TIG Stainless Steel Welded Pipe ASTM A269 Polished Electropolished Finish
The TIG Welded Stainless Steel Pipe is manufactured using Tungsten Inert Gas (GTAW) welding technology, which produces a high-quality, consistent longitudinal weld seam with excellent penetration and minimal heat input. This process results in a smooth, clean weld bead with no spatter or oxidation, making it ideal for applications requiring superior weld integrity and corrosion resistance. TIG welded pipes are widely used in sanitary, pharmaceutical, food processing, and high-purity industries where weld quality and surface finish are critical. Available in a range of austenitic stainless steel grades and surface finishes.
| Parameter | Details |
|---|---|
| Standards | ASTM A269, A312, A249; ASME BPE; EN 10217-7; JIS G3459 |
| Available Grades | 304, 304L, 316, 316L, 316Ti, 321, 347 |
| Outer Diameter | 6 mm – 610 mm (1/8″ – 24″ NPS) |
| Wall Thickness | 0.5 mm – 6.0 mm |
| Length | 3m, 6m, or custom lengths up to 12m |
| Welding Process | TIG (GTAW) – Autogenous or with filler wire |
| Weld Seam | Single longitudinal seam |
| Shielding Gas | Argon (100%) or Argon-Helium mix |
| Heat Treatment | Annealed after welding (standard) |
| Surface Finish | Mill finish, pickled, brushed, polished (180-600 grit), or electropolished |
| End Finish | Plain ends, beveled ends, or sanitary tri-clamp ends |
| Grade | C ≤ | Si ≤ | Mn ≤ | P ≤ | S ≤ | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| 304L | 0.03 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-12.0 | – |
| 316L | 0.03 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
| 316Ti | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
Composition per ASTM A269 / A312.
| Grade | Tensile Strength (MPa) min | Yield Strength (MPa) min | Elongation (%) min | Hardness (HRB) max |
|---|---|---|---|---|
| 304L | 485 | 170 | 35 | 92 |
| 316L | 485 | 170 | 35 | 95 |
| 316Ti | 515 | 205 | 35 | 95 |
Tested in accordance with ASTM E8 / E8M.
High Quality Weld – Smooth, clean weld bead with no spatter
Narrow Heat Affected Zone (HAZ) – Minimal distortion and oxidation
Excellent Corrosion Resistance – Preserved through inert gas shielding
Good Surface Finish – Smooth internal and external surfaces
Sanitary Grade Available – Suitable for food, pharma, biotech applications
Autogenous Welding Option – No filler metal for ultra-clean applications
100% Weld Inspection – Hydrostatic or eddy current tested
Annealed After Welding – Restores full corrosion resistance
| Feature | Benefit |
|---|---|
| No spatter | Clean weld zone, no post-weld cleaning required |
| Precise heat control | Minimal distortion, suitable for thin walls |
| Inert gas shielding | Prevents oxidation, maintains corrosion resistance |
| Smooth weld bead | Ideal for sanitary and high-purity applications |
| Autogenous welding | No filler metal for ultra-clean welds |
| Full penetration | Strong, leak-proof weld seam |
| Parameter | Tolerance |
|---|---|
| Outer diameter | ±0.1 mm for OD ≤ 25 mm; ±0.4% for larger |
| Wall thickness | ±10% |
| Length (fixed) | +0 / -3 mm |
| Straightness | 0.15% of total length |
| Weld bead height | ≤ 0.2 mm internal |
| Finish | Grit | Description | Application |
|---|---|---|---|
| Mill Finish | As-welded | Oxide scale present | Industrial, concealed |
| Pickled | Acid-treated | Clean matte surface | Chemical, marine |
| Brushed / Satin | 180-240 | Directional grain | General purpose |
| Polished | 320-400 | Semi-reflective | Food equipment |
| Fine Polished | 600 | Smooth, low Ra | Pharmaceutical |
| Electropolished | N/A | Mirror-like, ultra-smooth | Biotech, high-purity |
Dairy process lines
Brewery transfer lines
Beverage dispensing systems
Edible oil piping
Purified water (PW) and WFI systems
Clean steam lines
Bioreactor process piping
Sanitary transfer lines
High-purity chemical transfer
Solvent and intermediate lines
Heat exchanger tubing
Ultra-high-purity gas lines
Chemical delivery systems
Product transfer lines
Sanitary utility piping
| Property | TIG Welded | ERW Welded | Laser Welded |
|---|---|---|---|
| Weld quality | Excellent | Good | Excellent |
| Heat input | Low | Medium | Very low |
| Weld bead smoothness | Very smooth | Moderate | Very smooth |
| Oxidation control | Excellent (gas shield) | Limited | Excellent |
| Thin wall capability | Excellent | Good | Excellent |
| Cost | Medium | Low | High |
| Typical applications | Sanitary, pharma, food | Industrial, utility | High precision |
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