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ASTM A358 TP316L EFW Stainless Steel Pipe Class 1 Large Diameter Double-Welded for Corrosive 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 A358 TP316L EFW stainless steel pipe for global EPC contractors, offshore fabricators, chemical processors, and marine engineers requiring large-diameter, molybdenum-alloyed welded stainless piping with superior pitting and crevice corrosion resistance. Produced to ASTM A358/A358M, this specification covers electric-fusion-welded austenitic stainless steel pipe formed from plate or sheet with filler metal added during the welding process.
ASTM A358 is the standard specification for large-diameter EFW stainless steel pipe, covering sizes from NPS 8 to NPS 72+. Class 1 requires double welding with filler metal in all passes and 100% radiography, making it the standard for critical process piping in refineries, chemical plants, and marine environments. TP316L is the low-carbon molybdenum-bearing variant of 316 (C ≤ 0.030%, Mo 2.0-3.0%), which provides significantly improved pitting and crevice corrosion resistance in chloride-containing environments while preventing weld sensitization.
| Dimension | Specification |
|---|---|
| Product Name | ASTM A358 TP316L EFW Stainless Steel Pipe |
| Product Alias | 316L EFW Pipe / A358 Class 1 Pipe / Electric Fusion Welded Pipe / Marine Grade Stainless Pipe |
| Material Type | Austenitic Stainless Steel (EFW with Filler Metal, Low Carbon, Mo-Alloyed) |
| Key Feature | 2-3% Mo for pitting resistance; Class 1 double-welded with filler; 100% RT; NPS 8-72; low carbon prevents sensitization |
| Chemical Composition | Cr 16.0-18.0% / Ni 10.0-14.0% / Mo 2.0-3.0% / C ≤0.030% / Mn ≤2.0% / Si ≤1.0% / Fe Balance |
| Mechanical Properties | Tensile ≥485 MPa / Yield ≥170 MPa / Elongation ≥40% |
| Manufacturing Process | Plate Forming → EFW Double Welding with Filler (SAW/GTAW) → Solution Annealing (1040°C) + Water Quench → 100% RT → Hydrostatic Testing |
| Heat Treatment | Solution annealed at 1900°F (1040°C) + water quench or rapid cool |
| Primary Applications | Chemical Processing / Marine & Offshore / Seawater Systems / Petrochemical / Food & Beverage / Pharmaceutical |
| Parameter | Available Options |
|---|---|
| Product Standard | ASTM A358/A358M, ASME SA-358 |
| UNS Equivalent | UNS S31603 |
| Nominal Pipe Size (NPS) | NPS 8 to NPS 72+ (DN200 to DN1800+) |
| Wall Thickness | Schedule 5S, 10S, 40S, 80S per ASME B36.19; custom up to 60mm |
| Length | Single random, double random, or cut-to-length |
| Pipe End | Plain End (PE) / Beveled End (BE) |
| Class | Class 1 (Double-welded, 100% RT) / Class 3 (Single-welded, 100% RT) / Class 5 (Double-welded, spot RT) |
| Recommended Filler Metal | ER316L (AWS A5.9) |
| Inspection | 100% Radiography (Class 1) / Hydrostatic Test / Transverse Tension / Guided-Bend Weld Test / PMI |
| Documents | MTC 3.1 / Inspection Reports / Packing List / Heat Number Traceability |
ASTM A358 TP316L EFW pipe is specified for large-diameter piping systems requiring molybdenum-enhanced corrosion resistance in chloride-containing, marine, and chemical environments.
Typical applications include:
- Chemical and petrochemical process piping handling acids, sulfates, and chlorides
- Offshore platform topsides and subsea piping systems
- Seawater intake and brine systems in desalination plants
- Marine and coastal infrastructure
- Flue gas desulfurization (FGD) systems in power generation
- Pharmaceutical and food processing (hygienic, corrosion-resistant utility piping)
- Pulp and paper manufacturing equipment
- Urea and fertilizer plant piping
Key selection considerations: Choose TP316L over TP304L when the service environment contains chlorides, seawater, brine, or when higher pitting resistance is required—the 2-3% molybdenum addition provides significantly better resistance to pitting and crevice corrosion in chloride environments. Select Class 1 for critical process piping requiring the highest weld seam integrity—double-welded construction with 100% RT is standard for refineries and chemical plants. The low carbon content (≤0.030%) of TP316L eliminates sensitization risk during welding, making post-weld heat treatment unnecessary in most applications. All pipes are solution annealed at 1040°C and water quenched to ensure optimal corrosion resistance.
Shangyou Stainless Steel provides value-added processing including custom cutting, beveling, and end protection for large-diameter EFW pipes.
All pipes are packed with export-standard protection including protective end caps, steel strapping, waterproof wrapping, and steel frames or wooden pallets.
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 A358?
ASTM A358 is the standard specification for electric-fusion-welded austenitic stainless steel pipe for high-temperature and general corrosive service.
2. What is the difference between TP316 and TP316L in A358?
TP316 has max 0.08% carbon; TP316L has max 0.030% carbon. TP316L prevents sensitization during welding and does not require post-weld annealing.
3. What is the UNS number for TP316L?
UNS S31603.
4. What size range does ASTM A358 cover?
NPS 8 to NPS 72+ (DN200 to DN1800+).
5. What is the heat treatment for ASTM A358 TP316L?
Solution annealed at 1900°F (1040°C) + water quench or rapid cool.
6. What is the difference between ASTM A358 Class 1 and Class 3?
Class 1 is double-welded (weld from both ID and OD) with 100% RT; Class 3 is single-welded with 100% RT. Class 1 provides higher weld integrity.
7. Is filler metal required for Class 1?
Yes, Class 1 requires filler metal in all passes. Recommended filler metal is ER316L.
8. What documents are provided with delivery?
MTC 3.1, inspection reports, packing list, and heat number traceability.
9. What are typical applications for A358 TP316L pipe?
Chemical processing, offshore/marine, seawater systems, petrochemical, food & beverage, pharmaceutical, and FGD systems.
10. What is the recommended filler metal for 316L?
ER316L per AWS A5.9.
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Need ASTM A358 TP316L EFW stainless steel pipe Class 1 for large-diameter chemical, offshore, marine, or petrochemical service? Send requirements including grade, class, NPS/wall thickness/length, end finish, quantity, and service conditions.
Shangyou Stainless Steel provides custom sizes, processing, and export solutions for global B2B customers.
