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Define the Various Grades of Carbon Steel Flanges

Carbon steel flange and end flange connectors are made of carbon steel. Common standards include ASTM A694, ASTM A105N (SA105N), MSS SP-44, DIN 2533. When you accompany, pressure ratings are from class 150 to 2500.

Carbon Steel flange

Carbon steel has a carbon content of up to 2.1% by weight. AISI defines it as:

  • No alloy element (minimum content) is required, as of Va, Ti, Ni, Mo, Cr, etc.
  • The specified minimum of Cu shall not exceed 0.04%.
  • Maximum Mn 1.65%, Si 0.06%.

As the carbon element content increases, the steel becomes more robust and complex after the heat treatment. On the contrary, it becomes less ductile. When without any heat treatment, higher carbon reduces weldability.

Carbon steel may include alloy steel in case it is not helpful as stainless steel.

Different grades of carbon steel flanges

The main component in manufacturing carbon steel flanges is carbon and iron steel. The forged carbon steel flanges help connect pumps, valves, or other equipment—the grade of steel changes on the material and its carbon content.

The different grades of carbon steel flanges are ASTM A350, ASTM A516, ASTM A694, ASTM A182, and ASTM A105. About 1% to 2% is the weight of the carbon in the carbon steel flanges.

The increase in carbon content in the element makes steel stiffer and sturdier. It also makes things less ductile. Higher carbon may reduce weldability if not treated with high heat.

Carbon steel A105 Flanges

Carbon steel A105 flanges are forged steel piping components that are useful for flanges, fittings, and valves in pressure systems at higher temperatures. You can operate on carbon steel flanges between 0 degrees to 550 degrees.

It is suitable for marine engineering and hydrocarbon processes. It has been helpful in gas, oil, and nuclear power plants equipment, valves manufacturing, petrochemical plants, pump manufacturing plants, and other places.

Carbon steel A350 LF2 Low-temperature flanges

Carbon steel A350 LF2 flanges are made with ring-rolled carbon flanges, forged fittings, low alloy steel forged, and valves for low temperatures. These flanges come with extensive pressure resistance, strength, and durability.

The type of carbon steel flange provides machinability when it is forged and hardened. It offers moderate strength. It is mainly in high demand because of its high hardness.

Carbon steel low Alloy A182 Flanges

The carbon steel grade is helpful for stainless steel pipe flanges, valves, and other high-temperature services. The type of steel suits the low corrosion applications. These flanges do not wear out quickly. These flanges are widely used, mainly in the petroleum, paper, and chemical industries.

The features of these flange types suit the most as it stays for a more extended period. It does not require repair after the installation. If you purchase these products from the right place, it will help you ensure their durability.

Carbon Steel A694 flanges

It is the most carbon stress-reliant steel flange material. It suits the high-pressure transmission of oil and gas piping. The products made with this steel are usable in the high-yield service.

The manufacturers of this steel need to build steel that can withstand cryogenic, high temperatures. The high carbon content with heat treatment makes it less ductile. If there’s a lack of heat treatment, it may reduce its ability to weld.

Forged carbon steel flanges

There are different ways you can manufacture flanges. The most prominent way is to forge and cast it. Flanges are plate-like devices that can be added at the end of the pipe; a valve and fitting can put a piping system altogether.


The manufacturers develop flanges that are useful in fittings and pipes. Forged steel has the best mechanical properties than any other product. It has excellent use for industrial purposes. It is often used with an attachment of a valve at the pipe end. It also functions for outlets and inlets.

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