astm a409 tp304 pipe
2. Standard: ASTM A409 / ASME SA409, standard specification for light-wall welded large-diameter piping
3. Process: Automated straight-seam or spiral-seam welding from calibrated plates, tailored for low-to-moderate pressure
4. Size Range: Large diameters from Nominal Pipe Size (NPS) 14" up to 30", featuring cost-effective light-wall profiles
5. Heat Treatment: Post-weld solution annealing or controlled furnace cooling based on specific corrosion service needs
6. Surface Finish: Solution annealed and pickled (SA&P), descaled industrial matte, or passivated clean finishes
7. Application: Pulp and paper mill pipelines, municipal water systems, organic chemical lines, and food factory drainage
8. Service Advantage: Hydrostatic pressure tested or non-destructive eddy current tested, full MTC 3.1 certification provided
9. Packaging: Secure ocean-freight bundle packing with protective end closures or bulk loaded with heavy nylon slings
10. Key Advantage: Combines massive volumetric fluid flow capacity with high economy, optimized for corrosive general service
ASTM A409 TP304 Pipe - Large Diameter Welded Stainless Steel Piping Solutions for High-Volume Corrosive Fluid Transport
Hebei All Trust Steel Co., Ltd manufactures premium astm a409 tp304 pipe using automatic longitudinal welding technology. Our light-wall pipe and big diameter pipe are available in the following sizes: 14" through 30" (355.6 mm–762 mm) with a wall thickness from SCH 5S to 10.0 mm. Each pipe is produced to stringent ASTM A409/ASME SA409 specifications, fully solution annealed and 100% eddy current tested. We can produce over 15,000 tons annually and have a rolling inventory of over 5,000 tons. We provide complete EN 10204 3.1 MTC certification and provide custom cut lengths from 5.8 m to 12 m to municipal water systems, pulp mills and chemical processing plants across the globe.
What Is ASTM A409 TP304 Pipe?
This device solves the industrial problem of moving large quantities of corrosive fluids at low to moderate pressures. This specification covers large diameter, light-wall, electric-fusion-welded austenitic chromium-nickel piping.
This welded construction is economical to produce at scales where seamless is prohibitive, as opposed to thick wall seamless. The TP304 grade has an ideal 18-8 chromium-nickel makeup with dependable oxidation resistance and top-notch weldability.
This plumbing solution is excellent when your large-bore diameter needs cannot be fulfilled with common standards like ASTM A312. The light wall profile minimises material cost while retaining structural integrity for common corrosive duty conditions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | ASTM A409 / ASME SA409 / ASTM A358 / EN 10217-7 |
| Product Type | Welded Large Diameter Stainless Steel Pipe |
| Material Grade | TP304 (UNS S30400 / 1.4301) |
| Manufacturing Process | Automatic Longitudinal Welding / TIG / Plasma |
| Outer Diameter (OD) | 14" – 30" (355.6 mm – 762 mm) |
| Wall Thickness (WT) | SCH 5S / SCH 10S / 2.0 mm – 10.0 mm |
| Length | 5.8 m / 6 m / 11.8 m / 12 m / Custom Cut |
| Surface Finish | Solution Annealed & Pickled / Mechanical Polished |
| End Type | Plain End (PE) / Beveled End (BE) / Flanged End |
| Testing | Radiographic / Hydrostatic / Eddy Current / Ultrasonic |
| Quality Certificates | EN 10204 3.1 & 3.2 MTC / ISO 9001:2015 |
| Third-Party Inspection | SGS / BV / TUV / DNV / ABS Accepted |
| Packaging | Wooden Cases / Plywood Crates / Waterproof Wrapping |
Core Material Properties
The product has a well regulated chemistry to generate a protective passive oxide layer. Carbon, 0.08% max; Chromium, 18.0% to 20.0%; Nickel, 8.0% to 11.0%;
This chemical balance yields a minimum tensile strength of 75 ksi (515 MPa) and a minimum yield strength of 30 ksi (205 MPa). You get excellent formability for large-bore fabrications and outstanding cryogenic toughness.
All pipe is solution annealed at a minimum of 1900°F (1040°C) and quench cooled rapidly. This heat treatment avoids carbide precipitation and provides for optimum grain structure. The result is a full relaxation of thermal stresses and stabilisation of the austenitic microstructure.
Manufacturing Excellence
Our production facility employs automatic straight-seam welding technology for consistent weld quality. Each product passes through chemical descaling pickle baths to optimize the passive layer defense.
Quality Verification Process
We implement mandatory weld seam validation through:
- Transverse guided-bend tests confirming ductility
- Flattening tests ensuring weld zone integrity
- Radiographic examination (RT) detecting porosity
- Positive Material Identification (PMI) verifying alloy content
- Dimensional inspections per ASTM A999 standards
Hydrostatic testing validates pressure containment capabilities at 100% inspection rate. Our precision cold-drawn processing achieves tolerance up to ±0.05 mm for critical applications.
