Alloy pipe is a kind of seamless steel pipe, its performance is much higher than that of ordinary seamless steel pipe, because this kind of steel pipe contains more Cr, its high temperature resistance, low temperature resistance, corrosion resistance performance is no other. Seam steel pipes are not comparable, so alloy pipes are widely used in petroleum, aerospace, chemical, electric power, boiler, military and other industries.
Alloy management theoretical calculation:
(outer diameter - wall thickness) * wall thickness * 0.02483 = weight per meter.
The material of the alloy tube is roughly: 16-50Mn, 27SiMn, 20-40Cr, 12-42CrMo
16Mn 12Cr1MoV T91 27SiMn 30CrMo 15CrMo 20G Cr9Mo 10CrMo910 15Mo3 15CrMoV 35CrMoV 45CrMo
Classification of alloy tubes:
Palladium alloy tubes are used for the separation of hydrogen and impurities.
The principle of hydrogen purification by palladium tube is that when the hydrogen to be purified is passed into one side of the palladium tube at 300-500 ° C, the hydrogen is adsorbed on the wall of the palladium tube. Since the 4d electron layer of palladium lacks two electrons, it is It can form unstable chemical bonds with hydrogen (the reaction between palladium and hydrogen is reversible). Under the action of palladium, hydrogen is ionized into protons with a radius of 1.5×1015m, while the lattice constant of palladium is 3.88×10- 10m (at 20°C), so it can pass through the palladium tube, and under the action of palladium, protons combine with electrons and re-form hydrogen molecules, which escape from the other side of the palladium tube. On the surface of the palladium tube, the undissociated gas is impermeable, so the palladium tube can be used to obtain high-purity hydrogen. Although palladium has unique permeation properties for hydrogen,
However, pure palladium has poor mechanical properties, is easy to be oxidized at high temperature, and has a low recrystallization temperature, which is easy to deform and embrittle the palladium tube, so pure palladium cannot be used as a permeable membrane. Adding an appropriate amount of Group IB and Group VIII elements to palladium to make a palladium alloy can improve the mechanical properties of palladium. In the palladium alloy of high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe used for shell and shaft tubes, silver accounts for about 20-30%, and the content of other components (such as gold, etc.) is less than 5%.
In the currently used palladium alloy, silver accounts for about 20-30%, and the content of other components (such as gold, etc.) is less than 5%. The rate of hydrogen permeation through the palladium alloy is related to the temperature, the thickness of the membrane, and the pressure difference (P) between the raw hydrogen and pure hydrogen on both sides of the permeation film. Increasing the temperature, increasing P and decreasing the thickness of the membrane increases the hydrogen permeation rate. However, increasing the temperature will reduce the tensile strength of the permeable membrane. Therefore, the use temperature of the palladium tube is usually controlled at about 450°C. Certain impurities can lead to palladium poisoning, worsen gas permeability, and even damage the membrane. Substances that can cause palladium poisoning are: mercury, arsenic, halide, oil vapor, sulfur- and ammonia-containing substances, and dust. Palladium alloys can be made into tubes (called palladium tubes) or membranes (called palladium membranes).
ABS alloy pipes and special cold melt adhesives are one of them. They are widely used in building water supply and central air conditioning, especially in building water supply risers and central air conditioning pipes. PC/ABS alloys can also be used to make automobile exterior parts, such as automobile wheel covers. , mirror housings, taillight covers, etc. PC/ABS has good formability and can process large automobile parts, such as automobile fenders.
As an important part of steel products, alloy pipes are divided into two categories: seamless steel pipes (round billets) and welded steel pipes (plates, strips) due to their different manufacturing processes and shapes of billets.
The principle of purifying hydrogen by palladium tube is that when the hydrogen to be purified is passed into one side of the palladium tube at 300-500 ° C, the hydrogen is adsorbed on the wall of the palladium tube. Because the 4d electron layer of palladium lacks two electrons, it can form incompatible with hydrogen. Stable chemical bonds (this reaction of palladium with hydrogen is reversible) under the action of palladium
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