ASTM A268 TP439 Ferritic Stainless Heat Exchanger Tube | S43035

Shaanxi Shangyou Stainless Steel Co., Ltd. supplies astm a268 tp439 ferritic stainless heat exchanger tube | s43035 for buyers whose primary search intent is cost-controlled ferritic corrosion-resistant 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. Stabilized ferritic stainless tube ordered to ASTM A268/A268M for general corrosion-resisting and elevated-temperature service.

The material decision should start with service conditions. Approximately 17% chromium ferritic stainless stabilized for weldability and resistance to intergranular attack. Compare with TP444 when molybdenum and higher localized-corrosion resistance are needed; compare with TP304L when formability and austenitic fabrication behavior dominate. 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. OD, wall, length, seamless/welded route and end use must be defined. Do not describe the product as seamless unless the PO and MTC confirm it. 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 or welded manufacture within A268 scope, followed by heat treatment, sizing and straightening. The selected route must appear on the quote and certificate. The baseline verification plan is: Standard tests, hydrostatic/NDE as applicable, optional eddy current, weld-seam inspection for welded supply, dimensional and surface checks. 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: Control heat input and shielding; ferritic grain growth and loss of ductility must be considered. Qualify expansion and bending for the selected wall and radius. Selection boundary: TP439 resists chloride stress-corrosion cracking better than common austenitic grades, but its pitting/crevice resistance is lower than TP444 or 316L in many chloride environments. 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

• Hot-water heat exchangers.
• Condensers in controlled media.
• Sugar and food processing equipment.
• Automotive and thermal-management tubing.

Buyer Decision Boundary

Compare with TP444 when molybdenum and higher localized-corrosion resistance are needed; compare with TP304L when formability and austenitic fabrication behavior dominate.

Processing, Inspection and Documentation

• Manufacturing: Seamless or welded manufacture within A268 scope, followed by heat treatment, sizing and straightening. The selected route must appear on the quote and certificate.
• Fabrication: Control heat input and shielding; ferritic grain growth and loss of ductility must be considered. Qualify expansion and bending for the selected wall and radius.
• Inspection: Standard tests, hydrostatic/NDE as applicable, optional eddy current, weld-seam inspection for welded supply, dimensional and surface checks.
• 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 A268/A268M
• Grade / UNS: TP439 / S43035
• Form and route: Ferritic seamless or welded tube; quote route explicitly
• 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 A268/A268M cover for this product? Stabilized ferritic stainless tube ordered to ASTM A268/A268M for general corrosion-resisting and elevated-temperature service. 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: Ferritic seamless or welded tube; quote route explicitly. Do not rely on a product photograph or a family name to establish the route.
3. How should buyers select TP439? Approximately 17% chromium ferritic stainless stabilized for weldability and resistance to intergranular attack. Compare with TP444 when molybdenum and higher localized-corrosion resistance are needed; compare with TP304L when formability and austenitic fabrication behavior dominate.
4. Which dimensions must be included in the RFQ? OD, wall, length, seamless/welded route and end use must be defined. Do not describe the product as seamless unless the PO and MTC confirm it. Add quantity, unit basis, tolerances and any drawing-controlled geometry.
5. What heat-treatment or delivery condition is required? Annealed condition to the ordered specification; fabrication trials may be needed for tight bending or severe expansion. The MTC and heat-treatment records should use the same grade and condition language as the PO.
6. Which inspection documents can be requested? Standard tests, hydrostatic/NDE as applicable, optional eddy current, weld-seam inspection for welded supply, dimensional and surface checks. The final inspection scope must be agreed before order placement.
7. Is it suitable for the intended corrosive or high-temperature service? TP439 resists chloride stress-corrosion cracking better than common austenitic grades, but its pitting/crevice resistance is lower than TP444 or 316L in many chloride environments. A material engineer should approve the final choice using actual service data.
8. What fabrication issues should be addressed? Control heat input and shielding; ferritic grain growth and loss of ductility must be considered. Qualify expansion and bending for the selected wall and radius. Use a qualified procedure and preserve heat/lot traceability after cutting or fabrication.
9. What are typical applications? Common candidate applications include hot-water heat exchangers, condensers in controlled media, sugar and food processing equipment, automotive and thermal-management tubing. 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.