Introduction:

Stainless steel seamless pipes play a vital role in various industries due to their exceptional corrosion resistance, durability, and versatility. Among the numerous stainless steel grades available, JIS G3459 SUS321H stands out for its superior properties and wide-ranging applications.

 

Chemical Composition:

SUS321H stainless steel seamless pipes adhere to stringent chemical composition standards outlined in JIS G4303, typically comprising:

 

- Carbon (C): ≤ 0.10%

- Silicon (Si): ≤ 1.00%

- Manganese (Mn): ≤ 2.00%

- Phosphorus (P): ≤ 0.045%

- Sulfur (S): ≤ 0.030%

- Chromium (Cr): 17.00% - 19.00%

- Nickel (Ni): 9.00% - 12.00%

- Titanium (Ti): 5*(C+N)% - 0.70%

 

Mechanical Properties:

- Tensile Strength: ≥ 515 MPa

- Yield Strength: ≥ 205 MPa

- Elongation: ≥ 40%

- Hardness: ≤ 217 HBW

 

Inspection and Testing Standards:

SUS321H seamless pipes undergo stringent quality assessments, including non-destructive testing methods such as ultrasonic examination, ensuring compliance with industry standards and specifications.

 

Heat Treatment Condition:

SUS321H stainless steel seamless pipes are typically supplied in the annealed condition to optimize their mechanical properties and corrosion resistance.

 

Impact Temperature:

SUS321H seamless pipes exhibit excellent toughness and can withstand impact at temperatures ranging from -196°C to 800°C, making them suitable for a wide range of operating conditions.

 

Main Applications:

- Chemical and petrochemical industry: Reactors, heat exchangers, and piping systems handling corrosive chemicals and high temperatures.

- Aerospace industry: Aircraft exhaust systems, engine components, high-temperature applications.

- Automotive industry: Exhaust systems, automotive components subjected to high temperatures.

- Power generation: Boiler tubes, steam piping, and turbine components in power plants.

- Food processing industry: Food processing equipment, storage tanks, and pipelines.

 

Size Range and Supply Cases:

- Diameter: 6 mm to 406 mm

- Wall Thickness: 0.5 mm to 20 mm

 

Relevant Supply Cases:

1. Petrochemical Plant Expansion: Supply of SUS321H seamless pipes for the expansion of a petrochemical plant, ensuring resistance to corrosive chemicals and high temperatures.

2. Aerospace Component Manufacturing: Provision of SUS321H seamless pipes for the production of aerospace components, meeting stringent requirements for high-temperature performance and durability.

3. Power Plant Refurbishment: Delivery of SUS321H seamless pipes for the renovation of boiler tubes in a power generation facility, ensuring reliability and longevity under high-temperature conditions.

 

Conclusion:

JIS G3459 SUS321H stainless steel seamless pipes offer exceptional corrosion resistance, mechanical strength, and thermal stability, making them indispensable in various industries. With rigorous quality control measures and diverse supply options, these pipes provide reliable solutions for critical infrastructure projects and industrial applications.