INCONEL alloy C-276 (UNS N10276/W.Nr. 2.4819) is a nickel-molybdenum-chromium superalloy with an addition of tungsten designed to have excellent corrosion resistance in a wide range of severe environments. The high molybdenum content imparts resistance to localized corrosion such as pitting. The low carbon minimizes carbide precipitation during welding to maintain resistance to intergranular attack in heat-affected zones of welded joints.
Material Availability forms & Material specification for Hastelloy C276
- Pipe & Tube – welded and seamless
- Pipe Fittings
- Welding Wire (AWS Classifications: ERNiCrMo-4 and ENiCrMo-4)
|Pipe Smls||Pipe Welded||Tube Smls||Tube Welded||Sheet / Plate||Bar||Forging||Fitting|
Chemical composition of Hastelloy C276
|Remainder||15.0-17.0||14.5-16.5||4.0-7.0||3.0-4.5||2.5 max||1.0 max||.01 max||.35 max||.04 max||.03 max||.08 max|
Mechanical properties of Hastelloy C276
|Product Form||Tensile (ksi)||.2% Yield (ksi)||Elongation %|
|Tube & Pipe||105.4||45.4||70|
Weldability of Hastelloy C276
Alloy C-276 Welding electrodes is a solid solution, nickel-molybdenum-chromium, corrosion-resistant alloy. This electrode is used for dissimilar welding between nickel base alloys and stainless steels, as well as for surfacing and cladding. Alloy C-276 Welding Electrode is also used as a matching composition filler material for welding alloy C-276 wrought and cast products. INCONEL alloy C-276 has good weldability and can be used as-welded for most applications.
Welding electrode/ filler wire for welding Hastelloy C276
1. Selection of Welding Consumables:
Welding electrodes for different welding processes are given below:
- Welding electrode for SMAW welding of Hastelloy is ENiCrMo-4 (SFA 5.11)
- Welding electrode for For GTAW (TIG) or MIG/ MAG welding of Hastelloy is ERNiCrMo-4 (SFA 5.14)
Welding electrode/ filler wire for welding Hastelloy C276 to Carbon steel or stainless steel
Use ENiCrMo-4 or ERNiCrMo-4 for dissimilar welding of Hastelloy C276 to Carbon steel or stainless steel material.
When depositing weld overlay of C276 on carbon steel, care shall be taken to ensure minimal dilution so save the costly consumables. Barrier layer should be deposited with diameter 2.5 mm followed by the weld depositing using 3.15 mm or 4 mm electrodes.
In service weld overlay repairs of C276 weld deposits has reported weld cracking. To avoid these cracking, ensure the weld area is clean from any foreign particles especially copper, which can transfer to material when using copper coated gouging electrodes. Use of stringer beads along with low heat input is beneficial.
Welding electrode/ filler wire for welding Hastelloy C276 to 316stainless steel
Stick or SMAW Welding of SS316 to Hastelloy C276 shall be carried out with ENiCrMo-4. TIG or MIG welding can be done using ERNiCrMo-4. For new material, not much precaution is required. Although its advised to use low heat input and stringer beads to minimize the weld dilution.