Inconel 625 Flanges

Quick guide to Inconel 625 Flanges

Inconel is a nickel-chromium alloy 625 is used for its high strength, excellent, fabricability (including joining), and out-standing corrosion resistance. Inconel belongs to the so-called ‘super alloys’ group, which includes especially austenitic nickel-chromium-based alloys. Temperatures in use vary from cryogenic to 1800°F (982°C).

Inconel 625 is made or processed from the stiffening effect of nio-biumon and molybdenum, its nickel-chromium matrix; thus precipitation do not require hardening treatments. This blend of elements is also responsible for excellent resistance to a wide variety of unusually harsh corrosive conditions, as well as high-temperature effects such as oxidation and carburization.

What are Inconel 625 Flanges

A flange is a device used to connect pipes or tube, valves, pumps, and other pieces of equipment to develop a piping structure. It also allows for simple washing, inspection, and alteration. Flanges are welded or screwed. Flanged joints are created by bolting two flanges together with a gasket between them to provide a seal.

One of  benefits of Inconel is its potential to be used under severe environments. Such extremes are either high temperatures or heavy pressure. This is because when Inconel is exposed to very high temperatures, it forms a very stable oxide layer, which prevents the metal’s surface from further corrosion.

High temperatures or high pressure are examples of those extremes. This is due to the fact that when Inconel is exposed to very high temperatures, it forms a very durable oxide coat, which protects the metal’s surface from further corrosion.

Inconel flanges have great oxidising and decreasing content of corrosion resistance, making them ideal for a variety of high corrosive applications. It is used in chemical processing applications due to its high resistance to sulphuric acid and hydrochloric acid. Inconel valve flanges are widely found in fuel and water pipelines. It has a longer operating life and is therefore less expensive to maintain.

Inconel 625 flanges are in a variety of configurations, including 

  • Slip on Flange
  • Weld Neck Flanges
  • Flanges Reduction
  • Socket Weld Flange
  • Threaded Flange
  • Blind Flanges
  • Lap Joint Flanges, and more.

Inconel 625 Flanges are the most prominent and durable corrosion-resistant alloy. After being diluted and partly oxidised, it has a very high corrosive resistance. They are limited, and the fastener are only produced in larger diameters.

Benefits of Inconel 625 Flanges

  • Corrosion resistance
  • Mechanical properties at high temperatures is excellent
  • Suitable for sulphuric and hydrochloric acid environments.
  • Outstanding resistance to stress corrosion cracking.

Applications Inconel 625 Flanges

Inconel 625 flanges are used in Chemical industries, Oil and gas factories, gas processing industries, petrochemical industries, food processing industries, sugar industries, power generation industries, and fertiliser industries etc.

Inconel 625 Flanges has a range of applications that has a wide and is widely used for high performances equipment. It is popular to find it in chemical and pressure vessel, pump motor shafts, steam turbine and also in Turbine blades, combustors and seals in oil and gases industries.

When it comes to highly critical uses, 625 Flanges is also one of the key components of nuclear pressurised water reactors.

Inconel 625 Flanges are more durable and robust flanges which are mostly applicable.


super duplex flanges

Benefits and Applications Super Duplex Flanges

Super Duplex is molybdenum (moly)-added austenitic-ferritic iron chromium-nickel alloy. As opposed to traditional austenitic stainless steels, it has good pitting resistance, and has excellent Tensile strength, and is high resistance to stress corrosion cracking at modest temperatures.

Super Duplex Flanges

A flange is an external or internal ridge between two pipes that enables pumps, pipes, valves, and other machinery which is attached to form a piping structure.

Duplex 2507 is a super duplex austenitic stainless steel grade. The 2507 Super Duplex Flange’s specific chemistry or chemical composition contains elements such as 25% chromium, 4% molybdenum, and 7% nickel in its alloy.

Super Duplex Flanges have high thermal conductivity and a low thermal expansion, as well as excellent resistance to chloride stress-related corrosion cracking. The high chromium, molybdenum, and nickel content of the Super Duplex Pipe Flange provides the flanges with improved or enhanced resistance to the crevice, pitting, and general corrosion.


Super Duplex include this type of flanges:

  • Lap Joint Flanges.
  • Socket Welding Flange.
  • Blind Flanges and Spectacle Blind.
  • Welding Neck Flange.
  • Long Welding Neck Flanges.
  • Threaded Flanges.
  • Orifice Flange.
  • Slip-on Flange.


