ASTM A213 TP347/347H Seamless Boiler & Heat Exchanger Tube | H Grade

Shaanxi Shangyou Stainless Steel Co., Ltd. supplies astm a213 tp347/347h seamless boiler & heat exchanger tube | h grade for buyers whose primary search intent is niobium-stabilized high-temperature exchanger and boiler tubing, not generic stainless or nickel-alloy stock. The page should be quoted against the selected standard edition, the equipment or component drawing and the governing design code. Niobium-stabilized seamless austenitic tube for boiler, superheater and heat-exchanger service, including H-grade high-temperature applications.

The material decision should start with service conditions. Cr-Ni stainless steel stabilized with niobium/tantalum. TP347H uses the H-grade chemistry and heat-treatment requirements for elevated-temperature design. Compare with TP321/321H: both are stabilized, but project specifications, service history, filler-metal practice and code allowables often determine the choice. This comparison belongs in the enquiry stage because a higher alloy name does not automatically deliver the lowest life-cycle risk.

A complete RFQ needs product form, grade/UNS, ordered condition, dimensional basis, tolerances, quantity and inspection level. State OD, wall basis, length, straightness, end finish and any tubesheet expansion tolerance. Quote only after a mill route review. For pressure-containing products, the material standard controls product quality; it does not replace pressure-design calculations, corrosion allowance or code approval.

Manufacturing and documentation must remain connected. Seamless hot- or cold-finished tube, heat treated and fully traceable by heat/lot. No substitution between 347 and 347H without written approval. The baseline verification plan is: ASTM mechanical and corrosion-related requirements as applicable, hydrostatic or NDE, optional eddy current/PMI and supplementary high-temperature controls by PO. Any supplementary requirement—PMI extent, UT class, eddy-current acceptance, corrosion testing, grain size, roughness, cleanliness or third-party inspection—must appear in the PO before production.

Fabrication guidance: Qualified procedures and matching filler are commonly used. Purge the ID, control heat input and specify post-weld cleaning for wetted surfaces. Selection boundary: TP347/347H is not automatically superior in aqueous chloride service. Select on temperature, corrosion environment, weld procedure and code allowables together. Buyers should provide fluid composition, maximum and minimum temperature, pressure, design life, fabrication route and applicable code so the quotation can separate mandatory requirements from optional controls.

Standards, Dimensions and Supply Definition

Material and Selection Markers

Use note: Values above are concise identification/selection markers, not a replacement for the ordered ASTM/AWS chemistry table or the MTC.

Candidate Applications

• Refinery heaters.
• High-temperature process exchangers.
• Superheater tubing.
• Equipment exposed to repeated welding or thermal cycling.

Buyer Decision Boundary

Compare with TP321/321H: both are stabilized, but project specifications, service history, filler-metal practice and code allowables often determine the choice.

Processing, Inspection and Documentation

• Manufacturing: Seamless hot- or cold-finished tube, heat treated and fully traceable by heat/lot. No substitution between 347 and 347H without written approval.
• Fabrication: Qualified procedures and matching filler are commonly used. Purge the ID, control heat input and specify post-weld cleaning for wetted surfaces.
• Inspection: ASTM mechanical and corrosion-related requirements as applicable, hydrostatic or NDE, optional eddy current/PMI and supplementary high-temperature controls by PO.
• Traceability: Keep heat/lot identity through cutting, machining, bending, welding, testing and packing.
• Documentation: Confirm MTC type, test reports, packing list, country-of-origin statement and third-party inspection before production.

RFQ Checklist

• Standard and adopted edition: ASTM A213/A213M
• Grade / UNS: TP347 / TP347H / S34700 / S34709
• Form and route: Seamless tube
• Dimensions, tolerances, quantity and unit basis
• Delivery/heat-treatment condition and surface/end finish
• Design code, service fluid/atmosphere, pressure and temperature
• Inspection/NDE, acceptance criteria, MTC and third-party witness points
• Marking, preservation, packing and delivery destination

Inquiry CTA

Frequently Asked Questions

1. What does ASTM A213/A213M cover for this product? Niobium-stabilized seamless austenitic tube for boiler, superheater and heat-exchanger service, including H-grade high-temperature applications. Always purchase to the edition adopted by the contract or project specification.

2. Is this product seamless, welded, forged, rolled or drawn? The PO must state the required route exactly: Seamless tube. Do not rely on a product photograph or a family name to establish the route.

3. How should buyers select TP347 / TP347H? Cr-Ni stainless steel stabilized with niobium/tantalum. TP347H uses the H-grade chemistry and heat-treatment requirements for elevated-temperature design. Compare with TP321/321H: both are stabilized, but project specifications, service history, filler-metal practice and code allowables often determine the choice.

4. Which dimensions must be included in the RFQ? State OD, wall basis, length, straightness, end finish and any tubesheet expansion tolerance. Quote only after a mill route review. Add quantity, unit basis, tolerances and any drawing-controlled geometry.

5. What heat-treatment or delivery condition is required? Grade-specific solution treatment; TP347H condition and any grain-size requirement must be matched to the design basis. The MTC and heat-treatment records should use the same grade and condition language as the PO.

6. Which inspection documents can be requested? ASTM mechanical and corrosion-related requirements as applicable, hydrostatic or NDE, optional eddy current/PMI and supplementary high-temperature controls by PO. The final inspection scope must be agreed before order placement.

7. Is it suitable for the intended corrosive or high-temperature service? TP347/347H is not automatically superior in aqueous chloride service. Select on temperature, corrosion environment, weld procedure and code allowables together. A material engineer should approve the final choice using actual service data.

8. What fabrication issues should be addressed? Qualified procedures and matching filler are commonly used. Purge the ID, control heat input and specify post-weld cleaning for wetted surfaces. Use a qualified procedure and preserve heat/lot traceability after cutting or fabrication.

9. What are typical applications? Common candidate applications include refinery heaters, high-temperature process exchangers, superheater tubing, equipment exposed to repeated welding or thermal cycling. These examples are not blanket design approvals.

10. What information is needed for a firm quotation? Send standard and edition, grade/UNS, form, dimensions, condition, quantity, delivery destination, inspection/NDE, documentation, packing and any third-party inspection or code requirement.