ASTM A312 TP321H Stainless Pipe For High-Temperature Service
Name：ASTM A312 TP321H Stainless Pipe for High-Temperature Service
Certification：ISO, RoHS, IBR, AISI, ASTM, GB, EN, DIN, JIS
Shape：round
Technique：Cold Rolled/Hot Rolled
Surface Treatment：Sanded /Mirror/Hairline Brushed
Thickness：0.3-30mm
out Diameter：8-219mm
Length：5.8/6m or Custom
Stock：in Stock
Sample：Available
Transport Package：Standard Sea-Worthy Packing
Send E-mail:info@gneestainless.com
Tel:+8615824687445
Description
Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of astm a312 tp321h stainless pipe for high-temperature service in China. With abundant experience, we warmly welcome you to wholesale customized astm a312 tp321h stainless pipe for high-temperature service from our factory. For price consultation, contact us.
ASTM A312 TP321H is a titanium-stabilized, high-carbon (0.04%–0.10%) austenitic stainless steel pipe designed specifically for elevated-temperature service above 540°C (1000°F). The "H" grade delivers superior creep-rupture strength, while the titanium addition prevents intergranular corrosion in harsh thermal environments.
ASTM A312 TP321H Pipe Manufacturer
GNEE is a leading supplier of 321H stainless steel pipe, dedicated to offering high-quality products on the market at highly competitive prices. Our ASTM A312 TP321H stainless steel round pipes can be manufactured using seamless or welded processes and operate reliably within a temperature range of 800–1500°F (approx. 427–818°C).
ASTM A312 TP321H seamless stainless steel pipe is manufactured from a solid billet, featuring a tensile strength exceeding 515 MPa and a yield strength exceeding 205 MPa. It exhibits no post-weld carburization or corrosion issues, offering high strength, long service life, and low maintenance requirements. UNS S32109 ERW (Electric Resistance Welded) pipe is produced via fusion welding processes, achieving elongation of up to 40% while maintaining excellent performance and strength.
GNEE can provide Material Test Certificates (MTC) compliant with the EN 10204 3.1 standard, containing information such as heat number, chemical composition, mechanical properties, heat treatment status, dimensions, and test results.
If you are interested in our products and services, please feel free to contact us. Our team is ready to provide you with support and assistance at any time!
Stainless Steel 321 Pipe Specification
| Parameter | Specification |
|---|---|
| Material Grade | TP321H / UNS S32109 |
| Standard | ASTM A312 / ASME SA312 |
| Product Type | Seamless or Welded Stainless Steel Pipe |
| Stabilizing Element | Titanium (Ti) |
| Main Characteristic | High-Temperature Strength & Resistance to Sensitization |
| Common Applications | Oil Refineries, Boiler Tubes, Superheaters, Heat Exchangers |
| Outside Diameter (OD) | 1/8" to 30" (10.3 mm to 762 mm) |
| Wall Thickness (WT) | ±12.5% of Nominal Wall Thickness |
| Pipe Schedule | SCH 5S, 10S, 40S, 80S, 160, XXS |
| Length | Single Random Length, Double Random Length, or Cut-to-Length |
ASTM A312 TP321H Stainless Steel Pipe Chemical Composition
| Element | Content (Weight %) |
|---|---|
| Carbon | 0.04–0.10 |
| Manganese | ≤ 2.00 |
| Phosphorus | ≤ 0.045 |
| Sulfur | ≤ 0.030 |
| Silicon | ≤ 1.00 |
| Chromium | 17.0–19.0 |
| Nickel | 9.0–12.0 |
| Titanium | 4 × (C + N) min – 0.70 max |
| Nitrogen | ≤ 0.10 |
UNS S32109 Stainless Steel Pipe Mechanical Properties
| Property | Tensile Strength (Rm) | Yield Strength (Rp 0.2) | Elongation (A5) | Hardness (Brinell) | Hardness (Rockwell B) |
|---|---|---|---|---|---|
| Requirement | ≥ 515 MPa (75 ksi) | ≥ 205 MPa (30 ksi) | ≥ 35% Longitudinal / ≥ 25% Transverse | ≤ 192 HBW | ≤ 90 HRB |
Heat Treatment & Grain Size
For "H" grades, the heat treatment process is crucial for ensuring high-temperature performance.
| Process | Temperature | Cooling Method |
| Solution Annealing | Minimum 1925°F (1050°C) | Rapid cooling / Quenching |
| Grain Size (ASTM E112) | ASTM No. 7 or coarser | Required for creep resistance |
TP321 vs. TP321H Stainless Steel Pipe
| Feature | TP321 | TP321H |
| Carbon Content | Max 0.08% | 0.04% - 0.10% |
| Min. Solution Temp. | No specific min temp required | Min 1925°F (1050°C) |
| Grain Size Requirement | Not specified | No. 7 or coarser |
| Operating Temperature | Moderate high temperature | Preferred for >1000°F (538°C) |
What are the applications of TP321H?
Oil refineries: Hydrocracking piping, fluid catalytic cracking (FCC) units.
Power industry: Boiler superheater tubes, reheater tubes, steam piping.
Chemical industry: High-temperature exhaust gas treatment systems, heat exchanger tube bundles.
Aviation/Automotive: Piston engine exhaust manifolds, turbocharger housings (leveraging its heat resistance).
If you need specific data, tell me:
Are you looking for seamless or welded pipe?
What size and schedule do you need?
What is your operating temperature and pressure?
Quality Control
GNEE can arrange 100% PMI (Positive Material Identification) to verify the TP321H grade and key alloying elements, while also providing chemical composition analysis, tensile testing, yield strength testing, elongation testing, hardness testing, dimensional inspection, wall thickness measurement, straightness checks, and surface appearance inspections. For TP321H welded pipes, additional weld-related inspections can be arranged in accordance with procurement specifications. Upon project request, GNEE can provide hydrostatic testing or non-destructive electrical testing services compliant with ASTM A312 standards.
Packaging
| End Protection | Plastic Caps or Plugs on both ends to prevent debris and protect bevels. |
| Surface Treatment | Bare (no oil) or Lightly Oiled / Pickled & Passivated surface. |
| Bundling |
Hexagonal bundles secured with steel straps for small diameters . |
| Outer Wrapping | Plastic film or woven bags to prevent seawater/dust contamination. |
| Crating | Wooden Boxes / Plywood Cases for thin-wall or high-precision tubes. |
| Lifting Material | Nylon slings or cloth belts to avoid scratches from steel chains. |
FAQ
Q: What is the difference between TP321H and TP347H?
A: TP321H is alloyed with titanium (Ti), while TP347H is alloyed with niobium (Nb). Since niobium carbides are more stable than titanium carbides, TP347H may offer slightly better performance in extremely harsh chemical environments or applications involving repeated welding. TP321H is generally more cost-effective and easier to source than TP347H, making it the standard choice for most high-temperature industrial piping applications.
Q: Does TP321H piping require post-weld heat treatment (PWHT)?
A: Generally, no. As TP321H is a stabilized grade, solution annealing is typically not required after welding to restore corrosion resistance. However, in certain extremely high-temperature or highly corrosive environments, design specifications may require stabilization annealing at 845°C–900°C to ensure complete bonding of carbon with titanium, thereby achieving optimal corrosion resistance.
Q: What are the common failure modes for TP321H?
A: Despite its high-temperature resistance, TP321H is susceptible to stress corrosion cracking in moist environments containing chloride ions. Prolonged exposure to temperatures between 590°C and 870°C can lead to the precipitation of brittle sigma (Σ) phases within the material, resulting in reduced room-temperature toughness (although toughness at high temperatures is maintained).
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