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Home > Welded Tubes > ASTM A269 SA269

ASTM A269 SA269

ASTM A269 / SA269 Stainless Steel Instrumentation & Polished Tubes

Precision, Cleanliness & Dimensional Accuracy for Critical Fluid & Gas Control

Instrumentation systems require absolute accuracy, zero leaks, and smooth, contamination-free tubing to ensure reliable transmission of pressure, flow, and chemical signals.

This is exactly where ASTM A269 / ASME SA269 stainless steel tubing excels.

These tubes are engineered for:

  • High-pressure hydraulic lines
  • Pneumatic control systems
  • Chemical dosing & sampling lines
  • Process instrumentation networks
  • Food & pharmaceutical transfer lines
  • Architectural & aesthetic polished applications

INOX STEEL INDIA manufactures A269/SA269 tubes with extreme dimensional precision, tight OD/WT tolerances, bead-rolled welds, and bright annealed or polished finishes.

Table of Contents

What Are ASTM A269 / SA269 Tubes?

ASTM A269 tubes are austenitic stainless-steel welded or seamless tubes used primarily for instrumentation, hydraulic, pneumatic, and polished applications where:

  • Flow accuracy
  • Pressure stability
  • Corrosion resistance
  • Smooth internal finish
  • Tight tolerances
  • Weld integrity

are non-negotiable.

These tubes undergo bright annealing, polishing, and strict inspection processes to maintain the required cleanliness for precise industrial operation.

Why A269 Tubes Are Used in Instrumentation Systems

1. Tight OD/WT Tolerances = Accurate Control

Instrumentation fittings (compression, ferrule, double-ferrule) require precision. A269 ensures:

  • Consistent OD for leak-free joints
  • Uniform wall thickness for pressure stability
  • Controlled ovality for proper ferrule grip

2. Smooth, Clean Inner Bore for Contamination-Free Flow

Instrumentation often carries:

  • Purging gases
  • Chemical samples
  • Hydraulic fluids
  • Calibration gases

A269 tubes offer:

  • Bright annealed ID
  • Weld bead removal / bead rolling
  • Clean, low Ra surface

3. Corrosion Resistance in Chemical, Marine & Industrial Environments

Depending on the grade:

  • 316 / 316L → Best for chlorides & chemical lines
  • 304 / 304L → General service
  • 321 → High-temperature instrumentation

4. Highly Suitable for Polished Applications

A269 also covers polished tubes used in food, pharmaceutical, cleanroom, and architectural applications.

Grade Comparison — Which Grade Is Right?

Grade Ideal Use Advantages
304 / 304L General hydraulic & pneumatic lines Economical, corrosion-resistant
316 / 316L Chloride-rich, corrosive fluids Superior pitting resistance
321 High-temperature lines Titanium stabilized

Where Are A269 / SA269 Tubes Used?

  • Instrumentation systems & impulse lines
  • Hydraulic & pneumatic circuits
  • Chemical processing & dosing lines
  • Food & pharmaceutical transfer lines
  • Architectural polished applications

How ASTM A269 Tubes Are Manufactured — INOX Expertise

  1. Slit stainless steel coil with narrow tolerance
  2. TIG welded with ID argon purging
  3. Weld bead rolled or removed
  4. Bright annealed in 100% hydrogen
  5. Polished to required grit levels
  6. Laser OD/WT calibration
  7. Hydro & Eddy Current tested
  8. Contamination-free packaging

A. Size Range, OD/WT Chart & Dimension Capabilities

Outside Diameter (OD) Wall Thickness (WT) Application
3.18 mm (1/8”) 0.28 – 1.00 mm Impulse lines
6.35 mm (1/4”) 0.40 – 1.20 mm Hydraulic circuits
9.52 mm (3/8”) 0.50 – 1.50 mm Chemical dosing
12.7 mm (1/2”) 0.60 – 2.00 mm Instrumentation manifolds
Up to 50.8 mm 1.00 – 3.50 mm Polished / architectural

B. Temperature Performance Matrix

Grade Max Service Temperature Suitability
304 / 304L ~870°C General service
316 / 316L ~870°C Chemical & marine
321 900–950°C High-temperature lines

C. Corrosion Resistance Matrix

Environment 304 316 321
General corrosion ⭐⭐⭐⭐ ⭐⭐⭐⭐⭐ ⭐⭐⭐⭐
Chlorides ⭐⭐⭐ ⭐⭐⭐⭐⭐ ⭐⭐⭐
Marine ⭐⭐⭐ ⭐⭐⭐⭐⭐ ⭐⭐⭐
High temperature ⭐⭐⭐ ⭐⭐⭐ ⭐⭐⭐⭐⭐

D. Weldability, Cleanliness & Finish Control

  • TIG welded with argon purging
  • Inside weld bead rolled or removed
  • Bright annealed at 1050–1100°C
  • Controlled Ra value (0.2–0.6 µm for BA)
  • Polished finishes up to 400 grit mirror

E. Testing & Inspection (ASTM A269 / SA269)

  • Hydrostatic test
  • Eddy Current test
  • Weld integrity test
  • Flattening, flare & hardness tests
  • Optional: PMI, IGC, Ra, UT, RT

ASTM A269 vs A249 vs A213

Property A269 A249 A213
ID cleanliness Very High High Medium
Pressure rating High Medium Very High
Typical use Instrumentation Heat exchangers Boilers

Price Range (Indicative)

Grade Price (INR/Kg) Price (USD/Kg)
304 / 304L ₹260 – ₹380 $3.0 – $4.5
316 / 316L ₹360 – ₹520 $4.5 – $6.5
321 ₹420 – ₹650 $5.0 – $8.0

Packaging & Export Handling

  • Cleanroom-grade wrapping
  • Plastic end caps
  • HDPE / LDPE sleeves
  • VCI anti-corrosion film
  • Heat-treated wooden crates

Get Best Price for ASTM A269 / SA269 SS Instrumentation Tubes

A269 = instrumentation/hydraulic & polished tubes
A249 = heat exchanger tubes (BA welded)

Yes — 316L is the leading grade for chemical & marine instrumentation.

Yes — dimensional tolerance & ovality strictly controlled.

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