ASTM A240 321 321H Titanium Stabilized Hot Rolled Stainless Steel Plate for High Temperature Service with No.1 Finish
ASTM A240 321 and 321H hot rolled stainless steel plates are titanium-stabilized austenitic grades designed for service in the carbide precipitation temperature range of 425-815°C (800-1500°F). The titanium addition (5*C minimum) preferentially combines with carbon, preventing chromium carbide formation at grain boundaries and eliminating intergranular corrosion susceptibility after welding or prolonged thermal exposure.
321H (UNS S32109), with higher carbon content (0.04-0.10%), provides enhanced elevated temperature strength and creep resistance for applications above 540°C. Available in No.1 finish, these plates are ideal for high-temperature pressure vessels, expansion joints, and refinery equipment where post-weld heat treatment is impractical.
| Parameter | Specification |
|---|---|
| Standard | ASTM A240 / ASME SA240 |
| Steel Grade | 321 (UNS S32100) / 321H (UNS S32109) |
| Manufacturing Process | Hot Rolled |
| Thickness Range | 3.0mm - 100mm |
| Width Range | 1500mm, 2000mm, 2500mm, 3000mm |
| Length Range | 6000mm, 12000mm or Custom |
| Surface Finish | No.1 (Hot Rolled, Annealed, Pickled) |
| Service Temperature | Up to 815°C (1500°F) |
| Stabilization | Titanium Stabilized (5*C min) |
| Element | 321 (S32100) | 321H (S32109) |
|---|---|---|
| Carbon (C) | ≤0.08 | 0.04 - 0.10 |
| Manganese (Mn) | ≤2.00 | ≤2.00 |
| Silicon (Si) | ≤1.00 | ≤1.00 |
| Chromium (Cr) | 17.0 - 19.0 | 17.0 - 19.0 |
| Nickel (Ni) | 9.0 - 12.0 | 9.0 - 12.0 |
| Titanium (Ti) | 5*(C+N) min, ≤0.70 | 4*(C+N) min, ≤0.70 |
| Property | 321 | 321H |
|---|---|---|
| Tensile Strength (min) | ≥515 MPa | ≥515 MPa |
| Yield Strength (min) | ≥205 MPa | ≥205 MPa |
| Elongation (min) | ≥40% | ≥40% |
| Hardness (max) | ≤217 HBW | ≤217 HBW |
- Petrochemical: Refinery heater tubes, expansion bellows, thermal oxidizer components
- Power Generation: Boiler superheater tubes, steam line expansion joints, turbine exhaust
- Aerospace: Aircraft exhaust manifolds, afterburner components, firewalls
- Chemical Processing: High-temperature reactors, heat exchangers, thermal fluid systems
- Automotive: Turbocharger components, exhaust manifolds, EGR system components
- Industrial: Furnace conveyor belts, annealing boxes, heat treating fixtures
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.