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ASTM A269 / SA269 Stainless Steel Instrumentation & Polished Tubes

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.

What Are ASTM A269 / SA249 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, or hydraulic fluids. 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 & beverage equipment
Pharmaceutical process lines
Architectural decor (Railings, mirror polish)

MASTER TECHNICAL DATA SHEET — ASTM A269 / ASME SA269

Category: Stainless Steel Instrumentation, Hydraulic & Polished Tubes
Grades: TP304 • TP304L • TP316 • TP316L • TP321
Finish: BA (Bright Annealed), Polished 180/240/320/400 Grit
Manufacturing: Welded / Welded + Bead Rolled / Welded + BA
Brand: INOX STEEL INDIA

Section	Parameter	Technical Specification — ASTM A269 / SA269 Tubes
Standard	Specification	ASTM A269 / ASME SA269 — Austenitic Stainless Steel Welded & Seamless Tubes for instrumentation, hydraulic lines, polished tubes & general corrosion service
	Process	Welded, Welded + Bright Annealed (BA), Polished
Grades	Austenitic SS	304, 304L, 316, 316L, 321
Chemical Composition (%)	TP304/304L	Cr 18–20, Ni 8–11, C ≤ 0.03–0.08
	TP316/316L	Cr 16–18, Ni 10–14, Mo 2–3, C ≤ 0.03–0.08
	TP321	Cr 17–19, Ti stabilized
Mechanical Properties	Tensile Strength	515 MPa (min)
	Yield Strength	205 MPa (min)
	Elongation	35% (min)
Dimensional Range	Outside Diameter	1/8″ (3.18 mm) – 2” (50.8 mm)
	Wall Thickness	0.28 mm – 3.00 mm
	Tolerance	Tight OD/WT control as per instrumentation service
	Length	1–12 meters
Surface Finish	BA Finish	Mirror-like internal & external surface
	Polished Finish	180, 240, 320, 400 Grit • For architectural & hygienic service
Instrumentation Requirements	Weld Integrity	Weld bead removed / bead rolled inside
	ID Surface Cleanliness	Critical for high-pressure fluid accuracy
	Ovality Control	Strict as per hydraulic / pneumatic systems
Corrosion Resistance	304/304L	Moderate
	316/316L	High — best for chlorides, marine, chemical
	321	High temp use
Testing Requirements	Mandatory	Hydrostatic, Eddy Current, Flare, Flange, Reverse Flattening
	Optional	PMI, IGC (A262), UT, RT, Surface Roughness (Ra), Cleanliness
Applications	Industrial	Hydraulic lines, pneumatic systems
	Process Industry	Instrumentation impulse lines
	Food/Pharma	Polished/hygienic tubing
	Chemical	Corrosion-resistant lines
End Finishing	Tube Ends	Plain Ends (PE), Deburred, Cleaned
Package	Export	HDPE wrap, VCI film, polished-protected sleeves, wooden crates
HSN Code	SS Welded Tubes	73064000

Grade Comparison — Which Grade is Right for Your Instrumentation?

Grade	Ideal Use	Advantages
304 / 304L	General hydraulic & pneumatic lines	Economical, corrosion-resistant
316 / 316L	Chloride-rich, corrosive fluids	Molybdenum improves pitting resistance
321	High-temperature lines	Titanium stabilization prevents carbide formation

Quick Recommendation:

👉 For chemical, marine, and high-purity applications → 316L
👉 For general industrial instrumentation → 304/304L
👉 For thermal cycling lines → 321

Where Are A269/SA269 Tubes Used?

Instrumentation Systems

Impulse lines
Pressure transmitters
Flow meters
Sampling lines

Hydraulic Systems

Oil lines
High-pressure transfer
Pneumatic valves

Chemical Processing

Dosing lines
Corrosive fluid transmission

Food & Pharma

Clean, polished tubes for hygienic systems
Transfer of edible liquids

Architectural Applications

Polished handrails
Decorative structures
Industrial fabrications

This results in high-precision, high-purity, smooth-surface tubes ready for critical instrumentation use.

Advantages of A269 Tubes from INOX STEEL INDIA

Leak-proof connections with double-ferrule fittings
Smooth ID for contamination-free service
Excellent corrosion resistance
Tight dimensional tolerances
BA/polished finishes for hygienic and aesthetic use
Compliance with global EPC/OEM requirements

SIZE RANGE, OD/WT CHART & DIMENSION CAPABILITIES

Standard OD × WT Combinations (Instrumentation Quality)

Outside Diameter (OD)	Wall Thickness (WT)	Application Use
3.18 mm (1/8″)	0.28 – 1.00 mm	Impulse lines, control panels
6.35 mm (1/4″)	0.40 – 1.20 mm	Hydraulic & pneumatic circuits
9.52 mm (3/8″)	0.50 – 1.50 mm	Chemical dosing, sampling
12.7 mm (1/2″)	0.60 – 2.00 mm	Instrumentation manifolds
15.88 mm (5/8″)	0.70 – 2.50 mm	High-pressure fluid systems
19.05 mm (3/4″)	0.90 – 3.00 mm	HVAC/pneumatic lines
25.4 mm (1″)	1.00 – 3.00 mm	Process instrumentation
31.75 – 50.8 mm	1.20 – 3.50 mm	Polished / architectural
Up to 2” (50.8 mm)	1.00 – 3.00 mm	Hygienic & decorative tubing

Lengths: 3m • 6m • 12m • Custom cut | Finish: BA, 180/240/320/400 Grit Polish

TEMPERATURE PERFORMANCE MATRIX

Grade	Max Service Temperature	Suitability
304 / 304L	~870°C	General service, pneumatic lines
316 / 316L	~870°C	Chloride-rich & chemical instrumentation
321	900–950°C	High temperature impulse lines

CORROSION RESISTANCE MATRIX (Instrumentation Environments)

Exposure	304/304L	316/316L	321
General Corrosion	⭐⭐⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐⭐
Chlorides / Chemicals	⭐⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐
Marine Atmosphere	⭐⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐
High-Temperature Oxidation	⭐⭐⭐	⭐⭐⭐	⭐⭐⭐⭐⭐
Cleanroom/Pharma	⭐⭐⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐⭐

WELDABILITY, CLEANLINESS & FINISH CONTROL

Instrumentation Tubes Require:

Perfectly smooth ID
Zero weld bead interference
Tight OD tolerance for ferrule fittings
No scaling, no heat tint

INOX Capabilities:

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

These properties ensure leak-free connections, especially with Swagelok-type fittings.

