astm a213 tp347h tube
2. Standard: ASTM A213 / ASME SA213, standard specification for seamless boiler, superheater, and heat-exchanger tubes
3. Process: Advanced multi-pass precision cold drawing, eliminating micro-flaws to ensure seamless structural security
4. Size Range: Outer Diameter from 3.18mm to 127mm with stringent wall gauge controls for high-reliability assemblies
5. Heat Treatment: Mandatory high-temperature solution annealing above 1040°C to lock optimal carbide grain size distribution
6. Surface Finish: Clean uniform pickled matte or bright annealed (BA) in a protective gas atmosphere profile
7. Application: Ultra-supercritical boiler headers, heavy chemical reactor coils, and power plant steam heat exchangers
8. Service Advantage: Sourced from tier-one steel billets, full grain size control testing, and MTC 3.1 provided with shipment
9. Packaging: Each tube individually capped and plastic-sleeved, securely nested in robust export plywood crates
10. Key Advantage: Exceptional creep-rupture strength and absolute resistance to polythionic acid cracking under sustained thermal stress
ASTM A213 TP347H Tube – High-Temperature Niobium-Stabilized Seamless Boiler Tubing for Superior Creep Resistance
Hebei All Trust Steel Co., Ltd manufactures precision-engineered astm a213 tp347h tube featuring advanced niobium stabilization technology specifically designed for ultra-supercritical power generation and high-temperature chemical processing systems. Our TP347H grade provides excellent creep-rupture strength at temperatures exceeding 538°C coupled with guarantyd intergranular corrosion resistance. Our seamless tubes are produced in outer diameters ranging from 3.18mm to 127mm with an annual manufacturing capacity of over 15,000 tons, 100% hydraulic testing and rigorous ASTM/ASME compliance. All batches are solution annealed at above 1040°C and completely ultrasonically thickness scanned as a matter of course, guaranteeing your important thermal infrastructure total structural integrity.
What Makes TP347H Tubing Essential for High-Temperature Service?
The product is a specialised progression of austenitic stainless steel engineering. "H" grade has larger range of carbon content 0.04-0.10 % as compared to normal 347 grade. The regulated addition of carbon leads to a considerable increase in creep strength under long term thermal loading.
The key metallurgical benefit is stabilisation with niobium. Typical stainless steels are prone to precipitation of chromium carbides at grain boundaries, when subjected to temperatures between 425°C and 815°C. This sensitisation is the reason for catastrophic intergranular corrosion in heat impacted zones.
Our TP347H tubing has niobium in an amount at least 8 times the carbon content. The niobium prefers to form stable carbides while the chromium remains entirely in the austenite matrix. This stabilisation mechanism may completely avoid sensitisation.
The mandatory coarse grain size (ASTM No. 7 or larger) further reduces grain boundary density. Fewer boundaries mean fewer sites for creep deformation initiation. This grain structure optimization delivers measurably longer service life in superheater headers and reactor coils operating continuously above 1000°F.
Technical Specifications of ASTM A213 TP347H Tube
| Parameter | Specification |
|---|---|
| Standard | ASTM A213 / ASME SA213 / EN 10216-5 |
| Product Type | Seamless Niobium-Stabilized Boiler Tube |
| Material Grade | TP347H (UNS S34709 / 1.4912) |
| Manufacturing Process | Cold Drawn / Cold Rolled / Solution Annealed |
| Outer Diameter | 3.18 mm – 127 mm (1/8" – 5") |
| Wall Thickness | 0.38 mm – 12.7 mm (0.015" – 0.500") |
| Length | 5.8 m / 6 m / 11.8 m / 12 m / Custom Cut |
| Surface Finish | Pickled / Bright Annealed (BA) / Polished |
| Carbon Content | 0.04 – 0.10% (H-Grade) |
| Chromium | 17 – 19% |
| Nickel | 9 – 13% |
| Niobium | 8 × C (min), 1.10% (max) |
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Grain Size | ASTM No. 7 or Coarser |
| Heat Treatment | Solution Annealed ≥ 1040°C, Rapid Quenched |
| NDT Testing | 100% Eddy Current / Ultrasonic / Hydrostatic |
| Quality Certificates | EN 10204 3.1/3.2 MTC / ISO 9001:2015 |
| End Type | Plain End / Beveled / Square Cut |
| Packaging | Plywood Cases / Fumigated Wooden Boxes / Plastic End Caps |
Why Choose Our TP347H Seamless Tubes?
Material & Functional Superiority
Our product is manufactured from superior virgin stainless steel billets from Tier One mills. High temperature creep strength is maximised, and there is extraordinary resistance to intergranular corrosion and grain boundary sensitisation due to niobium stabilisation.
You have assurance of structural robustness up to 815°C. The regulated grain size and carbon content provides greater performance in power grid heat extremes where common alloys fail .
