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Hastelloy C276 Pipe Fittings are premium alloy components designed for superior performance in highly corrosive environments. Made from nickel-molybdenum-chromium alloys with tungsten, these fittings offer exceptional resistance to pitting, stress corrosion cracking, and oxidizing and reducing media. They are widely used in chemical processing, pollution control, and marine applications where durability and reliability are critical.
These fittings are available in various types including elbows, tees, reducers, and flanges, catering to the diverse requirements of piping systems. Each fitting is manufactured to strict industry standards, ensuring precise dimensions, high mechanical strength, and long-lasting performance. Hastelloy C276’s versatility makes it suitable for both welded and threaded connections in complex piping networks.
Hastelloy C276 pipe fittings are high-performance nickel-molybdenum-chromium alloys designed for the most corrosive industrial environments. Known for their exceptional resistance to oxidizing and reducing agents, these fittings are widely used in chemical processing, pollution control, marine, and pharmaceutical industries. They provide long-term reliability in systems handling aggressive chemicals and high-pressure fluids.
Hastelloy C276 contains approximately 57% nickel, 16% molybdenum, 15% chromium, and small amounts of iron, cobalt, and tungsten. This unique composition ensures outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in both oxidizing and reducing media. Its chemical makeup allows it to withstand strong acids such as sulfuric, hydrochloric, and phosphoric acid.
The corrosion-resistant properties of Hastelloy C276 make it ideal for handling aggressive chemicals such as hydrochloric acid, sulfuric acid, and chlorine compounds. Its resistance to oxidizing and reducing agents ensures a long service life, reducing maintenance costs and downtime in industrial processes. This makes C276 pipe fittings a cost-effective choice for chemical plants, refineries, and offshore installations.
Hastelloy C276 Pipe Fittings also perform well under high-temperature conditions, maintaining structural integrity and resisting deformation. The alloy’s high tensile and yield strength provide reliability under pressure, making it suitable for both high-pressure and high-temperature piping applications. Additionally, these fittings comply with ASTM and ASME standards, ensuring quality assurance and global compatibility.
C276 fittings exhibit excellent mechanical properties, including a tensile strength of around 690–760 MPa and a yield strength of 310–380 MPa. Elongation typically ranges from 30–40%, providing ductility and flexibility for high-pressure piping systems. These properties make C276 fittings suitable for demanding industrial applications where both strength and corrosion resistance are essential.
The hallmark of Hastelloy C276 is its superior corrosion resistance. These fittings resist pitting, crevice corrosion, and stress corrosion cracking, even in chloride-rich or oxidizing environments. This makes them ideal for chemical processing, seawater handling, and other applications where standard stainless steels or nickel alloys would fail.
Specification Table
| Specification | Standard | Material | Sizes (NPS) | Pressure Rating | End Connection |
|---|---|---|---|---|---|
| Pipe Elbows | ASME B16.9 / ASTM B574 | Hastelloy C276 (Ni-Mo-Cr-W Alloy) | 1/2" – 48" | 150# – 2500# | Butt Weld / Threaded / Socket Weld |
| Pipe Tees | ASME B16.9 / ASTM B574 | Hastelloy C276 | 1/2" – 48" | 150# – 2500# | Butt Weld / Threaded |
| Reducers | ASME B16.9 / ASTM B574 | Hastelloy C276 | 1/2" – 48" | 150# – 2500# | Butt Weld |
| End Caps | ASME B16.9 / ASTM B574 | Hastelloy C276 | 1/2" – 48" | 150# – 2500# | Butt Weld / Threaded |
| Flanges | ASME B16.5 / ASTM B564 | Hastelloy C276 | 1/2" – 48" | 150# – 2500# | Weld Neck / Slip-On / Blind / Socket Weld |
Chemical Composition (Typical ranges for SSS32760)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | - | 0.02 |
| Manganese (Mn) | - | 0.50 |
| Silicon (Si) | - | 0.50 |
| Phosphorus (P) | - | 0.04 |
| Sulfur (S) | - | 0.03 |
| Nickel (Ni) | 57.0 | 63.0 |
| Molybdenum (Mo) | 15.0 | 17.0 |
| Chromium (Cr) | 14.5 | 16.5 |
| Tungsten (W) | 3.0 | 4.5 |
| Cobalt (Co) | - | 2.0 |
Mechanical Properties (Typical)
| Property | Unit | Value |
|---|---|---|
| Density | g/cm³ | 8.9 |
| Melting Point | °C | 1390 – 1425 |
| Tensile Strength (Ultimate) | MPa | 550 – 750 |
| Yield Strength (0.2% Offset) | MPa | 275 – 380 |
| Elongation | % | 40 – 50 |
| Hardness (Brinell, HB) | HB | 150 – 200 |
| Modulus of Elasticity | GPa | 207 |
| Poisson's Ratio | - | 0.31 |
Equivalent Grades
| Country / Standard | Equivalent Grade |
|---|---|
| ASTM / ASME (USA) | B574 C276 |
| UNS (USA) | N10276 |
| EN / DIN (Europe) | 2.4819 |
| JIS (Japan) | NCF 601 |
| Werkstoff (Germany) | 2.4819 |
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 (NPS) | Outside Diameter (OD, mm) | Wall Thickness (Schedule) | Weight per Piece (kg) |
|---|---|---|---|
| 1/2" | 21.3 | Sch 40 / 80 | 0.50 / 0.65 |
| 1" | 33.4 | Sch 40 / 80 | 1.20 / 1.45 |
| 2" | 60.3 | Sch 40 / 80 | 3.20 / 3.80 |
| 4" | 114.3 | Sch 40 / 80 | 9.50 / 11.20 |
| 6" | 168.3 | Sch 40 / 80 | 17.50 / 20.30 |
| 8" | 219.1 | Sch 40 / 80 | 29.50 / 34.00 |
| 10" | 273.0 | Sch 40 / 80 | 45.50 / 52.20 |
| 12" | 323.9 | Sch 40 / 80 | 65.00 / 74.00 |
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)
1. What is Hastelloy C276 Pipe Fittings used for?
Hastelloy C276 Pipe Fittings are primarily used in chemical, petrochemical, marine, and pollution control industries where corrosion resistance is critical. They are suitable for handling oxidizing and reducing agents, acids, and chlorides.
2. What types of Hastelloy C276 Pipe Fittings are available?
Common types include elbows, tees, reducers, end caps, and flanges. They are available in various sizes, pressure ratings, and end connections such as butt weld, socket weld, and threaded.
3. What are the key properties of Hastelloy C276?
Hastelloy C276 has excellent resistance to pitting, stress corrosion cracking, and oxidation. It also maintains mechanical strength under high temperatures and high pressures, making it ideal for demanding industrial applications.
4. Which standards do Hastelloy C276 Pipe Fittings comply with?
These fittings comply with international standards including ASTM B574, ASME B16.9 for fittings, ASTM B564 for flanges, and UNS N10276 for the alloy material. Equivalent grades exist in EN/DIN, JIS, and Werkstoff standards.
5. How should Hastelloy C276 Pipe Fittings be maintained?
Regular inspection for signs of corrosion, proper cleaning, and avoiding exposure to incompatible chemicals help extend the service life. Proper installation according to standard piping practices is also essential.
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