DT1801 Permanent Yellow Pigment Permanent Yellow Pigment, international pigment, Benzimidazole ketone, permanent yellow Guangzhou Chengbian Chemical Technology Co., Ltd. , https://www.gzcbct.com
Steel Pipe
Steel pipes are hollow-section steel products with a length significantly greater than their diameter or circumference. Based on cross-sectional shape, they can be categorized into circular, square, rectangular, and special-shaped pipes. In terms of material, they are classified into carbon structural steel pipes, low-alloy structural steel pipes, alloy steel pipes, and composite steel pipes. These pipes serve various industries such as thermal equipment, petrochemicals, machinery manufacturing, geological drilling, and high-pressure systems. According to the production process, they are divided into seamless and welded steel pipes. Seamless pipes are further split into hot-rolled and cold-rolled (drawn) types, while welded pipes include straight-seam and spiral-seam varieties.
Steel pipes are not only used for transporting fluids, powders, and heat exchange but also serve as an economical building material. Using them in construction frameworks, columns, and supports can reduce weight by 20–40%, making it more efficient for factory-based mechanized construction. In highway bridges, steel pipes help save materials, simplify construction, and reduce the need for protective coatings, thus lowering investment and maintenance costs.
By production method, steel pipes are divided into two main categories: seamless and welded. Welded pipes, commonly known as welded pipes, come in different forms based on the welding process. They include furnace-welded, electric resistance-welded, and automatic arc-welded pipes. Additionally, they can be classified by seam type—straight or spiral—and by shape—round or special (such as square or flat).
Seamless steel pipes are typically made from high-quality carbon or alloy steel and are produced through hot rolling or cold drawing. On the other hand, welded pipes are manufactured from rolled steel plates with either butt or spiral seams. They are further categorized into low-pressure fluid transport pipes, spiral electric welded pipes, directly coiled welded pipes, and electric welded pipes. Seamless pipes are widely used in liquid, gas, and pneumatic pipelines across various industries, while welded pipes are common in water, gas, heating, and electrical applications.
In terms of material classification, steel pipes are divided into carbon pipes, alloy pipes, and stainless steel pipes. Carbon pipes can be further classified into ordinary carbon steel and high-quality carbon structural pipes. Alloy pipes include low-alloy, structural alloy, high-alloy, and high-strength tubes, along with specialized types like bearing tubes, heat-resistant, acid-resistant, precision alloys, and superalloys.
Based on connection methods, steel pipes are categorized into bare pipes (without threads) and threaded pipes. Threaded pipes are further divided into standard and thickened types, which may have internal, external, or both internal and external threading. Thread types also vary, including standard cylindrical or conical threads and special-threaded pipes. To meet user needs, threaded pipes are often supplied with pipe fittings.
Regarding surface coating, steel pipes can be either black (uncoated) or coated. Coated pipes include galvanized, aluminized, chrome-plated, and other alloy-layered pipes. These can have outer, inner, or double coatings, with common materials like plastics, epoxy resins, coal tar epoxies, and glass-based anti-corrosion coatings. Galvanized pipes, for instance, are further divided into KBG, JDG, and threaded types.
Steel pipes are also classified by their application. They are used in piping systems for water, gas, steam, oil, and natural gas. In thermal equipment, they include boiler tubes, superheater pipes, and high-pressure boiler pipes. In the machinery industry, they are used in aerospace, automotive, agricultural, and transformer components. For petroleum and geological drilling, they include drill pipes, casing, and core pipes. In the chemical industry, they are used for heat exchangers, acid-resistant lines, and high-pressure pipelines. They also find use in containers, instrumentation, medical devices, and more.
Finally, by cross-sectional shape, steel pipes are divided into round and special-shaped pipes. Special-shaped pipes refer to those with non-circular cross-sections, such as square, rectangular, oval, or custom designs, each suited for specific applications and performance requirements.
The international pigment index number of DT1801 permanent yellow is yellow No. 180. It is mainly used in inks and coatings. Its main characteristics are translucency, green phase, good fluidity, good light fastness, high storage stability, and not easy to stratify and precipitate. .