AISI 321 Stainless Steel Tube

AISI 321 Stainless Steel Tube is a titanium-stabilized austenitic alloy optimized for exceptional resistance to intergranular corrosion, creep, and oxidation at elevated temperatures, making it a preferred material for high-stress, high-temperature fluid transport. Its seamless or welded tube configuration offers excellent structural integrity, pressure retention, and resistance to scaling, even in aggressive chemical and thermal environments. Key application areas include aerospace exhaust ducting, heat exchanger tubing, and high-purity chemical processing lines. Specific uses range from superheated steam conduits in power generation to corrosion-resistant lines in petrochemical refineries and cryogenic transfer systems. In research, AISI 321 tubing supports studies on high-temperature fatigue, hydrogen embrittlement mitigation, and advanced joining techniques for thermally stressed systems. Its combination of corrosion stability, mechanical reliability, and high-temperature resilience makes it invaluable for both industrial production systems and experimental setups requiring long-term material integrity under demanding service conditions.

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Tolerance

Properties

Reference & Citations

each

Tolerances

Tube

Outside Diameter	=<2mm	±0.05mm
Outside Diameter	2mm - 5mm	±0.1mm
Outside Diameter	>5mm	±5%
Wall Thickness		±10%

Material Properties for Alloys

Mechanical Properties

Element	Value
Hardness - Brinell	160-190
Elongation at break( % )	<60
Modulus of elasticity( GPa )	190-210
Izod impact strength( J m⁻¹ )	20-136
Tensile strength( MPa )	560

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	70-73
Temperature coefficient( K⁻¹ )	-

Thermal Properties

Element	Value
Maximum use temperature in air( C )	800
Melting point( C )	1400-1425
Thermal conductivity( W m⁻¹ K⁻¹ )	16.3@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	18@20-100°C