Hastelloy c276

Hastelloy c276

ALLOY C276 | N10276 | 2.4819 | NIMO16CR15W | ХН65МВУ | ЭП760 | NW 0276

Super alloys have exceptional resistance to corrosion, creep and oxidation. It also provides great stability under elevated temperature and stress conditions. Hastelloy C276 is a wrought super alloy with a nickel-chromium-molybdenum composition.

It has a very low carbon content and is considered one of the most versatile in terms of corrosion resistance. This gives the alloy a wide range of uses in chemical environments. The alloy includes many alloying elements with Nickel as its base element along with equal amounts of Molybdenum and Chromium, the other elements in the grade provide a balance in its properties.

There is tungsten added in the grade to resist pitting corrosion and the molybdenum content resists other localized corrosion attacks. A very small quantity of vanadium is added to impart the required hardness. Other alloying elements make sure the grade is machinable and retains its mechanical properties at sufficient temperatures.

It is a solid-phase solution alloy, which naturally makes it durable. Being a nickel compound, the alloy generally resists various chemicals, promotes toughness and provides general corrosion resistance. Hastelloy C276 is one of the rare alloys that resists wet chloride gas, chlorine dioxide and, hypochlorite solutions. It gives great resistance to chloride stress corrosion cracking and other chloride solutions. When tested for cracking under 45% boiling magnesium chloride, the grade 316L took 2 hours to crack, the grade 254SMO took 24 hours to crack, whilst the Hastelloy C276 took 1000 hours to crack. The microstructure of the alloy gives it great welding, forming and machinability. The low carbon content makes the alloy resistant to inter-granular corrosion at the heat affected zones. The grade got into applications to ease the concerns over welding. The low carbon content restricts formation of carbides at the grain boundaries.

The alloy also has considerable impact strength -- a 10mm thickness plate could withstand 470J at room temperature under Charpy v-notch test. Hence, its uses in dynamic applications. The alloy can be conveniently extruded, hot worked and cold worked. The alloy might tend to work harden. At elevated temperatures - strain age cracking problem, common with other strengthened alloys is avoided in this alloy. Hot working can be suitably done around 880-1240°C while heavier sections can be heated to a minimum of 1100°C before forming. The alloy shows its versatility in various conditions and can be conveniently processed and used in many applications.

  • Chemical properties
  • Physical properties
  • General data
  • Standards Specifications
  • Forms of Supply
  • Corrosion Resistance
  • Heat Treatment
  • Weldability
  • Machining
  • Applications
  • Possible grade alternatives
Grade   Ni C Co Mn Si Cr W S V Fe P Mo
Hastelloy C276 Min. Bal(50.99) - - - - 14.5 3.0 - - 4.0 - 15.0
Max. - 0.010 2.5 1.00 0.08 16.5 4.5 - 3.5 7.0 0.04 17.0
Density 8.89 g/cm 3 / 0.321 lb/in 3
Melting Point 1325 -1370 (°C) / 2415 – 2500 (°F)
Specific Heat @ 70°F 0.102 BTU/lb-°F @ 70°F
427 J/kg-°C @ 20°C
Thermal Conductivity @ 70°F 67.9 BTU-in/ ft2-hr-°F
9.8 W/m-°C
Young’s modulus 103ksi 29.8
Shear modulus 103ksi 11.4
Electrical resistivity 51 Microhm-in at 75°F
1.30 Microhm-cm at 24°C
Permeability at 200 oersted (15.9 ka/m) 1.0002
Annealing 1121 (°C) / 2050 (°F)
Quench Rapid Air
Poisson’s ratio 0.307
Standard C276
UNS N10276
EN NiMo16Cr15W
BS -
JIS NW 0276
OR ЭП760
Pipes & Tubes
Summary Standards
Standard Specification for Welded Nickel and Nickel-Cobalt Alloy Pipe ASTM B619
Standard Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube ASTM B622
Standard Specification for Welded Nickel and Nickel-Cobalt Alloy Tube ASTM B626
Standard Specification for Electric Fusion Welded Nickel and Nickel Alloy Pipe ASTM B474
Fittings & Flanges
Summary Standards
Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings ASTM B366
Standard Specification for Nickel Alloy Forgings ASTM B564

Piping and tuning, fittings and flanges, washers.

Hastelloy C276 is a super alloy with exceptional properties in resistance to corrosion and chemical environments. The nickel in the alloy is resistant to various media and resists corrosion in active state as well as aggressive acidic conditions. Pertaining to a good amount of chromium and molybdenum content, oxidizing as well non-oxidizing acids are also restricted. Resistance to localized corrosion like pitting and crevice corrosion is reasonably obtained. The addition of tungsten helps in the process.

A wide range of chemical environments like ferric and cupric oxide, many chloride solutions like sulphuric acid, hydrochloric acid, acid chlorides, acetic acid, formic acid, acetic anhydride, wet chloride gas, hot contaminated mineral acid, and, phosphoric acid with concentration under 65%, can be suitably resisted. The alloy also shows resistance to sulphide stress corrosion cracking as well as cracking in oilfield environments. The grade restricts inter-granular corrosion at the grain boundary due to the low carbon content. Hence, it can be used readily with fine corrosion resistance without post-weld heat treatment. Most of the oxidizing salts are also resisted by the alloy.

Annealing of the grade needs to be carried out after the forming and working processes around 1120-1180°C, followed by a rapid quench. Soaking for appropriate time per section should be carried out. Quenching shall be done in a protective atmosphere. Cold working might slightly affect the stress corrosion cracking resistance and hence annealing of the cold-worked part should be carried out. Since the alloy work hardens rapidly, cold working with intermediate annealing might be required.

The alloy is readily used in weld condition since the inter-granular corrosion at the heat affected zone of the weld is resisted. However, excessive heat input should be avoided. Welding processes like gas tungsten arc, shielded metal arc, gas metal arc welding can be suitably used. Filler metals of matching grades can be used.

The fine microstructure of the alloy gives it great machining characteristics. However, due to work hardening, high heat might be generated during cutting. Machining features like high power machinery, tool as well as workpiece rigidity, correct rake angles and adequate lubrication should be taken care of.

Forgings, Fasteners, Industrial and municipal waste treatment, Flue gas desulfurization system, Pharmaceutical and food processing equipment, Air pollution control, heat exchangers, reaction vessels, evaporators, transfer piping, Sour gas wells, Pickling baths, Pulp and paper production, Sulfuric acid reactors, Plastic production, Equipment for processes utilizing halide or acid catalyst, Organic chloride process equipment, Digesters and bleach plants in the paper industry.

Inconel 625
Grade   Ni C Tl Mn Si Al Cr S P Nb+ta Co Mo Fe
Inconel 625 Min. 58.00 - - - - - 20.00 - - 3.15 - 8.00 -
Max. - 0.10 0.40 0.50 0.50 1.70 23.00 0.015 0.015 4.15 1.00 10.00 5.00

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