ASTM A105(N) Carbon steel flange is a type of pipeline connecting component, usually referring to a flange or end flange connector made of carbon steel, used for connecting and sealing between pipelines, containers or equipment, as well as at the end of pipe sections. This connection method allows fluid media (such as water, oil, gas, and chemicals) to be safely and reliably transported in the system, while also facilitating local disassembly and maintenance.
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Types of ASTM A105(N) Carbon steel flange
ASTM A105(N) Carbon steel flange are available in a wide variety of types, including:
- Blind Flange: A ASTM A105(N) Carbon steel blind flange is a type of flange that has no bore or opening, and it is primarily used for sealing the end of a pipeline or vessel opening.
- Slip-On Flange: A ASTM A105(N) Carbon steel slip-on flange is a type of flange that is slid over the pipe end and then welded in place. It is typically used for low-pressure applications.
- Weld Neck Flange: A ASTM A105(N) Carbon steel weld neck flange is a type of flange that has a long neck that accommodates the pipe and a raised face that offers excellent sealing properties. It is generally used in high-pressure applications.
- Threaded Flange: A grade ASME B16.5 Carbon steel threaded flange is a type of flange that has a threaded bore, and it is screwed onto the pipe end. It is ideal for low-pressure applications.
- Lap Joint Flange: A Carbon steel lap joint flange is a type of flange that is designed to be used with a lap joint stub end. The flange comprises of two parts that are bolted together, and the stub end is welded to the pipe.
manufacturing process of ASTM A105(N) Carbon steel flange
The forging process is to apply pressure to metal billets through forging machinery, causing them to undergo plastic deformation, thereby obtaining forgings with certain mechanical properties, shapes, and sizes.
The process of forging flanges generally includes selecting high-quality steel billets for cutting, heating, forming, and cooling after forging. Forging methods are divided into free forging, die forging, and membrane forging.
The casting process is a method of pouring molten metal into a mold, allowing it to cool and solidify to obtain castings with certain shapes and properties. The rough shape and size of the cast flange are accurate, the processing quantity is small, and the cost is low, but there is a risk of casting defects (porosity, cracks, inclusions).
Medium plate rolling is a process of cutting strips from medium plates and then rolling them into circles, which is commonly used in the production of large flanges. After successful rolling, welding is carried out, then flattened, and the process of processing the water line and bolt holes is carried out.
Carbon steel flange International standard system
The main flange standards internationally include American standard ANSI B16.5, European standard EN14420-2, and ISO international standard ISO 7005-1:2011. These standards specify the dimensions, pressure rating, materials, manufacturing tolerances, and testing requirements for flanges.
The American standard ANSI B16.5 is a widely used flange standard in North America, and its pressure rating adopts the Class marking system, which is divided into Class 150, Class 300, Class 600, Class 900, Class 1500 and Class 2500.
Carbon steel flange sealing performance
Carbon steel flanges have reliable sealing performance, and their sealing surfaces are usually designed as two opposing surfaces. The gasket is compressed and deformed through bolt pre tightening force, filling micro unevenness to achieve sealing.
Carbon steel flanges have wiping properties during the opening and closing process, so they can be used in media with suspended solid particles. This characteristic enables carbon steel flanges to maintain good sealing performance even in media containing particulate matter.
Carbon steel flange Mechanical performance
The heat resistance performance of carbon steel flanges is good. When the working water temperature is 70 degrees, the softening temperature is 140 degrees. This feature makes carbon steel flanges suitable for most industrial heating systems and hot water supply pipelines.
In addition, carbon steel flanges also have good impact resistance. Due to their unique impact strength performance, they have significantly improved compared to other solid wall pipes, and their ring stiffness is equivalent to 1.3 times that of solid walls.
