2507 stainless steel pipe (also known as Super Duplex 2507) is a super duplex stainless steel with very high strength and excellent corrosion resistance. It combines the duplex structure of austenite and ferrite, and adds a higher proportion of chromium (Cr), nickel (Ni), molybdenum (Mo) and nitrogen (N) to its composition, so it has very superior mechanical properties and corrosion resistance.

In particular, the Super Duplex 2507 Seamless Tubing is very resilient to chloride stress corrosion cracking, which is a cause for failure in austenitic stainless steel alloys like 304 or even alloy 316. An important characteristic of the 2507 super duplex stainless steel tubes is that they have a low coefficient of thermal expansion. This property is vital to tubes and pipes mainly in industries that use elevated temperature, or those industries where the Alloy 2507 super duplex tubing is involved in exothermic reactions that give off very high levels of thermal energy.

What is 2507 stainless steel grade?

2507 is a super duplex stainless steel grade with high strength and corrosion resistance. It’s used in applications like chemical processing, petrochemicals, and seawater equipment. 

Composition 

Duplex 2507 (UNS S32750) is a super duplex stainless steel with 25% chromium, 4% molybdenum, and 7% nickel designed for demanding applications which require exceptional strength and corrosion resistance, such as chemical process, petrochemical, and seawater equipment.

Properties 

High resistance to chloride stress corrosion cracking

High thermal conductivity

Low coefficient of thermal expansion

High resistance to pitting, crevice, and general corrosion

High yield strength

Good weldability and formability

Enhanced durability and toughness

High-energy absorption

ASTM A790 UNS S32750 Seamless Pipe Specification

Corrosion Resistance of Duplex stainless steel

Duplex stainless steel are extremely corrosion resistant. They have high resistance to intergranular corrosion. Even in chloride and sulphide environments, Duplex stainless steel exhibit very high resistance to stress corrosion cracking.

The super duplex grades are even more resistant to corrosion.

Superior Mechanical Properties:

High hardness: This is especially beneficial for applications requiring material resistance to wear and tear.

Good fatigue resistance: Its combination of high strength and ductility ensures that 2507 stainless steel can handle dynamic loading and vibration without compromising its integrity.

Excellent Weldability:

Although welding of 2507 requires careful control of heat input, proper filler materials, and possibly post-weld heat treatment (PWHT), it is still relatively easy to weld compared to other high-alloy materials.

Good High-Temperature Performance:

While not as heat-resistant as certain austenitic stainless steels or superalloys, 2507 performs well up to 600°C (1112°F). It maintains high strength and corrosion resistance in high-temperature environments, such as chemical reactors or heat exchangers.

Super Duplex 2507 Seamless Pipe Chemical Composition

ASTM A790 UNS S32750 Pipe Mechanical Properties

Physical Properties of UNS S32750 Super Duplex Stainless Steel Pipes
 

What is equivalent to 2507 stainless steel?

What is the difference between 2507 and 316?

The difference between 2507 (Super Duplex Stainless Steel) and 316 (austenitic stainless steel) primarily comes down to their corrosion resistance, weldability, and cost. Here’s a detailed comparison:

Corrosion Resistance

2507 Stainless Steel:

Superb resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC), especially in chloride-rich environments like seawater. It has a higher resistance to chloride-induced corrosion than 316, making it ideal for extremely corrosive conditions.

316 Stainless Steel:

Good corrosion resistance, especially in chloride-rich environments such as seawater. Performs well in mild to moderate corrosive environments, such as food processing, pharmaceutical, and marine applications.

Weldability

2507 Stainless Steel:

 Post-weld heat treatment (PWHT) is often required to ensure the material retains its duplex structure and properties. Requires special welding rods or filler materials to avoid issues like weld metal segregation or degradation of corrosion resistance.

316 Stainless Steel:

Easier to weld compared to 2507, and is commonly welded with standard welding techniques.

Cost

2507 Stainless Steel:

Generally more expensive due to its higher alloy content, more complex manufacturing process, and superior performance in harsh environments.

316 Stainless Steel:

Less expensive than 2507, making it a more cost-effective option for many general-purpose applications.

Duplex Stainless Steel Seamless Pipes Dimension

What is the difference between 2205 and 2507 stainless steel?

Corrosion Resistance:

2205:

Excellent resistance to general corrosion, pitting, and crevice corrosion in a wide range of environments, including marine, chemical, and food processing environments.

It performs well in environments with chloride ions but has lower resistance to highly corrosive environments like acid-rich or seawater settings compared to 2507.

2507:

Superior resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC), especially in chloride-rich environments (e.g., seawater).

It excels in extreme environments, including offshore and marine applications, where exposure to highly corrosive environments is a concern.

2507 is often considered the go-to choice for more aggressive applications where higher corrosion resistance is needed, such as deep-sea oil drilling or desalination plants.

Weldability:

2205:

It has good weldability, but care must be taken during welding to avoid excessive heat input and to maintain the duplex structure.

Preheating and post-weld heat treatment (PWHT) are usually not required for 2205.

2507:

2507 has more stringent welding requirements due to its higher alloy content and susceptibility to issues like embrittlement if not welded properly.

Specialized welding electrodes and procedures are required, and post-weld heat treatment (PWHT) is generally recommended to maintain the mechanical and corrosion resistance properties.

Applications:

2205:

Common uses include:

Chemical processing

Marine environments

Food processing

Storage tanks, piping, and pressure vessels.