Super Duplex Flange is also resistant to inorganic acids, which is important in the presence of chloride-containing materials. While the Super Duplex Flange can be used in dilute hydrochloric acid, it should not be exposed to concentrated hydrochloric acid. Super Duplex Flanges have increased pitting corrosion tolerance in salty settings, brackish waters, bleaching procedures, and certain food processing applications. Offshore marine requires components that can survive severe and harsh environments and are light in weight. Because of the added Nitrogen, Super Duplex Flanges have an improved microstructure, allowing for the fabrication of small and light-weight flanges that are simple on the wallet.


Where is Super Duplex Flanges applicable?

  • Super Duplex is particularly useful in applications for industries such as offshore, oil and gas as well as in sour wells. Heat exchangers, tubes/ pipes for production and handling.
  • Desalination plants heat exchangers and drains
  • Components which are structural and mechanical
  • FGD applications in the power sector,
  • Pipes that carry chloride-containing solutions,
  • Utility and industrial systems, shafts, fans, rotors, and press rolls will all benefit from the high corrosion fatigue strength.
  • Chemical tanker cargo containers, boats, plumbing, and welding consumables



  • High tenacity
  • Pitting and crevice corrosion resistance is excellent.
  • Resistance to stress corrosion cracking, corrosion fatigue, and degradation 
  • Outstanding chloride stress-corrosion resistance cracking.
  • Sulfide stress corrosion resistance is fine.
  • Austenitic steel is less thermal expansion and has better conductivity to heat.
  • Workability and weldability are outstanding.
  • High Absorption of an electricity


Hastelloy C276 is a super alloy with a perfect composition of nickel, molybdenum, and chromium. Also, there is an additional trace of tungsten, which offers an excellent form of corrosion-resistant. Also, it makes Hastelloy C276 suitable to work smoothly in extreme environments. These components also help in resisting crevice corrosion and pitting in reducing the environment. Chromium is useful to convey resistance to work in oxidizing conditions. HASTELLOY C276 is helpful in forming flanges, tubes, bars, machining, and elbow designs well. Additionally, the material works well for the preparation of plates, tubes, wires, and fittings.


HASTELLOY C276 TUBE FITTINGS are available in premium quality that are reliable for various applications. Specifically, these tube fittings are useful in pollution control units, chemical processing plants, paper and pulp mills, and several other areas. HASTELLOY C276 TUBE FITTINGS works well to offer excellent corrosion resistance conditions. The material grade has higher molybdenum and nickel content, which offers additional resistance against crevice and pitting. Also, these HASTELLOY C276 TUBE FITTINGS works well in reducing and oxidizing. These products are capable of producing grain boundary precipitation. And hence, these tube fittings are suitable for various chemical processing applications and welding procedures. HASTELLOY C276 TUBE FITTINGS are useful in bleach plans and digesters of the paper industry. Additionally, mixers, filters, evaporators, and heat exchangers useful in sulfuric acid conditions require HASTELLOY C276 TUBE FITTINGS. Sulfuric acid requires HASTELLOY C276 TUBE FITTINGS.

Features and characteristics of HASTELLOY C276 TUBE FITTINGS

HASTELLOY C276 TUBE FITTINGS are the most versatile product that has strong corrosion resistance ability. The material exhibits excellent resistance to work in various chemical processing environments, such as solutions containing cupric chlorides and ferrites. Additionally, HASTELLOY C276 TUBE FITTINGS can offer the ability to serve in environments having hot contaminated organic and inorganic compounds, traces of chlorine, formic, acetic acids, etc. Also, these fittings can resist seawater, brine, hypochlorite, and chlorine dioxide solutions as well.

HASTELLOY C276 TUBE FITTINGS has excellent corrosion resistance in reducing solutions. Also, they show brilliant resistance against robust oxidizing solutions containing cupric and ferric chlorides. HASTELLOY C276 TUBE FITTINGS has a lower carbon content that decreases precipitation during the welding procedures.

Duplex Flanges

Material used for Duplex Flanges and its uses

Duplex steel, which is both Austenitic and Ferritic, is widely used in applications has high corrosion resistance and strength. Duplex is usually composed of 22 percent chromium and 5 percent nickel.

