Stainless-steel alloy 904L grade is renowned for its resistance to aggressive, corrosive environments typical of industrial environments. Metinox Overseas exports the SS grade 904L welded pipes manufactured from prime materials through an advanced welding process (WNR: 1.4539, UNS: N08904). These pipes are meant to operate in harsh environments such as acid and high temperature as well as a chloride environment. The applications of the stainless-steel alloy 904L welded pipes are enormous in the chemical, petrochemical, oil, gas, power and marine sectors due to the high resistance of the alloy to pitting corrosion, crevice corrosion and stress corrosion cracks. They are also produced in broad diameter series, thickness, schedules, sizes and ends as per the requirements.
The grade of 904L is a high-performance austenitic alloy that is made with rich nickel, chromium, molybdneum and copper. This alloy makes it resistant to sulfuric and phosphoric acids and other inorganic acids. Besides being of high quality and performance attributes, Grade 904L is also characterized by high weldability, and it is unlikely to lose its mechanical strength due to its welding features. Our Stainless Steel 904L Welded Pipes at Metinox Overseas are subjected to thorough tests on different aspects, including chemical, physical, and corrosion resistance aspects.
Table of Contents
- Specifications of SS 904L Welded Pipe
- 904L Stainless Steel Pipe Chemical Composition
- ASME SA312 SS TP904L Pipe Mechanical Properties
- Stainless Steel UNS N08904 Pipe Equivalent Grades
- Stainless Steel 904L Pipes Physical Properties
- Schedule Chart Of WN 1.4539 Welded Pipe
- SUS 904L ERW Pipe Weight Chart
- Types of 904L Pipes Welded Available
- Manufacturing Process of SS 904L Welded Pipes
- Applications & Industry Uses of SS 904L Welded Pipes
- Frequently Asked Questions (FAQ)
Specifications of SS 904L Welded Pipe
| Parameter | Details |
| Specifications | ASTM B673 / ASME SA312 |
| Welded Pipes Size | 1/2" NB - 24" NB |
| Outside Diameter | 6.00 mm OD up to 914.4 mm OD, Sizes up to 24" NB available Ex-stock, OD size steel tubes available Ex-stock |
| Thickness Range | 0.3 mm - 50 mm, SCH 5, SCH 10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| Type | Welded |
| Form | Round Pipes, Square Pipes, Rectangular Pipes |
| Length | Single Random, Double Random & Required Length |
| End | Plain End, Beveled End, Threaded |
| Outside Finish | 2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Pipes, Finish as per customer requirements |
| Delivery Condition | Annealed and Pickled, Polished, Bright Annealed, Cold Drawn |
| EN 10216-5 | EN 10216 904L Welded Steel Pipe, EN 10216-5 1.4539 Welded Steel Pipes for pressure purposes |
| EN 10217-7 | EN 10217 904L Welded Steel Pipe, EN 10217-7 1.4539 Welded Pipes for pressure purposes |
904L Stainless Steel Pipe Chemical Composition
| Grade | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr (%) | Mo (%) | Ni (%) | Cu (%) |
| SS 904L | 0.020 max | 2.00 max | 1.00 max | 0.040 max | 0.030 max | 19.00 - 23.00 | 4.00 - 5.00 | 23.00 - 28.00 | 1.00 - 2.00 |
ASME SA312 SS TP904L Pipe Mechanical Properties
| Grade | Tensile Strength (min) | Yield Strength (0.2% Offset) (min) | Elongation (min) |
| SS 904L | 71,000psi / 490MPa | 32,000psi / 220MPa | 35% |
Stainless Steel UNS N08904 Pipe Equivalent Grades
| Standard | UNS | Werkstoff Nr. | AFNOR (FR) | EN Designation | JIS (JP) | BS (UK) | KS (KR) |
| SS 904L | N08904 | 1.4539 | Z2 NCDU 25-20 | X1NiCrMoCu25-20-5 | SUS 904L | 904S13 | STS 317J5L |
Stainless Steel 904L Pipes Physical Properties
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coeff. of Thermal Expansion (m/m/-C) 0-100-C | Thermal Conductivity (W/m-K) at 100-C | Specific Heat 0-100-C (J/kg-K) | Electrical Resistivity (n-m) |
