ASTM A312 TP321H S32109 12X18H10T Stainless Steel Seamless Pipe For Refinery
ASTM A312 TP321H is a hot finished and cold finished austenitic stainless steel seamless pipe manufactured to ASTM A312 standard specification. ASTM A312 covers seamless, welded, and heavily cold-worked austenitic stainless steel pipes intended for high-temperature and general corrosive service. TP321H is the high-carbon variant of TP321 stainless steel, stabilized with titanium. The added titanium binds carbon in the alloy to prevent chromium carbide precipitation during welding or high-temperature exposure, which eliminates intergranular corrosion risk. The suffix “H” denotes the higher controlled carbon content range for improved high-temperature creep and rupture strength compared with standard TP321. Our ASTM A312 TP321H Stainless Steel Seamless Pipes are widely used in laboratory equipments, petrochemical industry, oil & gas plant, food processing industry, and some chemical processing industries.
Chemical Composition (wt%):
| Element |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Ti |
| Min |
0.04 |
— |
— |
— |
— |
17.0 |
9.0 |
5×C min |
| Max |
0.10 |
2.00 |
0.045 |
0.030 |
1.00 |
19.0 |
12.0 |
0.70 |
Mechanical Properties:
| Tensile Strength, min |
515 MPa (75 ksi) |
| Yield Strength (0.2% offset), min |
205 MPa (30 ksi) |
| Elongation (2 inch / 50 mm gauge), min |
35% |
| Hardness Max |
HB ≤ 192; HRB ≤ 90 |
Main Features:
High temperature resistance
Stabilized against intergranular corrosion
Good general corrosion resistance
Excellent weldability
Good formability and toughness
Typical Applications:
- Power industry: Boiler superheater tubes, reheater tubes, steam piping, high temperature flue gas lines in thermal power plants
- Petrochemical & refinery: High temperature process piping, furnace tubes, heat exchanger tubes, cracking units
- Oil & gas: High temperature process pipelines, wellhead auxiliary piping under high thermal cycling
- Chemical industry: High temperature reactor piping, organic chemical synthesis equipment
- Energy: Waste incineration plant piping, solar thermal heat transfer lines
- Aerospace auxiliary piping, high temperature manifold systems
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