Versatile Industrial Applications
Municipal Water Treatment
Large-diameter aeration systems and filtration piping networks rely on our corrosion-resistant construction. The light-wall profile reduces installation weight while maintaining structural integrity against moist environments and treatment chemicals.
Pulp and Paper Industry
Process liquor transport and bleaching chemical lines demand high-throughput capacity. Our astm a409 tp304 pipe handles corrosive slurries at low pressures, with customized wall profiles from SCH 5S supporting volumetric flow optimization.
Petrochemical Facilities
Low-pressure gas vent lines and vapor recovery systems benefit from thermal cycling resistance. The austenitic structure maintains stability under mildly acidic vapors, ensuring plant safety compliance.
Food Processing Plants
The surfaces of drainage system and of CIP (Clean-In-Place) circuits should be of hygienic quality. Our annealing and pickling finish is hygienic and resistant to organic acid corrosion.
Options for Customisation
You get personalised solutions that meet your project requirements:
Dimensional Customisation : Wall Thickness Selection from 2.0 mm up to 10.0 mm , Length Cutting up to 12 metres and Diameter Tolerance .
End Preparation: Precision edge beveling per ASME B16.25 for field butt-welding, companion flange weld-prep margins, and threaded connections.
Surface Treatment: 8K mirror polishing for pharmaceutical applications, satin finishing for architectural projects, and passivation treatment for enhanced corrosion resistance.
Special Processing: Laser hole drilling for manifold systems, slot cutting for screen applications, and pipe bending for complex routing.
Our flexible MOQ policy accommodates both small pilot projects and large-scale infrastructure installations.
Supply Chain Advantages
With strategic partnerships across 15+ qualified stainless steel mills, we maintain stable production capacity and competitive pricing. Our 5,000+ ton rolling inventory ensures immediate availability of standard sizes.
Delivery Performance
Stock orders ship within 3–5 days. Standard custom orders complete in 15–20 days. Large engineering projects deliver in 25–30 days, with priority scheduling reducing lead time by 35%.
You benefit from multi-mill backup systems that eliminate supply disruptions. Our procurement team handles mixed container loading of pipes, fittings, flanges, and valves for comprehensive project fulfillment.
Quality Documentation
Every shipment includes comprehensive certification packages:
- Original EN 10204 3.1 Mill Test Certificates with heat number traceability
- PMI analysis reports confirming chemical composition
- Mechanical test results from transverse tension and flattening tests
- Dimensional inspection records per ASTM A999
- Third-party inspection certificates from SGS, TUV, or Bureau Veritas
Our full material traceability system tracks each pipe from raw material verification through final shipment inspection.
Professional Packaging Solutions
Export packaging prevents surface damage during international transit:
- Individual protective sleeves guard against scratches
- Heavy-duty plywood crates resist impact loading
- Waterproof wrapping bags block moisture and salt corrosion
- Fumigation-free wooden cases meet international phytosanitary standards
- Steel cradles secure large-diameter pipes during ocean freight
Plastic end caps seal pipe openings against contamination. Steel strapping maintains bundle integrity throughout handling and shipping.
FAQ
Q：What distinct metallurgical properties enable this large-diameter product to endure general industrial exposure?
A：Formulated with standard austenitic chromium-nickel chemistry, this pipe provides robust mechanical load limits and trusted corrosion barriers across large-diameter, low-pressure process piping networks.
Q：What advanced heat treatment processes secure the microstructural uniformity of this pressure pipe line?
A：Crafted strictly to the parameters of the ASTM A409 code, it utilizes full solution annealing and descaling heat treatments inside program-controlled furnaces to release structural thermal stress completely.
Q：What destructive quality verification benchmarks must this astm a409 product line successfully pass?
A：Representative batch coupons are subjected to mechanical destructive flattening trials, cross-sectional flare expansions, and precise Rockwell or Brinell hardness monitoring to lock in compliant structural safety.
Q：Can this standard large-bore pipe series be customized with specialized end configurations for swift field connection?
A：Yes, we provide precision edge beveling angles matching ASME B16.25 codes for field butt-welding, customized long lengths up to 12 meters, and tailored companion flange weld-prep margins.
Q：Are your astm a409 tp304 piping lots approved by independent international auditing bodies?
A：Our entire pressure pipe line fully adheres to ISO 9001:2015 frameworks and welcomes independent witness inspections from certified third-party bureaus such as SGS, TUV, and Bureau Veritas (BV).
Contact Us
Ready to optimize your corrosive fluid transport infrastructure with the astm a409 tp304 pipe? Contact our engineering team at info@hballtrust.com for technical specifications, quotations, and customized solutions.
