Introduction to JIS G3459 SUS321 Stainless Steel Seamless Pipes

Stainless steel seamless pipes are crucial components across various industries due to their outstanding corrosion resistance, durability, and versatility. Among the myriad of stainless steel grades, JIS G3459 SUS321 stands out for its exceptional properties and broad applications.
 
Chemical Composition:
SUS321 stainless steel seamless pipes adhere to rigorous chemical composition standards outlined in JIS G4303, typically comprising:
 
- Carbon (C): ≤ 0.08%
- 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: ≥ 520 MPa
- Yield Strength: ≥ 205 MPa
- Elongation: ≥ 40%
- Hardness: ≤ 217 HBW
 
Inspection and Testing Standards:
SUS321 seamless pipes undergo meticulous quality assessments, including non-destructive testing methods like ultrasonic examination, ensuring adherence to industry standards and specifications.
 
Heat Treatment Condition:
SUS321 stainless steel seamless pipes are typically supplied in the annealed condition to optimize their corrosion resistance and mechanical properties.
 
Impact Temperature:
SUS321 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 processing industry: Reactors, heat exchangers, and piping systems handling corrosive chemicals.
- Aerospace industry: Aircraft exhaust systems, engine components, high-temperature applications.
- Petrochemical industry: Refinery equipment, gas processing units, pipelines for high-temperature fluids.
- Automotive industry: Exhaust systems, catalytic converters, automotive components subjected to high temperatures.
- Power generation: Boiler tubes, steam piping, and turbine components in power plants.
 
Size Range and Supply Cases:
- Diameter: 6 mm to 406 mm
- Wall Thickness: 0.5 mm to 20 mm
 
Relevant Supply Cases:
1. Chemical Plant Expansion: Supply of SUS321 seamless pipes for the expansion of a chemical processing facility, ensuring resistance to corrosive chemicals and high temperatures.
2. Aerospace Manufacturing: Provision of SUS321 seamless pipes for the production of aircraft exhaust systems, meeting stringent requirements for high-temperature performance and durability.
3. Power Plant Upgrade: Delivery of SUS321 seamless pipes for the renovation of boiler tubes in a power generation facility, ensuring reliability and longevity under high-temperature conditions.
 
JIS G3459 SUS321 stainless steel seamless pipes offer exceptional corrosion resistance, mechanical strength, and thermal stability, making them indispensable across diverse industries. With stringent quality control measures and varied supply options, these pipes provide reliable solutions for critical infrastructure projects and industrial applications.