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Quality Longitudinal Stainless Steel Welded Pipe Pickled Finish ASTM A312 A269 A249 A358 factory
Quality Longitudinal Stainless Steel Welded Pipe Pickled Finish ASTM A312 A269 A249 A358 factory

Longitudinal Stainless Steel Welded Pipe Pickled Finish ASTM A312 A269 A249 A358

Basic Properties
Place of Origin: MADE IN CHAINA
Brand Name: Baosteel，TISCO
Certification: EN 10204 Type 3.1 / 3.2 available
Model Number: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507
Trading Properties
Minimum Order Quantity: 100kg
Price: Negotiable (Request a Quote)
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Ability: 10000tons
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Molybdenum Alloy Stainless Steel Pipe

Stainless Steel Pipe Chloride Resistance

Longitudinal Stainless Steel Welded Pipe
Product Summary
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 ...

Product Details

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Longitudinal Stainless Steel Welded Pipe

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Stainless Steel Welded Pipe Pickled Finish
Country Of Origin: MADE IN CHAINA
Brand: Baosteel，TISCO
Certifications: ISO/EN 10204 Type 3.1 / 3.2 Available
Grade: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507 / 630 (17-4PH)
MOQ: 100kg
Price: Negotiable (Request A Quote)
Packaging: Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag
Delivery Time: 15-25days
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Capacity: 10000tons
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
ParameterDetails
StandardsASTM A312, A269, A249, A358; EN 10217-7; JIS G3459
Available Grades304, 304L, 316, 316L, 321, 347, 310S
Outer Diameter6 mm – 1219 mm (1/8″ – 48″ NPS)
Wall Thickness0.5 mm – 12.7 mm
Length3m, 6m, or custom lengths up to 12m
Welding ProcessTIG (GTAW), Laser, Plasma, or ERW
Weld SeamSingle longitudinal seam
Heat TreatmentAnnealed after welding (standard)
Surface FinishMill finish, pickled, brushed, or polished
End FinishPlain ends, beveled ends, or grooved
Chemical Composition (Typical Values, %)
GradeC ≤Si ≤Mn ≤P ≤S ≤CrNiMo
3040.080.752.000.0450.03018.0-20.08.0-10.5–
304L0.030.752.000.0450.03018.0-20.08.0-12.0–
3160.080.752.000.0450.03016.0-18.010.0-14.02.0-3.0
316L0.030.752.000.0450.03016.0-18.010.0-14.02.0-3.0
Mechanical Properties (at Room Temperature)
GradeTensile Strength (MPa) minYield Strength (MPa) minElongation (%) minHardness (HB) max
30451520535201
304L48517035201
31651520535217
316L48517035217

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 TypeSeam OrientationTypical DiameterTypical Application
LongitudinalStraight along length6 mm – 1219 mmGeneral purpose, process piping
Spiral / HelicalContinuous spiral300 mm – 3600 mmLarge diameter water/oil lines
ERWLongitudinal (high frequency)6 mm – 610 mmUtility and structural
Dimensional Tolerances (ASTM A312)
ParameterTolerance
Outer diameter±0.4 mm for OD ≤ 48.3 mm; ±0.8% for larger
Wall thickness±12.5%
Length (fixed)+0 / -3 mm
Straightness0.2% of total length
OvalityWithin 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
StepDescription
1. Coil UnwindingStainless steel coil is unwound and leveled
2. SlittingCoil is slit to required width
3. FormingStrip is roll-formed into cylindrical shape
4. WeldingLongitudinal seam is welded (TIG / Laser / Plasma)
5. Seam AnnealingWeld seam is heat treated to restore properties
6. SizingPipe passes through sizing rollers
7. CuttingCut to specified lengths
8. Heat TreatmentFull annealing (if specified)
9. FinishingPickling, polishing, or other surface treatment
Longitudinal Welded vs. Seamless Pipe
PropertyLongitudinal WeldedSeamless
CostLowerHigher (30-50%)
Lead TimeShorterLonger
Max Diameter48″ (1219 mm)24″ (610 mm)
Wall ConsistencyExcellentGood
Weld SeamPresent – NDT verifiedNone
High Pressure ServiceModerateHigh
Corrosive ServiceGood (annealed)Excellent

Contact Us
For inquiries, technical datasheets, or custom sizes, please contact our sales team.

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