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ASTM A409 Welded Large Diameter Stainless Steel Pipe TP304L/TP316L Light-Wall EFW for Corrosive and High-Temperature Service
| MOQ: | 5Ton |
| Price: | Based on grade, size, surface, processing, quantity and current raw material market price. |
| Standard Packaging: | Standard seaworthy export packing with bundles, waterproof wrapping, pallets or wooden cases. |
| Delivery Period: | 7-15 |
| Payment Method: | L/C,D/A,D/P,T/T,Western Union |
| Supply Capacity: | Stock supply, regular production and custom manufacturing available. |
Shaanxi Shangyou Stainless Steel Co., Ltd. supplies ASTM A409 welded large diameter stainless steel pipe for global EPC contractors, equipment manufacturers, and process plant owners requiring light-wall, large-bore austenitic piping for corrosive and high-temperature service. Produced to ASTM A409/A409M, this specification covers straight seam or spiral seam electric-fusion-welded, light-wall austenitic chromium-nickel alloy steel pipe.
ASTM A409 is the standard specification for large diameter light-wall welded stainless steel pipe, covering sizes from NPS 14 to NPS 30 (DN350 to DN750) with extra light (Schedule 5S) and light (Schedule 10S) wall thicknesses. Unlike ASTM A358, which permits filler metal addition during welding, ASTM A409 does not permit filler metal. The pipe is manufactured from plate or sheet by the electric fusion welding process and is intended for applications where corrosion resistance and high-temperature performance are required with reduced wall thickness. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of the specification.
| Dimension | Specification |
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Product Name
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ASTM A409 Welded Large Diameter Stainless Steel Pipe |
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Product Alias
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Large Diameter EFW Pipe / Light-Wall Stainless Pipe / A409 Welded Pipe / Spiral Seam Pipe / Straight Seam Pipe |
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Material Type
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Austenitic Stainless Steel (EFW, Light-Wall) |
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Key Feature
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Light-wall construction; large diameters NPS 14-30; Sch 5S/10S; no filler metal; suitable for corrosive and high-temperature service |
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Common Grades
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TP304, TP304L, TP316, TP316L, TP321, TP347, TP309S, TP310S |
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Chemical Composition (TP316L)
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Cr 16.0-18.0% / Ni 10.0-14.0% / Mo 2.0-3.0% / C ≤ 0.035% / Fe Balance |
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Mechanical Properties (TP316L)
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Tensile ≥485 MPa / Yield ≥170 MPa / Elongation ≥35% |
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Manufacturing Process
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Plate Forming → EFW Welding (Straight/Spiral Seam) → Sizing → Hydrostatic/NDE Testing |
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Surface Finish
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Annealed & Pickled / Bright Annealed / No.1 |
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Primary Applications
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Chemical Processing / Petrochemical Refining / Power Generation / Flue Gas Desulfurization / Boiler Systems / Environmental Protection Equipment |
| Parameter | Available Options |
|---|---|
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Product Standard
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ASTM A409/A409M |
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Grade Equivalents
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TP304 (UNS S30400), TP304L (UNS S30403), TP309S (UNS S30908), TP309Cb (UNS S30940), TP310S (UNS S31008), TP310Cb (UNS S31040), TP316 (UNS S31600), TP316L (UNS S31603), TP317 (UNS S31700), TP321 (UNS S32100), TP347 (UNS S34700), TP348 (UNS S34800) |
| Nominal Pipe Size (NPS) | NPS 14 to NPS 30 (DN350 to DN750) — pipe having other dimensions may be furnished provided it complies with all other requirements |
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Wall Thickness
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Schedule 5S (extra light) and Schedule 10S (light) per ASME B36.19; custom on request |
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Length
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Cut-to-length per order requirements |
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Pipe End
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Plain End (PE) / Beveled End (BE) |
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Inspection
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Hydrostatic Test / Nondestructive Electric Test / Tension Test / Transverse Guided-Bend Weld Test / PMI |
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Documents
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MTC 3.1 / Inspection Reports / Packing List / Heat Number Traceability |
ASTM A409 welded large diameter stainless steel pipe is specified for applications requiring light-wall, large-bore piping with corrosion resistance and high-temperature capability.
Typical applications include:
- Chemical and petrochemical process piping (large bore, light-wall)
- Boiler air preheater components and flue gas treatment equipment
- Power generation condenser and cooling water systems
- Flue gas desulfurization (FGD) systems transporting corrosive media
- Environmental protection equipment handling acidic condensates
- Heat exchanger piping in refinery and fertilizer production
- LNG plant cryogenic service (TP304L, TP316L)
Key selection considerations: ASTM A409 is specifically designed for light-wall, large-diameter applications where schedule wall thickness is reduced (Sch 5S, 10S). Choose TP304L for general corrosive service in low-chloride environments; TP316L when molybdenum is required for pitting resistance in chloride-containing service; TP321 or TP347 when stabilized grades are required for elevated temperature service. The light-wall construction of A409 makes it a cost-effective choice for applications where full schedule wall thickness is not required by pressure design. For heavier wall requirements in large diameter sizes, ASTM A358 may be more appropriate.
Shangyou Stainless Steel provides value-added processing including custom cutting, beveling, and end protection for large-diameter light-wall pipes.
All pipes are packed with export-standard protection including protective end caps, steel strapping, waterproof wrapping, and wooden pallets or steel frames. For large diameter pipes, nesting loading can be arranged to optimize container space.
Quality documents include MTC 3.1, inspection reports, packing list, and heat number traceability. Third-party inspection (SGS, TUV, BV) can be arranged upon request.
1. What is ASTM A409?
ASTM A409 is the standard specification for electric-fusion-welded, light-wall, large diameter austenitic stainless steel pipe for corrosive or high-temperature service.
2. What size range does ASTM A409 cover?
ASTM A409 covers NPS 14 to NPS 30 (DN350 to DN750) with Schedule 5S and 10S wall thicknesses.
3. What is the difference between ASTM A358 and ASTM A409?
ASTM A358 permits filler metal addition during welding; ASTM A409 does not permit filler metal. A409 is specifically for light-wall, large diameter pipe NPS 14-30 with Sch 5S/10S walls; A358 covers a broader size range and multiple classes.
4. What wall thicknesses are available under ASTM A409?
Schedule 5S (extra light) and Schedule 10S (light) are the standard wall thicknesses.
5. What grades are available under ASTM A409?
TP304, TP304L, TP309S, TP309Cb, TP310S, TP310Cb, TP316, TP316L, TP317, TP321, TP347, TP348, and others.
6. What welding processes are used for ASTM A409 pipe?
Straight seam or spiral seam electric-fusion-welded (EFW) process.
7. What is the difference between TP304L and TP316L in A409?
TP316L contains 2-3% molybdenum for improved pitting resistance in chloride environments; TP304L does not.
8. What testing is required for ASTM A409 pipe?
Hydrostatic test or nondestructive electric test, tension test, and transverse guided-bend weld test.
9. What documents are provided with delivery?
MTC 3.1, inspection reports, packing list, and heat number traceability.
10. What are typical applications for A409 pipe?
Chemical processing, petrochemical, power generation, flue gas desulfurization, boiler air preheater components, and environmental protection equipment.
Need ASTM A409 welded large diameter stainless steel pipe for light-wall, large-bore chemical processing or power generation piping? Send requirements including grade (TP304L/TP316L/TP321), NPS/wall thickness, length, end finish, quantity, and service conditions.
Shangyou Stainless Steel provides custom sizes, processing, and export solutions for global B2B customers.
