15CrMo alloy seamless pipe is a kind of seamless pipe, and its performance is much higher than that of general seamless pipe. Because there are more Cr in this kind of pipe, and its high temperature, low temperature and corrosion resistance performance is not comparable to that of other seamless pipes, so alloy pipe is widely used in petroleum, chemical industry, electric power, boiler and other industries.
The principle of hydrogen purification in 15CrMo alloy seamless tube is that when the hydrogen to be purified is introduced into one side of 15CrMo alloy seamless tube at 300-500 ℃, the hydrogen is adsorbed on the wall of 15CrMo alloy seamless tube. Due to the lack of two electrons in the 4D electron layer of palladium, it can form an unstable chemical bond with hydrogen (the reaction between palladium and hydrogen is reversible). Under the action of palladium, the hydrogen is ionized into a half proton The diameter is 1.5 × 1015 m, and the lattice constant of palladium is 3.88 × 10-10 m (at 20 ℃), so it can pass through 15CrMo alloy seamless tube, under the action of palladium, protons and electrons combine and form hydrogen molecules again, escaping from the other side of 15CrMo alloy seamless tube. On the surface of 15CrMo alloy seamless tube, the gas that is not dissociated can't pass through, so we can use 15CrMo alloy seamless tube to obtain high purity hydrogen. Although palladium has a unique permeability to hydrogen, the mechanical properties of pure palladium are poor. It is easy to oxidize at high temperature, and the recrystallization temperature is low. It is easy to deform and embrittle the 15CrMo alloy seamless pipe, so pure palladium can not be used as the permeability membrane. The mechanical properties of palladium can be improved by adding appropriate IB and Ⅷ elements into palladium alloy. 11. Seamless steel tube for automobile axle sleeve pipe (gb3088-82) is a kind of high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel tube palladium alloy for automobile axle sleeve and driving axle shell pipe. Silver accounts for about 20-30%, and other components (such as gold) account for less than 5%.
[(outer diameter wall thickness) * wall thickness] * 0.02466 = kg / M (weight per meter)
15CrMo alloy seamless pipe knowledge
15CrMo alloy seamless pipe is a kind of hollow long steel, which is widely used as the pipeline for conveying fluid, such as oil, natural gas, water, gas, steam, etc. in addition, when the bending and torsional strength are the same, the weight is lighter, so it is also widely used in manufacturing mechanical parts and engineering structures. It is also commonly used to produce all kinds of conventional weapons, barrels, shells, etc.
Classification of steel pipe: steel pipe is divided into seamless steel pipe and welded steel pipe (seamed pipe). According to the section shape, it can be divided into 15CrMo alloy seamless pipe and special-shaped pipe. Circular steel pipe is widely used, but there are also some square, rectangular, semi-circular, hexagonal, equilateral triangle, octagonal and other special-shaped steel pipes.
Hydraulic pressure test shall be carried out for the steel pipes bearing fluid pressure to check their pressure resistance and quality. If there is no leakage, wetting or expansion under the specified pressure, it is qualified. Some steel pipes shall be subject to crimping test, expanding test, flattening test, etc. according to the standards or the requirements of the demander.
Seamless steel tube: seamless steel tube is made of steel ingot or solid tube blank through perforation and then through hot rolling, cold rolling or cold drawing. The specification of seamless steel pipe is indicated by outer diameter * wall thickness mm. Seamless steel pipes are divided into hot rolled and cold rolled (drawn) seamless steel pipes.
Hot rolled seamless steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipes.