Key Questions to Ask When Ordering alloy 825 pipe

We explore INCOLOY alloy 825 and how it can be worked and processed to give maximum performance in difficult conditions

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INCOLOY alloy 825 is a material that has been designed to last, even under extreme operating conditions. This powerful nickel alloy is considered the forerunner of alloys containing molybdenum, the inclusion of which lends the material additional strength.

Due to its hardiness, it is widely used in a number of volatile environments, including in chemical processing, pollution control equipment and the oil and gas industry. It is noted for its excellent corrosion resistance, which is part of the reason it is adopted in so many different industries.

The other reason that this material is such a popular choice among design engineers is that it is worked in such a way that it is stabilised for maximum performance. Through the years the process has been optimised and perfected.

Treatment and processing

While INCOLOY alloy 825 was introduced to the market over 50 years ago, questions still abound about the proper methods for fabricating, welding and heat treating the alloy.

Despite the fact that the alloy is a conventional iron-nickel-chromium-molybdenum alloy, it requires special attention to detail during processing to ensure that the product develops the optimum metallurgical structure, mechanical properties and corrosion resistance for the given application.

For optimum properties, the alloy should enter service in a stabilised condition. Proper mechanical processing and heat treatment are required to produce the microstructure required for optimum corrosion resistance.

Nickel-chromium-molybdenum alloys such as INCOLOY alloy 825 are often solution-annealed at a high temperature prior to service. However, stabilised alloys offer optimum corrosion resistance after annealing at a lower temperature. This process is commonly referred to as &#;stabilisation anneal&#;. This is the standard condition of supply for INCOLOY alloy 825 products and is the key to successful fabrication of the alloy. However carefully the material is formed and welded, if the material has not been correctly stabilised it will not give maximum performance.

Choosing the right annealing temperature for the intended end use is key here. It helps to maintain the high corrosion resistance that is required, for example, in the chemical processing industry. During the final stages of working and annealing, the temperature should be limited to -°F (930-980°C). The optimum temperature for stablisiation is considered to be °F (940°C).

The stabilising anneal heat treatment used for the alloy results in the optimum performance when unstabilised alloy is exposed to intergranular grain boundary attack.

Mechanical properties

The point of all this processing and optimising in order to stabilise the alloy is to retain its impressive mechanical properties. These are what make it such an attractive material to use, especially considering that it can operate in temperatures from cryogenic to moderately high. There are limitations, of course, to consider to ensure optimum performance. For example, when exposed to temperatures of more than °F (540°C), the alloy may undergo microstructural change (phase formation) that significantly impacts the ductility and impact strength. As such, this alloy is not usually selected as material of choice for service environments where temperatures will exceed this and where creep-rupture properties are a key factor in the design spec. However, given the right operating conditions to suit this material, INCOLOY alloy 825 has a lot to offer. It can be strengthened quite substantially by cold working. The ultimate tensile strength of the material has been recorded as 104,500 psi, and it exhibits good impact strength at room temperature while also retaining its strength in cryogenic conditions.

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Industry applications

A stabilised and corrosion-resistant alloy such as INCOLOY alloy 825 lends itself to many end uses where its mechanical properties are highly desired.

In particular, in the chemical processing industry, material selection can be especially tricky. An alloy that is stabilised for maximum performance is essential to ensure that it can hold up to the intense pressure, corrosive environments and high temperatures that are commonplace in such difficult service conditions.

The chemical composition of the alloy is what makes it perfect for use in the processing industry. INCOLOY alloy 825 is stabilised by the carbon content being limited to 0.05% max. The alloy is further stabilised by its content of 0.6 to 1.2% titanium. These elements, plus the major elements of nickel, iron, copper and molybdenum, give the material very good corrosion resistance to many corrosive chemicals used routinely in industry. This includes sulfuric and phosphoric acids, and both oxidising and reducing substances.

To find out more about INCOLOY alloy 825 and whether it&#;s right for your next project, please Contact Us and speak to a member of our experienced Sales team.

Modern alloys have been developed over time using the latest technological knowledge to give them the properties needed for use in a range of essential industries. We look at some of the best in more detail

Alloys have been around for a long time, but as our knowledge of their properties and potential has improved over time, so too have the alloys themselves. Superior alloys are a precise blend of elements with careful treatment to ensure they can perform under some of the most extreme industrial conditions. The alloys that Corrotherm supplies are technically superior in many ways; we highlight four of the most advanced materials here.

INCONEL 625

This alloy is one of the most technically advanced materials that Corrotherm supplies, and it is a firm favourite of both our team members, as well as our customers. And for good reason&#; INCONEL alloy 625 has the most covetable blend of key properties, offering high strength, excellent fabricability and outstanding corrosion resistance. This means that it can lend itself to so many different industrial applications, including but not limited to the aerospace, automobile, oil extraction, oil refining, marine, waste treatment, pulp and paper, and power industries. You can read more about this alloy in our detailed product focus.

INCONEL C-276

INCONEL alloy C-276 has been a popular alloy for decades and its use is not waning yet. It is known for its outstanding corrosion resistance to both acid and alkali media, making it exceptionally useful in very inhospitable environments. Not many alloys have properties like INCONEL alloy C-276, which is why its applications include chemical, pharmaceutical and food processing, pollution control, pulp and paper production, and the recovery of sour natural gas &#; all industries where materials have to hold up under extreme conditions. Find out more about this technical alloy, including its composition and properties in this blog.

INCOLOY 800H and 800HT

The INCOLOY 800 series of alloys has been specifically developed over time to meet the needs of the industries that it is utilised in as technical knowledge of alloy production has improved. The original INCOLOY alloy 800 was originally introduced in the Fifties to meet the need for a material that could be used in high-temperature and corrosive environments with a relatively low nickel content and low carbon element. Since then, it has been refined into two newer versions. INCOLOY alloy 800H has a more precise carbon content to offer higher creep and rupture properties for use in petrochemical processing and power generation. INCOLOY alloy 800HT is even more precise in its combination of elements and its treatment for very specific operating conditions. Find out more in our product focus looking at both of these advanced alloys.

INCOLOY 825

Many modern alloys now make use of molybdenum within their makeup, which has a high melting point and therefore helps materials to stand up in high-temperature environments. INCOLOY alloy 825 offers both high strength and resistance to both reducing and oxidising media. It is considered the forerunner of molybdenum alloys, but it is still widely used, particularly in chemical processing for heat exchangers. It also plays a part in the oil and gas industry, and pollution control. While it&#;s known for its performance in high temperatures, it can also be used in cryogenic conditions, making it a versatile material. You can find out more in our product focus.

Visit the Grades page on our website to see more of the technical alloys that Corrotherm can supply, or Contact the Sales team for more information.

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