Shanxi Zhongcheng Metal Co., Ltd.
| Delivery Time | 7-15 days for stock sizes, 20-30 days for custom production |
| Standard | ASTM A312, ASME SA312, EN 10216-5 |
| Length | 6 Meters (standard), custom lengths available |
| Yield Strength (0.2%) | ≥ 220 MPa |
| Chemical Composition | Cr 19.0-23.0%, Ni 23.0-28.0%, Mo 4.0-5.0%, Cu 1.0-2.0% |
| Inspection | Eddy Current Testing, Hydrostatic Testing, PMI, MTC EN 10204 3.1 |
| Surface Finish | Annealed & Pickled (AP), Bright Annealed (BA) |
| Tensile Strength | ≥ 490 MPa |
| Application | Sulfuric acid processing, chemical plants, fertilizer production |
| Payment Terms | T/T,L/C at sight |
| Outer Diameter (OD) | 21.3mm - 219.1mm (1/2" - 8" NB) |
| Wall Thickness (WT) | SCH 10S / 40S / 80S / 160S |
| Material Grade | 904L / UNS N08904 / EN 1.4539 |
| Supply Ability | 500 Tons per Month |
| Packaging Details | Plastic end caps, bundled with steel straps, water-proof woven bag wrapping, export-grade plywood case or pallet |
| Elongation | ≥ 35% |
| Model Number | 904L-SMLS-A312 |
| Brand Name | WNRLN |
| Certification | ISO 9001:2015, PED 2014/68/EU, MTC EN 10204 3.1 |
| Place of Origin | Jiangsu, China |
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Product Specification
| Delivery Time | 7-15 days for stock sizes, 20-30 days for custom production | Standard | ASTM A312, ASME SA312, EN 10216-5 |
| Length | 6 Meters (standard), custom lengths available | Yield Strength (0.2%) | ≥ 220 MPa |
| Chemical Composition | Cr 19.0-23.0%, Ni 23.0-28.0%, Mo 4.0-5.0%, Cu 1.0-2.0% | Inspection | Eddy Current Testing, Hydrostatic Testing, PMI, MTC EN 10204 3.1 |
| Surface Finish | Annealed & Pickled (AP), Bright Annealed (BA) | Tensile Strength | ≥ 490 MPa |
| Application | Sulfuric acid processing, chemical plants, fertilizer production | Payment Terms | T/T,L/C at sight |
| Outer Diameter (OD) | 21.3mm - 219.1mm (1/2" - 8" NB) | Wall Thickness (WT) | SCH 10S / 40S / 80S / 160S |
| Material Grade | 904L / UNS N08904 / EN 1.4539 | Supply Ability | 500 Tons per Month |
| Packaging Details | Plastic end caps, bundled with steel straps, water-proof woven bag wrapping, export-grade plywood case or pallet | Elongation | ≥ 35% |
| Model Number | 904L-SMLS-A312 | Brand Name | WNRLN |
| Certification | ISO 9001:2015, PED 2014/68/EU, MTC EN 10204 3.1 | Place of Origin | Jiangsu, China |
| High Light | UNS N08904 904L stainless steel pipe ，ASTM A312 sulfuric acid resistant pipe ，Super austenitic seamless pipe Schedule 40S | ||
The UNS N08904 904L seamless pipe represents the pinnacle of super austenitic stainless steel engineering for extreme chemical environments. With a molybdenum content of 4.0-5.0%, nickel content exceeding 23%, and copper additions of 1.0-2.0%, this alloy delivers exceptional resistance to sulfuric acid, phosphoric acid, and chloride-induced stress corrosion cracking — capabilities that standard 316L and even many duplex grades cannot match.
The 904L grade (EN 1.4539) is classified as a fully austenitic super stainless steel with low carbon content (≤0.02%), which virtually eliminates intergranular carbide precipitation during welding. The high nickel content stabilizes the austenitic structure, while molybdenum and copper work synergistically to enhance resistance to reducing acids. This metallurgical profile makes 904L seamless pipes the preferred choice for critical chemical processing applications where material failure is not an option.
| Element | Content (%) | Role in Performance |
|---|---|---|
| Chromium (Cr) | 19.0 - 23.0 | Forms passive oxide layer, provides baseline corrosion resistance |
| Nickel (Ni) | 23.0 - 28.0 | Stabilizes austenite, enhances resistance to stress corrosion cracking |
| Molybdenum (Mo) | 4.0 - 5.0 | Critical for pitting and crevice corrosion resistance in chloride environments |
| Copper (Cu) | 1.0 - 2.0 | Improves resistance to reducing acids, particularly sulfuric acid |
| Carbon (C) | ≤ 0.02 | Ultra-low carbon prevents sensitization during welding |
Every 904L seamless pipe is produced through a rigorous hot extrusion or cold pilgering process followed by solution annealing at 1070-1150°C and rapid water quenching. This ensures a fully recrystallized, homogeneous austenitic microstructure free of secondary phases. In-line eddy current testing (ECT) per ASTM E426 and hydrostatic testing per ASTM A999 are performed on 100% of production lengths. Positive Material Identification (PMI) using XRF and OES analyzers verifies grade compliance on every heat.
Unlike conventional stainless steels that rapidly corrode in sulfuric acid, 904L maintains excellent resistance across a wide concentration and temperature range. Independent laboratory testing confirms corrosion rates below 0.1 mm/year in 10-40% H₂SO₄ at temperatures up to 60°C. This makes 904L seamless pipe the material of choice for acid coolers, heat exchangers, piping systems, and storage tanks in sulfuric acid production and handling facilities worldwide.
904L seamless pipes can be welded using TIG (GTAW), MIG (GMAW), and SMAW processes with ER 385 or E 385-15 filler metals. The low carbon content eliminates the need for post-weld heat treatment in most cases. For optimal corrosion performance, post-weld pickling and passivation are recommended to restore the passive chromium oxide layer.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller
Year Established:
2010
Total Annual:
20000000-50000000
Employee Number:
50~100
Ecer Certification：
Verified Supplier
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