| 904L | 8000 | 200 | 15.0 | 13.0 | 500 | 850 |
Schedule Chart Of WN 1.4539 Welded Pipe
| Nominal Pipe Size (IPS) | Outside Diameter (OD) | Available Schedules |
| 1/8? | 0.405? | 40, 80 |
| 1/4? | 0.540? | 10, 40, 80 |
| 3/8? | 0.675? | 10, 40, 80 |
| 1/2? | 0.840? | 5, 10, 40, 80, 160, XXH |
| 3/4? | 1.050? | 10, 40, 80, 160, XXH |
| 1? | 1.315? | 5, 10, 40, 80, 160, XXH |
| 1-1/4? | 1.660? | 10, 40, 80, 160, XXH |
| 1-1/2? | 1.900? | 10, 40, 80, 160, XXH |
| 2? | 2.375? | 10, 40, 80, 160, XXH |
| 2-1/2? | 2.875? | 10, 40, 80, 160, XXH |
| 3? | 3.500? | 5, 10, 40, 80, 160, XXH |
| 3-1/2? | 4.000? | 10, 40, 80, 160, XXH |
| 5? | 5.563? | 10, 40, 80, 160, XXH |
| 6? | 6.625? | 5, 10, 40, 80, 120, 160, XXH |
| 8? | 8.625? | 5, 10, 40, 80, 120, 160, XXH |
| 10? | 10.750? | 10, 20, 40, 80 (.500), TRUE 80 (.500) |
| 12? | 12.750? | 10, 20, 40 (.375), TRUE 40 (.406), 80 (.500) |
| 14? | 14.000? | 10 (.188), 40 (.375) |
| 16? | 16.000? | 10 (.188), 40 (.375) |
| 18? | 18.000? | 40 (.375) |
SUS 904L ERW Pipe Weight Chart
| NPS | OD (mm) | OD (in) | WT (mm) | WT (in) | Schedule | Weight (kg/Mtr) | Weight (Lb/ft) |
| 1/2 | 21.3 | 0.840 | 2.77 | 0.109 | SCH 40 | 1.27 | 0.85 |
| 1/2 | 21.3 | 0.840 | 3.73 | 0.147 | SCH 80 | 1.62 | 1.09 |
| 3/4 | 26.7 | 1.050 | 2.87 | 0.113 | SCH 40 | 1.69 | 1.13 |
| 3/4 | 26.7 | 1.050 | 3.91 | 0.154 | SCH 80 | 2.2 | 1.48 |
| 1 | 33.4 | 1.315 | 3.38 | 0.133 | SCH 40 | 2.5 | 1.68 |
| 1 | 33.4 | 1.315 | 4.55 | 0.179 | SCH 80 | 3.24 | 2.17 |
| 1 1/4 | 42.2 | 1.660 | 3.56 | 0.140 | SCH 40 | 3.39 | 2.28 |
| 1 1/4 | 42.2 | 1.660 | 4.85 | 0.191 | SCH 80 | 4.47 | 3 |
| 1 1/2 | 48.3 | 1.900 | 3.68 | 0.145 | SCH 40 | 4.05 | 2.72 |
| 1 1/2 | 48.3 | 1.900 | 5.08 | 0.200 | SCH 80 | 5.41 | 3.63 |
| 2 | 60.3 | 2.375 | 3.91 | 0.154 | SCH 40 | 5.44 | 3.65 |
| 2 | 60.3 | 2.375 | 5.54 | 0.218 | SCH 80 | 7.48 | 5.03 |
| 2 1/2 | 73 | 2.875 | 5.16 | 0.203 | SCH 40 | 8.63 | 5.8 |
| 2 1/2 | 73 | 2.875 | 7.01 | 0.276 | SCH 80 | 11.41 | 7.67 |
| 3 | 88.9 | 3.500 | 5.49 | 0.216 | SCH 40 | 11.29 | 7.58 |
| 3 | 88.9 | 3.500 | 7.62 | 0.300 | SCH 80 | 15.27 | 10.26 |
| 4 | 114.3 | 4.500 | 6.02 | 0.237 | SCH 40 | 16.07 | 10.8 |
| 4 | 114.3 | 4.500 | 8.56 | 0.337 | SCH 80 | 22.32 | 15 |
| 5 | 141.3 | 5.563 | 6.55 | 0.258 | SCH 40 | 21.77 | 14.63 |
| 5 | 141.3 | 5.563 | 9.53 | 0.375 | SCH 80 | 30.97 | 20.8 |
| 6 | 168.3 | 6.625 | 7.11 | 0.280 | SCH 40 | 28.26 | 18.99 |
| 6 | 168.3 | 6.625 | 10.97 | 0.432 | SCH 80 | 42.56 | 28.6 |
| 8 | 219.1 | 8.625 | 8.18 | 0.322 | SCH 40 | 42.55 | 28.59 |
| 8 | 219.1 | 8.625 | 12.7 | 0.500 | SCH 80 | 64.64 | 43.43 |
| 10 | 273.1 | 10.750 | 9.27 | 0.365 | SCH 40 | 60.31 | 40.52 |
| 10 | 273.1 | 10.750 | 12.7 | 0.500 | SCH 80 | 81.55 | 54.8 |
| 12 | 323.9 | 12.750 | 9.52 | 0.375 | SCH 40 | 73.88 | 49.65 |
| 12 | 323.9 | 12.750 | 12.7 | 0.500 | SCH 80 | 97.46 | 65.49 |
| 14 | 355.6 | 14.000 | 9.52 | 0.375 | SCH 40 | 81.33 | 54.65 |
| 16 | 406.4 | 16.000 | 9.52 | 0.375 | SCH 40 | 93.27 | 62.68 |
| 18 | 457.2 | 18.000 | 9.52 | 0.375 | SCH 40 | 105.21 | 70.71 |
| 20 | 508 | 20.000 | 9.52 | 0.375 | SCH 40 | 117.15 | 78.74 |
| 24 | 609.6 | 24.000 | 9.52 | 0.375 | SCH 40 | 141.03 | 94.8 |
| 30 | 762 | 30.000 | 9.52 | 0.375 | SCH 40 | 176.85 | 118.86 |
| 36 | 914.4 | 36.000 | 9.52 | 0.375 | SCH 40 | 212.66 | 142.92 |
| 42 | 1066.8 | 42.000 | 9.52 | 0.375 | SCH 40 | 248.48 | 166.97 |
| 48 | 1219.2 | 48.000 | 9.52 | 0.375 | SCH 40 | 284.3 | 191.03 |
Types of SS 904L Welded Pipes
We supply the widest range of super austenitic SS 904L welded pipes to meet critical industrial needs. Below are the types and images of pipes we offer:
Stainless Steel 904L Seamless Pipe
SS UNS N08904 Flex Pipe
SS 904L Welded Pipe
ASTM B677 UNS N08904 Square Pipe
