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Stainless Steel 309 Pipe Fittings are designed to withstand extreme temperatures and corrosive environments, making them ideal for industrial and high-temperature applications. Manufactured from premium SS 309 alloy, these fittings offer excellent oxidation resistance and mechanical strength. They are widely used in chemical plants, power plants, petrochemical industries, and other critical sectors where reliability is essential.
SS 309 Pipe Fittings are available in a variety of types, including elbows, tees, reducers, flanges, and couplings. Elbows help in changing the direction of piping, while tees allow for branch connections. Reducers are used to connect pipes of different diameters, and flanges enable easy assembly and disassembly of pipelines. Each fitting is precisely engineered to meet international standards such as ASME, ASTM, and ANSI.
Stainless Steel 309 pipe fittings are high-temperature austenitic stainless steel materials designed to provide excellent oxidation resistance and mechanical strength at elevated temperatures. Widely used in industrial heating systems, furnaces, and heat exchangers, 309 fittings are ideal for piping systems exposed to thermal cycling and harsh operating conditions.
SS 309 contains approximately 23% chromium and 13% nickel, with small amounts of carbon, manganese, and silicon. This high chromium and nickel content provides enhanced resistance to oxidation and scaling, particularly in high-temperature environments.
These fittings are highly preferred in industries that require high-temperature resistance and corrosion protection. Common applications include furnace components, exhaust systems, chemical processing equipment, heat exchangers, and boilers. SS 309 Fittings also find use in food processing and pharmaceutical industries due to their non-reactive nature. Their versatility makes them essential in both industrial and commercial piping systems.
Stainless Steel 309 Pipe Fittings offer exceptional durability, resistance to oxidation, and corrosion-proof performance even in harsh environments. They maintain structural integrity under thermal cycling and high-pressure conditions. The smooth surface finish ensures minimal friction losses in piping systems, and their high strength-to-weight ratio reduces maintenance costs and extends the lifespan of the system.
309 pipe fittings exhibit tensile strength ranging from 515–690 MPa and yield strength between 205–310 MPa. Elongation typically ranges from 35–45%, providing excellent toughness and ductility. These properties ensure reliable performance in high-temperature piping systems and industrial applications.
The primary advantage of SS 309 fittings is their ability to withstand high temperatures up to 1050°C (1922°F) without significant scaling or loss of mechanical properties. This makes them suitable for use in furnaces, boilers, heat exchangers, and exhaust systems where conventional stainless steels would fail.
Specification Table
| Specification Summary: Stainless Steel 309 Pipe Fittings | |
|---|---|
| Material | Stainless Steel 309 (UNS S30900 / S30908) |
| Product Types | Elbows, Tees, Reducers, Couplings, Flanges, Caps |
| Standards | ASTM A403, ASME B16.9, ASME B16.11, ISO 9001 |
| Size Range | ½ inch to 48 inches (DN 15 to DN 1200) |
| Schedule/Thickness | Sch 10 to Sch 160 or as per customer requirement |
| End Connections | Buttweld, Threaded, Socket Weld, Flanged |
| Surface Finish | Polished, Pickled, or as per customer specification |
| Temperature Resistance | Up to 1000°C (1832°F) |
| Applications | High-temperature pipelines, chemical processing, furnace systems, petrochemical, power plants, food & pharmaceutical industries |
| Key Properties | Excellent oxidation resistance, corrosion resistance, high mechanical strength, durability in high-temperature environments |
Chemical Composition (Typical ranges for SS309)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Chemical Composition: Stainless Steel 309 Pipe Fittings (Wt. %) | |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.03 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 22.0 – 24.0 |
| Nickel (Ni) | 12.0 – 15.0 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Mechanical Properties: Stainless Steel 309 Pipe Fittings | |
|---|---|
| Tensile Strength (UTS) | 515 MPa min (75 ksi) |
| Yield Strength (YS) | 205 MPa min (30 ksi) |
| Elongation (in 50 mm) | 40% min |
| Hardness | 150 – 200 HB |
| Modulus of Elasticity | 193 GPa |
| Density | 7.9 g/cm³ |
| Melting Point | 1400 – 1450°C |
Equivalent Grades
| Equivalent Grades: Stainless Steel 309 Pipe Fittings | |
|---|---|
| ASTM / ASME | AISI 309 / AISI 309S |
| UNS | S30900 / S30908 |
| EN / European | 1.4828 / X10CrNi25-21 |
| JIS (Japan) | SNCM 309 |
| DIN (Germany) | 1.4833 |
| Others | GB / Chinese Standard 0Cr23Ni13 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Size (inch) | Outside Diameter (mm) | Wall Thickness (mm) | Radius / Length (mm) | Weight per Piece (kg) |
|---|---|---|---|---|
| 1/2" | 21.3 | 2.0 | 50 | 0.15 |
| 3/4" | 26.9 | 2.3 | 60 | 0.20 |
| 1" | 33.7 | 2.6 | 70 | 0.28 |
| 1 1/2" | 48.3 | 3.2 | 90 | 0.50 |
| 2" | 60.3 | 3.6 | 110 | 0.85 |
| 3" | 88.9 | 4.0 | 140 | 1.50 |
| 4" | 114.3 | 4.5 | 180 | 2.50 |
| 6" | 168.3 | 5.0 | 250 | 5.00 |
| 8" | 219.1 | 6.0 | 300 | 8.50 |
| 10" | 273.0 | 6.5 | 350 | 12.50 |
| 12" | 323.9 | 7.0 | 400 | 17.50 |
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Frequently Asked Questions (FAQ)
Q1:What is Stainless Steel 309 Pipe Fittings?
Stainless Steel 309 Pipe Fittings are high-temperature resistant fittings made from SS309 alloy. They are commonly used in industries requiring excellent oxidation and corrosion resistance at elevated temperatures.
Q2:What types of fittings are available in SS309?
Common types include elbows, tees, reducers, caps, and flanges, available in various sizes and pressure ratings.
Q3:Where are SS309 Pipe Fittings used?
They are used in chemical, petrochemical, boiler, furnace, and high-temperature process industries where resistance to scaling and corrosion is critical.
Q4:What are the key benefits of SS309 Pipe Fittings?
They offer high temperature and corrosion resistance, durability, and long service life even under harsh conditions.
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