Key Feature

The Titanium-Stabilized High-Temperature Piping Solution. Superior high-temperature strength and oxidation resistance with guaranteed protection against sensitization in welded and high-temperature service.

The benchmark material for piping systems requiring both welding integrity and continuous high-temperature performance.

Common Designations

UNS S32100
AISI 321
ASTM A312 TP321 (Seamless/Welded)
ASTM A358 TP321 (EFW)
EN 1.4541, X6CrNiTi18-10
JIS SUS321

EN 1.4541 is the primary European designation for titanium-stabilized grades.

Chemical Composition (Typical wt.%)

C: ≤ 0.08
Cr: 17.0 - 19.0
Ni: 9.0 - 12.0
Ti: ≥ 5×C (typically 0.40-0.70%)Mn: ≤ 2.00
Si: ≤ 0.75

Titanium content (minimum 5× carbon) ensures complete stabilization against sensitization.

Mechanical Properties

Tensile Strength: ≥ 515 MPa
Yield Strength: ≥ 205 MPa
Elongation: ≥ 40%
Hardness: ≤ 201 HB

Maintains strength better than 304 at elevated temperatures.

High-Temperature Properties

Continuous Service: Up to 900°C
Intermittent Service: Up to 925°C
Oxidation Resistance: Excellent up to 870°C
Creep Strength: Better than 304/304L

Superior to both 304 and 304L in high-temperature piping applications.

Physical Properties

Density: 7.90 g/cm³
Melting Range: 1400 - 1450 °C
Thermal Expansion: 17.2 × 10⁻⁶/K (20-100°C)
Thermal Conductivity: 16.3 W/m·K (100°C)
Non-magnetic when annealed

Slightly lower thermal expansion than 304, beneficial for thermal cycling.

Corrosion Resistance

Excellent general corrosion resistance similar to 304. Superior resistance to intergranular corrosion after exposure to sensitizing temperatures (425-850°C).

Specifically designed to prevent weld decay in high-temperature corrosive environments.

Welding Characteristics

Excellent weldability with all standard methods
No Post-Weld Annealing required
Ti Stabilization prevents sensitization in HAZ
Suitable for Heavy Wall piping

Titanium provides stabilization during welding and subsequent high-temperature service.

Pressure Ratings

Schedule 10S/40S: Standard process piping
Schedule 80S/160: High pressure/temperature service
ASME B31.1/B31.3 compliance

Designed for high-temperature pressure applications per piping codes.

Key Standards

ASTM A312 TP321: Seamless & Welded Pressure Pipe
ASTM A358 TP321: EFW Pipe
ASTM A269 TP321: Tubing
EN 10216-5: Seamless Pressure Tubes
ASME SA312: Code Construction
ISO 1127: Stainless Steel Tubes

Comprehensive standardization for quality assurance.

Common Applications

• Heat Exchangers: Tube sheets, U-bends, shell and tube exchangers
• Power Generation: Superheater tubes, boiler components, steam piping
• Chemical Processing: High-temperature reactors, reformer piping, pyrolysis systems
• Aerospace: Engine exhaust systems, afterburner piping
• Automotive: Exhaust manifolds, turbocharger piping, emission systems
• Industrial Heating: Furnace piping, radiant tubes, burner systems
• Food Processing: High-temperature processing lines, sterilization systems

Specifically designed for high-temperature and thermally cycled piping systems.