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| Brand Name: | YUHONG |
| Model Number: | ASTM A213 TP321 Stainless Steel Seamless U Bend Tube |
| MOQ: | 1000kgs |
| Payment Terms: | L/C,T/T |
ASTM A213 TP321H / UNS S32109 Stainless Steel Seamless Tube BA Bright Annealed Tube
According to ASTM A213, the final heat treatment for TP321H must be a solution anneal (thermal stabilization) at a temperature of at least 1100°C (2012°F) , followed by a rapid quench (usually water quench or rapid air cool depending on section size). This ensures the Titanium carbides are dissolved and the material is fully austenitic.
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
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| 321H | S32109 | S32169 | 07Cr19Ni10Ti | SUS321HTP | X10CrNiTi18-10 | 1.4878 | 12X18H10T |
Chemical Composition (%) of ASTM A213 TP321H / UNS S32109 / 1.4878 Stainless Steel Seamless Tube
| C | Mn | P | S | Si | Cr | Ni | Ti |
| 0.04-0.10 | 2.00 | 0.045 | 0.03 | 1.00 | 17.0-19.0 | 9.0-12.0 | 4(C+N)-0.7max |
Mechanical Properties of ASTM A213 TP321H / UNS S32109 / 1.4878 Stainless Steel Seamless Tube
| Tensile Strength min. | Yield Strength min. | Elongation (%) | Hardness max | |
| 75ksi (515MPa) | 30ksi (205MPa) | 35min | 192HBW/200HV | 90 HRB |
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.
