Shaanxi Shangyou Stainless Steel Co., Ltd.
| Key Feature | Double or single welded with filler metal; 100% RT (Class 1); large diameters NPS 8-60+; suitable for high-temperature and corrosive service |
| Manufacturing Process | Plate Forming → EFW Welding (SAW/GTAW/GMAW/PAW with Filler) → Sizing → Hydrostatic Test / Radiography |
| Common Grades | TP304, TP304L, TP316, TP316L, TP321, TP347, TP304H, TP316H |
| Mechanical Properties (TP316L) | Tensile ≥485 MPa / Yield ≥170 MPa / Elongation ≥35% |
| Payment Terms | L/C,D/A,D/P,T/T,Western Union |
| Product Alias | Electric Fusion Welded Pipe / EFW Stainless Pipe / A358 Welded Pipe / Large Diameter Stainless Pipe / SA358 Pipe |
| Class System | Class 1 (Double-welded, 100% RT) / Class 2 (Double-welded, no RT) / Class 3 (Single-welded, 100% RT) / Class 4 (Single-welded, inner pass no filler) / Class 5 (Double-welded, spot RT) |
| Material Type | Austenitic Stainless Steel (EFW Longitudinal Seam with Filler Metal) |
| Surface Finish | Annealed & Pickled / Bright Annealed / No.1 / No.4 / 2B / 8K Mirror Finish |
| Supply Ability | Stock supply, regular production and custom manufacturing available. |
| Packaging Details | Standard seaworthy export packing with bundles, waterproof wrapping, pallets or wooden cases. |
| Delivery Time | 7-15 |
| Product Name | ASTM A358 Stainless Steel EFW Pipe |
| Chemical Composition (TP316L) | Cr 16.0-18.0% / Ni 10.0-14.0% / Mo 2.0-3.0% / C ≤ 0.030% / Fe Balance |
| Certification | ISO9001 |
| Brand Name | Shangyou |
| Place of Origin | China |
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Product Specification
| Key Feature | Double or single welded with filler metal; 100% RT (Class 1); large diameters NPS 8-60+; suitable for high-temperature and corrosive service | Manufacturing Process | Plate Forming → EFW Welding (SAW/GTAW/GMAW/PAW with Filler) → Sizing → Hydrostatic Test / Radiography |
| Common Grades | TP304, TP304L, TP316, TP316L, TP321, TP347, TP304H, TP316H | Mechanical Properties (TP316L) | Tensile ≥485 MPa / Yield ≥170 MPa / Elongation ≥35% |
| Payment Terms | L/C,D/A,D/P,T/T,Western Union | Product Alias | Electric Fusion Welded Pipe / EFW Stainless Pipe / A358 Welded Pipe / Large Diameter Stainless Pipe / SA358 Pipe |
| Class System | Class 1 (Double-welded, 100% RT) / Class 2 (Double-welded, no RT) / Class 3 (Single-welded, 100% RT) / Class 4 (Single-welded, inner pass no filler) / Class 5 (Double-welded, spot RT) | Material Type | Austenitic Stainless Steel (EFW Longitudinal Seam with Filler Metal) |
| Surface Finish | Annealed & Pickled / Bright Annealed / No.1 / No.4 / 2B / 8K Mirror Finish | Supply Ability | Stock supply, regular production and custom manufacturing available. |
| Packaging Details | Standard seaworthy export packing with bundles, waterproof wrapping, pallets or wooden cases. | Delivery Time | 7-15 |
| Product Name | ASTM A358 Stainless Steel EFW Pipe | Chemical Composition (TP316L) | Cr 16.0-18.0% / Ni 10.0-14.0% / Mo 2.0-3.0% / C ≤ 0.030% / Fe Balance |
| Certification | ISO9001 | Brand Name | Shangyou |
| Place of Origin | China |
Shaanxi Shangyou Stainless Steel Co., Ltd. supplies ASTM A358 electric fusion welded (EFW) stainless steel pipe for global EPC contractors, equipment manufacturers, and process plant owners requiring large-diameter stainless piping for high-temperature and corrosive service. Produced to ASTM A358/A358M, this specification covers electric-fusion-welded austenitic chromium-nickel stainless steel pipe formed from plate or sheet, with filler metal added during the welding process using SAW, GTAW, GMAW, or PAW methods.
