Stainless Steel Forged Flange

Stainless steel flanges are vital components in various industrial processes, serving as connectors or joint pieces between pipes, valves and other equipment. Made from a blend of iron, chromium and nickel, stainless steel flanges boast exceptional strength and resistance to corrosion, making them suitable for use in harsh environments. These versatile flanges come in different shapes and sizes to suit the diverse needs of industries such as oil and gas, chemical processing, pharmaceuticals, water treatment, etc. They also offer excellent sealing capabilities to prevent leakages and ensure a safe working environment.

Corrosion And Stain Resistance:

Stainless steel flanges are excellent in a wide range of atmospheric environments and many corrosive media. It is resistant to crevice and pitting corrosion in warm chloride environments. It is also resistant to corrosion that cracks below approximately 60°C.

Versatility And Strength:

You can add different materials like nitrogen, molybdenum, nickel to stainless steel to enhance the corrosion-resistant properties. ASTM A182 specified flanges can handle extreme temperatures and have higher strength at elevated temperatures above 500°C up to about 800°C.

Appearance:

Stainless steel flange are one of the excellent choices for commercial establishments. The reason is that the material has a naturally elegant and shiny look compared to weathered carbon.

Value:

When you use stainless steel flange, you buy durable products that will help your projects last longer for decades. It is a reliable material that is easy to install and maintain. Stainless steel is one of the low-maintenance metals because of its non-corrosive properties. It is unlikely that it needs a replacement for decades.

Material Benefits:

The combination of corrosion resistance with high strength allows a reduction in flange weight and thickness. Stainless steel can withstand even high flow rates – over 40m/s – that makes it capable of resisting even long-term exposure to the elements in almost any environment.

Economic Benefits:

Stainless steel flanges are low maintenance and do not have an additional coating for outdoor and indoor applications. The expected lifetime of a stainless steel system is for more than 50 years. It helps in reducing the maintenance, replacement, and downtime costs over the life of the installation.

No Blasting, Painting, Or Welding:

When you use flanges, there is no requirement to weld the pipe spools. In the same way, blasting and painting also become unnecessary, unlike other methods and fittings.

Industrial forged flanges are essential components in various piping systems, used to connect pipes, valves, pumps, and other equipment. Here are some common types of industrial forged flanges:

Weld Neck Flanges: Recognized by their long tapered necks, weld neck flanges are welded to the pipe. The tapering neck provides strength and supports the flange, reducing stress concentration at the base of the flange. They are ideal for high-pressure and high-temperature applications.

Slip-On Flanges: These flanges are slipped over the pipe and then welded in place. They are easier to align compared to weld neck flanges and are typically used in lower-pressure applications.

Blind Flanges: Used to seal the end of a piping system or opening, blind flanges do not have a bore and are used to terminate the flow of a pipeline. They are typically used for inspection or cleaning purposes.

Socket Weld Flanges: Designed with a socket into which the pipe fits, these flanges are welded around the outer diameter to create a smooth bore and better fluid flow. They are commonly used in smaller pipe diameters and high-pressure applications.

Threaded Flanges: These are attached to the pipe without welding, making them suitable for low-pressure applications or in places where welding is hazardous. They are screwed onto the pipe, which must be threaded.

Lap Joint Flanges: Consisting of two components, a stub end and a flange, lap joint flanges are used with stub ends and are ideal for systems that require frequent dismantling for inspection and cleaning.

Orifice Flanges: Used in flow metering systems, such as a flow orifice plate, they are typically used in conjunction with orifice meters to measure the flow of liquids and gases.

Ring Type Joint (RTJ) Flanges: These have a groove cut into their face to accept a steel ring gasket, which allows for high pressure and temperature sealing.

• ASTM A182 SS Pipe Flange used in paper mills.
• SA182 Stainless Steel Weld Neck Flange used in expansion joints.
• ASME SA182 SS Slip-On Flange used in bellows.
• ANSI B16.5 Stainless Steel Blind Pipe Flange used in chemical industries.
• ASME SA182 SS Forged Flange used in heating element tubing.
• JIS B2220 SS Long WNRF Flanges used in heat exchangers.
• DIN SS Pipe Flange used in high-temperature mineral processing.
• JIS SS Socket Weld Flange used in spiral welded tubes for burner pipes and flues.

The method of forging typically consists of the following procedures, which are blanking, heating, shaping, and cooling. The method of forging can be classified as free forging or a die forging operation.

Free forging has low productivity and high machining allowance, but the tool is simple and versatile, so it is widely used for forging one-piece and small series forgings with a simple geometry. On the other hand, die forging has the advantages of simple operation, high productivity, mechanization, and automation. Die forgings have high dimensional accuracy, a small machining allowance, and a more reasonable grain structure distribution, which can further improve the service life of flange parts.

Die Forging

Die forging is also known as model forging. Follows the basic steps: blanking, heating, pre forging, final forging, punching and connecting skin, trimming, tempering and shot peening. Common processes include upsetting, drawing, bending, punching and forming.

The widely used die-forging machineries are forging hammer , hot die forging press, flat forging system, and friction press. The forging flange is normally of higher quality, typically by die forging, the crystal structure is good, the strength is high and the price is of course costlier.

Free Forging

Free forging refers to a method of forging where the heated iron/steel is anchored and then formed by hammering, pressing, or other methods. Free forging can flexibly form the shape of each product and is suited for making large components or for diversified small-quantity production. As mentioned before, free forgings productivity is low and the machining allowance is large, but the tool is simple and the versatility is large, so it is widely used for forging a single piece and a small batch of forgings with a simple shape.

Cast Iron Flanges

Casting is the process in which the metal is heated until molten then poured into a mold or vessel to create the desired shape. They are often used in cases that are too large, complicated, or otherwise not suitable for forgings.

Some of the advantages of flanges manufactured in this way include lower costs of production, the ability to make more intricate parts at lower costs, as well as having no true upper limit on size when it comes to your part. There are, however, some drawbacks to cast iron flanges. The most important of these is how susceptible they are to internal defects. Due to this, cast flanges are not suitable for high-pressure applications or applications in which the probability of corrosion is high.

Despite the advancement of casting technology and computer optimization of the casting process and designs, it is still difficult to meet the standards required for petrochemical industry applications.

Forged Steel Flanges

Forging is the application of mechanical and thermal energy to steel billets or ingots to cause material to change its shape while still in solid form. Forgings offer consistency in composition and structure. Due to the nature of the production of forged flanges, the production costs are higher than that of cast flanges.

Though they cannot have the complex shapes that cast flanges can be made in, their internal structure is more compact and therefore seldom have the defects that often affect cast flanges. Forging eliminates defects found in casting such as shrinkage, porosity, cavities, or cold pour issues. Generally, forged flanges are stronger and more reliable than cast flanges because the grain flows of the steel are altered, confirming to the shape of the part.

The tight grain structure of forgings makes the pieces mechanically stronger, and more resistant to general wear and tear than cast flanges. The higher quality, reliability, strength, and durability are why we deal mostly in forged flanges rather than cast flanges.

Here at Decheng, we offer forged flanges from 1/2″ nominal pipe size to 203″ OD in over a dozen different material grades. We value quality and strive to ensure that you are getting the right part for your application at a price and lead time that works for your business.

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