Production Quality & Testing Rigor
Every tube undergoes advanced multi-pass precision cold drawing. This process eliminates micro-flaws and ensures seamless structural security. Mandatory stabilization heat treatments above 1040°C lock optimal carbide grain size distribution.
We perform 100% volumetric ultrasonic thickness monitoring and automated eddy current diagnostic mapping. Hydrostatic testing validates leak-proof performance under pressure. Comprehensive mechanical testing includes tensile, flaring, flattening, and hardness verification.
Versatile Customization & Dimensional Flexibility
Our manufacturing capabilities support heavy utility boiler architectures. We accommodate high-schedule thicknesses up to SCH 160 or SCH XXS. Specialized end beveling configurations facilitate robust multi-pass field welding.
Custom length adjustments extend to 12 meters. Precision compound angles meet ASME B16.25 codes. Reinforced seaworthy steel cradle packaging protects your investment during global transit.
Critical Applications in Energy & Chemical Industries
Power Generation Infrastructure
TP347H tubing serves as the backbone material for ultra-supercritical coal-fired power plants. Superheater and reheater sections demand materials that resist creep deformation under steam temperatures exceeding 600°C.
Our tubes provide the required creep-rupture life for continuous 24/7 operation. Main steam headers, economizer circuits, and radiant heater networks rely on this material's thermal stability.
Petrochemical Refining Operations
Hydrocracker and hydrotreater units expose tubing to high-pressure hydrogen and sulfur compounds. The astm a213 tp347h tube resists sensitization-induced cracking in these aggressive environments.
Heat exchanger tubes in catalytic reforming units benefit from the stabilized grade's resistance to polythionic acid stress corrosion cracking. This protection ensures safe operation in volatile chemical processing.
Chemical Processing Systems
Large-scale reactor vessels handling high-temperature organic and inorganic acids require weld zone corrosion resistance. TP347H prevents corrosion in the heat-affected zones of welded assemblies.
Continuous acid chlorination processes and nitric acid production facilities depend on this material's ability to maintain integrity under thermal cycling and chemical attack.
Quality Assurance You Can Trust
Our four-step quality control process ensures every tube meets stringent international standards. Vendor audits verify raw material chemistry through spectrographic analysis. Production monitoring includes real-time dimensional inspection and heat treatment verification.
Independent testing encompasses eddy current, ultrasonic, hydrostatic, tensile, flattening, and flaring tests. Grain size verification confirms ASTM No. 7 or coarser requirement. Intergranular corrosion testing per ASTM A262 Practice E validates niobium stabilization effectiveness.
Final inspection includes complete documentation packages. EN 10204 3.1 Mill Test Certificates provide full material traceability. PMI reports verify alloy composition. Third-party inspection from SGS, TÜV, or BV is readily accommodated.
FAQ
Q：What distinct chemical stabilization prevents this product from grain boundary sensitization at high heats?
A:This tube has specific niobium (columbium) stabilisation with high carbon content optimised. Niobium generates stable carbides, therefore avoiding the loss of chromium at grain boundaries. This mechanism is very resistant to intergranular corrosion up to the heat extremes of 815°C when unstabilized grades would fail catastrophically.
Q：What precise volumetric inspection diagnostics are carried out on this specific pressure tube line?
A：Every tube undergoes mandatory 100% volumetric ultrasonic thickness scanning (UT) or automated online eddy current diagnostic mapping. This dual-method approach detects both internal laminations and surface discontinuities. Hydrostatic testing validates pressure integrity at 100% of specified fiber stress.
Q：What customized dimensional thickness thresholds can be engineered for severe industrial pressure networks?
A：We provide adaptable scheduling configurations up to extra-heavy wall boundaries. Standard offerings include SCH 40, 80, 120, 160, and XXS designations. Custom wall thicknesses accommodate your specific pressure and temperature calculations for superheater manifolds and reactor coils.
Q：Are customizable end treatments available to facilitate seamless automated field welding integration?
A：Yes, we support extensive custom fabrication options. Precision compound angle beveling meets ASME B16.25 codes. Burr-free cleaned ends and controlled squareness tolerances ensure consistent root pass penetration during automated orbital welding. Fixed random length structures extend up to 12 meters to minimize field joints.
Q：In what specific high-stress energy infrastructures is this niobium-stabilized tube universally deployed?
A：It is optimized for central station thermal power plants, main steam superheater headers, chemical process cracking units, and high-temperature radiant heater networks. Utility boilers, waste heat recovery systems, and nuclear auxiliary circuits also specify this grade for long-term creep resistance.
Contact Us
Ready to Specify TP347H for Your Next Project with the astm a213 tp347h tube? Contact us at info@hballtrust.com to discuss your specifications and receive a comprehensive quotation within 8 hours.
