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Little-known facts about alloy elbows
Release time:
Feb 26,2021
Alloy elbows are a general term for various types of pipe bends. Their function is to connect two pipes with the same nominal diameter at pipe bends, enabling pipelines to make 90° turns or turns at other angles. Alloy elbows come in a wide variety of materials and have extremely broad applications. Ordinary bronze alloy elbows are commonly used in domestic water pipes; however, as living standards improve, many domestic water pipes have switched to stainless steel elbows.
An alloy elbow is a general term for various types of elbows. Its function is to connect two pipes with the same nominal diameter at pipe bends, enabling the pipeline to... 90° or other-angle bends. Alloy elbows come in a wide variety of materials and have extremely broad applications.
Ordinary bronze alloy elbows are commonly used in water pipes, but as living standards improve, many water pipes have switched to stainless steel elbows.
Alloy elbows made of manganese steel, thanks to their outstanding performance in withstanding impacts, compression, and material abrasion, are commonly used in concrete conveying pipelines, slurry pipelines, and other pipelines subject to severe wear and tear. High-manganese steel alloy elbows are suitable for pipelines with turbulent fluid flow and high impact forces. Nickel-steel alloy elbows are typically employed in pipelines that convey high-concentration oxidizing acids (such as nitric acid and sulfuric acid) at ambient temperatures; however, they will suffer severe corrosion when used in pipelines transporting reducing acids (such as hydrochloric acid and dilute sulfuric acid), unless the hydrochloric acid concentration is very low. Martensitic alloy elbows... Below 650℃, it exhibits high elevated-temperature strength, oxidation resistance, and resistance to water-gas corrosion; however, its weldability is relatively poor. Therefore, it is commonly used in high-temperature steam pipelines and water-gas pipelines.
Fun facts about alloy elbows:
Alloy elbow correction:
1. Alloy elbows should be corrected under static load; generally, localized hammering is not recommended.
2. After correcting the alloy elbow, stress-relief annealing should be performed at a temperature lower than the original tempering temperature.
Quality inspection of alloy elbows:
1. Alloy elbows shall be inspected according to the items and requirements specified in the relevant technical documents.
2. When the mechanical properties of alloy elbows fail to meet the specifications, they can be subjected to repeated heat treatments; however, the number of times quenching or solution treatment is repeated generally should not exceed two. Additional tempering of the workpiece does not count as a repeat treatment.
3. Before re-quenching alloy elbows that have been quenched or subjected to low-temperature tempering, they should be preheated, annealed, or subjected to high-temperature tempering.
4. The original records of heat treatment should be properly preserved for future reference.
Alloy Elbow Cleaning:
1. Depending on the requirements and surface condition of the alloy elbow, cleaning methods such as alkali washing, water-soluble cleaning agents, chlorinated solvent blasting, and shot peening are employed.
2. Alloy elbows are typically not cleaned by pickling.
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