Stainless Steel 321 Heat Exchanger Tube

What are the main properties and characteristics of stainless steel 321 / 321H heat exchanger tubes?
Stainless steel 321 / 321H heat exchanger tubes possess various properties and characteristics that make them highly suitable for heat transfer applications. These tubes are primarily composed of iron, with significant additions of chromium, nickel, and titanium. Including titanium provides enhanced resistance to intergranular corrosion, making them highly resistant to sensitization during welding or high-temperature exposure.

One of the key features of stainless steel 321 / 321H heat exchanger tubes is their exceptional high-temperature strength. They exhibit excellent creep and stress rupture properties, enabling them to withstand prolonged exposure to elevated temperatures without compromising structural integrity. This characteristic makes them well-suited for applications involving high-temperature environments, such as power generation, petrochemical, and refinery industries.

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What are the advantages of using stainless steel 321 / 321H heat exchanger tubes over other materials?
Stainless steel 321 heat exchanger tubes offer several advantages over other materials, making them a preferred choice in various applications. One notable advantage is their exceptional corrosion resistance. Stainless steel 321 exhibits excellent resistance to various corrosive environments, including organic acids, oxidizing agents, and moderate to high chloride concentrations. This corrosion resistance ensures the longevity and reliability of heat exchanger systems, reducing maintenance requirements and minimizing the risk of system failure.

Stainless steel 321H heat exchanger tubes offer several advantages over other materials, making them a preferred choice in various applications. One significant advantage is their exceptional high-temperature strength and oxidation resistance. Stainless steel 321H can withstand elevated temperatures up to 900°C (1652°F) without significant mechanical property degradation, making it highly suitable for heat exchanger applications in demanding operating conditions.

Another advantage of stainless steel 321H heat exchanger tubes is their excellent corrosion resistance. They exhibit remarkable resistance to various corrosive environments, including organic acids, oxidizing agents, and moderate to high chloride concentrations.

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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.

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