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ASTM A632

ASTM A632 Small-Diameter Tubing – High-Precision Stainless Steel Tubes

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.

Table of Contents

Grades Supplied Under ASTM A632

  • TP304 / TP304L – Standard corrosion resistance & excellent formability
  • TP316 / TP316L – Higher chloride resistance & hygienic application suitability

These tubes undergo cold drawing, bright annealing, solution annealing, eddy current testing, and surface inspection, ensuring consistent dimensional stability and clean, defect-free performance.

Industries That Trust ASTM A632 Tubing

  • Instrumentation panel builders
  • Pharma & biotech manufacturers
  • Chemical plants and dosing system OEMs
  • Hydraulic & pneumatic system integrators
  • Heat exchanger OEMs
  • Engineering fabrication companies

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.

Applications of ASTM A632 Small-Diameter Tubing

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.

Instrumentation & Control Systems

  • Impulse & gauge lines
  • Instrument panel tubing
  • Pneumatic control lines
  • Process measurement systems

Recommended Grades: TP316L · TP304L

Hydraulic & Pneumatic Systems

  • Hydraulic actuator circuits
  • Pneumatic tools
  • Compact routing systems
  • Fuel & oil distribution lines

Best Grades: TP304 · TP316

Chemical & Dosing Lines

  • Dosing pumps
  • Chemical feed lines
  • Neutral & mildly corrosive fluid systems
  • Specialty gas distribution

Recommended: TP316 / TP316L

Pharma, Biotech & Food-Grade Flow Systems

  • Water purification systems
  • WFI & PW loops
  • Medical equipment
  • Biotech skids & process units

Key Grade: TP316L (pharma-grade)

Small-Bore Heat Exchangers & Condensers

  • Laboratory exchangers
  • Coil exchangers
  • Mini condensers
  • Cooling assemblies

Typical Size Range Used (Indicative)

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

Price Range (India Market — Indicative)

Grade Approx. Price (₹/kg)
TP304 / TP304L ₹350 – ₹550
TP316 / TP316L ₹420 – ₹700
Bright Annealed Tubing +10–25% premium

Testing & Quality Compliance

  • Hydrostatic Test
  • Eddy Current Test
  • Tensile Test
  • Hardness Test
  • Flattening Test
  • Flaring Test
  • IGC Test (on demand)
  • PMI Test
  • Surface Roughness Check
  • UT / Microstructure Analysis
  • BA Finish Validation

Why Choose Inox Steel India for ASTM A632 Small-Diameter Tubing

  • Ultra-tight tolerances for small OD/WT
  • Bright annealed (BA) for high-purity applications
  • Coiled tubes for long-run, joint-free installations
  • Excellent bending & routing characteristics
  • Zero-defect finishing with full NDT compliance
  • Fast delivery for shutdowns & urgent replacements
  • Complete traceability with MTC EN 10204 3.1

Industries & Applications We Serve

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

Export Packaging & Global Shipping

  • PE-wrapped bundles
  • Individual coil wrapping
  • End caps for ID protection
  • Anti-corrosion plastic film
  • Wooden crates / fumigated boxes
  • Color-coded grade & heat number marking

Talk to Our Technical Team

📞 Call / WhatsApp: +91-XXXXXXXXXX
📧 Email: sales@inoxsteelindia.com

 

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.

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