YUHONG HOLDING GROUP CO., LTD
| Standard | ASTM A213, ASME SA213 |
| Thickness | BWG10-25 |
| Delivery Time | 7 DAYS |
| End | Plain End, Beveled End |
| Product Name | Stainless Steel Seamless Tube |
| OD | 1/4" , 3/8", 1/2", 5/8", 3/4", 1", 1.1/4", etc. |
| Payment Terms | L/C,T/T |
| Length | Single Random, Double Random & Cut Length |
| Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap |
| High Light | ASTM A213 TP347H Stainless Steel Seamless Tube, UNS S34709 Heat Exchanger Tube |
| Material | TP347H, UNS S34709, 1.4961 |
| Model Number | ASME SA213 TP347H Stainless Steel Seamless Tube |
| Brand Name | YUHONG |
| Place of Origin | CHINA |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
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Product Specification
| Standard | ASTM A213, ASME SA213 | Thickness | BWG10-25 |
| Delivery Time | 7 DAYS | End | Plain End, Beveled End |
| Product Name | Stainless Steel Seamless Tube | OD | 1/4" , 3/8", 1/2", 5/8", 3/4", 1", 1.1/4", etc. |
| Payment Terms | L/C,T/T | Length | Single Random, Double Random & Cut Length |
| Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap | High Light | ASTM A213 TP347H Stainless Steel Seamless Tube, UNS S34709 Heat Exchanger Tube |
| Material | TP347H, UNS S34709, 1.4961 | Model Number | ASME SA213 TP347H Stainless Steel Seamless Tube |
| Brand Name | YUHONG | Place of Origin | CHINA |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
ASME SA213 UNS S34709 / TP347H Stainless Steel Seamless Tube Pickled Annealed Heat Exchanger Tube
ASME SA213 TP347H / UNS S34709 is a Nb-stabilized austenitic stainless steel seamless tube with high-temperature creep strength and sensitization resistance. This material is very common used in heat exchangers. EN 1.4961 is a related European grade, but it has different Cr/Ni chemistry. They can be dual-certified only with tight chemistry control. For ASME work, order and certify to ASME SA213 TP347H UNS S34709 — do not accept EN 1.4961 alone as a substitute.
SCC limits: TP347H resists polythionic acid SCC if properly solution-annealed, but it is not immune to chloride SCC.
When engineers choose TP347H?
High-temperature creep service
Above about 550–600°C, 304H and 316H allowable stresses drop rapidly. TP347H has higher allowable stress in the 500–700°C range, so it can allow thinner walls, higher pressure, or longer life.
Polythionic acid SCC risk
In refinery hydroprocessing, catalytic cracking, and similar units, polythionic acid can form during shutdown. Sensitized 304H/316H can crack. TP347H is stabilized with Nb, so it resists sensitization and is a standard choice.
Welded construction without PWHT
TP347H is often used where post-weld heat treatment is impractical. The Nb stabilization reduces chromium carbide precipitation in the HAZ, lowering sensitization risk.
Long-term exposure to 425–815°C
In this sensitization range, unstabilized grades can form chromium carbides at grain boundaries. TP347H ties up carbon as NbC, maintaining corrosion resistance.
Power plant superheaters/reheaters
For steam temperatures around 540–620°C, TP347H is a common upgrade from 304H/316H when creep strength is limiting.
Cost-effective step below 310H or nickel alloys
If 310H or Alloy 800H is over-specified, TP347H can be a lower-cost alternative — provided chlorides and sulfidation are not severe.
Equivalent Grade OF ASME SA213 TP347H / UNS S34709 Stainless Steel Seamless Tube
| JIS | GB | STANDARD | WERKSTOFF NR. | UNS |
|---|---|---|---|---|
| SUS347H | 07Cr18Ni11Nb | SS 347H | 1.4961 | S34709 |
Chemistry Composition% of ASME SA213 TP347H / UNS S34709 Stainless Steel Seamless Tube
| C | Si | Mn | P | S | Cr | Ni | Nb |
| 0.04-0.10 | 1.00 max | 2.00 max | 0.045 max | 0.030 max | 17.0-19.0 | 9.0-13.0 | 8*C-1.1 |
| Tensile Strength , MPa | Yield Strength, MPa | Elongation, % | Hardness, Rockwell B |
| 515 min | 205 min | 40 min | 92 |
Do not substitute one for the other without a thorough engineering review.
Using standard 347 where 347H is specified could lead to premature creep failure and rupture under high stress at temperature.
Using 347H where standard 347 is specified is often overkill, may be more expensive, and the coarse grain structure offers slightly lower yield strength at room temperature, which could be a design consideration for fabrication.
The "H" is a specific pedigree for the most demanding high-temperature, high-stress environments in the energy and process industries.
Application
Refinery heat exchangers and furnace tubes
Power plant superheaters and reheaters
Petrochemical steam/gas heat exchangers
High-temperature steam service
Applications needing resistance to polythionic acid SCC
Company Details
Business Type:
Manufacturer,Importer,Exporter,Trading Company,Seller,Other
Year Established:
1990
Total Annual:
50M-70M
Employee Number:
50~800
Ecer Certification：
Verified Supplier
Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories, the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always. &n... Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories, the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always. &n...
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