TESTING & INSPECTION (ASTM A269 / SA269)

Mandatory Tests

Hydrostatic
Eddy Current
Weld integrity test
Reverse flattening
Flare / Flange test
Hardness
Mechanical test

Optional Tests (Project / EPC Requirements)

PMI (Positive Material Identification)
IGC Test – ASTM A262 Practice E
Roughness (Ra value) check
Ultrasonic test
Radiography (RT)
Cleanliness test for hygienic tubes

ASTM A269 vs A249 vs A213 — Comparative Engineering Guide

Property	A269 (Instrumentation)	A249 (Heat Exchanger)	A213 (Seamless Boiler)
Surface Finish	⭐⭐⭐⭐⭐ (BA/Polished)	⭐⭐⭐⭐⭐ (BA)	⭐⭐⭐
Weld Bead	Removed/Rolled	Removed/Rolled	NA (Seamless)
ID Cleanliness	Very High	High	Medium
Pressure Rating	High	Medium	Very High
Ideal Use	Instrumentation, hydraulic	Heat exchangers	High-pressure boilers

MATERIAL SELECTION GUIDE (Fast Buyer Decision)

Requirement	Recommended Grade	Reason
General industrial instrumentation	304/304L	Economical & versatile
High corrosion / marine / chemical lines	316/316L	Molybdenum improves pitting resistance
High-temperature impulse lines	321	Ti-stabilized for carbide control
Food & Pharma polished tubes	304L / 316L	Clean, hygienic, low carbon
Architectural polished finish	304 / 304L	Aesthetic & corrosion resistant

PRICE RANGE

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

Prices vary by OD, WT, finish, and volume requirements.

SURFACE FINISH OPTIONS

Finish Type	Application
Bright Annealed (BA)	Instrumentation, hydraulic, high purity
180 Grit Polish	Decorative, industrial
240 Grit Polish	Architectural fittings
320 Grit Polish	Pharma & food
400 Grit Mirror Polish	Hygienic & aesthetic

WHY CHOOSE INOX STEEL INDIA FOR ASTM A269 / SA269 SS INSTRUMENTATION & POLISHED TUBES?

1. High-Precision Tolerances for Ferrule & Compression Fittings
ASTM A269 tubes supplied by INOX are optimized for Swagelok-type and Parker-type fittings. Our tubes maintain:

Tight OD tolerance
Minimal ovality
Smooth ID for leak-proof joints

2. Weld Bead Removed / Bead Rolled — Essential for Clean Flow
Instrumentation lines require zero turbulence and zero contamination. We ensure:

Fully rolled weld bead
No internal protrusion
Smooth bore for uniform flow
Low Ra value (0.2–0.6 µm for BA tubes)

3. Bright Annealed (BA) & Polished Finish Options
INOX offers finishes that improve:

Flow stability
Cleanliness
Corrosion resistance
Visual appeal in decorative use

4. ASTM A269 Tubes for Multiple Industries

Instrumentation & Control (Impulse lines, Transmitters)
Hydraulic & Pneumatic (High-pressure lines)
Chemical & Petrochemical (Dosing lines)
Food & Pharmaceutical (Hygienic systems)
Architectural Applications (Mirror-polished handrails)

INDUSTRIES WE SERVE

Power Plants

Analyzer lines • Manifolds • Impulse tubing

Chemical Processing

Dosing systems • Sampling circuits • Corrosive fluid loops

Food & Pharma

Hygienic transfer • Beverage lines • Pharmaceutical processing

Hydraulics & Pneumatics

Control systems • Valve circuits • High-pressure fluid transfer

Architectural

Polished railings • Decorative structures • Interior fittings

📦 PACKAGING & EXPORT HANDLING

Standard Packaging

Cleanroom-grade wrapping
Plastic end caps
HDPE/LDPE sleeves

Export Packaging

VCI anti-corrosion film
Heat-treated wooden crates
Foam-lined compartments for polished tubing

Documents Provided

EN 10204 3.1 / 3.2 Certificate
Hydro + Eddy Current test reports
PMI results
Surface roughness (Ra) report
Weld bead removal compliance
BA furnace chart

Get Best Price for ASTM A269 / SA269 SS Instrumentation Tubes

Inox Steel India

52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004

Email

steel@inoxsteelindia.in

Phone

+91 9930796690

FAQs

What is ASTM A269 used for?

Instrumentation, hydraulic, pneumatic & polished tubing applications.

What is the difference between A269 and A249?

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

Do you supply 316L A269 tubes?

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

Are the tubes suitable for Swagelok & Parker fittings?

Yes — dimensional tolerance & ovality strictly controlled.

INOX STEEL INDIA supplies ASTM A269 / SA269 stainless steel instrumentation tubes in 304/304L/316/316L/321 with bright annealed & polished finishes. Precision OD/WT tolerance, bead-rolled welds & clean ID for hydraulic, pneumatic, chemical, pharma & architectural use. Exporter to GCC, Europe, Asia & Africa.

Contact us now!