Permanent Red Pigment, international pigment, red powder, red No. 170 Guangzhou Chengbian Chemical Technology Co., Ltd. , https://www.gzcbct.com
15CrMo boiler tube
**15CrMo Boiler Tube Overview**
The **15CrMo boiler tube** is a type of high-quality carbon structural steel that incorporates one or more alloying elements to enhance its mechanical properties, toughness, and hardenability. These materials typically undergo heat treatment processes such as normalizing or quenching and tempering. Components made from this steel often require additional treatments like quenching and tempering, surface chemical treatments (e.g., carburizing or nitriding), or surface hardening techniques like induction or high-frequency quenching.
Based on its chemical composition, heat treatment process, and intended use, 15CrMo steel can be broadly classified into three categories: carburizing steels, quenching and tempering steels, and nitriding steels.
**Classification of High-Pressure Boiler Tubes:**
1. **High-quality carbon structural steel grades** include 20G, 20MnG, and 25MnG.
2. **Alloy structural steel grades** consist of 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, among others.
3. **Rust and heat-resistant stainless steels**, such as 1Cr18Ni9 and 1Cr18Ni11Nb, are also commonly used. These tubes must pass hydrostatic, flaring, and flattening tests in addition to meeting chemical and mechanical property requirements. They are usually delivered in a heat-treated condition.
In addition, the final steel pipe must meet certain microstructure, grain size, and decarburization layer standards.
**Specifications and Appearance Quality of High-Pressure Boiler Tubes:**
According to GB5310-95, seamless steel tubes for high-pressure boilers have an outer diameter ranging from 22 to 530 mm and wall thicknesses between 20 and 70 mm. Cold-drawn or cold-rolled tubes have smaller dimensions, with outer diameters from 10 to 108 mm and wall thicknesses from 2.0 to 13.0 mm.
**Hydrogen Purification Principle Using 15CrMo Boiler Tubes:**
At temperatures between 300–500°C, when hydrogen gas is passed through one side of a 15CrMo tube, it is adsorbed onto the inner surface. Palladium, which has a 4d electron layer missing two electrons, forms unstable chemical bonds with hydrogen. This reaction is reversible. Under palladium’s influence, hydrogen becomes 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, allowing these protons to recombine with electrons on the other side of the tube, forming pure hydrogen molecules. Since undissociated gases cannot pass through, the 15CrMo tube effectively purifies hydrogen.
**Representation of 15CrMo Boiler Tube Grades:**
- The first two digits in the steel grade indicate the average carbon content, expressed in ten-thousandths. For example, 40Cr.
- Main alloying elements are generally denoted by their symbols. If the average content is less than 1.5%, only the symbol is shown. For instance, "12CrMoV" vs. "12Cr1MoV" indicates different chromium levels.
- Microalloying elements like vanadium (V), titanium (Ti), aluminum (Al), boron (B), and rare earths (RE) should always be included in the grade, even if present in small amounts.
- High-quality steel grades end with "A" to distinguish them from standard quality steels.
- Special-purpose alloys may have a prefix or suffix indicating their application, such as ML30CrMnSi for rivet screws.
**Difference Between Alloy Pipes and Seamless Pipes:**
Although related, alloy pipes and seamless pipes are not the same. An **alloy pipe** refers to the material used, meaning it is made from an alloy. A **seamless pipe**, on the other hand, refers to the manufacturing process, meaning it has no weld seam. Seamed pipes, including straight-seam and spiral-welded types, are different from seamless ones.
**Weight Calculation Formula for 15CrMo Boiler Tubes:**
To calculate the weight per meter:
$$
\text{Weight (kg/m)} = \left[(\text{Outer Diameter} - \text{Wall Thickness}) \times \text{Wall Thickness}\right] \times 0.02466
$$
This formula provides a practical way to estimate the mass of each section of the tube, making it useful in engineering and procurement contexts.
The international pigment index number of F5RK permanent red is red No. 170. It is widely used in coatings, inks, cosmetics and plastics. Its main features are translucency, blue-red color, high chroma, good fluidity, high temperature resistance and good weather resistance. .