Incoloy 800 / 800H / 800HT Heat Exchanger Tube

Incoloy 800 / 800H / 800HT Heat Exchanger Tube Manufacturer, Supplier in India

Incoloy 800, Incoloy 800H, and Incoloy 800HT heat exchanger tubes possess several key properties and characteristics that make them suitable for various high-temperature applications. These alloys exhibit excellent oxidation, carburization, and sulfidation resistance, making them highly resistant to corrosive environments encountered in heat exchanger applications. Additionally, their high strength and good creep-rupture properties enable them to withstand elevated temperatures for prolonged periods without deformation or failure.

Incoloy 800, 800H, and 800HT also display exceptional thermal stability, allowing them to maintain their mechanical properties under extreme heat conditions. Their low thermal expansion coefficient minimizes the risk of thermal stress and distortion in heat exchangers subjected to rapid temperature changes. Moreover, these alloys exhibit good weldability and formability, facilitating their fabrication into complex heat exchanger tube geometries.

How does the corrosion resistance of Incoloy 800 / 800H / 800HT heat exchanger tubes compare to other materials?

Incoloy 800 heat exchanger tubes exhibit impressive corrosion resistance, and their performance can be compared to other materials commonly used in similar applications. Compared to stainless steels, such as the popular 300 series (e.g., 304 and 316), Incoloy 800 demonstrates superior resistance to oxidation, carburization, and sulfidation at high temperatures. That is primarily due to its higher nickel content and the addition of chromium, which forms a protective oxide layer on the surface, effectively preventing a corrosive attack.

Regarding corrosion resistance, Incoloy 800H demonstrates similar performance to Incoloy 800. The "H" designation in Incoloy 800H stands for "high carbon," which provides improved elevated-temperature properties and enhanced resistance to intergranular corrosion. That makes Incoloy 800H a preferred choice in applications where exposure to sensitizing conditions, such as prolonged exposure to high temperatures or certain chemical environments, is anticipated.

Compared to other nickel-based alloys, Incoloy 800HT exhibits similar or slightly lower corrosion resistance, depending on the specific environment. While it may have slightly lower resistance to certain corrosive agents in highly oxidizing or reducing acids than alloys like Hastelloy C-276 or Alloy 20, it still maintains excellent resistance in many corrosive environments.

Drawing/ Floating Process

Pulling a metal bar, rod, or wire through the entirety of a die to change its finish, shape, size, and/or mechanical qualities is known as floating or drawing. The tube's outer, inner, and wall thicknesses are all reduced via the tube drawing procedure. Stainless steel tubes benefit from maintaining the integrity of their surface.

Continuous Heat Exchanger Tube Mills

The production of Heat Exchanger tubes has been transformed by continuous tube mills. These mills do away with the necessity for forging welding or filler metal, in contrast to conventional procedures. With the use of this technology, Heat Exchanger pipes and tubes may be produced continuously, increasing productivity while lowering costs and improving efficiency.

Continuous Casting

A notable advancement in the production of Heat Exchanger tubes is continuous casting. The metal is solidified into a continuous billet through the continuous pouring of molten metal into a water-cooled mould. Better uniformity and enhanced mechanical qualities are guaranteed by this continuous casting technique for the tubes.

Annealing

Metal is heated above the point of re-crystallization and cooled to room temperature during the annealing process. The molecular bonds in metal tighten when it is shaped, making it rigid. The metal is put through an annealing process to regain its ductility.

Sinking Process

Tube sinking is a drawing technique that reduces the diameter of tubes. In this drawing technique, a tube is run through a die without the need of a mandrel. Good inner surface quality is not ensured when using a mandrel. The die angel determines the integrity of the outer surface. The die being used produces a uniform surface. A tube can be significantly smaller than it was originally. When cost is a factor, tube sinking is ideal.

Inspection and Testing

Before sending our items to our consumers, we conduct inspection procedures to verify their integrity.