Longitudinal Stainless Steel Welded Pipe Pickled Finish ASTM A312 A269 A249 A358
Price:
Negotiable (Request a Quote)
MOQ:
100kg
Delivery Time:
15-25days
Brand:
Baosteel，TISCO
Product Description
The Longitudinal Welded Stainless Steel Pipe is manufactured by roll forming high-quality stainless Steel coil into a cylindrical shape and welding the seam along the length of the pipe using advanced TIG (GTAW), laser, or plasma welding technologies. This continuous longitudinal seam provides a strong, uniform weld that is fully annealed to restore corrosion resistance and mechanical properties. Longitudinal welded pipe offers a cost-effective alternative to seamless pipe while delivering excellent dimensional accuracy, consistent wall thickness, and reliable performance for a wide range of industrial, commercial, and sanitary applications.
Product Specifications
| Parameter | Details |
|---|---|
| Standards | ASTM A312, A269, A249, A358; EN 10217-7; JIS G3459 |
| Available Grades | 304, 304L, 316, 316L, 321, 347, 310S |
| Outer Diameter | 6 mm – 1219 mm (1/8″ – 48″ NPS) |
| Wall Thickness | 0.5 mm – 12.7 mm |
| Length | 3m, 6m, or custom lengths up to 12m |
| Welding Process | TIG (GTAW), Laser, Plasma, or ERW |
| Weld Seam | Single longitudinal seam |
| Heat Treatment | Annealed after welding (standard) |
| Surface Finish | Mill finish, pickled, brushed, or polished |
| End Finish | Plain ends, beveled ends, or grooved |
Chemical Composition (Typical Values, %)
| Grade | C ≤ | Si ≤ | Mn ≤ | P ≤ | S ≤ | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| 304 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-10.5 | – |
| 304L | 0.03 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-12.0 | – |
| 316 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
| 316L | 0.03 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
Mechanical Properties (at Room Temperature)
| Grade | Tensile Strength (MPa) min | Yield Strength (MPa) min | Elongation (%) min | Hardness (HB) max |
|---|---|---|---|---|
| 304 | 515 | 205 | 35 | 201 |
| 304L | 485 | 170 | 35 | 201 |
| 316 | 515 | 205 | 35 | 217 |
| 316L | 485 | 170 | 35 | 217 |
Tested in accordance with ASTM E8 / E8M.
Key Features
- Cost-Effective – Lower cost than seamless pipe
- Large Diameter Capability – Available up to 48″ (1219 mm)
- Consistent Wall Thickness – High dimensional accuracy from coil stock
- Annealed Weld Seam – Restores corrosion resistance and ductility
- Smooth Internal Surface – Low friction loss for fluid applications
- Good Weldability – Easy to join with standard welding methods
- Wide Size Range – Available from 6 mm to 1219 mm OD
- Various Finishes – Mill, pickled, brushed, or polished
Longitudinal Weld vs. Other Weld Types
| Weld Type | Seam Orientation | Typical Diameter | Typical Application |
|---|---|---|---|
| Longitudinal | Straight along length | 6 mm – 1219 mm | General purpose, process piping |
| Spiral / Helical | Continuous spiral | 300 mm – 3600 mm | Large diameter water/oil lines |
| ERW | Longitudinal (high frequency) | 6 mm – 610 mm | Utility and structural |
Dimensional Tolerances (ASTM A312)
| Parameter | Tolerance |
|---|---|
| Outer diameter | ±0.4 mm for OD ≤ 48.3 mm; ±0.8% for larger |
| Wall thickness | ±12.5% |
| Length (fixed) | +0 / -3 mm |
| Straightness | 0.2% of total length |
| Ovality | Within OD tolerance |
Applications
Process Piping
- Chemical and petrochemical lines
- Pharmaceutical process piping
- Food and beverage transfer lines
Water Treatment
- Potable water distribution
- Reverse osmosis feed lines
- Wastewater treatment
HVAC
- Chilled water lines
- Condenser water piping
- Steam and condensate lines
Oil & Gas
- Utility water systems
- Fire protection mains
- Low-pressure gathering lines
Structural
- Handrails and guardrails
- Scaffolding
- Support structures
General Industrial
- Compressed air systems
- Cooling water circuits
- Instrumentation lines
Manufacturing Process
| Step | Description |
|---|---|
| 1. Coil Unwinding | Stainless steel coil is unwound and leveled |
| 2. Slitting | Coil is slit to required width |
| 3. Forming | Strip is roll-formed into cylindrical shape |
| 4. Welding | Longitudinal seam is welded (TIG / Laser / Plasma) |
| 5. Seam Annealing | Weld seam is heat treated to restore properties |
| 6. Sizing | Pipe passes through sizing rollers |
| 7. Cutting | Cut to specified lengths |
| 8. Heat Treatment | Full annealing (if specified) |
| 9. Finishing | Pickling, polishing, or other surface treatment |
Longitudinal Welded vs. Seamless Pipe
| Property | Longitudinal Welded | Seamless |
|---|---|---|
| Cost | Lower | Higher (30-50%) |
| Lead Time | Shorter | Longer |
| Max Diameter | 48″ (1219 mm) | 24″ (610 mm) |
| Wall Consistency | Excellent | Good |
| Weld Seam | Present – NDT verified | None |
| High Pressure Service | Moderate | High |
| Corrosive Service | Good (annealed) | Excellent |
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For inquiries, technical datasheets, or custom sizes, please contact our sales team.
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Company
Shanxi Zhongcheng Metal Co., Ltd.
Location
Room 2, No. 221 Tianzhang Avenue, Fengdong New City, Xi'an, Shaanxi Province
Contact Person
Zhongcheng Metal