347 347H Seamless Capillary Pipe
Type：Seamless or Welded
Technique：Cold Finished/Argon Arc Welding
Material：Stainless Steel
Surface Treatment：Annealing and Pickling/Polished
Section Shape：Round
Length：Customized by Client and Typically 6000mm
Transport Package：Sea-Worthy Packing
Specification：OD 6.35~762mm
347 347H seamless Capillary Pipe
347 stainless steel capillary is a general-purpose niobium-stabilized stainless steel used in medium-high temperature environments (e.g., below 800°C), combining corrosion resistance and processing performance. 347H stainless steel seamless tube has a higher carbon content (0.04-0.10%) and forms more carbides through aging treatment, which is suitable for harsh working conditions (such as boiler superheaters, catalytic cracking equipment) with long-term service at high temperatures of 800-900°C.
Bright Annealing Stainless Steel 347 Capillary Tube
Advantages of 347 347H Stainless Steel Capillary Pipe
347 347H Stainless Steel thin-walled tubes are resistant to sulfur-containing flue gas (SO₂), high-temperature steam, and nitrate solutions, which is more than 40% better than 304 stainless steel.
Cold-drawn precision forming: outer diameter 0.5-20mm, wall thickness 0.1-2.0mm, tolerance ±0.03mm, bright annealing (Ra≤0.6μm)/electrolytic polishing (Ra≤0.2μm), meeting nuclear power grade cleanliness requirements.
Reasons to choose GNEE:
GNEE provides groove processing, eddy current flaw detection (ECT), and ASME certification application to reduce the inspection cost at the purchasing end.
Consult now to obtain the "347/347H Capillary Selection Manual", including the allowable stress table and welding process guide at different temperatures!
347 347H Stainless Steel Seamless Capillary pipe Specification
Chemical composition of 347/347H stainless steel precision tube
| Grade | C (%) | Cr (%) | Ni (%) | Nb+Ta (%) | Standards |
|---|---|---|---|---|---|
| 347 | ≤0.08 | 17–19 | 9–13 | ≥10×C% | ASTM A213 / GB/T 14976 |
| 347H | 0.04–0.10 | 17–19 | 9–13 | ≥10×C% | ASME SA213 / EN 10216-5 |
Mechanical Properties of 347/347H Capillary Tubes
| Property | Condition | 347 (UNS S34700) | 347H (UNS S34709) |
|---|---|---|---|
| Tensile Strength (MPa) | Room Temperature | ≥515 | ≥515 |
| Yield Strength (MPa) | Room Temperature | ≥205 | ≥205 |
| Elongation (%) | Room Temperature | ≥35 | ≥30 |
| Hardness (HB) | Annealed | ≤187 | ≤187 |
| Modulus of Elasticity (GPa) | Room Temperature | 193 | 193 |
| Coefficient of Thermal Expansion (10⁻⁶/°C) | 20–100°C | 17.2 | 17.2 |
| High-Temperature Allowable Stress (MPa) | 500°C | 110 | 125 |
| High-Temperature Allowable Stress (MPa) | 700°C | 45 | 60 |
| High-Temperature Allowable Stress (MPa) | 800°C | 18 | 28 |
| Creep Rupture Strength (MPa) | 700°C, 10,000h | 25 | 35 |
Stainless Steel Capillary Tube Exporters
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