ASTM A213 TP347H Niobium-Stabilized Seamless Stainless Steel Heat Exchanger Tube for High-Temperature Service
ASTM A213 TP347H seamless stainless steel tubes are designed for high-temperature service in heat exchangers, boiler superheaters and industrial process equipment. TP347H is a niobium-stabilized austenitic stainless steel grade specified under ASTM A213/A213M.
The addition of niobium helps stabilize the steel against sensitization associated with chromium carbide precipitation. TP347H also has grade-specific requirements intended for high-temperature service, making it a material option for equipment exposed to elevated temperatures and sustained mechanical stress.
YUHONG can supply TP347H seamless tubes according to specified dimensions, material requirements and project inspection needs. Final suitability depends on the design temperature, pressure, process medium and applicable equipment code.
| Item | Description |
|---|---|
| Product Name | Seamless Stainless Steel Heat Exchanger Tube |
| Material Grade | ASTM A213 TP347H |
| UNS Designation | S34709 |
| Material Type | Niobium-Stabilized Austenitic Stainless Steel |
| Manufacturing Process | Seamless, Hot Finished or Cold Finished |
| Product Standard | ASTM A213/A213M |
| Outside Diameter | 6.35–127 mm (Common Reference Range) |
| Wall Thickness | 0.8–12.7 mm (Reference Range; Confirm Availability) |
| Length | Random or Fixed Length, Subject to Order |
| Heat Treatment | As Required by ASTM A213/A213M |
| Surface Condition | Annealed and Pickled, or Other Agreed Finish |
| Inspection Documents | Material Test Report and Inspection Records as Agreed |
The dimensional ranges above are indicative supply ranges, not a guarantee that every diameter and wall thickness combination is available. Final dimensions and applicable standard editions should be confirmed during quotation.
TP347H has grade-specific chemical and mechanical requirements for high-temperature applications. It may be considered for heat exchangers, superheaters and other equipment when the operating conditions are compatible with the material's design limits.
Niobium is added to stabilize the steel against sensitization-related effects associated with chromium carbide precipitation. This feature can be beneficial when the material experiences certain thermal cycles or welding-related conditions.
The seamless manufacturing process avoids a longitudinal weld seam in the tube body. Tube quality, dimensional tolerances and inspection requirements remain subject to ASTM A213/A213M and the purchase specification.
TP347H seamless tubes may be specified for heat-transfer equipment operating at elevated temperatures, subject to process conditions and engineering design requirements.
The grade is intended for high-temperature service and can be considered for suitable boiler superheater and reheater applications under the relevant design code.
TP347H may be used in selected process equipment where high-temperature strength and resistance to sensitization-related intergranular corrosion are important material-selection considerations. Actual corrosion resistance must be evaluated against the process medium and operating conditions.
The material can be considered for specified high-temperature tubing applications in refineries and power plants. Selection should be based on temperature, pressure, fluid chemistry, thermal cycling and applicable code requirements.
ASTM A213/A213M covers seamless ferritic and austenitic alloy-steel tubes for boiler, superheater and heat-exchanger service. The applicable edition and grade requirements should be stated in the purchase order.
Depending on the order, inspection may include:
- Chemical composition analysis
- Tensile and hardness testing
- Flattening and flaring tests, as applicable
- Hydrostatic testing or the specified nondestructive electric test
- Dimensional and visual inspection
- Material identification and traceability
Additional requirements, such as intergranular corrosion testing, positive material identification (PMI) or third-party inspection, should be confirmed before order placement.
Material documentation and inspection records can be arranged according to the agreed purchase specification. Typical documents may include:
- Material Test Certificate (MTC)
- Chemical and mechanical test results
- Dimensional inspection report
- Heat treatment records, where applicable
- Third-party inspection documentation, if agreed
EN 10204 3.1 documentation can be specified where required and available for the order. Company management-system certificates should be presented separately from product-specific inspection documents.
Seamless stainless steel tubes can be packed in export wooden cases or bundles with suitable end protection. Packaging is selected according to tube dimensions, surface finish, transportation method and destination requirements to help prevent handling damage and surface contamination.
Customized packing and marking can be discussed when confirming the order.
To request a quotation for ASTM A213 TP347H seamless tubes, please provide:
- Outside diameter and wall thickness
- Required tube length and quantity
- Applicable ASTM A213/A213M edition
- Surface finish and heat treatment requirements
- Inspection, testing and documentation requirements
- Delivery destination and preferred trade terms
MOQ, lead time, packaging and delivery terms will be confirmed according to the required specifications and order quantity.
TP347H is used in specified high-temperature tubing applications, including heat exchangers, boiler superheaters and reheaters, subject to the applicable design conditions.
TP347H has different chemical composition requirements, including a higher specified carbon range, and grade-specific requirements intended for high-temperature service. The correct grade should be selected according to the applicable standard and design conditions.
Niobium stabilization helps reduce susceptibility to sensitization-related intergranular corrosion under suitable conditions. Actual performance depends on material condition, thermal history and service environment. Additional corrosion testing may be required by the project specification.
A 3.1 inspection certificate can be requested where available and agreed for the order. Confirm documentation requirements when submitting the inquiry.
Please provide the required diameter, wall thickness, length, quantity, standard edition, inspection requirements and delivery destination for a specification review and quotation.
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