Hastelloy C276 socketweld fittings are a nickel-molybdenum-chromium alloy. They are used in piping systems where the connection needs to hold up under corrosive conditions, high pressure, or elevated temperatures. It handles wet chlorine, hydrochloric acid, sulfuric acid, and several other aggressive media without significant degradation. That is why it gets specified in chemical plants, pharma units, and offshore applications where standard Stainless grades simply do not last.
The socketweld design itself is fairly straightforward. The pipe end is inserted into a recessed socket in the fitting, then fillet welded on the outside. This gives a strong mechanical joint with good leak resistance. It is commonly used in smaller pipe sizes, typically up to 2 inches, where a full butt weld may not be practical or necessary.
C276 as an alloy has a low carbon content, which helps reduce carbide precipitation during welding. This matters because carbide precipitation at grain boundaries can make a material vulnerable to corrosion in the heat-affected zone. In process piping, that kind of localized attack can cause failures that are hard to detect early.
At Adarsh Stainless Pvt Ltd, these fittings are produced to meet ASME and ASTM standards. The common forms include elbows, tees, couplings, reducers, and end caps. Dimensional tolerances are maintained as per MSS SP-79 and related specifications.
These fittings are not a general-purpose product. They are selected for particular service conditions where the resistance to corrosion is the primary concern, and where the cost of alloy material can be justified by the service environment. Hastelloy C276 socket weld fittings are important when the application involves strong acids, chloride-rich fluids, or high-temperature corrosive gases.
Table Of Content
Here are some key features and benefits of Hastelloy C276 socket weld fittings:
ASTM B564 / ASME SB564
ASME 16.11, MSS SP-79, 83, 95, 97, BS 3799
1/8” NB to 4” NB (Socketweld, Forged)
2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS
Socketweld Fittings, Forged Fittings
EN 10204/3.1B
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc
90º Elbows, 45º Elbows, Tees, Cross, Couplings, Reducer Inserts, Pipe Nipple, Unions
| STANDARD | WERKSTOFF NR. | UNS | JIS | GOST | EN | OR |
| Hastelloy C276 | 2.4819 | N10276 | NW 0276 | ХН65МВУ | NiMo16Cr15W | ЭП760 |
| Grade | C | Mn | Si | S | Co | Ni | Cr | Fe | Mo | P |
| C276 | 0.010 max | 1.00 max | 0.08 max | 0.03 max | 2.50 max | 50.99 min* | 14.50 – 16.50 | 4.00 – 7.00 | 15.00 – 17.00 | 0.04 max |
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Hastelloy C276 | 8.89 g/cm3 | 1370 °C (2500 °F) | Psi – 1,15,000 , MPa – 790 | Psi – 52,000 , MPa – 355 | 40 % |
Oil & Gas Industrires
Chemical Industries
Construction Industries
Offshore Pipelines & Pipe Works
Petrochemical Industry
Shipbuilding Industries
Hydraulic Applications
Piping Systems
Refining Industry
Food Processing Industry
Pulp & Paper Industry
Power Plant Industry
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