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Stainless Steel 321H Seamless U Tubes

Stainless Steel 321H Seamless U Tubes are specialized tubes made from an alloy of stainless steel, primarily containing chromium and nickel with the addition of titanium. These tubes are renowned for their exceptional properties, making them highly sought after in various industries.

Chemical Composition of Stainless Steel 321H Seamless U Tubes

The table offers crucial insights into the chemical amalgamation of these tubes.

GRADECMnSiPSCrNiNTi
SS 3210.08 max2 max0.75 max0.045 max0.03 max17 – 199 – 120.1 max5*(C) min, 0.7 max
SS 321H0.04 min - 0.1 max2 max0.75 max0.045 max0.03 max17 - 199 - 12-4*(C) min, 0.6 max

This data helps to select these tubes for critical heat exchanger applications, promoting efficiency, durability, and longevity in challenging industrial settings.

Mechanical Properties of SS 321H Seamless U Tubes

The table below is a valuable resource, providing essential insights into the tube's strength, ductility, and other key characteristics.

GRADETensile StrengthYield Strength (0.2%Offset)ElongationBrinell HARDNESS (HBWRockwell HARDNESSVickers Hardness (HV)Heat Treating Temperature, min or range (°C)
SS 321515 min.205 min.35 %192 maxHRB- 90 max.200 max1040
SS 321H515 min.205 min.35 %192 maxHRB- 90 max.200 max1090

These properties are fundamental for ensuring optimal performance and longevity in heat exchanger systems.

Features of Stainless Steel 321H Seamless U Tubes:

  • High-Temperature Resistance: Stainless Steel 321H exhibits excellent resistance to high temperatures, making it suitable for applications where exposure to elevated temperatures is common.
  • Corrosion Resistance: The chromium content in 321H provides excellent corrosion resistance, even in harsh environments containing acids, alkalis, and salts. This makes these tubes ideal for use in corrosive industrial settings.
  • Stability Against Intergranular Corrosion: The addition of titanium to the alloy composition helps to stabilize the material against sensitization and subsequent intergranular corrosion, which can occur in certain environments.
  • Formability and Weldability: Stainless Steel 321H can be easily formed and welded, allowing for the fabrication of complex structures and components without sacrificing its mechanical properties.
  • Seamless Construction: The seamless manufacturing process ensures uniformity in wall thickness and internal surface finish, enhancing the overall strength and integrity of the tubes.

Applications of Stainless Steel 321H Seamless U Tubes:

  • Petrochemical Industry: Stainless Steel 321H Seamless U Tubes find extensive use in the petrochemical industry for applications such as heat exchangers, condensers, and process piping, where they must withstand high temperatures and corrosive fluids.
  • Power Generation: These tubes are employed in power generation plants for steam generation and heat transfer processes, owing to their ability to maintain structural integrity and corrosion resistance under high-temperature conditions.
  • Chemical Processing: In chemical processing plants, Stainless Steel 321H U Tubes are utilized for transporting corrosive chemicals and acids safely and efficiently, ensuring long-term reliability and minimal maintenance.
  • Aerospace and Aviation: The aerospace industry relies on Stainless Steel 321H tubes for manufacturing components in aircraft engines, exhaust systems, and other critical applications where lightweight, high-strength materials with excellent heat resistance are required.
  • Automotive Sector: In automotive manufacturing, these tubes are used in exhaust systems and catalytic converters, where they withstand the high temperatures and corrosive gases produced during engine operation.
  • Heat Treatment Furnaces: SS 321H Seamless U Tubes are employed in heat treatment furnaces for annealing, tempering, and other thermal processes, where they maintain their mechanical properties even at elevated temperatures.

Advantages of Stainless Steel 321H Seamless U Tubes:

  • Longevity: Stainless Steel 321H tubes offer exceptional durability and longevity due to their corrosion resistance and high-temperature stability, resulting in reduced maintenance costs and downtime.
  • Cost-Effectiveness: Despite being a premium alloy, the long-term benefits of using SS 321H Seamless U Tubes outweigh the initial investment, thanks to their extended service life and low maintenance requirements.
  • Versatility: These tubes are highly versatile and can be customized to suit specific application requirements, whether it involves high-pressure systems, extreme temperatures, or corrosive environments.
  • Environmental Compatibility: Stainless Steel 321H is environmentally friendly and fully recyclable, making it a sustainable choice for industries looking to minimize their carbon footprint and comply with stringent environmental regulations.
  • Consistent Performance: The uniformity and reliability of seamless construction ensure consistent performance across various operating conditions, contributing to enhanced safety and operational efficiency.

Stainless Steel 321H Seamless U Tubes offer a combination of exceptional features, versatile applications, and significant advantages, making them indispensable in critical industries where reliability, durability, and performance are paramount.

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