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ASTM A358 TP316L is a low-carbon, austenitic, arc-welded stainless steel pipe renowned for its exceptional corrosion resistance, high-temperature strength, and superior weldability. Its critical low carbon content (the "L" stands for low carbon) effectively reduces carbide precipitation during welding, significantly improving weldability and enhancing intergranular corrosion resistance in the weld area. This material is widely used in applications requiring the highest levels of hygiene and durability, including food and beverage processing, building structures, nuclear power facilities, boiler systems, and petroleum and petrochemical equipment. ASTM A358 TP316L CL1 further offers a wide range of pressure ratings (ranging from Class 10 to Class 160) to meet the pressure requirements of diverse operating conditions. Furthermore, low-carbon variants are available in both the 304 and 316 series, providing more flexible and reliable solutions for a wide range of industrial applications.
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What is ASTM A358 TP316 EFW Pipe?
ASTM A358 / ASME SA358 TP316 EFW Pipe is a high-integrity welded stainless steel pipe system designed for:
High-pressure industrial pipelines
Corrosive chemical media
Elevated temperature service (up to ~870°C intermittent)
Large diameter process systems
Unlike standard ERW pipes, A358 pipes are manufactured using electric fusion welding with strict radiographic inspection classes, making them suitable for critical engineering infrastructure.
Manufacturing Process (Engineering Level)
ASTM A358 TP316 pipes are produced using:
Plate / sheet forming
Longitudinal seam welding
Electric Fusion Welding (EFW)
Optional filler metal (depending on class)
Full or spot radiography (Class dependent)
Welding Processes Used:
SAW (Submerged Arc Welding)
GTAW (TIG)
GMAW (MIG)
PAW (Plasma Arc Welding)
👉 This ensures:
High weld integrity
Uniform wall thickness
Stable mechanical properties
ASTM A358 Pipe Classes (Critical Selection Factor)
| Class | Welding Type | Radiography | Application Level |
|---|---|---|---|
| Class 1 | Double welded + filler metal | 100% RT | Critical pressure systems |
| Class 2 | Double welded | No RT | General industrial |
| Class 3 | Single welded + filler metal | 100% RT | High integrity systems |
| Class 4 | Single weld (internal no filler) | No RT | Moderate service |
| Class 5 | Double welded | Spot RT | Balanced cost-performance |
👉 Class selection directly affects safety level and cost.
Key Advantages
✔ Superior corrosion resistance in chloride environments
✔ Large diameter manufacturing capability (EFW advantage)
✔ Cost-efficient alternative to seamless pipes
✔ Full radiographic inspection options (Class 1 & 3)
✔ High structural stability in pressure systems
✔ Custom engineering fabrication available
Products Description
| Specifications | ASTM A358 / A358M |
| Type | Welded Pipe |
| Out Diameter | 6NB to 1200NB |
| Standards | ASME |
| Wall Thickness | SCH.5, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160, XX, (3 mm to 100 mm Thickness) |
