Compression fittings are a crucial component for water and sewer systems. They allow the flow of fluids to be controlled and they are a great solution for removing contaminates. When you need to replace compression fittings, it is important to choose one that is corrosion-resistant and able to withstand various corrosive conditions. Here are some of the features of 904L compression tube fittings:
Common elbows
The common elbows of 904L compression tube fittings are available in different sizes and shapes. They are used for connecting two or more pipes, hoses, valves, and other products. These are made from special alloys. This is the reason for their high corrosion resistance.
They are manufactured according to the standards of ASME B16.9. Some of the dimensional tolerances are standardized. However, the wall thickness at the weld line is not standardized throughout the elbow.
They are available in short radius and long radius types. Short radius elbows are used in tight areas. Their centre-to-face dimension is less than 1.5 times the pipe diameter. On the other hand, long radius elbows are used when there is more space.
The pressure capacities of 904L stainless steel elbows depend on the nominal bore size. It also depends on the wall thickness of the pipe. Therefore, the SS 904L schedule 40 fittings have a thicker wall to increase the pressure capacity.
Resistance to oxidizing acids
The corrosion resistance of 904L compression tube fittings can be explained by the presence of a high nickel content. This makes the grade resistant to stress corrosion cracking and improves its pitting resistance. It is also a low carbon alloy.
Copper in the alloy adds good resistance to sulphuric acid. The low carbon content in the grade also reduces the risk of intergranular corrosion. In addition, the austenitic structure provides excellent toughness.
The alloy is resistant to stress corrosion cracking in chloride solutions. However, it is less resistant to nitric acid than grade 304L.
Aside from chloride, oxidizing acids include phosphoric and nitric. Stainless steel is resistant to these acids. These corrosion resistance properties make the grade suitable for use in a variety of applications.
Alloy 904L has good resistance to crevice corrosion in phosphoric, chloride and nitric solutions. However, the alloy has lower corrosion resistance in nitric and concentrated hydroxide solutions.
Aside from chloride and phosphoric acid, the alloy is also resistant to hydrogen sulphide. It has good resistance to sulphuric acid and most organic acids.
Resistant to sulphuric acid
Sulphuric acid corrosion is a common problem in sewer environments. This article focuses on materials that can resist this chemical. It is important to note that different materials show different levels of corrosion resistance. The selection of materials should be based on tests and experiments.
Carbon steels are widely used for equipment that handles sulfuric acid concentrations of up to 70%. However, this is only a part of the factors that must be considered. A protective sulfate film is also needed.
Alloy 400 is an alloy that has been extensively used in chemical processing equipment. Its corrosion resistance is strong and it has excellent mechanical properties at sub-zero temperatures. Additionally, the alloy is free from chloride stress-corrosion cracking.
Aluminum has very good corrosion resistance to sulfuric acid. It is often used for linings of steel equipment handling boiling sulfuric acid. In addition, it is a popular choice for electrolyte handling equipment.
Stainless steels are another option. Stainless steels are resistant to sulphuric acid, but they are not affected by oxygen. To ensure maximum corrosion resistance, it is advisable to choose materials with higher chromium content.
Weldability
If you want to purchase Stainless Steel 904L Compression Tube Fittings, you need to make sure that they are manufactured in accordance with international quality standards. Various industries are using these fittings for high temperature applications. These are able to provide leak-tight performance.
For these reasons, these fittings have become one of the most sought after products. They are also known for their excellent resistance against corrosion. In addition, they have a strong pressure and weight bearing capacity. This makes them a great fit for various industries. The most common ones include gas scrubbing plants, power plants and plumbing systems.
Aside from its good weldability, alloy 904L has a low carbon content. It also has a lot of nickel and copper. Moreover, its austenitic structure provides it with a lot of toughness and formability.
This alloy is used for applications that require moderate to high corrosion resistance. It is also known to exhibit good resistance to pitting corrosion in chloride solutions.
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