ASTM A358 is the standard specification for large-diameter welded stainless steel pipe, covering sizes from NPS 8 to NPS 60+ (DN200 to DN1500+). Unlike ASTM A312 welded pipe, which does not permit filler metal during welding and is typically produced from coil/skelp, ASTM A358 is manufactured from plate or sheet with filler metal addition to ensure complete weld penetration and soundness. The specification includes five classes (Class 1 through Class 5) that define the welding process and radiographic examination requirements. Class 1, requiring double welding with filler metal in all passes and 100% radiography, is the most common for critical process piping in refineries, chemical plants, and power generation facilities.
| Dimension | Specification |
|---|---|
| Product Name | ASTM A358 Stainless Steel EFW Pipe |
| Product Alias | Electric Fusion Welded Pipe / EFW Stainless Pipe / A358 Welded Pipe / Large Diameter Stainless Pipe / SA358 Pipe |
| Material Type | Austenitic Stainless Steel (EFW Longitudinal Seam with Filler Metal) |
| Key Feature | Double or single welded with filler metal; 100% RT (Class 1); large diameters NPS 8-60+; suitable for high-temperature and corrosive service |
| Common Grades | TP304, TP304L, TP316, TP316L, TP321, TP347, TP304H, TP316H |
| Class System | Class 1 (Double-welded, 100% RT) / Class 2 (Double-welded, no RT) / Class 3 (Single-welded, 100% RT) / Class 4 (Single-welded, inner pass no filler) / Class 5 (Double-welded, spot RT) |
| Chemical Composition (TP316L) | Cr 16.0-18.0% / Ni 10.0-14.0% / Mo 2.0-3.0% / C ≤ 0.030% / Fe Balance |
| Mechanical Properties (TP316L) | Tensile ≥485 MPa / Yield ≥170 MPa / Elongation ≥35% |
| Manufacturing Process | Plate Forming → EFW Welding (SAW/GTAW/GMAW/PAW with Filler) → Sizing → Hydrostatic Test / Radiography |
| Surface Finish | Annealed & Pickled / Bright Annealed / No.1 / No.4 / 2B / 8K Mirror Finish |
| Primary Applications | Chemical Processing / Petrochemical Refining / Power Generation / LNG Plants / Offshore Platforms / Fertilizer Plants |
| Parameter | Available Options |
|---|---|
| Product Standard | ASTM A358/A358M, ASME SA-358 |
| Grade Equivalents | TP304 (UNS S30400), TP304L (UNS S30403), TP304H (UNS S30409), TP316 (UNS S31600), TP316L (UNS S31603), TP321 (UNS S32100), TP347 (UNS S34700) |
| Nominal Pipe Size (NPS) | NPS 8 to NPS 60+ (DN200 to DN1500+) |
| Wall Thickness | Schedule 5S, 10S, 40S, 80S per ASME B36.19; custom thickness up to 30mm |
| Length | Single random, double random, or cut-to-length |
| Pipe End | Plain End (PE) / Beveled End (BE) / Threaded |
| Class Options | Class 1 (Double-welded, 100% RT) / Class 2 (Double-welded, no RT) / Class 3 (Single-welded, 100% RT) / Class 4 (Single-welded, inner pass no filler) / Class 5 (Double-welded, spot RT) |
| Inspection | Hydrostatic Test / 100% Radiography (Class 1 & 3) / Spot Radiography (Class 5) / PMI / Tension Test / Guided-Bend Weld Test |
| Documents | MTC 3.1 / Inspection Reports / Packing List / Heat Number Traceability |
ASTM A358 EFW stainless steel pipe is specified for large-diameter piping systems requiring high-temperature performance, corrosion resistance, and weld seam integrity in demanding environments.