Duplex steel goes under precipitation at temperatures above 300°C, the brittle micro-constituents and at below -50°C temperatures the micro-constituents goes under the ductile-to-brittle phase; because of this Duplex stainless steel is not suitable for use at these temperatures.

What is a Duplex Flange?

Duplex steel Flanges are extremely corrosion resistant, work hardenable alloys. The austenite and ferrite phases has mixture of microstructures. Duplex Flanges are higher resistance to corrosion As a result, duplex steels Flanges display properties characteristic of austenitic as well as ferritic stainless steels

Heat treatment cannot be used to harden duplex steel flanges. It hardens when processed Duplex flanges cools rapidly after heating to about 1100°C may be used for solvent treatment or annealing.

Types and Uses of Duplex Flanges

  • Duplex Steel Forged Flanges are found in size from 1/8 inch – 24 inches. Flanges have various pressure group depending on their different dimensions. 
  • Duplex Weld neck flanges, Blind flange, Orifice Flanges, Lap Joint Flanges, and Slip on Flanges are a few types of Flanges. All these types of flanges are used in different way as per there applications.
  • Slip on flanges are used for seamless pipes to maintain connection points exactly. The flanges can also be made as screwed, plate, forged, threaded flanges.
  • Duplex Steel Threaded Flange are used in connecting with male threaded pipe ends. Theses flanges usually have a female threaded end. There are also different varieties of faces, such as flat faces, raised faces, and ring type jointed faces. The various faces or flange types are used according to the application.
  • Duplex Steel Socket weld Flanges has an ability to hold the pipes during and after welding. They provide a connecting surface for welding and bolt holes. Duplex flanges are used in a variety of applications ranging from seawater to electricity generation.


Few other Applications of Duplex Flanges

  • Pollution control equipment
  • Oil and Gas Pipeline
  • Chemical Industry
  • Plumbing
  • Water Supply Systems
  • Power Plant
  • Paper & Pulp Industry
  • Industrial Flanges uses in Fabrication Industry
  • Gas exploration and Offshore Drilling Rigs
  • Food Processing Industry
  • Marine environments
  • Structural Pipe
What you need to know about SMO 254 TUBE FITTINGS

What you need to know about SMO 254 TUBE FITTINGS

Insights to SMO 254

SMO 254 is an austenitic stainless steel alloy that has broad applicability in several sectors. Mainly, it is designed to match the requirement of seawater and other chloride-containing solutions. SMO 254 is a material that holds several features and characteristics and hence gained massive popularity in the market. The material consists of carbon, silicon, phosphorous, silicon, chromium, nickel, molybdenum, nitrogen and copper. 

Properties of SMO 254 

SMO 254 is austenitic stainless steel shows good resistance against crevice and pitting corrosion. Additionally, they can resist general corrosion and stress corrosion and cracking events. The high material strength of SMO 254 makes them better compared to other conventional austenitic stainless steels. Additionally, the material grade offers good welding capacity. 

Applicability of SMO 254 grade 

SMO 254 is suitable for various applications that include seawater colling water pipes, ballast water systems, firefighting systems, etc. Hydraulic instrumentation and tubing require SMO 254 products. SMO 254 material works well in bleaching plants and gas cleaning systems. Tanks and piping systems are carrying chemical uses SMO 254. 

Get to know about Tube Fitting

SMO 254 Tube fittings offer leakage-free connections and suitable for power and instrumentation applications. Besides, these are the products available in high-quality standards and varied sizes and configurations. These tube fittings are useful in various instrumentations, process control units, and chemical plants. Also, SMO 254 tube fittings work well in power generation plants, pulp industry and petroleum plants. Additionally, SMO 254 Tube fittings are useful in special applications requiring high pressure carrying capacity. 

Features of SMO 254 Tube fittings 

These are the products that work well in halide solutions and the presence of chloride and bromide ions. The SMO 254 grade shows the effect of local corrosion due to pitting, crevice, and stress. SMO 254 is a material with a low carbon element. Such low carbon holds less risk of carbide precipitation during heat application during welding activity. 

Installation of SMO 254 Tube fittings 

These SMO 254 tube fittings are easy to install and do not require additional torque. During initial installation, the gas inspection gauge ensures sufficient pull-up.