| Grades | ASTM A358 304, 304L, 310S, 316,316L,316H,317L,321,321H, 347, 347H, 904L |
| Outer diameter size | Electric Fusion Welded / EFW / ERW- 8" NB To 110" NB |
| A358 Pipe Classes (CL) | ASTM A358 CL1, CL2, CL3, CL4, CL5 |
| EFW Pipe End | Plain Ends / Beveled Ends |
| Specialized manufacturer of | ASME B36.10 ASTM A358 TP304 Class 2 Welded Pipe |
ASTM A358 Stainless Steel Pipe chemical composition
|
Material |
% Max ASTM A358 Chemical Composition |
||||||||||
| C | Mn | P | S | Si | Cr | Ni | Mo | N B | Nb | Ti | |
| A358 TP304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 | 8.0-11.0 | … | … | … | … |
| A358 TP304L | 0.035 D | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 | 8.0-13.0 | … | … | … | … |
| A358 TP316 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0-18.0 | 11.0-14.0 | 2.00-3.00 | … | … | … |
| A358 TP316L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | … | … | … |
| A358 TP316Ti | 0.08 | 2.00 | 0.045 | 0.030 | 0.75 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | 0.10 | … | 5x(C+N)-0.70 |
Nominal Wall Thickness of ASTM A358 TP316L
| NPS Designator | Outside Diameter | Nominal Wall Thickness | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| in. | mm | Schedule 5SA | Schedule 10SA | Schedule 40SA | Schedule 80SA | |||||
| in. | mm | in. | mm | in. | mm | in. | mm | |||
| 8 | 8.625 | 219.08 | 0.109 | 2.77 | 0.148 | 3.76 | 0.322 | 8.18 | 0.500 | 12.70 |
| 10 | 10.750 | 273.05 | 0.134 | 3.40 | 0.165 | 4.19 | 0.365 | 9.27 | 0.500B | 12.70B |
| 12 | 12.750 | 323.85 | 0.156 | 3.96 | 0.180 | 4.57 | 0.375B | 9.52B | 0.500B | 12.70B |
| 14 | 14.000 | 355.60 | 0.156 | 3.96 | 0.188B | 4.78B | ... | ... | ... | ... |
| 16 | 16.000 | 406.40 | 0.165 | 4.19 | 0.188B | 4.78B | ... | ... | ... | ... |
| 18 | 18.000 | 457.20 | 0.165 | 4.19 | 0.188B | 4.78B | ... | ... | ... | ... |
| 20 | 20.000 | 508.00 | 0.188 | 4.78 | 0.188B | 4.78B | ... | ... | ... | ... |
| 22 | 22.000 | 558.80 | 0.188 | 4.78 | 0.218B | 5.54B | ... | ... | ... | ... |
| 24 | 24.000 | 609.60 | 0.218 | 5.54 | 0.250 | 6.35 | ... | ... | ... | ... |
| 30 | 30.000 | 762.00 | 0.250 | 6.35 | 0.312 | 7.92 | ... | ... | ... | ... |
Weight of ASTM A358 TP316l Cl1 Welded Pipe
| Nominal | Outside | Nominal Wall Thickness (mm) | ||||||||
| Diameter | Diameter | ASME B36.19M | ASME B36.10M | |||||||
| NPS | (mm) | SCH5S | SCH10S | SCH40S | SCH80S | SCH5 | SCH10 | SCH20 | STD | XS |
| 1/4 | 13.72 | - | 1.65 | 2.24 | 3.02 | - | 1.65 | - | 2.24 | 3.02 |
| 3/8 | 17.15 | - | 1.65 | 2.31 | 3.2 | - | 1.65 | - | 2.31 | 3.2 |
| 1/2 | 21.34 | 1.65 | 2.11 | 2.77 | 3.73 | 1.65 | 2.11 | - | 2.77 | 3.73 |
| 3/4 | 26.67 | 1.65 | 2.11 | 2.87 | 3.91 | 1.65 | 2.11 | - | 2.87 | 3.91 |
| 1 | 33.4 | 1.65 | 2.77 | 3.38 | 4.55 | 1.65 | 2.77 | - | 3.38 | 4.55 |
| 1 1/4 | 42.16 | 1.65 | 2.77 | 3.56 | 4.85 | 1.65 | 2.77 | - | 3.56 | 4.85 |
| 1 1/2 | 48.26 | 1.65 | 2.77 | 3.68 | 5.08 | 1.65 | 2.77 | - | 3.68 | 5.08 |
| 2 | 60.33 | 1.65 | 2.77 | 3.91 | 5.54 | 1.65 | 2.77 | - | 3.91 | 5.54 |
| 2 1/2 | 73.03 | 2.11 | 3.05 | 5.16 | 7.01 | 2.11 | 3.05 | - | 5.16 | 7.01 |
