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Inox Steel India supplies ASTM A632 Small-Diameter Stainless Steel Tubing designed for applications that demand tight OD/WT tolerances, exceptional cleanliness, smooth internal surfaces, and reliable corrosion resistance. These tubes are widely used in instrumentation circuits, hydraulic systems, pharmaceutical equipment, chemical dosing lines, and small-bore heat exchanger applications.
ASTM A632 covers seamless and welded small-diameter austenitic stainless-steel tubes, typically produced in coil form or short straight lengths, with bright annealed finishing to ensure clean fluid flow and minimal contamination risk. Their lightweight construction and flexibility make them ideal for precision bending, tube routing, and compact system layouts.
✔ Grades Supplied
These tubes undergo cold drawing, bright annealing, solution annealing, eddy current testing, and surface inspection, ensuring consistent dimensional stability and clean, defect-free performance.
Our ASTM A632 tubing is trusted by:
Inox Steel India supplies ASTM A632 tubing across India, the Middle East, Europe, Africa, and South-East Asia — with complete certification, export-grade packaging, and fast dispatch support.
| Parameter | ASTM A632 Small-Diameter Tubing |
|---|---|
| Standard | ASTM A632 — Seamless & Welded Austenitic Stainless Steel Small-Diameter Tubes |
| Grades Available | TP304, TP304L, TP316, TP316L |
| Size Range (OD) | 0.125″ (3.18 mm) to 0.625″ (15.88 mm) |
| Thickness (WT) | 0.10 mm to 2.0 mm |
| Manufacturing Process | Seamless / Welded • Cold Drawn • Bright Annealed (BA) |
| Length Options | Straight Lengths • Coil Tubes • Custom Cut Length |
| Surface Finish | Bright Annealed (BA) • Annealed & Pickled • Polished |
| Tolerance Level | Tight tolerances for small OD/WT (instrumentation-grade) |
| Corrosion Resistance | Moderate to high depending on grade • Strong in steam, water, neutral & mild chemicals |
| Mechanical Properties | Tensile: 485–620 MPa • Yield: 170–310 MPa (Depending on grade) |
| Heat Treatment | Bright Annealed • Solution Annealed as per grade |
| End Finish | Plain End • Square Cut • Deburred • Coil Ends |
| Mandatory Testing | Eddy Current • Hydrostatic • Tensile Test • Flattening / Flaring |
| Special Testing | IGC Test • PMI • Surface Roughness • Microstructure |
| Documentation | MTC EN 10204 3.1 • NDT Reports • BA Finish Test Reports |
| Key Advantages | Clean internal surface • Flexible bending • Precision for instrumentation |
| Typical Applications | Small-bore instrumentation lines • Hydraulic systems • Condensers • Chemical dosing lines • Gas distribution |
ASTM A632 tubing is engineered for precision flow control, small-bore instrumentation, and clean media transfer in demanding industrial environments. Its tight tolerances, bright annealed finish, and consistent cold-drawn metallurgy make it suitable for pharma, instrumentation, chemical dosing, heat exchangers, and hydraulic lines.
🔹 1. Instrumentation & Control Systems
Small-diameter precision tubing ideal for signal accuracy.
Applications:
Recommended Grades: TP316L • TP304L
🔹 2. Hydraulic & Pneumatic Systems
High flexibility + smooth ID ensures stable pressure transfer.
Used For:
Best Grades: TP304 • TP316
🔹 3. Chemical & Dosing Lines
Accurate flow delivery of chemical solutions & solvents.
Applications:
Recommended: TP316 / TP316L for higher corrosion resistance
🔹 4. Pharma, Biotech & Food-Grade Flow Systems
Bright annealed tubing prevents contamination in hygienic media transfer.
Used In:
Key Grade: TP316L (pharma-grade)
🔹 5. Small-Bore Heat Exchangers & Condensers
Ideal for low-volume, compact thermal systems.
Applications:
🔹 6. Automotive, Aerospace & Micro-Engineering
Lightweight & stable under vibration.
Used For:
| Tubing Type | OD Range | WT Range | Applications |
|---|---|---|---|
| Small-Bore Instrumentation Tubes | 3–12.7 mm | 0.20–2.0 mm | Precision measurement & control |
| Coiled Tubes | 1.6–12 mm | 0.25–1.5 mm | Pharma, gas, hydraulic |
| Straight Length Tubes | 6–15.8 mm | 0.5–2.0 mm | Chemical, general service |
(Custom OD/WT available on request.)
| Grade | Approx. Price (₹/kg) |
|---|---|
| TP304 / TP304L | ₹350 – ₹550 |
| TP316 / TP316L | ₹420 – ₹700 |
| Bright Annealed Tubing | +10–25% premium |
Mandatory Tests (ASTM A632):
Special Tests (On Demand):
Documentation Supplied:
Inox Steel India is a leading supplier of ASTM A632 stainless steel small-diameter tubes, engineered for precision, clean fluid transfer and compact system routing. Our tubes are manufactured using cold drawing, bright annealing and high-accuracy OD/WT control, making them ideal for instrumentation, pharma, hydraulic and chemical dosing applications.
✔ Why We Are Trusted for A632 Small-Diameter Tubing
We support global OEMs and system integrators with reliable quality and immediate dispatch availability.
| Industry | Uses |
|---|---|
| Instrumentation | Impulse lines, gauges, control tubing |
| Pharmaceutical & Biotech | PW/WFI lines, skids, dosing circuits |
| Chemical Processing | Chemical feed lines, specialty gas distribution |
| Hydraulic & Pneumatic | Actuators, equipment routing |
| Food & Beverage | Clean transfer of liquids and additives |
| Heat Exchanger OEMs | Mini condensers & compact exchangers |
| Automotive & Aerospace | Fuel lines, small-bore testing assemblies |
These tubes are suitable where precision, cleanliness and flexible routing are essential.
We ensure secure, contamination-free packing for delicate and small-diameter coils/tubes.
Packaging Options:
Major Export Destinations:
UAE • Saudi Arabia • Kuwait • Qatar • Oman • Singapore • Malaysia
Vietnam • South Africa • Kenya • Nigeria • Europe • USA • Canada
We help clients with:
✔ Selecting 304 vs 316L
✔ Coil tubing application & sizing
✔ Material compatibility for chemicals
✔ Clean-flow system design
✔ Project-specific pricing & documentation
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
steel@inoxsteelindia.in
+91 9930796690
TP316L offers the best corrosion resistance.
Yes — seamless & welded coils for continuous installations.
Yes — BA finish & clean ID make them ideal for PW/WFI systems.
MTC 3.1, NDT reports, chemical/mechanical tests & BA finish validation.
Inox Steel India supplies ASTM A632 small-diameter stainless steel tubing in TP304, TP304L, TP316 and TP316L. Bright annealed, tight-tolerance tubes for instrumentation, pharma, hydraulic and chemical dosing applications. Coils & cut lengths available with MTC 3.1.