ASTM A312 TP904L Exhaust Pipe
904L Stainless Steel Clad Pipe
Manufacturing Process of SS 904L Welded Pipes
Forming and Welding: SS 904L welded pipes are manufactured by first forming steel strips or plates into a cylindrical shape. The edges are then joined using either TIG (Tungsten Inert Gas) or laser welding techniques. These welding methods ensure a strong, uniform weld seam while preserving the corrosion-resistant qualities of the material.
Heat Treatment and Annealing: After welding, the pipes undergo a solution annealing process. This involves heating them to a specific temperature to dissolve any secondary phases and restore the alloy's full corrosion resistance, especially against chloride-induced pitting and stress corrosion cracking.
Completion and Quality Checking: Post-annealing, the pipes are pickled and passivated to remove surface scale and enhance the passive oxide layer. Strict dimensional and non-destructive testing (NDT) is performed to ensure compliance with ASTM B673, ASME SA312, and customer-specific requirements.
Applications of SS 904L Welded Pipes
Chemical and Petrochemical: SS 904L welded pipes are highly preferred in chemical and petrochemical industries for handling aggressive chemicals such as sulfuric acid, phosphoric acid, and chlorides. Their superior resistance to pitting and crevice corrosion makes them ideal for processing vessels, reactors, and piping in acid plants.
Oil and Gas Industry: In the oil and gas sector, these pipes are used in offshore platforms, sour gas handling, and environments with high chloride content and elevated temperatures. Their durability and resistance to stress corrosion cracking make them reliable for critical applications in harsh conditions.
Power Generation and Heat Exchangers: Power plants and heat exchanger systems use SS 904L welded pipes due to their ability to withstand high temperatures and corrosive fluids. They ensure efficient thermal conductivity while maintaining structural integrity, making them suitable for condensers and cooling systems.
Marine and Industrial Applications: Thanks to their excellent seawater resistance, SS 904L welded pipes are widely used in marine engineering, desalination plants, and coastal infrastructure. They are also employed in pharmaceutical manufacturing, pulp and paper processing, and food-grade piping systems where hygiene and corrosion resistance are paramount.
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Frequently Asked Questions (FAQ)
SS 904L welded pipe is a super austenitic stainless steel pipe manufactured by welding flat strips or coils into a cylindrical shape. It is known for its exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking, making it suitable for highly aggressive environments.
SS 904L welded pipes are available in sizes ranging from 1/8" to 48" NPS. Common schedules include SCH 5S, SCH 10S, SCH 40S, SCH 80S, and SCH 160. Custom dimensions can also be supplied based on project requirements.
Yes. SS 904L offers excellent corrosion resistance, especially against sulfuric acid, phosphoric acid, chlorides, and seawater. Its high molybdenum and copper content significantly enhances its performance in harsh chemical environments.
SS 904L welded pipes can withstand moderately elevated temperatures up to 450-C (842-F) in continuous service. However, for extremely high-temperature applications, other alloys like Inconel may be more appropriate. Pressure ratings depend on size, schedule, and wall thickness.
The price of SS 904L welded pipes varies based on size, schedule, quantity, and market conditions. Please contact Metinox Overseas for the latest price list and competitive quotes tailored to your project.
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