2507:

Common uses include:

Offshore oil and gas platforms

Desalination plants

Chemical processing equipment

Heat exchangers in marine environments

High-pressure applications

ASTM A790 SAF 2507 Stainless Steel pipe Characteristics

● Thermal expansion Low rate

● For applications up to 600° F Suggested

● Great workability and weldability

● Great general corrosion resistance

● Given by austenitic and ferritic structure Combination of properties

● High Strength

● To crevice corrosion and chloride pitting Superior resistance

● To chloride stress corrosion cracking High resistance

Test

Hardness Test
Flattening Test
Pitting Resistance Test
Chemical Analysis – Spectro Analysis
Micro and Macro Test
Flaring Test Intergranular Corrosion (IGC) Test
Mechanical Testing Such as Tensile of Area
Positive Material Identification (PMI Testing)

You can get an offer for products in below material forms:

-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)

-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )

-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)

-Round bar , Billet (ASTM A276, ASTM A479)

– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)

-Bolting, Nuts（ASTM A193, A194, A320）

2507 Stainless Steel Pipe Exported Countries

We Export 2507 Stainless Steel Pipe to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan,  Europe, Africa, Asia, North America, South America, Middle East.etc

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UNS S31803 duplex stainless steel pipe has a unique duplex structure. It has composed of two phases of austenite and ferrite. This duplex structure gives the steel pipe excellent comprehensive performance. Compared with traditional austenitic stainless steel, it has higher strength. UNS S31803 steel pipe plays an Duplex stainless steel pipe can withstand higher internal pressure without deformation or rupture.

UNS S31803 duplex stainless steel pipe can be used to transport acidic and alkaline solutions, etc. Due to its corrosion resistance, it can maintain good appearance and structural integrity under marine climate conditions.

Specification of UNS S31803 Duplex Stainless Steel Pipes

The Difference Between UNS S31803 and S32205

Chemical Composition

The chromium content of S31803 is roughly between 21 and 23%. The chromium content of S32205 duplex stainless steel pipe is about 22 to 23%. The relatively higher chromium content of S2205 helps improve its corrosion resistance in more severe environments.

The molybdenum content of S31803 is around 2.5 – 3.5%, while the molybdenum content of S2205 is different. The difference in molybdenum content will affect the material’s resistance to pitting and crevice corrosion. In addition, other trace elements and their proportions in the two alloys will also cause differences in performance.

Mechanical Properties

As duplex stainless steels evolved, their initial specification was captured as UNS S31803. However, many leading manufacturers have been producing this grade to the upper end of the permissible specification. This reflects their desire to maximize the corrosion performance of the alloy, aided by the development of the AOD steelmaking process, which allows for tighter control of composition. In addition, it also allows for the level of nitrogen additions to be influenced, rather than just being present as a background element.

As a result, the highest performing duplex grades seek to maximize the levels of chromium (Cr), molybdenum (Mo), and nitrogen (N). Based on the formula PREN = %Cr + 3.3 %Mo + 16 % N, the difference between a duplex alloy that meets the bottom of the specification and one that reaches the top of the specification can be several pips.

In order to differentiate duplex stainless steels produced at the high end of the composition range, a further specification was introduced, UNS S32205. Duplex stainless steels manufactured under the S32205 heading will fully comply with the S31803 heading, while the reverse is not true. Therefore, the S32205 can be dual-certified as an S31803.

Application of UNS S31803 Duplex Stainless Steel Pipe

Oil and gas industry

UNS S31803 duplex stainless steel pipe is widely used in the extraction, transportation and processing of oil and gas. On offshore oil platforms, pipes are used to transport crude oil, natural gas and various chemical additives. In long-distance oil and gas pipelines on land, its high strength and corrosion resistance can ensure the safe operation of pipelines under complex geological and environmental conditions.

Chemical industry

The chemical production process involves the transportation of various corrosive media, and UNS S32205 steel pipes are an ideal choice. Whether it is acidic, alkaline or salt-containing media, it can do the job.

Building and infrastructure fields

In the field of construction, UNS S31803 duplex stainless steel pipe can be used for water supply and drainage pipes in building structures, especially in some buildings with high requirements for corrosion resistance, buildings near sewage treatment plants, etc. In terms of infrastructure, such as underground comprehensive pipe corridors in cities, pipes used to transport various media, their good mechanical properties and corrosion resistance can meet the requirements of long-term use.

Importance of Weighing Steel Pipes

In the production and sales of steel pipes, weighing is an important means to ensure quality. For manufacturers, accurate weighing can accurately control the weight of steel pipes, thereby reflecting whether the wall thickness, length and other dimensions of the steel pipes meet the standards. In the purchase and sale of steel pipes, weighing is a key step in determining the quantity of goods. Whether it is domestic or international trade, steel pipe transactions based on weight are very common. Accurate weighing results can ensure fair transactions between buyers and sellers.

When the number of UNS S31803 duplex stainless steel pipe is large, they are usually weighed in bundles or batches. First, the whole bundle or batch of steel pipes is hoisted onto the scale, and the weight is also recorded after the reading stabilizes. However, in this case, the weight of the bundling materials needs to be taken into account. If the bundling materials are heavy, the weight of the bundling materials needs to be weighed separately and subtracted from the total weight to obtain the accurate net weight of the steel pipes.

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