15CrMo boiler tube

**15CrMo Boiler Tubes: Properties, Classification, and Applications** The **15CrMo boiler tube** is a type of high-quality carbon steel that incorporates one or more alloying elements to enhance its mechanical properties, toughness, and hardenability. These tubes typically require heat treatment processes such as normalizing or quenching and tempering. Depending on the application, components made from this material may also undergo surface treatments like carburizing, nitriding, or induction hardening. Due to its composition, heat treatment, and intended use, 15CrMo steel can be broadly categorized into three types: **carburizing steels**, **quenching and tempering steels**, and **nitriding steels**. Each category serves different functional purposes in industrial applications, especially in high-pressure and high-temperature environments. **Classification of High-Pressure Boiler Tubes:** 1. **High-quality carbon structural steels**: Common grades include 20G, 20MnG, and 25MnG. 2. **Alloy structural steels**: Examples are 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, and 12Cr3MoVSiTiB. 3. **Rust and heat-resistant steels**: Such as 1Cr18Ni9 and 1Cr18Ni11Nb. These materials must pass hydrostatic, flaring, and flattening tests in addition to meeting chemical and mechanical standards. The tubes are delivered in a heat-treated condition. In addition to these criteria, the final product must meet strict requirements for microstructure, grain size, and decarburization layer thickness to ensure quality and performance. **Specifications and Appearance Quality:** According to the GB5310-95 standard, seamless steel tubes used in high-pressure boilers have outer diameters ranging from 22mm to 530mm and wall thicknesses between 20mm and 70mm. Cold-drawn or cold-rolled tubes have smaller dimensions, with outer diameters from 10mm to 108mm and wall thicknesses from 2.0mm to 13.0mm. **Hydrogen Purification Principle:** When hydrogen is passed through a 15CrMo boiler tube at temperatures between 300°C and 500°C, the hydrogen molecules are adsorbed onto the inner surface. Palladium, which has a 4d electron layer lacking two electrons, forms unstable bonds with hydrogen. This process is reversible. Under the influence of palladium, hydrogen is ionized into protons with a radius of 1.5×10⁻¹⁵m. Since the lattice constant of palladium is 3.88×10⁻¹⁰m, these protons can recombine with electrons through the tube to form pure hydrogen gas, which exits on the other side. The undissociated gas cannot permeate the tube, making it an effective method for producing high-purity hydrogen. **Representation of 15CrMo Steel Grades:** - The first two digits in the steel grade indicate the average carbon content, expressed in ten-thousandths (e.g., 40Cr). - Main alloying elements are generally indicated by their symbols. If the average content is less than 1.5%, only the symbol is shown. For higher contents, the number is added (e.g., 2CrMo). - Microalloying elements like vanadium (V), titanium (Ti), boron (B), and rare earths (RE) are always included in the grade, even in small amounts (e.g., 20MnVB). - High-quality steel is marked with "A" at the end (e.g., 40CrA). - Special-purpose steels may have additional symbols (e.g., ML30CrMnSi for rivet screws). **Differences Between Alloy Pipes and Seamless Pipes:** While both alloy pipes and seamless pipes are types of steel tubes, they differ in classification. **Alloy pipes** are defined by the material used—specifically, they are made from alloy steel. **Seamless pipes**, on the other hand, refer to the production process, meaning they have no weld seam. In contrast, **seamed pipes** include straight-seam and spiral-welded pipes. It's important not to confuse the two, as they serve different purposes depending on the application. **Weight Calculation Formula for 15CrMo Boiler Tubes:** To calculate the weight per meter of a 15CrMo boiler tube: $$ \text{Weight (kg/m)} = \left[(\text{Outer Diameter} - \text{Wall Thickness}) \times \text{Wall Thickness}\right] \times 0.02466 $$ This formula helps in estimating the mass of the tube based on its dimensions, which is essential for engineering and logistics planning. By understanding the properties, classifications, and applications of 15CrMo boiler tubes, engineers and manufacturers can make informed decisions about their use in high-performance systems.

Powder Coating Classification

The company is a technical enterprise specializing in the research, development, production, sales and service of thermosetting powder coatings and water-based coatings. The company has the most complete production equipment and quality inspection equipment in China. It currently has three types of environmentally friendly coatings: general-purpose, special-purpose and functional. It has formed a variety of product series for different application fields and different performance effects. In the cooperation with many well-known international and domestic brand companies, our products have received unanimous praise and trust, and have established a solid cooperative relationship.

Chongqing Yitumei New Materials Co., Ltd. , https://www.cqettume.com