astm a249 tp304 tube
2. Standard: ASTM A249 / ASME SA249, standard specification for welded boiler, superheater, heat-exchanger, and condenser tubes
3. Process: Automated longitudinal TIG or laser welding from premium steel strips, with cold working of the weld bead
4. Size Range: Outside Diameter from 1/8" to 5" (3.18mm to 127mm) with highly uniform and precise wall thickness profiles
5. Heat Treatment: Full solution annealing followed by rapid quenching to completely recrystallize and strengthen the weld zone
6. Surface Finish: High-purity bright annealed (BA) mirror finish, smooth acid-pickled, or precision mechanically polished
7. Application: Industrial boilers, steam superheaters, chemical heat exchangers, process condensers, and cooling coils
8. Service Advantage: 100% reverse flattening, flange, and hardness tested, with full mill test certificates (MTC 3.1) provided
9. Packaging: Hexagonal ocean bundles bound tightly with high-tensile steel straps or safely nested in solid plywood crates
10. Key Advantage: Combines exceptional dimensional concentricity with high heat-transfer efficiency, matching seamless tube performance
ASTM A249 TP304 Tube | Welded Heat Exchanger & Boiler Tubing | High-Performance Corrosion-Resistant Solution
HEBEI ALL TRUST STEEL CO., LTD specializes in manufacturing premium astm a249 tp304 tube engineered for demanding industrial heat transfer applications. Our austenitic stainless steel tubing is welded for better thermal conductivity and structural integrity in boiler systems, heat exchangers and condenser assemblies. We produce about 15,000 tons a year. All our tubes are 100% hydraulically tested. Our tubes are precisely made and have a composition of 18.0-20.0% chromium and 8.0-11.0% nickel. Each charge is strictly reverse flattened , flared and eddy current tested to assure zero defect performance in high pressure steam service to 870°C.
What Is ASTM A249 TP304 Tube?
The product is a welded austenitic stainless steel tube in accordance with ASTM A249/ASME SA249. It is an 18/8 grade stainless steel which has excellent corrosion resistance and is also economical to manufacture using automated TIG or laser welding techniques.
TP304 tube solves significant industrial difficulties. It does not oxidise at high temperatures in steam cycles. The weld seam that is cold-worked has the strength of the parent metal and does not lose its structural integrity. Smooth interior surfaces reduce fluid friction and scale buildup.
This tube is used in industries for heat management systems needing long term reliability. The austenitic structure remains stable against temperature variations. The loss of corrosion resistance during welding is restored by full solution annealing.
Technical Specifications & Parameters
| Specification | Details |
|---|---|
| Standard | ASTM A249 / ASME SA249 / EN 10217-7 |
| Material Grade | TP304 (UNS S30400 / 1.4301) |
| Manufacturing Process | Longitudinal TIG/Laser Welded + Cold Worked |
| Outer Diameter (OD) | 1/8" – 5" (3.18 mm – 127 mm) |
| Wall Thickness (WT) | 0.015" – 0.320" (0.38 mm – 8.13 mm) |
| Length Options | 5.8 m / 6 m / 11.8 m / 12 m / Custom Cut |
| Surface Finish | Bright Annealed (BA) / Pickled / Polished |
| Tensile Strength | ≥ 515 MPa (75 ksi) |
| Yield Strength | ≥ 205 MPa (30 ksi) |
| Testing Methods | Eddy Current / Hydrostatic / Flaring / Flattening / Reverse Flattening |
| Quality Certificates | EN 10204 3.1/3.2 MTC / ISO 9001:2015 |
| Packaging | Plywood Cases / Hexagonal Bundles / Waterproof Wrapping |
Core Advantages of Our ASTM A249 TP304 Tube
Extreme Thermal Performance
Our prodcut withstands continuous thermal cycling in steam superheaters and condensers. The solution-annealed structure absorbs thermal stress without grain boundary cracking. You gain reliable operation in temperatures reaching 870°C intermittent service.
Guaranteed Weld Integrity
Post-welding cold work treatment ensures weld seam strength matches parent material. We perform destructive flaring tests and reverse flattening checks on representative samples. Every production batch passes 100% eddy current testing for leak-proof assurance.
