Shanxi Zhongcheng Metal Co., Ltd.
| Payment Terms | T/T,L/C at sight |
| Standard | ASTM A249 / ASME SA249, ASTM A688, EN 10216-5 |
| Supply Ability | 50,000 Pieces per Month |
| U-Bend Radius | R = 1.5D minimum (standard), R = 1.0D on request |
| Tensile Strength | ≥ 490 MPa |
| Delivery Time | 10-15 days for standard sizes, 20-25 days for custom specifications |
| Outer Diameter (OD) | 12.7mm - 38.1mm (1/2" - 1-1/2") |
| Wall Thickness (WT) | 0.89mm - 3.05mm (BWG 20 - BWG 11) |
| Packaging Details | Individual plastic tube sleeves, partitioned foam-lined corrugated boxes, export-grade plywood case outer packaging |
| Surface Finish | Bright Annealed (BA), Ra ≤ 0.4 μm |
| Application | Shell & tube heat exchangers, condensers, evaporators, chemical process heaters |
| Length (Leg to Leg) | Up to 15,000mm |
| Inspection | Eddy Current Testing, Helium Leak Test, PMI, Bore Scope, Hydrostatic Test, MTC EN 10204 3.1 |
| Hardness | ≤ 90 HRB |
| Flaring Test | Per ASTM A450, 60° expansion cone, no cracks |
| Material Grade | 904L / UNS N08904 / EN 1.4539 |
| Flattening Test | Per ASTM A450, no cracks or defects |
| Place of Origin | Jiangsu, China |
| Model Number | 904L-UBEND-A249 |
| Brand Name | WNRLN |
| Certification | ISO 9001:2015, PED 2014/68/EU, MTC EN 10204 3.1, Helium Leak Test Certified |
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Product Specification
| Payment Terms | T/T,L/C at sight | Standard | ASTM A249 / ASME SA249, ASTM A688, EN 10216-5 |
| Supply Ability | 50,000 Pieces per Month | U-Bend Radius | R = 1.5D minimum (standard), R = 1.0D on request |
| Tensile Strength | ≥ 490 MPa | Delivery Time | 10-15 days for standard sizes, 20-25 days for custom specifications |
| Outer Diameter (OD) | 12.7mm - 38.1mm (1/2" - 1-1/2") | Wall Thickness (WT) | 0.89mm - 3.05mm (BWG 20 - BWG 11) |
| Packaging Details | Individual plastic tube sleeves, partitioned foam-lined corrugated boxes, export-grade plywood case outer packaging | Surface Finish | Bright Annealed (BA), Ra ≤ 0.4 μm |
| Application | Shell & tube heat exchangers, condensers, evaporators, chemical process heaters | Length (Leg to Leg) | Up to 15,000mm |
| Inspection | Eddy Current Testing, Helium Leak Test, PMI, Bore Scope, Hydrostatic Test, MTC EN 10204 3.1 | Hardness | ≤ 90 HRB |
| Flaring Test | Per ASTM A450, 60° expansion cone, no cracks | Material Grade | 904L / UNS N08904 / EN 1.4539 |
| Flattening Test | Per ASTM A450, no cracks or defects | Place of Origin | Jiangsu, China |
| Model Number | 904L-UBEND-A249 | Brand Name | WNRLN |
| Certification | ISO 9001:2015, PED 2014/68/EU, MTC EN 10204 3.1, Helium Leak Test Certified | ||
| High Light | UNS N08904 904L stainless steel heat exchanger tube ，ASTM A249 cold drawn U bend tube ，19.05mm OD 904L stainless steel pipe | ||
Heat exchanger reliability in corrosive chemical processes hinges on tube integrity. Our UNS N08904 904L U-bend tubes combine the exceptional corrosion resistance of super austenitic stainless steel with precision cold-drawn manufacturing to deliver unmatched performance in shell and tube heat exchangers operating in sulfuric acid, phosphoric acid, and high-chloride process streams. ASTM A249 compliance ensures every tube meets the stringent dimensional, mechanical, and non-destructive testing requirements demanded by process engineers worldwide.
Each 904L tube is cold drawn through precision tungsten carbide dies to achieve tight outer diameter tolerances of ±0.05mm and wall thickness tolerances of ±10%. The cold working is followed by bright annealing in a controlled-atmosphere hydrogen furnace at 1070-1150°C, producing a mirror-smooth oxide-free surface with Ra ≤ 0.4 μm. This bright annealed finish is critical: it eliminates the need for post-fabrication pickling, reduces fouling rates in service, and provides the ideal surface condition for eddy current non-destructive testing sensitivity.
U-bends are formed on CNC mandrel bending machines with precise radius control down to R=1.0D minimum. After bending, each tube undergoes a low-temperature stress relief treatment at 450-500°C for 2 hours to reduce residual forming stresses without sensitizing the microstructure. Flattening and flaring tests per ASTM A450 are performed on each bend lot to verify formability after bending. The tubes are then subjected to 100% eddy current testing and helium leak testing (1*10⁻⁶ mbar·L/s sensitivity) to guarantee zero defects.
| Property | Value | Test Standard |
|---|---|---|
| Tensile Strength | ≥ 490 MPa | ASTM A370 |
| Yield Strength (0.2% Offset) | ≥ 220 MPa | ASTM A370 |
| Elongation in 50mm | ≥ 35% | ASTM A370 |
| Hardness | ≤ 90 HRB | ASTM E18 |
| Thermal Conductivity at 20°C | 12.5 W/m·K | ISO 22007-2 |
| Coefficient of Thermal Expansion (20-500°C) | 16.0 * 10⁻⁶ /K | ASTM E228 |
904L U-bend tubes are specified across demanding sectors: chemical processing (sulfuric acid coolers and reboilers), oil and gas refining (crude distillation overhead condensers), pharmaceutical manufacturing (high-purity solvent recovery), and pulp and paper (black liquor evaporators). The alloy's ability to resist both uniform corrosion and localized attack across diverse chemical environments makes it the preferred tube material for multi-purpose heat exchanger installations where process fluids vary seasonally.
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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