Shanxi Zhongcheng Metal Co., Ltd.
| Standard | ASTM A358 Class 1, ASME SA358, ASTM A312 (alternative) |
| Post-Weld Treatment | Full solution annealing at 1070-1150°C, water quench |
| Inspection | 100% RT on all welds, DPT, PMI on base metal and weld, Hydrostatic Test, Intergranular Corrosion Test per ASTM A262 Practice E, MTC EN 10204 3.1 |
| Welding Process | TIG Plasma + SAW, Class 1 (100% RT) |
| Tensile Strength | ≥ 490 MPa (transverse weld test) |
| Application | Chemical process piping, acid regeneration plants, pulp mill digesters, flue gas desulfurization (FGD) systems |
| Length | 6 Meters, 12 Meters, or custom length up to 15M |
| Yield Strength (0.2%) | ≥ 220 MPa |
| Delivery Time | 20-30 days for standard sizes, 35-45 days for custom specifications |
| Packaging Details | Bevelled end protectors, nylon strapping with edge guards, VCI wrap, seaworthy wooden crate with fumigation certificate, ISO container loading |
| Payment Terms | T/T,L/C at sight |
| Material Grade | 904L / UNS N08904 / EN 1.4539 |
| Bend Test | Guided bend 180°, no cracks per ASTM A370 |
| Supply Ability | 200 Tons per Month |
| Outer Diameter (OD) | 219.1mm - 610mm (8" - 24" NB) |
| Wall Thickness (WT) | 3.0mm - 20.0mm |
| Place of Origin | Zhejiang, China |
| Model Number | 904L-LD-WELD-A358 |
| Brand Name | WNRLN |
| Certification | ISO 9001:2015, ISO 14001, PED 2014/68/EU, ASME U Stamp, MTC EN 10204 3.1 |
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Product Specification
| Standard | ASTM A358 Class 1, ASME SA358, ASTM A312 (alternative) | Post-Weld Treatment | Full solution annealing at 1070-1150°C, water quench |
| Inspection | 100% RT on all welds, DPT, PMI on base metal and weld, Hydrostatic Test, Intergranular Corrosion Test per ASTM A262 Practice E, MTC EN 10204 3.1 | Welding Process | TIG Plasma + SAW, Class 1 (100% RT) |
| Tensile Strength | ≥ 490 MPa (transverse weld test) | Application | Chemical process piping, acid regeneration plants, pulp mill digesters, flue gas desulfurization (FGD) systems |
| Length | 6 Meters, 12 Meters, or custom length up to 15M | Yield Strength (0.2%) | ≥ 220 MPa |
| Delivery Time | 20-30 days for standard sizes, 35-45 days for custom specifications | Packaging Details | Bevelled end protectors, nylon strapping with edge guards, VCI wrap, seaworthy wooden crate with fumigation certificate, ISO container loading |
| Payment Terms | T/T,L/C at sight | Material Grade | 904L / UNS N08904 / EN 1.4539 |
| Bend Test | Guided bend 180°, no cracks per ASTM A370 | Supply Ability | 200 Tons per Month |
| Outer Diameter (OD) | 219.1mm - 610mm (8" - 24" NB) | Wall Thickness (WT) | 3.0mm - 20.0mm |
| Place of Origin | Zhejiang, China | Model Number | 904L-LD-WELD-A358 |
| Brand Name | WNRLN | Certification | ISO 9001:2015, ISO 14001, PED 2014/68/EU, ASME U Stamp, MTC EN 10204 3.1 |
| High Light | ASTM A358 904L stainless steel pipe ，large diameter welded EN 1.4539 pipe ，chemical processing stainless steel pipe | ||
Large diameter piping in chemical plants demands seamless-level integrity at welded-pipe economics. ASTM A358 Class 1 904L welded pipes achieve this through the most rigorous manufacturing and inspection protocol in the industry: 100% radiographic testing of all weld seams, full post-weld solution annealing, and comprehensive NDE on every finished pipe. For chemical processing facilities handling mixed acids, chlorinated solvents, and high-temperature corrosive media, these large diameter 904L pipes provide the ideal balance of performance, availability, and total installed cost.
ASTM A358 defines five classes of welded pipe, with Class 1 representing the highest quality level. The Class 1 designation requires: (1) all longitudinal and circumferential welds to be 100% radiographed after post-weld heat treatment, (2) all welds to be fully penetrated and fusion-welded from both sides or equivalent, and (3) full solution annealing of the finished pipe at 1070-1150°C followed by water quenching. This effectively eliminates the heat-affected zone (HAZ) corrosion susceptibility that concerns engineers when specifying welded pipe for aggressive chemical service. The result is a product with corrosion resistance equivalent to seamless 904L pipe throughout the entire pipe body, including the weld zone.
Production begins with 904L plate or coil stock verified by PMI and ultrasonic testing for lamination defects. The plate is edge-prepared by precision machining to ensure parallel weld bevels, then formed into a cylindrical shape on a hydraulic press brake or three-roll bender depending on diameter. The longitudinal seam is welded using TIG plasma for the root pass to achieve 100% penetration, followed by submerged arc welding (SAW) for fill and cap passes. After welding, the pipe undergoes full solution annealing in a car-bottom furnace with controlled heating rate, soak time, and rapid water quenching. The final production step is calibration (sizing) to achieve roundness within ±1% of nominal diameter.
Every shipment includes a comprehensive EN 10204 3.1 material test certificate, radiographic film reports (digital upon request), PMI verification records for base metal and weld metal, solution annealing furnace charts with time-temperature data, and hydrostatic test certificates. For projects requiring third-party inspection, we coordinate seamlessly with SGS, Bureau Veritas, TUV, Lloyd's Register, and ABS surveyors from mill witness testing through final dispatch.
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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