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Stainless Steel 321 Pipes & Tubes Supplier & Stockist in India
Operating severe thermal processing lines without structural failure demands high-integrity materials built to resist sensitization. As a leading Stainless Steel 321 Pipes & Tubes Supplier in India, Steel Emporium provides titanium-stabilized piping certified for elevated-temperature exposure.
As a ready-stock Stainless Steel 321 Pipes & Tubes Stockist in India, we supply seamless and welded options backed by 25+ years of ISO 9001:2015 certified expertise. For lower-temperature applications requiring chloride pitting resistance, explore our Stainless Steel 316 Pipes & Tubes range.
Jump To Section: Material Specs | Grade Advantages | Size Chart | FAQs
ASTM A213 / A269 / A312 SS 321 Technical Specifications
Our processing facilities deliver precision cold drawing, bright annealing, custom length cutting, and surface polishing across all titanium-stabilized grade variants.
| Technical Parameter | Specification Scope & Manufacturing Capabilities |
|---|---|
| Governing Specifications | ASTM A213 / A269 / A312 / A249 / A358 / A376, ASME SA312, DIN, EN, JIS, AISI |
| Grade Variants | Stainless Steel 321 (UNS S32100) |
| Manufacturing Types | Seamless, Welded, ERW, EFW, Cold Drawn (CDW), Hot Finished |
| Profile Configurations | Round, Square, Rectangular, Hydraulic, Custom Shapes |
| Outside Diameter (OD) Scope | Seamless: 6 mm to 114.3 mm OD | Welded / ERW: 10 mm to 114.3 mm OD (1/2" to 24" Nominal) |
| Schedule Wall Thickness Range | SCH 5S, SCH 10S, SCH 20, SCH 30, SCH 40S, STD, SCH 80S, SCH 120, SCH 160, XXS |
| Length & End Treatments | 1m to 12.5m, Custom Cut | Plain, Beveled, Threaded Ends |
| Surface Finish & Coatings | AP (Annealed & Pickled), BA (Bright Annealed), 180–400 Grit Polish, Electropolished |
Key Advantages of Stainless Steel 321 Pipes & Tubes
Intergranular Corrosion Resistance
Titanium additions prevent carbide precipitation, protecting the alloy during prolonged thermal exposure between 425°C and 850°C.
High-Temperature Creep Strength
Delivers superior short-time stress-rupture properties and thermal stability compared to standard 304/304L grades.
Safe As-Welded Performance
Retains full structural and corrosion integrity after welding without requiring post-weld heat treatment.
Oxidation & Scaling Resistance
Resists thermal scaling and degradation in continuous service temperatures up to 870°C.
Excellent Ductility & Formability
Highly ductile matrix allows seamless cold bending, flanging, and custom tube fabrication.
Chemical, Mechanical & Equivalent Specifications
| Element / Parameter | SS 321 (UNS S32100) Min | SS 321 (UNS S32100) Max |
|---|---|---|
| Carbon (C) | -- | 0.08% Max |
| Manganese (Mn) | -- | 2.00% Max |
| Silicon (Si) | -- | 0.75% Max |
| Phosphorus (P) | -- | 0.045% Max |
| Sulfur (S) | -- | 0.030% Max |
| Chromium (Cr) | 17.0% | 19.0% |
| Nickel (Ni) | 9.00% | 12.00% |
| Nitrogen (N) | -- | 0.10% Max |
| Titanium (Ti) | 5 x (C+N) | 0.70% Max |
| Mechanical Property | SS 321 |
|---|---|
| Tensile Strength (MPa min) | 515 |
| Yield Strength (0.2% Proof MPa min) | 205 |
| Elongation (% in 50 mm min) | 40% |
| Hardness (Brinell Max) | 217 HBW |
| Hardness (Rockwell B Max) | 95 HRB |
| Standard / Grade | WERKSTOFF NR. | UNS Number | EN Standard | JIS (Japan) |
|---|---|---|---|---|
| SS 321 | 1.4541 | S32100 | X6CrNiTi18-10 | SUS 321 |
Stainless Steel 321 Series Size & Schedule Chart
| Nominal Size (NB) | SCH 5S / 10S Wall | SCH 40S Wall | SCH 80S / 160 Wall |
|---|---|---|---|
| 1/2" NB (21.34 mm OD) | 1.65 mm / 2.11 mm | 2.77 mm | 3.73 mm / 4.78 mm |
| 3/4" NB (26.67 mm OD) | 1.65 mm / 2.11 mm | 2.87 mm | 3.91 mm / 5.56 mm |
| 1" NB (33.40 mm OD) | 1.65 mm / 2.77 mm | 3.38 mm | 4.55 mm / 6.35 mm |
| 1-1/2" NB (48.26 mm OD) | 1.65 mm / 2.77 mm | 3.68 mm | 5.08 mm / 7.14 mm |
| 2" NB (60.32 mm OD) | 1.65 mm / 2.77 mm | 3.91 mm | 5.54 mm / 8.74 mm |
| 3" NB (88.90 mm OD) | 2.05 mm / 3.05 mm | 5.49 mm | 7.62 mm / 11.13 mm |
| 4" NB (114.30 mm OD) | 2.11 mm / 3.05 mm | 6.02 mm | 8.56 mm / 13.49 mm |
| 6" NB (168.28 mm OD) | 2.77 mm / 3.40 mm | 7.11 mm | 9.52 mm / 18.26 mm |
Industrial Applications of SS 321
The 321 series offers high corrosion and heat resistance across demanding chemical, power, aerospace, and automotive environments.
Aerospace Exhaust Systems
Aircraft piston engine manifolds, collector rings, and flexible expansion joints operating under severe thermal shock.
Chemical & Petrochemical Refining
Thermal cracking units, hydrotreater lines, and furnace transfer piping exposed to intermediate temperatures (400°C–800°C).
Chemical Manufacturing Equipment
Nitric acid processing, organic chemical synthesis, and high-temperature waste recovery systems.
Power Generation & Boiler Units
Seamless superheater elements, reheater coils, and steam headers running under elevated thermal stresses.
Automotive & Thermal Engineering
Industrial incinerators, heavy-duty diesel exhaust manifolds, and thermal oxidizer ductwork.
Quality Assurance, MTC Certification & Testing Standards
Every shipment processed by Steel Emporium undergoes verification under our ISO 9001:2015 & PED 2014/68/EU Quality Policy to guarantee compliance.
| Certification / Standard | Compliance & Testing Scope |
|---|---|
| ISO 9001:2015 & Pressure Scope | Certified QMS with PED 2014/68/EU and AD 2000 Merkblatt approvals. |
| EN 10204 3.1 & 3.2 MTC | Official test reports covering heat numbers, chemistry, and factory origin tracking. |
| PMI & Lab Verification | 100% XRF spectro testing and NABL-accredited laboratory inspections. |
| Mechanical & Weld NDT | Hydrostatic, eddy current, and flaring tests guarantee 100% seam integrity. |
| Third-Party Inspection (TPI) | Inspection-ready for SGS, TUV, Bureau Veritas, or Lloyds. |
| Registered Corporate Office | 102, Durga Devi Street, Mumbai - 400004, Maharashtra, India |
| Central Warehouse & Stockyard | Plot 943, Kalamboli Steel Market, Navi Mumbai - 410218, Maharashtra, India |
Frequently Asked Questions
Request a Technical Sourcing Quote
Ready to source high-performance 321 stainless steel piping for your project? Connect with our technical sales specialists today for competitive wholesale pricing, MTC documentation, and global export shipping schedules.