Super Alloy HASTELLOY(r) C276 (UNS N10276)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Annealing
     Cold Working
     Welding
     Forging
     Forming
     Machinability
     Heat Treatment
     Hardening
     Hot Working
     Aging
Applications

Introduction

Super alloys or high performance alloys are available in a variety of shapes and contain elements in different combinations to obtain a specific result. These alloys are of three types that include iron-based, cobalt-based and nickel-based alloys. The nickel-based and cobalt-based super alloys are available as cast or wrought based alloys according to composition and application.

Super alloys have good oxidation and creep resistance and can be strengthened by precipitation hardening, solid-solution hardening and work hardening methods. They can also function under high mechanical stress and high temperatures and also in places that require high surface stability.

HASTELLOY(r) C276 is a wrought corrosion-resistant alloy that resists the development of grain boundary precipitates that degrade corrosion resistance.

The following datasheet provides an overview of HASTELLOY(r) C276.

Chemical Composition

The chemical composition of HASTELLOY(r) C276 is outlined in the following table.

Element Content (%)
Nickel, Ni 57
Molybdenum, Mo 15-17
Chromium, Cr 14.5-16.5
Iron, Fe 4-7
Tungsten, W 3-4.50
Cobalt, Co  2.50
Manganese, Mn  1
Vanadium, V  0.35
Silicon, Si  0.080
Phosphorous, P  0.025
Carbon, C  0.010
Sulfur, S  0.010

Physical Properties

The following table shows the physical properties of HASTELLOY(r) C276.

Properties Metric Imperial
Density 8.89 g/cm³ 0.321 lb/in³
Melting point 1371°C 2500°F

Mechanical Properties

The mechanical properties of HASTELLOY(r) C276 are displayed in the following table.

Properties Metric Imperial
Tensile strength (@thickness 4.80-25.4 mm, 538°C/@thickness 0.189-1.00 in, 1000°F) 601.2 MPa 87200 psi
Yield strength (0.2% offset, @thickness 2.40 mm, 427°C/@thickness 0.0945 in, 801°F) 204.8 MPa 29700 psi
Elastic modulus (RT) 205 GPa 29700 ksi
Elongation at break (in 50.8 mm, @thickness 1.60-4.70 mm, 204°C/@thickness 0.0630-0.185 in, 399°F) 56% 56%
Hardness, Rockwell B (plate) 87 87

Thermal Properties

The thermal properties of HASTELLOY(r) C276 are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@24-93°C/75.2-199°F) 11.2 µm/m°C 6.22 µin/in°F
Thermal conductivity (-168 °C) 7.20 W/mK 50.0 BTU in/hr.ft².°F

Other Designations

Equivalent materials to HASTELLOY(r) C276 are as follows.

ASTM B366 ASTM B574 ASTM B622 ASTM F467 DIN 2.4819
ASTM B575 ASTM B626 ASTM B619 ASTM F468  
         

Fabrication and Heat Treatment

Annealing

HASTELLOY(r) C276 is generally used in the solution treated condition. This alloy is soaked at 1121°C (2050°F) and then quenched in a rapid manner.

Cold Working

Conventional cold working procedures are used for cold working HASTELLOY(r).

Welding

HASTELLOY(r) C276 is capable of being welded by the commonly used welding methods. During the welding process excessive input of heat should be avoided. For corrosive applications this alloy is capable of being used in the “as-welded” condition without the need for more heat treatment.

Forging

Conventional methods are used to forge or hot-upset HASTELLOY(r) C276.

Forming

HASTELLOY(r) C276 can be formed by being cold worked using conventional techniques.

Machinability

HASTELLOY(r) C276 has good machinability characteristic.

Heat Treatment

HASTELLOY(r) C276 is solution heat treated at 1121°C (2050°F) and then quenched rapidly. In case of forging or hot forming, the parts should first be solution heat treated before usage.

Hardening

HASTELLOY(r) C276 is cold worked to be hardened.

Hot Working

Super alloy HASTELLOY(r) C276 is capable of being extruded or hot formed. After the hot forming process, this alloy should be solution heat treated.

Aging

Aging is not performed for HASTELLOY(r) C276 that is utilized in a solution treated condition.

Applications

HASTELLOY(r) C276 is used for desulphurization of flue gas equipment and for chemical process equipment.

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