Alloy 800 - Tube Heat Exchanger

Heat exchangers are a vital part of many industrial and HVAC systems, responsible for transferring heat from one fluid to another.?

One popular type of heat exchanger is the pipe heat exchanger, which utilizes a series of tubes to transfer heat. The selection of the right material for the tubes is crucial, as the tubes must be able to withstand high temperature and pressure conditions of the fluids flowing through them.

One of the most suitable materials for use in pipe heat exchangers is heat-resistant stainless steel and nickel alloys. This type of stainless steel, such as INCOLOY? or Hastelloy?, is able to withstand high temperatures and corrosive fluids without losing its strength or durability.?

In specific, material 1.4876 is a heat-resistant steel alloy that is widely used in pipe heat exchangers. It is an iron-chromium-nickel alloy that contains about 19-23% chromium and about 30-35% nickel.

It can be necessary in some cases to reduce aluminium and titanium content and restrict those two up to a max. of 0,4-0,7%.

In combination with a special grain size according to ASTM, this case shows up quite often when it comes to Alloy 800H.??

The use of heat-resistant stainless steel, like 1.4876, in pipe heat exchangers offers several benefits. One of the most significant benefits is the increased overall efficiency of the heat exchanger. The material's high resistance to corrosion and fouling reduces the potential for these issues to occur, which can prolong the lifespan of the heat exchanger and reduce maintenance costs.

Additionally, heat-resistant stainless steel, like 1.4876, can handle higher temperature fluids and higher pressure conditions, allowing for more compact and efficient heat exchangers. This is particularly useful in high-temperature industrial processes, such as power generation or petrochemical production where higher temperature and pressure conditions are prevalent.

Material 1.4876 also has excellent thermal conductivity properties, which makes it ideal for heat exchanger applications. The material's thermal conductivity is about 15% higher than that of other stainless steel alloys, which means that it is able to transfer heat more efficiently. This results in a more compact and efficient heat exchanger design.

Furthermore, this material grade, 1.4876 has a high resistance to thermal fatigue, which makes it a suitable choice for heat exchanger applications that are subject to cyclic temperature changes. The material's high resistance to thermal fatigue ensures that the heat exchanger maintains its structural integrity even after prolonged exposure to cyclic temperature changes.

When it comes to the standardization of 1.4876, it is manufactured according to different EN and ASTM standards. The EN standard, which is used in Europe, is EN 10216-5, SEW 470, VDTüV sheet 412 and 434 while the ASTM standard, used in the United States, is mainly ASTM B 407, ASTM B 163, ASTM B 514, ASME SB 515 and NACE MR0175. All this standards specify the chemical and mechanical properties of the material, as well as the manufacturing and testing requirements.

Alloy 800 / 1.4876 (UNS N08800), 800H / 1.4958 (UNS N08810) and 800HT / 1.4959 (UNS N08811) are also part of the heat resistant alloys family, they are nickel-chromium alloys with good strength and excellent resistance to oxidation and carburization in high-temperature environments. The difference between them is their chemical composition and the operating temperature range.

Alloy 800 is typically used for heat exchangers in petrochemical and chemical processing, as well as in furnace components. Alloy 800H is mainly used for heat exchangers and other high-temperature applications, and alloy 800HT is used for applications that require even higher temperature resistance, such as in the heat treatment industry.

In conclusion, the use of heat-resistant stainless steel, such as material 1.4876, in pipe heat exchangers provides several advantages. The material's high resistance to corrosion and fouling, ability to handle high temperature and pressure conditions, excellent thermal conductivity properties, and resistance to thermal fatigue make it an ideal choice for heat exchanger applications.?

If you need further information or advice on this material choice and grade for your next projects, do not hesitate to contact our team at Schenk-Stahl, to help you find the right appropriate material and tube size for you.

Contact details can be found on our website at:

https://www.schenk-stahl.de