Customized Large Diameter Stainless Steel Welded Pipe 304/316L ASTM A312 for Industrial Use
Customized Large Diameter Stainless Steel Welded Pipe 304/316L ASTM A312 for Industrial Use
1. Product Description
Stainless steel welded pipe is a tubular product manufactured by cold-forming stainless steel coil or strip into a tubular shape and then longitudinally welding the seam using continuous high-frequency or tungsten inert gas (TIG) welding. The weld zone is typically subjected to solution annealing or post-weld heat treatment to restore corrosion resistance and mechanical properties. Depending on the application, the pipe can be produced as cold-rolled or hot-rolled, with either single-weld or spiral-weld configurations. Common material grades include austenitic (304/304L, 316/316L), ferritic (409, 430), martensitic (410), and duplex (2205, 2507) stainless steels. The product conforms to international standards such as ASTM, EN, JIS, and GB, ensuring high quality and traceability.
2. Product Applications
| Sector | Typical Uses |
| Oil, Gas & Chemical | Process piping, refinery lines, offshore platforms |
| Water & Environment | Desalination, sewage treatment, potable water networks |
| Food, Beverage & Pharma | Sanitary lines, sterile processing, CIP/SIP systems |
| Architecture & Structure | Facade supports, handrails, bridges, decorative screens |
| Energy & Heavy Machinery | Heat exchangers, condensers, exhausts, hydraulic systems |
3. Product Advantages
???? Zero-Compromise Weld Zone
Advanced welding with inert gas shielding + post-weld heat treatment eliminates sensitization, making the weld as strong and corrosion-resistant as the parent metal.
✨ Mirror-Like Surface Quality
From matte 2B to mirror-polished #8 finish, our surfaces reduce fouling, simplify sterilization, and deliver premium aesthetics for exposed architectural projects.
???? Precision Fit, Every Time
State-of-the-art straightening and sizing mills guarantee exceptional straightness and tight OD tolerances, enabling quick, trouble-free on-site installation.
♻️ Sustainable & Circular
100% recyclable, with a service life exceeding 50 years in most environments—a responsible choice for green building certifications.
4.Key Technical Parameters
| Feature | Quick Spec |
| Grades | 304/304L, 316/316L, 310S, 2205, 2507, 904L, and custom alloys |
| OD Range | 6 mm – 1,200 mm (longitudinal); up to 4,800 mm (spiral) |
| Wall Thickness | 0.3 mm – 50 mm |
| Section Shapes | Round, Square, Rectangular, and custom profiles |
| Surface Finishes | 2B, BA, No.4, Hairline, Mirror (8K), Painted, or Coated |
| Standards Met | ASTM A312/A358/A778, EN 10217, JIS G3459, GB/T 12771 |
| Testing | 100% Hydrostatic + Eddy Current / Ultrasonic optional |
| Length | Custom cut from 1 m to 20 m, or supplied in coils |
FAQ
1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.
2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
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