Alloy steel pipes are a type of seamless steel pipe known for their superior performance compared to standard seamless pipes. These pipes contain higher levels of chromium (Cr), which significantly enhances their resistance to high and low temperatures, as well as corrosion. Due to these enhanced properties, alloy steel pipes are widely used in industries such as oil, chemical, power generation, and boiler systems.
The principle behind hydrogen purification using 15CrMoG alloy steel pipes involves introducing hydrogen into one side of the pipe at temperatures between 300°C and 500°C. Hydrogen is adsorbed on the surface of the pipe, where it forms unstable chemical bonds with palladium due to its incomplete 4d electron layer. This allows hydrogen to be ionized into protons with a radius of approximately 1.5×10â»Â¹âµ m. The lattice constant of palladium is 3.88×10â»Â¹â° m at 20°C. Under the influence of palladium, hydrogen recombines with electrons to form hydrogen molecules, which then escape from the other side of the pipe. Non-dissociated gases remain trapped, resulting in the production of high-purity hydrogen.
In terms of designation, the first two digits of the steel grade indicate the carbon content, expressed in tenths of a percent. For example, 40Cr contains 0.4% carbon. Main alloying elements like chromium, nickel, and manganese are typically expressed in percentages. When the average alloy content is 2%, 3%, or more, it is indicated accordingly, as seen in 18Cr2Ni4WA. Microalloying elements such as vanadium (V), titanium (Ti), aluminum (Al), boron (B), and rare earths (RE) are also marked in the steel number, even though they are present in small amounts, as in 20MnVB.
High-quality steel grades are often marked with an "A" at the end to distinguish them from ordinary high-quality steels. Special-purpose alloy structural steels use suffixes to indicate their application, such as ML30CrMnSi for rivet screws.
While alloy pipes and seamless pipes may seem similar, they are fundamentally different. Alloy pipes refer to the material composition, meaning they are made from alloys, whereas seamless pipes refer to the manufacturing process, which eliminates the need for welding. There are also seam pipes, such as straight-seam and spiral-welded pipes.
Common materials for alloy pipes include 35CrMo, 16-50Mn, 27SiMn, 40Cr, Cr5Mo, 12Cr1MoV, 12Cr1MovG, 15CrMo, 15CrMoG, 15CrMoV, 13CrMo44, T91, 27SiMn, 25CrMo, 30CrMo, 35CrMoV, 40CrMo, 45CrMo, Cr9Mo, 10CrMo910, 15Mo3, A335P11, P22, P91, T91, and others.
To calculate the weight per meter of an alloy steel pipe, the formula is:
[(Outer Diameter - Wall Thickness) × Wall Thickness] × 0.02466 = kg/m
The mechanical properties of 15CrMoG high-pressure alloy pipes depend on their composition and heat treatment. When hardenability is the same, tensile strength and hardness are closely related. Tempering temperature varies depending on the alloying elements, affecting the final mechanical properties. The fatigue limit and impact resistance also vary based on the hardness level.
Structural strengthening in 15CrMoG alloy steel pipes occurs through microstructure changes during rolling and cooling. Different cooling environments lead to variations in bainite and martensite structures, influencing the mechanical properties. This allows for the production of pipes with varying strength levels to meet specific requirements.
For more information on alloy steel pipes and their applications, visit China Hardware Business Network at [http://news.chinawj.com.cn](http://news.chinawj.com.cn).
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