ASTM A312 TP304H Stainless Steel Seamless Pipe
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In terms of production technology, GNEE adopts a fully automatic continuous solution annealing furnace. Pipes are heated to temperatures above 1040°C, followed by rapid water quenching under precise ultrasonic temperature control. This process effectively eliminates internal stresses and prevents carbide precipitation. At the same time, the grain size is strictly controlled at ASTM No. 7 or coarser, and the carbon content is stabilized within 0.04%–0.10%, which directly ensures the excellent creep resistance and long-term strength of 304H pipes in environments exceeding 525°C.
304H stainless steel round pipes can be manufactured using both seamless and welded processes. ASTM A312 TP304H seamless pipes offer outstanding corrosion resistance across a wide range of aggressive environments. With titanium stabilization, the material achieves enhanced strength and durability. ASME SA312 304H welded pipes are produced using a longitudinal welding process, with the option of retaining or removing the weld seam. UNS S30409 ERW pipes are manufactured from strip or coil (typically 12NB), with welded joints forming the cross-section.
We provide a full size range from NPS 1/8" to 24", with wall thickness up to Sch 160 / XXS, and lengths up to 26 meters. Customization of various shapes and dimensions is available to meet specific project requirements.
If you have any questions or would like to learn more about our products,especially ASTM A312 TP304H Schedule 40 pipes-please feel free to contact us.
Chemical Composition of ASTM A312 TP304H pipe
| Grade | C | Mn | Si | P | S | Cr | Ni | |
| TP304H | min. | 0.04 | - | - | 0.045 | - | 18 | 8 |
| max. | 0.1 | 2 | 0.75 | - | 0.03 | 20 | 10.5 | |
TP304H 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 |
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| TP304H | 515 | 205 | 40 | 92 | 201 |
| TP304H also has a requirement for a grain size of ASTM No 7 or coarser. | |||||
UNS S30409 stainless steel pipe Physical Properties
| Grade | Density (kg/m3) | Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion (μm/m/ºC) | Thermal Conductivity (W/m.K) | Specific Heat 0-100ºC (J/kg.K) | Electrical Resistivity (nΩ.m) |
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| 0-100ºC | 0-315ºC | 0-538ºC | at 100ºC | at 500ºC | |||||
| TP304H | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
ASTM A312 Standard Tolerance
| NPS Designator | Tolerance, % from Nominal | |
| Over | Under | |
| ⅛ to 2½ incl., all t/D ratios | 20.0 | 12.5 |
| 3 to 18 incl., t/D up to 5% incl. | 22.5 | 12.5 |
| 3 to 18 incl., t/D > 5% | 15.0 | 12.5 |
| 20 and larger, welded, all t/D ratios | 17.5 | 12.5 |
| 20 and larger, seamless, t/D up to 5% incl. | 22.5 | 12.5 |
| 20 and larger, seamless, t/D > 5% | 15.0 | 12.5 |
What are the differences between TP304H and TP304?
TP304 has a maximum carbon content of 0.08% and is designed for general corrosion resistance, while TP304H has a carbon content of 0.04% to 0.10% and is specifically designed to improve creep strength at high temperatures.
ASTM A312 TP304H Stainless Steel Seamless Pipe price
ASTM A312 TP304H stainless steel seamless pipes typically cost between $1.50 and $9.00 per kilogram (approx. $1,300–$4,000+ per ton), depending on the supplier, pipe schedule (thickness), and quantity. High-temperature, high-carbon 304H seamless pipes are mainly used in power, oil, and gas industries.
Click to get the price of 304H stainless steel pipe
We provide manufacturer test certificates (TCs), raw material certificates, high-temperature/non-destructive testing reports, and third-party inspection reports conforming to EN 10204/3.1B standards.
Quality Inspection
We ensure that all materials undergo rigorous quality testing before shipment.
• Mechanical property testing
• Hardness testing
• Chemical composition analysis - spectral analysis
• Material composition identification - PMI testing
• Flattening test
• Flaring test
• Intergranular corrosion (IGC) test
304H Stainless Steel Pipe Packaging
Our 304H stainless steel pipe products are all specially packaged to ensure they are not damaged during transportation. Export products use standard export packaging, using wooden crates or boxes. All 304H stainless steel pipes are marked with the trademark (company logo), grade, size, and batch number. Custom marking services are also available upon request.