Typical applications include:
Key selection considerations: Choose Class 1 (double-welded, 100% RT) for critical process piping in refineries, chemical plants, and power generation where weld seam integrity is paramount. Class 3 (single-welded, 100% RT) is suitable where single-pass welding with complete radiographic examination is acceptable. Class 5 (double-welded, spot RT) provides a cost-effective option for less critical service with reduced examination requirements. Select TP304L for general corrosive service with welded construction; TP316L when chlorides or more aggressive media are present as the 2-3% molybdenum addition provides superior pitting and crevice corrosion resistance; TP321 or TP347 for elevated temperature service above 800°F where stabilization is required.
Shangyou Stainless Steel provides value-added processing including custom beveling, cutting, threading, 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. For large diameter pipes, nesting loading can be arranged to optimize container space and reduce shipping costs.
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 (EFW) austenitic stainless steel pipe suitable for corrosive or high-temperature service, or both, or for general applications.
2. What is the difference between ASTM A312 and ASTM A358?
ASTM A312 covers seamless and straight-seam welded pipe made from coil/skelp without filler metal; ASTM A358 covers EFW pipe from plate (NPS 8 to 60+) with filler metal addition and a five-class quality system.
3. What are the ASTM A358 classes?
Class 1: Double-welded, 100% RT. Class 2: Double-welded, no RT. Class 3: Single-welded, 100% RT. Class 4: Single-welded, inner pass no filler. Class 5: Double-welded, spot RT.
4. Which ASTM A358 class is most common?
Class 1 (double-welded with 100% radiography) is the standard requirement for critical process piping in refineries and chemical plants.
5. What size range does ASTM A358 cover?
ASTM A358 covers NPS 8 to NPS 60+ (DN200 to DN1500+), making it suitable for large-diameter piping applications.
6. What welding processes are used for A358 EFW pipe?
SAW (Submerged Arc Welding), GTAW (TIG), GMAW (MIG), or PAW (Plasma Arc Welding), all with filler metal addition.
7. What is the difference between TP304L and TP316L in A358?
TP316L contains 2-3% molybdenum, providing superior chloride pitting resistance compared to TP304L. Both have low carbon (≤0.035%) for weld corrosion resistance.
8. What testing is required for ASTM A358 Class 1 pipe?
100% radiography of the weld seam, hydrostatic test, transverse tension test, and guided-bend weld test.
9. What documents are provided with delivery?
MTC 3.1, inspection reports, packing list, and heat number traceability. Third-party inspection reports available on request.
10. What are typical applications for A358 EFW pipe?
Chemical processing, petrochemical refining, power generation, LNG plants, offshore platforms, and flue gas desulfurization systems.
Request a Quote
Need ASTM A358 EFW stainless steel pipe for large-diameter chemical processing, petrochemical, or power generation piping? Send requirements including grade (TP304L/TP316L/TP321/TP347), class (1/3/5), NPS/WT/length, end finish, quantity, and service conditions.
Shangyou Stainless Steel provides custom sizes, processing, and export solutions for global B2B customers.
Company Details
Business Type:
Manufacturer
Year Established:
2022
Total Annual:
>$10 million
Employee Number:
>100
Ecer Certification：
Verified Supplier
About Us Shaanxi Shangyou Stainless Steel Co., Ltd. is a professional stainless steel manufacturer and global supplier specializing in the production and export of stainless steel pipes, sheets, coils, strips, bars, wires, profiles, and nickel alloy products. Our Expertise With exte... About Us Shaanxi Shangyou Stainless Steel Co., Ltd. is a professional stainless steel manufacturer and global supplier specializing in the production and export of stainless steel pipes, sheets, coils, strips, bars, wires, profiles, and nickel alloy products. Our Expertise With exte...
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