Useful Tips for Welding INCONEL 625 TUBE FITTINGS

Useful Tips for Welding INCONEL 625 TUBE FITTINGS

Inconel is nickel-based material shows a high nickel-chromium content. These components are known for their extreme heat tolerance capacity. Here, Inconel 625 is a material also known as UNS N06625 alloy or Inconel tubing material. INCONEL 625 TUBE FITTINGS are the product with a high degree of tensile strength and ability to work at high-temperature ranges where other metals burn or melts. Here, these parts are heated at their melting point to fuse them. INCONEL 625 TUBE FITTINGS are famous for temperature resistance ability, and hence welding of Inconel material is slightly tricky or impossible. 

Things to remember

Following are the various things need to consider while performing welding of INCONEL 625 TUBE FITTINGS:

1. Weld Inconel 625 using Tungsten Inert Gas (TIG)

Inconel 625 grade has the too high melting point, and it becomes difficult to join two different Inconel workpieces if they are large. The joining of Inconel 625 grade through the welding process. A welding process combines Inconel pieces at high temperatures using a filler material. It is the best method to perform welding of Inconel alloys. Also, several experienced welding professionals suggest the TIG welding procedure. It is the process that uses a filler material. Further, the electrical arc welding process does not require a filler material. Hence, it is most suggested for Inconel welding due to its ability to combine two alloy pieces without enabling its cracking.

2. Use Inconel 625 for filler material

For obtaining the best results from Inconel welding, it is essential to use Inconel 625 filler metal.  Here, the filler metal is one of the most straightforward Inconel alloys suitable for welding two Inconel portions. More comfortable melting point is the reason for choosing Inconel 625 in place of several other elements. When the two joining components differ from one another, then it can cause a problem. There might be a chance of bimetallic corrosion or thermal expansion after exposing them to high temperature in such cases. For welding of INCONEL 625 TUBE FITTING, alloy one can use Inconel welding filler material.

3. Use an automated machine to perform welding of Inconel 625

For the accomplishment of welding manually, an inconsistent process is best suited. Here, the initial few welds might be inadequate as the welder reaches the groove. But the next few welds are the best, and then welder needs to produce rest of the welds with the same motion. Here, he or she may suffer fatigue due to repeated movements over and over. The same thing may happen with the person holding a boiling welding device that is partially melting a super heat-resistant metal, and then it may invite disaster.


Duplex Tube Fittings V/S Super Duplex Tube Fittings

Duplex is a material that offers high resistance against stress corrosion and cracking. Duplex tube fittings are suitable to work in the chloride-containing environment. Also, super duplex grade offers the ability to work in the presence of hydrogen sulfide. The duplex grade has high mechanical strength and capacity to work at high-temperature range. Duplex tube fittings show good fatigue and mechanical strength as it has physical properties as well. Here, duplex alloy offers the good working ability, weldability and formability features. The material grades are designed and developed for heavy load engineering operations due to its strength. 

For the production of the tube, fittings require high-end manufacturing procedures and high-quality raw materials. Tube fittings are available in precise dimensions and tolerance capacity. The stainless steel is processed for quenching, tempering, and other procedures. Also, tube fittings go through various procedures, including finishing, matte finish, sand brushing, etc. 

Duplex tube fittings 

Here, in Duplex tube fittings, duplex type of stainless steel is used, which has the mixture of ferrite and austenite microstructure. Duplex tube fittings consist of 50-50 concentration of elements. The duplex grade is commercially available material contains a 60/40 ratio. These tube fittings show improved strength due to austenitic stainless steel grade. Besides, duplex tube fittings show enhanced resistance to corrosion, pitting, crevice and stress conditions. Duplex tube fittings show the presence of 19 to 20% chromium, 5 % molybdenum and a lower concentration of nickel. These elements are present in less amount compared to austenitic stainless steel. The duplex tube fittings are a product with double mechanical properties and resistance to cracking. Also, these tube fittings are malleable and brittleness at 50-degree C. 

Super duplex tube fittings

Stainless steel 2507 is a material grade that contains 22% chromium, 5% nickel, 25% chromium, and 7% nickel. The material grade is known as the super duplex due to its high resistance capacity. Besides, super duplex tube fittings show better stress and corrosion due to its mechanical properties. Super duplex tube fittings consist of elements like iron, chromium, nickel along with molybdenum. These tube fittings of super duplex show good resistance to stress and corrosion. Besides, it can hoist in conventional grades. Super duplex tube fittings are ideal for offshore and onshore applications due to high resistance.