ASTM A105 Weldneck Ring Type Joint Face Carbon Steel Flange
ASTM A105 Weldneck Ring Type Joint Face Carbon Steel Flange B16.5
ASTM A105 standard specifies the chemical composition, mechanical properties, heat treatment, test methods, and labeling requirements for carbon steel forgings used in pipeline components such as flanges, fittings, valve bodies, etc. A105 material belongs to ordinary carbon steel, and the manufacturing process is forging. It mainly uses processes such as hammering, extrusion, or rolling to cause plastic deformation of the metal billet in the hot state, refine the grain size, and improve the density, strength, and toughness of the material.
ASTM A105 carbon steel flanges are suitable for a temperature range of -29 ° C to 425 ° C. At temperatures exceeding 425 ℃ or higher, the strength of A105 carbon steel flanges will significantly decrease, exacerbating creep and stress relaxation, increasing graphitization tendency, and increasing long-term use risk. In higher working environments, alloy steel materials need to be selected.
Below 0 °C, the toughness of the material will decrease. If it needs to be applied to low-temperature environments such as -46 ° C, it is usually necessary to use materials that have been verified by notch impact testing. ASTM A105N is more suitable than A105, and "N" represents meeting the low-temperature impact requirements.
What is the difference between Carbon Steel ASTM A105 and A105N?
There is no difference in chemical composition between A105 and A105N in ASTM A105/ASME SA105 standards, but the standard stipulates that when there are auxiliary requirements for heat treatment in the order, letters will be added after A105 to distinguish them: A-annealing, N-normalizing, NT normalizing plus tempering, QT quenching plus tempering.
ASTM A105 Carbon Steel Flange Chemical Composition
| GRADE | C | Mn | P | S | Si |
| A105 | 0.35 max | 0.60-1.05 | 0.040 max | 0.04max | 0.35 max |
What are the advantages of weldneck flanges?
- Excellent structural strength and rigidity: The long neck design provides strong support for the flange, making it the strongest and most rigid of all flange types, suitable for high pressure, high temperature, high cyclic load, severe vibration, and situations requiring high bending strength.
- Excellent stress distribution: The conical transition of the long neck can smoothly disperse stress, greatly reducing stress concentration at the connection between the flange and the pipeline, and reducing the risk of fatigue failure.
- High sealing reliability: The neck flange has good rigidity and stress distribution, which helps to maintain the compression force of the gasket, providing more reliable and durable sealing performance, especially suitable for hazardous media such as flammable, explosive, toxic, harmful, or critical systems that do not allow leakage.
- Easy to install and align: A long neck helps to accurately align the pipeline before welding.
- Suitable for frequent disassembly and assembly: Due to its excellent structural strength, the necked flange can withstand multiple bolt tightening and disassembly.
- Convenient non-destructive testing: butt welds are easy to undergo non-destructive testing such as radiographic testing (RT) and ultrasonic testing (UT) to ensure welding quality.
ASTM A105 Carbon Steel Flange Typical applications
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Oil and Gas: Used for connecting various high-pressure, high-temperature process pipelines.
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Chemical and Petrochemical: Connections for reactors, towers, heat exchangers, and high-pressure process pipelines.
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Power Plants: Main steam pipelines, feedwater pipelines, and other high-pressure systems in thermal and nuclear power plants.
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Shipbuilding: Ship propulsion systems and piping.
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