astm a358 tp304 pipe
2. Standard: ASTM A358 / ASME SA358, the definitive specification for electric-fusion-welded (EFW) heavy-duty piping
3. Process: Electric Fusion Welded (EFW) from calibrated plate, with automatic double-sided filler-metal straight seams
4. Size Range: Large scale sizes from Nominal Pipe Size (NPS) 8" up to 60" with thick industrial wall schedules
5. Heat Treatment: Full-body post-weld solution annealing above 1040°C to completely restore parent-metal strength to weld lines
6. Surface Finish: Clean solution annealed and pickled (SA&P), descaled industrial matte, or passivated clean profile
7. Application: Municipal water treatment mains, chemical distribution loops, cooling water lines, and oil refinery networks
8. Service Advantage: 100% X-ray radiographic inspection (RT) on welds per ASME Section VIII, third-party audits fully accepted
9. Packaging: Secure sea-freight bundle packing with protective end closures or bulk loaded with heavy steel dunnage frames
10. Key Advantage: Offers a highly reliable, cost-effective alternative to seamless pipes for massive volume fluid transmission
ASTM A358 TP304 Pipe – Large Diameter Welded Stainless Steel Piping Solutions for Industrial Fluid Systems
HEBEI ALL TRUST STEEL CO., LTD manufactures premium astm a358 tp304 pipe using advanced electric-fusion-welded (EFW) technology, offering robust piping solutions for high-volume industrial applications. Our plant has an annual production capacity of over 15,000 tons and a 100% hydraulic testing rate, manufacturing large-diameter pipes from 8" up to 60" with thick industrial wall specifications. All welds are 100% X-ray radiographed for complete joint fusion and our full-body post-weld solution anneal over 1040°C restores weld lines to parent-metal strength.
What is ASTM A358 TP304 Pipe?
The product is electric-fusion-welded austenitic chromium-nickel stainless steel pipe, intended only for large diameter industrial piping systems.
This pipe is made from calibrated steel plates rather than the seamless kind. The plates are manufactured to tight tolerances and connected utilising automated double sided filler metal welding processes.
The TP304 grade (UNS S30400) offers exceptional resistance to corrosion and mechanical stability. It is around 18 percent chromium and 8 percent nickel.
This material composition provides superior protection against oxidizing environments. It performs reliably in municipal water treatment, chemical processing, and petroleum refining systems.
The EFW manufacturing process enables cost-effective production of large-bore piping. Standard seamless pipes become economically unfeasible above certain diameters.
Full solution annealing after welding eliminates residual stresses. This thermal treatment ensures uniform metallurgical properties throughout the pipe body and weld zone.
Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | ASTM A358 / ASME SA358 / EN 10217-7 |
| Material Grade | TP304 (UNS S30400 / 1.4301) |
| Manufacturing Process | Electric-Fusion Welding (EFW) with Double Longitudinal Seam |
| Outer Diameter (OD) | 8" – 60" (219.1 mm – 1524 mm) |
| Wall Thickness | SCH 5S / SCH 10S / SCH 40S / SCH 80S (2.0 mm – 50 mm) |
| Length | 5.8 m / 6 m / 11.8 m / 12 m / Custom Cut Length |
| Heat Treatment | Solution Annealed (Above 1040°C) |
| Surface Finish | Solution Annealed & Pickled (SA&P) / As Welded / Passivated |
| End Type | Plain End (PE) / Beveled End (BE) / Flanged End |
| Testing | 100% Radiographic Test (RT) / Hydrostatic Test / Ultrasonic Test |
| Quality Certificates | EN 10204 3.1/3.2 MTC / ISO 9001:2015 |
| Third-Party Inspection | SGS / BV / TUV / DNV Accepted |
Key Advantages of Our ASTM A358 TP304 Pipe
Superior Weld Quality & Structural Integrity
Our astm a358 tp304 pipe is double longitudinal seams with automated filler-metal inserted. Each weld track is 100% radiographed (RT/X-ray) in accordance with ASME Section VIII regulations.
This essential inspection methodology ensures zero porosity, no inclusions in the weld and full structural equivalence of weld zones to the parent metal.
