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Stainless Steel 309 | Product Overview
Introduction To Austenitic Stainless Steel 309
MOKSH TUBES & FITTINGS LLP is a leading manufacturer, supplier, exporter, importer, and stockist of Austenitic Stainless Steel 309 products, including pipes, tubes, sheets, plates, bars, and fittings.
Austenitic Stainless Steel 309, is a high chromium and nickel alloy designed for excellent oxidation resistance at elevated temperatures. It contains approximately 23% chromium and 13% nickel, making it ideal for applications involving high heat, thermal cycling, and corrosive environments. SS 309 offers superior resistance to scaling and carburization and maintains good mechanical properties at both high and ambient temperatures.
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Technical Specifications – Stainless Steel 309 (UNS S30900 / EN 1.4833)
| Category | Details |
|---|---|
| Material | Austenitic Stainless Steel 309 |
| UNS No. | S30900 |
| EN / DIN | 1.4833 |
| Alloy Type | High Chromium–Nickel Austenitic SS |
| Chromium | 22 – 24 % |
| Nickel | 12 – 15 % |
| Magnetic Properties | Non-Magnetic |
| Heat Treatable | ❌ No |
| Strengthening Method | Cold Working |
| Oxidation Resistance | Excellent |
| Scaling Resistance | Very Good |
| Typical Use | Furnaces, Heat Treatment, High-Temperature Equipment |
Chemical Composition of Stainless Steel 309
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 22.0 – 24.0 |
| Nickel (Ni) | 12.0 – 15.0 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Nitrogen (N) | ≤ 0.10 |
Physical Properties of Stainless Steel 309
| Property | Imperial Units | Metric Units |
|---|---|---|
| Density | 0.287 lb/in³ | 7.95 g/cm³ |
| Melting Point | 2550 – 2650 °F | 1399 – 1454 °C |
| Modulus of Elasticity | 28 × 10³ ksi | 193 GPa |
| Poisson’s Ratio | 0.29 | — |
Heat Treatment & Fabrication of Stainless Steel 309
| Process | Temperature Range | Purpose |
|---|---|---|
| Solution Annealing | 1040 – 1120 °C | Restore corrosion resistance |
| Cooling | Water / Rapid Air | Maintain austenitic structure |
| Stress Relieving | 300 – 450 °C | Reduce residual stresses |
| Cold Working | — | Increase strength |
| Welding | TIG / MIG / SMAW | Excellent weldability |
📌 SS 309 is commonly selected for intermittent high-temperature service and thermal cycling conditions.
Mechanical Properties of Stainless Steel 309 (Annealed)
| Property | Annealed | Cold-Drawn | Sheet |
|---|---|---|---|
| Tensile Strength | 520 – 655 MPa | 585 – 795 MPa | 550 – 725 MPa |
| Yield Strength (0.2%) | 205 – 345 MPa | 310 – 515 MPa | 240 – 450 MPa |
| Elongation | 35 – 55 % | 20 – 40 % | 30 – 50 % |
| Brinell Hardness | 140 – 190 | 170 – 220 | 150 – 200 |
| Rockwell Hardness | 85 – 95 B | 95 – 105 B | 90 – 100 B |
Available Forms & Size Range – Stainless Steel 309
| Product Form | Size Range |
|---|---|
| Pipes & Tubes | OD 6 – 600 mm, WT 1 – 40 mm |
| Sheets & Plates | 0.5 – 100 mm |
| Coils & Strips | 0.1 – 6 mm |
| Bars (Round / Flat / Hex) | Ø 6 – 350 mm |
| Wire & Mesh | Standard & custom sizes |
| Fittings & Flanges | ASME / DIN standards |
| Custom Components | As per drawing |
International Standards & Equivalent Grades – SS 309
| Standard | Equivalent Grade |
|---|---|
| UNS | S30900 |
| ASTM | A240, A312, A276 |
| ASME | SA240, SA312, SA276 |
| EN | 1.4833 |
| DIN | X12CrNi23-13 |
| JIS | SUS 309 |
| BS | 309S24 |
| ISO | X12CrNi23-13 |
Products in Austenitic Stainless Steel 309
Austenitic Stainless Steel 309 is available in:
Austenitic Stainless Steel 309 products are produced to the following global standards:
Uses and Advantages
Excellent oxidation and corrosion resistance at elevated temperatures
Good resistance to thermal cycling and scaling
Maintains strength and toughness at high temperatures
Good weldability and fabrication properties
Suitable for use in harsh chemical and oxidizing environments
Applications of Austenitic Stainless Steel 309
Austenitic Stainless Steel 309 is extensively used in high-temperature and corrosive environments, such as:
Furnace Parts & Heat Treatment Equipment
Furnace linings, heat exchangers, and radiant tubes requiring resistance to thermal shock and scaling.
Petrochemical & Chemical Industry
Equipment exposed to oxidizing atmospheres and high temperatures, including catalytic reactors.
Aerospace & Power Generation
Gas turbine components, boilers, and exhaust manifolds exposed to extreme heat and corrosive gases.
Automotive Industry
Exhaust systems, mufflers, and catalytic converter components demanding high temperature endurance.
Food Processing
Equipment subject to high temperatures and cleaning chemicals.
WHY CHOOSE US?
STAINLESS STEEL 309 PRICE PER KG (INDIA)
Typical Range: ₹400 – ₹780 per kg
(Price varies by OD, wall thickness, form, and finish)
Contact us for exact quotation based on size and quantity.
FAQ's
What is Austenitic Stainless Steel 309 and what makes it unique?
Austenitic Stainless Steel 309 is a high chromium (22–24%) and nickel (12–15%) alloy designed for superior oxidation and corrosion resistance at elevated temperatures. It is widely used in furnace parts, petrochemical equipment, and exhaust systems due to its ability to maintain strength and toughness under thermal cycling conditions.
What are the key properties of Stainless Steel 309?
SS 309 offers:
- Excellent oxidation resistance up to high temperatures.
- Superior resistance to scaling and carburization.
- Good mechanical strength (tensile strength 520–655 MPa).
- Durability in thermal shock and corrosive environments.
- Good weldability and fabrication properties.
Where is Stainless Steel 309 commonly used?
Stainless Steel 309 is extensively used in furnaces, heat treatment equipment, catalytic reactors, gas turbines, boilers, exhaust manifolds, food processing equipment, and petrochemical plants. Its ability to withstand high heat and oxidation makes it a preferred material in aerospace, automotive, and power generation industries.
How is Stainless Steel 309 different from Stainless Steel 304 and 310?
Compared to SS 304, Stainless Steel 309 has higher chromium and nickel content, making it far more resistant to high-temperature oxidation. While SS 310 has slightly higher alloying elements, SS 309 offers a cost effective balance of heat resistance, strength, and corrosion protection, ideal for industrial high-heat applications.
Who is the best supplier of Stainless Steel 309 in India?
Moksh Tubes & Fittings LLP is a trusted manufacturer, supplier, exporter, importer, and stockist of Stainless Steel 309 products, including pipes, tubes, sheets, plates, bars, fittings, flanges, and fasteners. With international quality standards, custom sizes, competitive pricing, and global delivery, Moksh Tubes & Fittings LLP is a reliable choice for industries requiring premium heat resistant stainless steels.
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For further information or to request a quote on Austenitic Stainless Steel 309 products, contact Moksh Tubes & Fittings LLP — your trusted supplier for premium stainless steel solutions.
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