ASTM A213 TP321H / EN 1.4878 Stainless Steel Seamless Tube Bright Annealed Heat Exchanger Tube

ASTM A213 TP321H / UNS S32109 Stainless Steel Seamless Tube BA Bright Annealed Tube

TP321H is a "stabilized" stainless steel. It contains Titanium (Ti) at least five times the carbon content.

• Why Stabilized? In standard 304/316 stainless steel, when heated to high temperatures (800°F - 1500°F / 427°C - 816°C), carbon can combine with chromium to form chromium carbide at the grain boundaries (sensitization). This reduces corrosion resistance.

• The "H" Difference: The Titanium in this alloy has a higher affinity for carbon than chromium does. It forms Titanium carbides instead, leaving the chromium in solid solution to maintain corrosion resistance.

Equivalent Grade of ASTM A213 TP321H / UNS S32109 / 1.4878 Stainless Steel Seamless Tube

Mechanical Properties of ASTM A213 TP321H / UNS S32109 / 1.4878 Stainless Steel Seamless Tube

321H, Key Advantages of the "H" Grade

• High-Temperature Strength: The controlled higher carbon content provides superior creep strength and stress rupture properties above 1000°F (537°C) compared to standard TP321.

• Aqueous Corrosion Resistance: Similar to TP304 in most environments, but stabilized against intergranular corrosion after welding or high-temperature exposure.

• Oxidation Resistance: Resists scaling up to about 1650°F (900°C) in continuous service.

• Petrochemical Refining: Fluid catalytic cracking units, reformers, and hydrogen plants.
• Power Generation: Superheaters and reheaters in boilers.
• Aerospace: Exhaust stacks and manifolds.
• Chemical Processing: High-temperature process piping where sensitization is a concern during shutdowns or startups.
• Heat Exchanger
• Boiler