Alloy pipes are a type of seamless steel pipe with significantly enhanced performance compared to standard seamless steel pipes. This is because they contain higher levels of chromium, which greatly improves their high-temperature resistance, low-temperature resistance, and corrosion resistance. These properties make them far superior to seam steel pipes, and as a result, alloy pipes are widely used in industries such as petroleum, aerospace, chemical processing, power generation, boiler systems, and military applications.
The theoretical weight calculation for alloy pipes is as follows:
(Outer Diameter - Wall Thickness) × Wall Thickness × 0.02483 = Weight per meter.
Common materials used for alloy tubes include: 16-50Mn, 27SiMn, 20-40Cr, 12-42CrMo, 16Mn, 12Cr1MoV, T91, 27SiMn, 30CrMo, 15CrMo, 20G, Cr9Mo, 10CrMo910, 15Mo3, 15CrMoV, 35CrMoV, and 45CrMo.
Alloy tubes can be classified based on their application. For example, palladium alloy tubes are specifically designed for hydrogen purification by separating hydrogen from impurities. The process involves passing the hydrogen into one side of the palladium tube at temperatures between 300°C and 500°C. Hydrogen molecules are then adsorbed onto the surface of the palladium tube. Since palladium's 4d electron layer lacks two electrons, it forms unstable chemical bonds with hydrogen, allowing it to dissociate into protons. These protons, with a radius of about 1.5×10â»Â¹âµ meters, can pass through the palladium lattice, which has a lattice constant of 3.88×10â»Â¹â° meters at 20°C. Once on the other side, the protons recombine with electrons to form pure hydrogen gas. Impurities that do not dissociate remain on the surface, making the palladium tube an effective tool for obtaining high-purity hydrogen.
However, pure palladium has limited mechanical strength, is prone to oxidation at high temperatures, and has a low recrystallization temperature, leading to deformation and embrittlement. To overcome these issues, small amounts of Group IB and Group VIII elements are added to create palladium alloys. These alloys improve mechanical properties while maintaining hydrogen permeability. In typical applications, silver makes up about 20–30% of the alloy, with other components like gold present in smaller quantities (less than 5%).
The hydrogen permeation rate through palladium alloys depends on factors such as temperature, membrane thickness, and pressure difference across the membrane. Increasing temperature and pressure, or reducing membrane thickness, generally increases permeation rate. However, higher temperatures can reduce the tensile strength of the membrane, so the operating temperature is typically maintained around 450°C. Certain impurities—such as mercury, arsenic, halides, oil vapors, sulfur compounds, ammonia, and dust—can cause "palladium poisoning," degrading performance or even damaging the membrane. Palladium alloys can be formed into tubes or membranes for various industrial uses.
In addition to palladium-based alloys, there are also ABS alloy pipes, which are commonly used in building water supply systems and central air conditioning. They are especially suitable for vertical water supply risers and HVAC piping. PC/ABS alloys are also used in automotive applications, such as wheel covers, mirror housings, and taillight covers. These materials offer excellent formability, making them ideal for large automotive parts like fenders.
As an essential component of steel products, alloy pipes are broadly categorized into two types: seamless steel pipes (made from round billets) and welded steel pipes (formed from plates or strips). Each type has its own advantages and is selected based on specific application requirements. Whether in industrial, construction, or transportation sectors, alloy pipes play a vital role due to their superior mechanical and chemical properties.
Foam Pump,Centrifugal Froth Pump,Heavy Duty Oil Sand Handling Froth Pump,Centrifugal Vertical Froth Pump
Shijiazhuang Zhongjia Slurry Pump Co.,Ltd. , https://www.zhongjiapump.com