ASTM A376 Grade 321 Heat-Resistant Seamless Pipe
Certification：ISO, RoHS, IBR, AISI, ASTM, GB, EN, DIN, JIS
Shape：round
Technique：Cold 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
ASTM A376 Grade 321 Heat-Resistant Seamless Pipe Distributor
For high-temperature piping systems, ASTM A376 Grade 321 seamless stainless steel pipe is a reliable solution, offering a combination of thermal stability, oxidation resistance, and mechanical performance.
GNEE is a trusted manufacturer and supplier of high-quality SA376 TP321 heat-resistant seamless pipes, widely used in thermal processing, petrochemical, and power generation industries. With extended intergranular corrosion resistance-1.5 times longer than conventional stainless steels-and backed by EN 10204 3.2 certification, our products ensure long service life in demanding conditions. Supported by an in-stock inventory of over 500 tons, we guarantee fast delivery within 5–7 days.
Advantages
The ASTM A376 Grade 321 seamless pipes supplied by GNEE fully comply with ASTM, ASME, EN, ISO, and PED standards, meeting the strictest quality and safety regulations worldwide. Even at elevated temperatures up to 870°C (1600°F), they effectively resist intergranular corrosion, making them an ideal material for boilers, superheaters, reformers, and heat exchangers.
TP321 seamless pipes offer a minimum tensile strength of 515 MPa and a yield strength of 205 MPa, maintaining stable mechanical performance under high thermal stress and pressure. With excellent dimensional uniformity and pressure integrity, they are easier to bend, weld, and fabricate than welded pipes, making them highly suitable for precision applications in critical industries.
GNEE 316 stainless seamless pipe in Stock
In addition to standard sizes with outer diameters ranging from 10–610mm and wall thicknesses of 1–30mm, GNEE also undertakes the production of thin-wall (≤0.8mm) high-precision tubes and thick-wall (≥30mm) high-pressure pipes. Custom lengths from 1 to 15 meters are available with a tolerance of ±1mm. Special processing services include inner surface polishing (Ra ≤ 0.4μm) and anti-oxidation coating on the outer surface, making these pipes suitable for precision applications such as aerospace fuel delivery systems and LNG high-temperature heat exchangers.
specification
| Standard | ASTM A376 / ASME SA376 |
|---|---|
| Grade | TP321 (UNS S32100 / EN 1.4541) |
| Outer Diameter | 6mm – 610mm |
| Wall Thickness | 1mm – 50mm |
| Length | Custom lengths available (up to 12m) |
| Tolerance (OD) | ±0.5mm (≤102mm), ±0.8% (>102mm) |
| Wall Tolerance | ±10% |
| Heat Treatment | Solution annealed (1050–1100°C, water quenched) |
| Non-Destructive Test | 100% Eddy Current or Hydro Test |
Chemical Composition Of ASTM A376 Stainless Steel 321 Seamless Pipes
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Other | |
| 321 | min. max |
– 0.08 |
2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 |
– | 9.0 12.0 |
0.10 | Ti=5(C+N) 0.70 |
ASTM A376 TP321 pipe Mechanical Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 321 | 515 | 205 | 40 | 95 | 217 |
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