Nansteel Manufacturing Co.,Ltd

  There are many ways to connect two seamless steel pipes (eg: ASTM A106 steel pipe ) together, but generally speaking, there are two major ways: one is detachable connection, the other is non detachable connection. Detachable connection refers to the removal after installation. Non detachable connection is to connect two seamless steel pipes together forever. The most commonly used method of non detachable connection is welding. Two seamless steel pipes are welded together by various welding methods. This method costs less, but it requires higher working environment. If the pipe is too long or the diameter is too large, it is not convenient to work after welding together.   The most commonly used detachable connections are   1 . Flange connection (easy assembly and disassembly, strong versatility).   2 . Union connection (Union is divided into thread type and welding type)   3 . Special pipe joint connection (internal thread, external thread and other forms). ...

  At present, the proportion of oil and gas transported by longitudinally welded pipes (eg: ERW steel pipe )  in the world is increasing, accounting for about 75%-95% of the total oil and gas.The scope of transportation is gradually expanding, not only petroleum and natural gas, but also various chemical industries. Raw materials and products, and the use of longitudinally welded pipes to transport solids has been studied. The development direction of longitudinally welded pipe pipeline transportation points to the direction of large diameter and high pressure.   The use of longitudinally welded pipes to transport fluids has the following advantages   1. The cost of infrastructure is low. Compared with railway transportation, the cost of infrastructure can be saved by one third, and the transportation volume is twice that of railway.    2. Simple construction, fast construction speed, generally laid underground, safe and reliable, and adapt to various terra...

  Low-temperature seamless steel pipes are mainly used in the production of ethylene, propylene, urea, synthetic ammonia, compound fertilizers, and other process equipment such as washing, purification, desulfurization, and degreasing in the pharmaceutical industry, as well as cryogenic equipment manufacturing, ultra-low temperature cold storage, and ultra-low temperature liquefaction. Gas pipelines and their pipe components, such as petroleum gas cryogenic separation equipment, air separation equipment, etc. There are two main types of low-temperature seamless steel pipe materials: austenitic and ferrite. The difference in crystal structure determines that the austenitic cryogenic pipe has no brittle transition temperature in the low temperature range. Generally, it is not necessary to verify its low-temperature impact toughness. It is used, but GB150-2011 stipulates that when the operating temperature is not lower than -196 ℃ (low temperature range), the impact test can be exemp...

  Coal-to-electricity conversion refers to the conversion of coal-fueled boilers and other tools used for heating to electric heating. Under current environmental protection requirements, it can only be changed to clean energy. Coal-to-clean energy accounts for about 80% of the share , It is widely used because of fast electric transmission and fast heating. The heat transfer from coal to electricity is still hot water, so hot water is still used to transport hot water. Insulating steel pipes still play an irreplaceable role in other conveying products in the coal-to-electricity conversion, because the heat loss of insulated steel pipes is very small when transporting the medium. In addition, the insulation steel pipe has a long service life, low cost, high social benefit, and simple construction. The insulation steel pipe also has an alarm line. Once there is water leakage, it will immediately report to the police to deal with hidden dangers in time. The superior performance of th...

 Heat treatment is a seamless steel pipe thermal processing technology that heats, heats, and cools seamless steel pipe in a certain medium, and controls its performance by changing the surface or internal crystalline structure of the material. In addition to annealing and tempering, there are three types of normal heat treatment processes: 1. Normalization Normalization processing, also called normalization processing. The normalizing treatment in the heat treatment process of seamless steel pipes is actually normalizing treatment. Usually in the hot working process, the structure of the seamless steel pipe material changes, and the performance also changes accordingly. In order to restore the structure to normal, normalizing treatment is often used, so normalizing treatment is also called normalization treatment. Normalization treatment can be used as a final heat treatment, or as a pre-heat treatment, and can also improve processing performance. In general, carbon steel normaliz...

  Regarding the selection of steel supporting structure steel pipe, which material is better for straight seam steel pipe and spiral steel pipe?   The following analysis gives an introduction from the comparison of the production process and price of the two steel pipes, which can give the practical user an intuitive understanding of the attributes and characteristics of the two steel pipes:   1. Comparison of production and manufacturing processes with materials:   Straight seam steel pipe process   1. Plate inspection: After the steel plate used to manufacture large-diameter LSAW steel pipe enters the production line, the whole plate is first subjected to ultrasonic inspection;   2. Edge milling: double-sided milling of the two edges of the steel plate with a milling machine to achieve the required plate width, plate edge parallelism and bevel shape;   3. Pre-bending: Use a pre-bending machine to pre-bend the edge of the board so that the edge of the...

  Polyurethane insulation steel pipe is a kind of insulation steel pipe product widely used at low pressure, mainly suitable for transporting hot and cold water, etc. However, the insulation effect of polyurethane insulation steel pipe directly depends on the effect of the polyurethane insulation layer.   The thermal insulation material used in polyurethane thermal insulation steel pipe is polyurethane foam. The following are the characteristics:   A. Low density and low thermal conductivity. Under normal conditions, the density of rigid polyurethane foam board is 35-40 kg/m3. But compared with other thermal insulation materials, rigid polyurethane foam has very good thermal insulation properties, that is to say, if it reaches the same thermal insulation performance, rigid polyurethane foam board is thinner than other materials. At the same time, the application of rigid polyurethane foam saves space.   B. Wide application temperature can be used normally between -40...