| 3 | 88.9 | 2.11 | 3.05 | 5.49 | 7.62 | 2.11 | 3.05 | - | 5.49 | 7.62 |
| 3 1/2 | 101.6 | 2.11 | 3.05 | 5.74 | 8.08 | 2.11 | 3.05 | - | 5.74 | 8.08 |
| 4 | 114.3 | 2.11 | 3.05 | 6.02 | 8.56 | 2.11 | 3.05 | - | 6.02 | 8.56 |
| 5 | 141.3 | 2.77 | 3.4 | 6.55 | 9.53 | 2.77 | 3.4 | - | 6.55 | 9.53 |
| 6 | 168.28 | 2.77 | 3.4 | 7.11 | 10.97 | 2.77 | 3.4 | - | 7.11 | 10.97 |
| 8 | 219.08 | 2.77 | 3.76 | 8.18 | 12.7 | 2.77 | 3.76 | 6.35 | 8.18 | 12.7 |
| 10 | 273.05 | 3.4 | 4.19 | 9.27 | 12.7 | 3.4 | 4.19 | 6.35 | 9.27 | 12.7 |
| 12 | 323.85 | 3.96 | 4.57 | 9.53 | 12.7 | 3.96 | 4.57 | 6.35 | 9.53 | 12.7 |
| 14 | 355.6 | 3.96 | 4.78 | 9.53 | 12.7 | 3.96 | 6.35 | 7.92 | 9.53 | 12.7 |
| 16 | 406.4 | 4.19 | 4.78 | 9.53 | 12.7 | 4.19 | 6.35 | 7.92 | 9.53 | 12.7 |
| 18 | 457.2 | 4.19 | 4.78 | 9.53 | 12.7 | 4.19 | 6.35 | 7.92 | 9.53 | 12.7 |
| 20 | 508 | 4.78 | 5.54 | 9.53 | 12.7 | 4.78 | 6.35 | 9.53 | 9.53 | 12.7 |
| 22 | 558.8 | 4.78 | 5.54 | - | - | 4.78 | 6.35 | 9.53 | 9.53 | 12.7 |
| 24 | 609.6 | 5.54 | 6.35 | 9.53 | 12.7 | 5.54 | 6.35 | 9.53 | 9.53 | 12.7 |
| 26 | 660.4 | - | - | - | - | - | 7.92 | 12.7 | 9.53 | 12.7 |
| 28 | 711.2 | - | - | - | - | - | 7.92 | 12.7 | 9.53 | 12.7 |
| 30 | 762 | 6.35 | 7.92 | - | - | 6.35 | 7.92 | 12.7 | 9.53 | 12.7 |
| 32 | 812.8 | Thickness : 6.35~30mm | ||||||||
| | | | | |||||||||
| 84 | 2133.6 | |||||||||
| Remark | (1) Marking: Within production capability. Only manufacturer in India provided Mill Test Certificate | |||||||||
| (2) Other nominal diameter and wall thickness subject to the approval of vendor and purchaser. | ||||||||||
| (3) Calculating formula for the value of mass (kg/m):304/L[W=0.02491t(D-t)], 316/L[W=0.02507t(D-t) | ||||||||||
Application Engineering Fields
Oil & Gas
Offshore platforms
Refinery pipelines
LNG transport systems
Power Industry
Boiler systems
Heat exchanger piping
Chemical Processing
Acid transfer pipelines
Reactor feed lines
Chloride-rich environments
Marine Engineering
Seawater desalination systems
Offshore cooling systems
This product specification is aligned with:
ASTM A358 / ASME SA358 Standard Specification
ASME B36.19M Stainless Steel Pipe Dimensions
Outokumpu Stainless Steel Technical Handbook
Sandvik Materials Technology Corrosion Data Handbook
NACE MR0175 / ISO 15156 (sour service compatibility guidance)
"A358 TP316 EFW pipes are preferred in large-scale process industries where weld integrity inspection and diameter scalability are more critical than seamless microstructure uniformity."
Quality Assurance System
100% hydrostatic testing
Radiographic Testing (RT)
Ultrasonic Weld Inspection (UT)
PMI Testing (Positive Material Identification)
Third-party inspection (SGS / BV / TÜV optional)
EN 10204 3.1 / 3.2 certification
Inspection Flow Chart
Raw Material Verification
↓
Weld Integrity Testing (RT/UT)
↓
Dimensional Inspection
↓
Hydrostatic Pressure Test
↓
Surface & Visual Inspection
↓
Final Certification (MTC 3.1 / 3.2)
Packaging & Export Standard
Anti-rust coating protection
Plastic end caps
Steel bundling straps
Wooden crate (export grade)
ISO-compliant marking system
ASTM A358 TP316 EFW Pipe FAQ
Q1: What is ASTM A358 TP316 EFW pipe?