Post-weld solution annealing above 1040°C releases all internal micro-stresses. The result is uniform mechanical properties across the entire pipe length.
Cost-Effective Alternative to Seamless Pipe
Large-diameter seamless pipes become prohibitively expensive above 12 inches. Our EFW technology offers a practical and economical solution for massive volume fluid transmission.
You receive the same corrosion resistance and pressure containment capability. Manufacturing costs remain significantly lower than seamless alternatives.
This cost efficiency makes large-scale municipal and industrial projects financially viable.
Extensive Customization Capabilities
We customize across massive dimensional spectrums from 8" to 60" and beyond. Tailor-made edge beveling angles facilitate easier field assembly.
Custom wall thickness scheduling matches your specific pressure requirements. Fixed-length cutting eliminates field waste and reduces installation time.
Our engineering team provides CAD drawing verification and stress calculation support throughout your project planning phase.
Rigorous Quality Control Process
Every production batch follows our strict four-step quality management system:
- Raw Material Verification: Spectrographic analysis confirms chromium and nickel content meets TP304 standards.
- Production Monitoring: Real-time dimensional inspection ensures OD and wall thickness precision.
- Independent Testing: Transverse tension tests, guided-bend weld tests, and hardness testing verify mechanical properties.
- Final Inspection: Complete visual inspection, product marking verification, and MTC documentation before shipment.
Third-party inspection from SGS, TUV, or BV is fully accepted and welcomed.
Industrial Applications
Municipal Water Treatment Systems
Large diameter municipal water mains must have reliable corrosion resistance. ASTM A358 TP304 pipe offers long-term protection against chloride attack in potable water distribution networks.
Chemical Plants
TP304's austenitic structure is beneficial for lines handling organic acids, alkaline solutions and processing chemicals. It is resistant to intergranular corrosion in somewhat corrosive atmospheres.
Petroleum Refining Infrastructure
Cooling water systems, wastewater treatment loops, and non-corrosive hydrocarbon transport lines utilize this pipe's mechanical strength and dimensional stability.
Power Generation Facilities
Condensate systems, feedwater lines, and cooling tower piping demand high-integrity welded joints. Our 100% radiographic inspection meets the strictest power industry standards.
Packaging & Global Logistics
Our export packaging protects your investment during international transit:
- Heavy-duty plywood crates or steel framework cradles
- Waterproof fiber wrapping prevents moisture damage
- Plastic pipe end caps protect threading and beveled ends
- Steel strapping secures bundles against transportation impact
We ship from major Chinese ports including Shanghai, Ningbo, Tianjin, and Qingdao. FOB, CFR, CIF, and DDP terms are available.
Mixed container loading is supported for pipes, fittings, flanges, and valves to optimize your freight costs.
FAQ
Q：What defines the structural capability of this large-bore product in high-volume fluid networks?
A：This pipe utilizes advanced electric-fusion welding (EFW) technology to provide dependable structural load ratings and robust mechanical containment limits across high-capacity industrial fluid grids.
Q：What specialized welding technologies are integrated to ensure the joint seam can handle standard industrial variables?
A：Premium heavy steel plates are formed into tight tolerances and joined via automatic filler-metal added double longitudinal seams, backed by post-weld full solution annealing to release internal micro-stresses.
Q：What strict non-destructive criteria must the weld track clear prior to factory dispatch?
A：The entire length of the straight-seam weld joint is subjected to mandatory 100% radiographic examination (RT/X-ray) to guarantee absolute joint fusion and complete structural equivalence.
Q：What dimensional customization scales are available for massive chemical or municipal piping blueprints?
A：We highly customize across massive dimensional spectrums from 8 to 100 inches, supporting customized double-welded seam alignments and tailor-made edge beveling angles for field assembly.
Q：What robust packaging protocols protect this large-diameter pipe lot during long-distance maritime freight?
A：The pipes are secured on heavy steel frame cradles or sturdy plywood packing frames, wrapped entirely inside waterproof fiber sheets, and fitted with protective end caps.
Contact Us
Ready to discuss your large-diameter stainless steel piping requirements with the astm a358 tp304 pipe? Our engineering team responds within one hour during business hours. Contact us today at info@hballtrust.com for technical specifications and quotations.
