects with negative deviation cannot 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 and its depth shall not be greater than . mm.
Steel pipe with complex section -- unequal hexagonal steel pipe， five petal quincunx steel pipe， double convex steel pipe， melon seed steel pipe， conical steel pipe， corrugated steel pipe， watch case steel pipe and others.
uThe utility model has the advantages that the axial force of the roll is small the axial movement is small， and the working slope is not required，
CThe development of steel bar mesh is in line with the development of energy-saving economy
ZCustomer first The end span plate is connected with the load-bearing wall. The length of the surface mesh extending into the grid support shall not be less than mm， and a transverse reinforcement shall be provided at the end of the mesh or the extended reinforcement shall be bent.
tQ Sulfur is a harmful impurity in steel. Steel with high sulfur content is easy to embrittle during pressure processing at high temperature， which is usually called thermal embrittlement
When excavating a tunnel in a stratum where the rock is not hard and complete， it is generally necessary to excavate a diversion pit (also known as pilot hole) and set temporary support.
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.
How much is itkThe 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， most of the flat steel on the market are finished steel， which can be used ready-made for components， ladders， bridges and fences. Flat steel can also be used as blank for welding rigid steel and slab for laminated thin plate.
Wire 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.
jLas VegasSteel pipes can be classified by their models:
lGCutting machine， electric welding machine， polishing machine， electric hammer， etc
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， 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， etc.