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Stainless Steel 310 / 310S Pipe Fittings are designed for high-temperature and high-pressure applications, offering excellent resistance to oxidation and corrosion. These fittings are made from an austenitic stainless steel alloy containing high levels of chromium and nickel, which enhances their ability to withstand elevated temperatures. SS 310 and 310S pipe fittings are widely used in industries such as petrochemical, power generation, furnace manufacturing, and heat treatment plants due to their outstanding thermal stability and strength.
Grade 310 stainless steel contains a higher carbon content, providing superior strength at elevated temperatures, while Grade 310S, the low-carbon variant, minimizes carbide precipitation during welding, ensuring excellent weldability. These pipe fittings are available in various types including elbows, tees, reducers, caps, crosses, and stub ends to meet diverse piping system requirements. The combination of high strength and excellent oxidation resistance makes them suitable for use in environments up to 1100°C.
Stainless Steel 310 and 310S pipe fittings are high-temperature austenitic stainless steels designed for excellent oxidation resistance and mechanical strength in extreme thermal conditions. These fittings are widely used in industrial furnaces, heat exchangers, boilers, and other piping systems exposed to elevated temperatures.
SS 310 contains approximately 25% chromium and 20% nickel, while 310S is the low-carbon variant (<0.08% carbon) to minimize carbide precipitation during welding. Both alloys also contain small amounts of manganese, silicon, and phosphorus, providing superior resistance to oxidation and scaling at high temperatures.
Our Stainless Steel 310 / 310S Pipe Fittings are manufactured following international standards such as ASTM A403 and ASME B16.9, ensuring precision and durability. They are available in both seamless and welded forms, catering to different industrial applications. Each fitting is thoroughly tested for dimensional accuracy, mechanical strength, and corrosion resistance to ensure long-lasting performance in harsh operating conditions.
These fittings offer excellent resistance to sulfidation and carburization, making them ideal for applications involving continuous exposure to heat and corrosive gases. Additionally, they maintain good ductility and toughness even at sub-zero temperatures, ensuring versatility across various industries. The combination of high chromium and moderate nickel content provides superior oxidation resistance compared to other austenitic stainless steels like 304 and 316.
310/310S pipe fittings offer tensile strength ranging from 515–700 MPa and yield strength between 205–310 MPa. Elongation typically ranges from 35–45%, offering excellent toughness and ductility. These properties ensure reliability and structural integrity under thermal stress in high-temperature environments.
The key advantage of SS 310 and 310S fittings is their ability to maintain strength and resist oxidation up to 1150°C (2102°F). This makes them ideal for furnace piping, kiln linings, exhaust systems, and other high-temperature applications where conventional stainless steels would fail.
Specification Table
| Specifications | Details |
|---|---|
| Product Name | Stainless Steel 310 / 310S Pipe Fittings |
| Grades | SS 310, SS 310S |
| Standards | ASTM A403 / ASME SA403 |
| Type | Seamless, Welded, ERW, Fabricated |
| Fittings Type | Elbow, Tee, Reducer, Cap, Stub End, Cross, Coupling, Nipple |
| Size Range | 1/2” NB to 48” NB (Nominal Bore) |
| Dimensions | ASME/ANSI B16.9, B16.11, MSS-SP-43 |
| Schedule | Sch 5S, 10S, 40S, 80S, 160S, XXS |
| Form | Buttweld, Socket Weld, Threaded |
| End Connection | Beveled, Plain, Threaded |
| Applications | Power Generation, Heat Exchangers, Furnace Components, Petrochemical Plants, Refineries |
| Equivalent Standards | UNS S31000 (310), UNS S31008 (310S), WNR 1.4841 / 1.4845 |
Chemical Composition (Typical ranges for SS310 310S)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Grade 310 (%) | Grade 310S (%) |
|---|---|---|
| Carbon (C) | 0.25 max | 0.08 max |
| Manganese (Mn) | 2.00 max | 2.00 max |
| Silicon (Si) | 1.50 max | 1.50 max |
| Phosphorus (P) | 0.045 max | 0.045 max |
| Sulfur (S) | 0.030 max | 0.030 max |
| Chromium (Cr) | 24.0 – 26.0 | 24.0 – 26.0 |
| Nickel (Ni) | 19.0 – 22.0 | 19.0 – 22.0 |
| Iron (Fe) | Balance | Balance |
Mechanical Properties (Typical)
| Property | Grade 310 | Grade 310S |
|---|---|---|
| Tensile Strength (MPa) | 515 min | 515 min |
| Yield Strength (0.2% Proof) (MPa) | 205 min | 205 min |
| Elongation (% in 50mm) | 40 min | 40 min |
| Hardness (Brinell) | 217 max | 217 max |
| Melting Range (°C) | 1400 – 1450 | 1400 – 1450 |
Equivalent Grades
| Standard | Stainless Steel 310 | Stainless Steel 310S |
|---|---|---|
| UNS | S31000 | S31008 |
| WNR | 1.4841 | 1.4845 |
| Grade | 310 | 310S |
| AFNOR | Z 15 CN 25-20 | Z 15 CNS 25-20 |
| BS | 310S24 | 310S16 |
| EN | X15CrNi25-20 | X8CrNi25-21 |
| JIS | SUS 310 | SUS 310S |
| GOST | 20Kh25N20S2 | 20Kh23N18 |
| DIN | 1.4841 | 1.4845 |
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.
| NPS (inches) | Outside Diameter (mm) | Center to End (A) mm | Approx Weight (kg) |
|---|---|---|---|
| 1/2" | 21.3 | 38 | 0.15 |
| 3/4" | 26.7 | 38 | 0.20 |
| 1" | 33.4 | 38 | 0.25 |
| 1 1/2" | 48.3 | 57 | 0.60 |
| 2" | 60.3 | 76 | 1.10 |
| 3" | 88.9 | 114 | 2.90 |
| 4" | 114.3 | 152 | 5.50 |
| 6" | 168.3 | 229 | 12.50 |
| 8" | 219.1 | 305 | 23.00 |
| 10" | 273.0 | 381 | 38.00 |
Types Of Pipe Fittingss and Tubes
Tube Unions
Bite Type Tube Fittings
Stainless Steel Pipe Fittings
Forged Fsitting
Fitting
Carbon Steel Butt Weld Pipe Fittings
Frequently Asked Questions (FAQ)
What are Stainless Steel 310 and 310S Pipe Fittings?
Stainless Steel 310 and 310S pipe fittings are high-temperature resistant fittings made primarily from an austenitic chromium-nickel alloy. The grade 310 contains higher carbon content, while 310S is the low-carbon version offering superior weldability and resistance to sensitization.
What is the difference between SS 310 and SS 310S?
The main difference lies in the carbon content. SS 310 has about 0.25% carbon, providing higher strength at elevated temperatures, whereas SS 310S has a maximum of 0.08% carbon, making it more suitable for welded applications where carbide precipitation is a concern.
What are the key properties of Stainless Steel 310 / 310S Pipe Fittings?
These fittings exhibit excellent oxidation resistance up to 1100°C, good creep strength, and outstanding corrosion resistance in moderately carburizing atmospheres. They also have good mechanical strength and toughness at both high and low temperatures.
Where are Stainless Steel 310 / 310S Pipe Fittings used?
SS 310 / 310S pipe fittings are commonly used in heat treatment furnaces, power plants, cement industries, thermal oxidizers, refineries, and petrochemical processing plants where high temperature and oxidation resistance are required.
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