Precision Dimensional Control
Advanced cold drawing technology maintains wall thickness tolerance within ±0.05 mm. This dimensional accuracy ensures perfect fit in tube sheet assemblies. You avoid costly rework during heat exchanger fabrication.
Full Traceability & Certification
We provide full heat number tracking with each shipment of EN 10204 3.1 Mill Test Certificates. PMI results confirm chromium (18-20%) and nickel (8-11%) presence. Third party examination by SGS , TUV or BV is available on request .
Industrial Uses Power plants
These tubes may be used in surface condensers with high velocity cooling water. The austenitic structure is resistant to erosion and pitting corrosion. Heat transfer and resistance to thermal fatigue are better when the temperature fluctuates rapidly .
Chemical process equipment
Shell-and-tube heat exchangers for organic acids must be made of materials capable of withstanding cyclic loads. Our tubes retain their structural integrity when exposed to mildly corrosive substances. The inside is smooth, thereby preventing fouling in prolonged operation.
Food and Beverage Systems
The astm a249 tp304 tube is required for sanitary surfaces of pasteurizers and CIP (Clean-in-Place) heating systems. Bright annealed finish reduces bacterial growth sites. You get hygiene standards compliance while preserving heat transfer efficiency.
Quality Control Process
Material Verification Stage
We use superior steel strips from ISO certified mills with thorough chemical analysis. Spectrographic testing is carried out to determine chromium, nickel and carbon levels before manufacture. Heat numbers are recorded to provide complete material traceability.
Production Monitoring
Welding automation ensures constant penetration and bead shape. Real-time dimensional control of outer diameter and wall thickness during cold working. The parameters of the solution annealing are adjusted to guaranty full recrystallization.
Comprehensive Testing
Mandatory inspections include:
- Eddy current testing for 100% tube length
- Hydrostatic pressure testing per ASME standards
- Flaring and flattening tests on weld seam
- Hardness verification across weld zone
- Grain size determination per ASTM E112
Final Inspection & Documentation
Visual inspection confirms surface quality meets Ra roughness requirements. Packaging inspection prevents transit damage. You receive MTC documentation with tensile test results and chemical composition analysis.
FAQ
Q：What defines the extreme thermal stress absorption capacity of this product?
A：This tube is specifically tailored for extreme steam and pressure containment environments. The austenitic microstructure provides definitive metallurgical endurance. You gain reliable structural stability inside industrial boiler and superheater assemblies operating at high temperatures.
Q：Under what operating thresholds is it contractually optimal to select this automated welded tube?
A：It is optimized for standard commercial heat exchangers, condensers, and preheaters. You balance premium heat-conducting parameters with outstanding economic cost-effectiveness. The welded construction offers seamless tube performance at reduced procurement costs.
Q：What destructive mechanical deformation testing is performed to ensure the structural ductility of this tube?
A：Representative batch coupons undergo severe destructive mechanical flattening trials. We conduct cross-sectional flare expansions and precise reverse-flattening checks. Flange structural validation confirms weld seam ductility matches parent metal performance.
Q：Are custom wall thickness profiles supported for precision integration into high-heat frameworks?
A：Yes, we offer flexible manufacturing covering custom thin wall metrics. You receive tailored metric variations and precise outer diameter calibrations. Fractional specifications down to 0.015" wall thickness are available for specialized applications.
Q：What secure packaging protocols prevent internal corrosion or debris accumulation during long-distance transit?
A：Tubes are passivated and individually wrapped inside protective plastic sleeves. We arrange them carefully with soft foam separators. Reinforced seaworthy plywood crates secure bundles firmly for international shipping without surface damage.
Q：Is the weld seam a weak point in the product?
A：No, the A249 standard requires cold-working or heat treatment after welding. This process ensures weld strength and corrosion resistance match the parent metal. Our testing protocols verify consistent mechanical properties across the entire tube circumference.
Q：Can these tubes be used in high-pressure environments?
A：Yes, provided wall thickness calculations follow ASME Boiler and Pressure Vessel Code (BPVC) standards. You can specify thicker walls for elevated pressure ratings. Our engineering team assists with pressure vessel design compliance.
Contact Us
Ready to source certified astm a249 tp304 tube for your next project? Contact our technical team at info@hballtrust.com for quotations, material certifications, and custom sizing solutions.
