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ASTM A249 TP304 stainless steel tube is a welded austenitic stainless steel heat exchanger tube designed for pressure-bearing, thermal exchange, and corrosion-controlled environments.
It is manufactured in accordance with ASTM A249 / ASME SA249, which specifically governs welded tubes used in:
Heat exchangers
Boilers
Condensers
Superheater systems
Industrial fluid heat transfer equipment
From an engineering perspective, TP304 is considered the baseline austenitic grade for general industrial heat exchange systems, offering a balanced combination of corrosion resistance, mechanical strength, and fabrication stability.
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ASTM A249 Standard Interpretation
ASTM A249 is not a material standard alone - it is a manufacturing and acceptance standard for welded stainless steel tubing used in pressure and heat transfer systems.
The standard defines:
✔ Tube forming and welding method
✔ Heat treatment requirement (solution annealing)
✔ Dimensional tolerance control
✔ Mechanical property verification
✔ Non-destructive testing (NDT) requirements
Mandatory testing includes:
Hydrostatic test (pressure integrity)
Eddy current test (surface defect detection)
Flattening / flange test (weld ductility validation)
👉 This ensures every TP304 tube is suitable for continuous thermal cycling and pressure fluctuation environments.
Corrosion Performance
TP304 performs well in:
✔ Fresh water systems
✔ Steam and condensate systems
✔ Mild acidic environments
✔ Organic chemical media
✔ Atmospheric corrosion conditions
Limitations (engineering honesty)
Not suitable for high chloride seawater without alloy upgrade (TP316 preferred)
Pitting corrosion risk in high-salt environments
Not recommended for strong reducing acids
ASME SA249 Stainless Steel Tubing Specification
ASTM A249 TP201
ASTM A249 TP202
ASTM A249 TP304
ASTM A249 TP304L
ASTM A249 TP309
ASTM A249 TP310
ASTM A249 TP316
ASTM A249 TP321
ASTM A249 TP347
ASTM A249 TP348
| ASTM A249 TP304 Standard Specification | Stainless Steel Welded Superheater, Condenser, Hydraulic, Boiler and Heat-Exchanger Tubes |
| Manufacturing Type | ERW / Welded / Fabricated / CDW / DOM / CEW / 100% X Ray Welded |
| Delivery Condition | Annealed and Pickled (AP), Polished, Bright Annealed (BA), Cold Drawn, MF |
| Surface Finish | BA, 2B, No.4, No.1, No.3, No.8, 8K, HL, 2D, 1D, Mirror Polished, 180G, 320G, 400G Satin/ Hairline, 400G, 500G, 600G or 800G Mirror finish ASME SA249 Standard Tubing or Custom Finish as per customer's specification |
| Outside Diameter (OD) | 6 to 304.8 mm |
| Wall Thickness Range | 0.5 to 6 mm |
| Standard | SUS, JIS, AISI, ASTM, GB, DIN, EN |
| Value Added Services |
Cutting Beveling Threading Polishing (Electro & Commercial) Draw & Expansion as per required Size & Length Destructive and Non Destructive Ultrasonic Testing Annealed & Pickled Bending |
| Processing Service | Bending, Welding, Decoiling, Punching, Cutting, Moulding |
| Technique | ASTM A249 Welded Austenitic Steel Cold drawn, Cold rolled, Hot rolled, Extrusion Tube |
| Tolerance |
Outer Diameter: +/- 0.2mm Thickness: +/- 10% OR as customer request Length: +/- 10mm |
| Test Certificate |
DFARS compliant EN 10204/3.1B, EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC) 100% Radiography Test Report Raw Materials Certificate Third Party Inspection Report Fumigation Certificates Heat Treatment Charts HS Code Commercial Invoice Form A for Generalized System of Preferences (GSP) Manufacturer Test Certificate Moisture testing Surface roughness measurement Laboratory Test Certificate from Govt. Approved Lab |
| ASME SA 249 TP 304 Tubing Packaging | Packed in PE Fabric Bundles or ply wooden box wrapped in plastic or Standard seaworthy export packing or as per customers' request |
| Port | Qingdao |
| Uses & Application |
Common industrial services (Petroleum, chemical, paper, fertilizer, fabric, aviation and nuclear) Fluid, gas and oil industry Heat transmission and pressure service Construction and ornamental Boilers and Heat exchangers system Decoration purpose, boiler, auto parts, medical device, food industry, building materials) |
ASTM A249 Welded Austenitic Steel Tubing Mechanical Properties
ASME SA 249 Tube Chemical Composition
ASTM A249 Welded Stainless Steel Tubing Inventory
| Outside Diameter (OD) - mm | 12.7, 15.88, 19.05, 25.4, 31.8, 38.1, 45, 50.8, 60.3, 76.2 |
|---|---|
| Wall Thickness (WT) - mm | 0.51, 0.71, 0.89, 1.0, 1.25, 1.65, 2.11, 2.77, 3.05 . |
ASTM A249 TP304 tubes are widely applied in
Thermal Systems
Shell & tube heat exchangers
Plate heat exchanger reinforcement tubes
Industrial cooling systems
Energy Systems
Boiler heat transfer tubes
Power plant condensers
Waste heat recovery systems
Process Industries
Petrochemical heat exchange units
Food-grade heating systems
Pharmaceutical sterile fluid systems
Engineering Advantages
From a design engineer's perspective:
✔ Stable weld structure under cyclic thermal stress
✔ Excellent manufacturability (bending, expansion, welding)
✔ Predictable corrosion behavior
✔ Cost-efficient compared to alloy grades
✔ Global standard acceptance (ASTM / ASME compliance)
Quality Assurance System
Each batch undergoes a full QA chain:
Internal QA:
Raw material spectrochemical analysis
Welding parameter monitoring
Full dimensional inspection
External Verification:
Third-party inspection (SGS / BV / TUV available)
Mill Test Certificate (EN 10204 3.1 / 3.2 optional)
👉 This ensures traceability from raw steel coil → finished tube → shipment batch.
FAQ
Q1: What is ASTM A249 used for in engineering systems?
It defines welded stainless steel tubes used in heat transfer and pressure applications such as boilers and heat exchangers.
Q2: Is TP304 suitable for high-pressure systems?
Yes, within standard design limits, TP304 is suitable for moderate to high pressure heat transfer systems.
Q3: Why is TP304 widely used in heat exchangers?
Because it offers stable corrosion resistance, good thermal conductivity, and excellent weld integrity.
Q4: What is the difference between ASTM A249 and A213?
A249 is for welded tubes, while A213 covers seamless tubes.
Q5: Can TP304 tubes be customized?
Yes, diameter, wall thickness, and length can be customized according to project requirements.
Engineering Summary
ASTM A249 TP304 stainless steel tube is the standard industrial solution for welded heat exchanger tubing systems, combining:
Stable metallurgical structure
Reliable weld performance
Cost-effective material selection
Global engineering acceptance
It is the most widely specified stainless steel tube grade in general industrial thermal systems worldwide.
Contact Us Technical & Commercial Support
For technical specification confirmation, quotation, sample request, or project-based procurement support, our engineering and sales team is available for fast response.
We support global clients in heat exchanger, boiler, petrochemical, and industrial piping projects.
📍 Company Information
Xi'an Dongmeng Group Co., Ltd.
📞 Contact Details
WhatsApp / WeChat: +8615769214734
Email: office@dongmjd.com
🧭 Business Support Scope
ASTM / ASME material selection guidance
Technical datasheet confirmation
Project quotation (RFQ within 24h)
Mill Test Certificate (MTC) support
Third-party inspection arrangement (SGS / BV / TUV)
Export documentation support
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