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Stainless Steel 309 & 309S Pipes & Tubes Supplier & Stockist in India
High-temperature thermal processing and industrial furnace systems require specialized 23-12 chromium-nickel austenitic alloys engineered for severe heat, oxidation, and structural loads. Steel Emporium is a premier Stainless Steel 309S Pipes & Tubes Supplier in India, delivering precision-engineered tubing solutions certified to withstand high-temperature scaling and cyclic thermal dynamics.
To meet tight production schedules, we are a full-inventory Stainless Steel 309 Pipes & Tubes Stockist in India, offering ready-to-ship Stainless Steel 309 Pipes, Stainless Steel 309 Tubes, SS 309S Pipes, and SS 309S Tubes in seamless, ERW, and welded options. Backed by 25+ years of expertise, our supply chain strictly meets ISO 9001:2015 quality standards and full mill certification.
For applications requiring superior marine corrosion resistance or high-temperature capabilities, explore our complementary Stainless Steel 316L & 316LN Pipes & Tubes stock list for specialized environments.
For high-pressure furnace vessels needing enhanced creep strength with low-carbon weld protection, rely on an established Stainless Steel 309S Pipes & Tubes Stockist in India. We supply Stainless Steel 309S Pipes and SS 309S Tubes under ASTM A312, ASTM A213, and ASTM A269 standards with MTC verification and direct mill pricing.
Jump To Section: Material Specs | Grade Selection | Size Chart | FAQs
ASTM A213 / A269 / A312 SS 309 & 309S Technical Specifications
Our processing facilities deliver precision cold drawing, bright annealing, custom length cutting, and surface polishing across all 23-12 heat-resistant grade variants.
| Technical Parameter | Specification Scope & Manufacturing Capabilities |
|---|---|
| Governing Specifications | ASTM A213 / A269 / A312, ASME SA312, DIN, EN, JIS, AISI |
| Grade Variants | Stainless Steel 309 (UNS S30900), 309S (UNS S30908) |
| 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 |
Grade Selection Guide: Choosing Between 309 & 309S
SS 309 Pipes & Tubes – Best for High-Temperature Service
Standard SS 309 Pipes contain a balanced matrix of 23% chromium and 12% nickel, providing exceptional resistance to oxidation up to 1038°C in continuous service. As a dedicated Stainless Steel 309 Pipes & Tubes Stockist in India, we supply this grade for radiant tubes, furnace parts, and heat-treating muffles where heavy post-weld aqueous corrosion exposure is absent.
SS 309S Pipes & Tubes – Low Carbon for Safe Welding
Sourcing from a primary Stainless Steel 309S Pipes & Tubes Supplier in India provides a low-carbon alloy (0.08% max) that prevents chromium carbide precipitation during welding. This allows heavy-gauge SS 309S Tubes and pipes to operate safely in aggressive thermal environments in the as-welded condition without needing post-weld solution annealing.
Chemical, Mechanical & Equivalent Specifications
| Element / Parameter | SS 309 (UNS S30900) | SS 309S (UNS S30908) |
|---|---|---|
| Carbon (C) | 0.20% Max | 0.08% Max |
| Manganese (Mn) | 2.00% Max | 2.00% Max |
| Silicon (Si) | 1.00% Max | 1.00% Max |
| Phosphorus (P) | 0.045% Max | 0.045% Max |
| Sulfur (S) | 0.030% Max | 0.030% Max |
| Chromium (Cr) | 22.0 – 24.0% | 22.0 – 24.0% |
| Nickel (Ni) | 12.0 – 15.0% | 12.0 – 15.0% |
| Mechanical Property | SS 309 | SS 309S |
|---|---|---|
| Tensile Strength (MPa min) | 515 | 515 |
| Yield Strength (0.2% Proof MPa min) | 205 | 205 |
| Elongation (% in 50 mm min) | 40% | 40% |
| Hardness (Brinell Max) | 217 HBW | 217 HBW |
| Standard / Grade | WERKSTOFF NR. | UNS Number | EN Standard | JIS (Japan) |
|---|---|---|---|---|
| SS 309 | 1.4828 | S30900 | X15CrNiSi20-12 | SUS 309 |
| SS 309S | 1.4833 | S30908 | X12CrNi23-13 | SUS 309S |
Stainless Steel 309 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 |
Key Industrial Applications
Selecting the 309 series alloy provides a versatile, highly heat-resistant solution across processing, furnace, and power generation industrial sectors.
Thermal Processing & Kiln Exhausts (SS 309S)
Low-carbon SS 309S Pipes handle continuous thermal oxidizers, rotary kilns, and welded muffle furnace connections without undergoing intergranular decay along heat-affected zones.
Power Generation & High-Temperature Piping (SS 309)
SS 309 Tubes are widely specified for steam superheater lines and boiler supports due to elevated creep strength and oxidation resistance up to 1038°C.
Petrochemical Refining & Catalytic Equipment (SS 309S)
Standard Stainless Steel 309S Tubes with precision finishes are installed in catalytic converters, flare stack tips, and thermal cracking units requiring oxidation-resistant piping.
Waste Heat Recovery & Incinerator Lines (SS 309)
Applied in heat exchanger tubing and waste gas ducts, ASTM A213 309 seamless tubes maintain structural integrity under severe thermal and gas-corrosion stresses.
Commercial Oven & Annealing Equipment (SS 309 / 309S)
Deployed in industrial heat-treating baskets, burner tubes, and radiant piping where long-term scaling resistance and high thermal limits are mandatory.
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 Compliance | 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. |
| Verified Corporate Address | Registered Office & Operations: 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 309 or 309S stainless steel piping for your project? Connect with our technical sales specialists today for competitive wholesale pricing, MTC documentation, and global export shipping schedules.