ASTM A358 TP316 EFW pipe is an electric fusion welded stainless steel pipe designed for high-temperature and corrosive service. It is manufactured from TP316 stainless steel plate and used mainly in large-diameter industrial piping systems such as oil & gas, chemical plants, and marine engineering.
Q2: What does EFW mean in stainless steel pipes?
EFW stands for Electric Fusion Welding. It is a process where the pipe seam is welded using electric arc fusion. This method provides strong weld integrity and is suitable for large-diameter and heavy-wall stainless steel pipes.
Q3: What is the difference between ASTM A358 and ASTM A312 pipes?
ASTM A358 pipes are:
Made from welded plate (EFW process)
Suitable for large diameter applications (up to 1200NB)
Available in different inspection classes (Class 1–5)
ASTM A312 pipes are:
Seamless or smaller welded pipes
Used for general pressure piping
Typically smaller diameter compared to A358
👉 A358 is preferred for large industrial pipeline systems.
Q4: What are ASTM A358 pipe Classes 1 to 5?
The class system defines welding and inspection level:
Class 1: Double welded + 100% radiographic testing
Class 2: Double welded, no RT
Class 3: Single welded + 100% RT
Class 4: Single welded, no RT
Class 5: Double welded + spot RT
👉 Higher class = higher inspection level and safety assurance.
Q5: Is TP316 suitable for high-temperature service?
Yes. TP316 stainless steel can typically withstand continuous service temperatures up to approximately 870°C (1598°F) depending on pressure conditions and system design.
Q6: What industries use ASTM A358 TP316 EFW pipes?
These pipes are widely used in:
Oil & gas pipelines
Chemical processing plants
Power generation systems
Marine and seawater applications
Heat exchanger and boiler systems
Q7: What is the advantage of TP316 over TP304 stainless steel?
TP316 contains molybdenum (Mo), which provides:
Higher resistance to chlorides
Better pitting corrosion resistance
Improved performance in marine environments
👉 TP316 is preferred for corrosive and seawater environments.
Q8: What sizes are available for ASTM A358 pipes?
Standard size range includes:
6NB to 1200NB (¼" to 48"+)
Wall thickness: SCH 5 to XXS
Length: 6 meters / 12 meters / custom
Q9: Can ASTM A358 pipes be used in seawater systems?
Yes. TP316 has strong resistance to chloride corrosion, making it suitable for seawater cooling systems, desalination plants, and offshore platforms.
Q10: What testing is required for ASTM A358 pipes?
Common inspection requirements include:
Hydrostatic pressure testing
Radiographic testing (RT) for Class 1 & 3
Ultrasonic testing (UT)
Positive Material Identification (PMI)
Visual and dimensional inspection
Q11: What is the difference between seamless and EFW stainless steel pipe?
Seamless pipe: No weld seam, used for smaller diameters and very high pressure
EFW pipe: Welded from plate, suitable for large diameter and cost-efficient industrial systems
Q12: What certificates are provided with ASTM A358 TP316 pipes?
Standard certification includes:
EN 10204 3.1 Mill Test Certificate (MTC)
Optional 3.2 third-party inspection certificate
Material traceability reports
NDT inspection reports
Q13: What is the main advantage of ASTM A358 pipes?
Key advantages include:
Large diameter production capability
Cost-effective compared to seamless pipes
High weld integrity with inspection classes
Suitable for high-pressure industrial systems
Q14: What is the delivery standard for ASTM A358 pipes?
Standard export packaging includes:
Plastic end caps
Anti-rust protection coating
Steel bundling
Wooden crate (optional for export safety)
Q15: Are ASTM A358 TP316 pipes customizable?
Yes. Pipes can be customized in:
Diameter and wall thickness
Length
Welding class (1–5)
Surface finish (pickled, polished, etc.)
Inspection requirements
Contact Us
Xi'an Dongmeng Group Co., Ltd
📞 Phone / WhatsApp / WeChat: +8615769214734
📧 Email: office@dongmjd.com
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