Super Alloy Duranickel™ Alloy 301

Topics Covered

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

Introduction

Super alloys or high performance alloys include iron-based, cobalt-based and nickel-based alloys. These alloys contain good oxidation and creep resistance and are available in different shapes.

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

Duranickel™ alloy 301 is an age-hardenable alloy and has greater hardness and strength in comparison with Nickel 200 alloy.

The following datasheet provides an overview of Duranickel™ alloy 301.

Chemical Composition

The chemical composition of Duranickel™ alloy 301 is outlined in the following table.

Element Content (%)
Nickel, Ni ≥ 93
Aluminum, Al 4.0-4.75
Silicon, Si ≤ 1
Iron, Fe ≤ 0.60
Manganese, Mn ≤ 0.50
Carbon, C ≤ 0.30
Titanium, Ti 0.25-1
Copper, Cu ≤ 0.25
Sulfur, S ≤ 0.010

Physical Properties

The following table shows the physical properties of Duranickel™ alloy 301.

Properties Metric Imperial
Density 8.19 g/cm3 0.296 lb/in3
Melting point 1427°C 2600°F

Mechanical Properties

The mechanical properties of Duranickel™ alloy 301 are displayed in the following table.

Properties Metric Imperial
Tensile strength 689-1030 MPa 100000-150000 psi
Yield strength (@strain 0.200 %) 414-896 MPa 60000-130000 psi
Shear modulus (typical for steel) 76 GPa 11000 ksi
Elastic modulus (tension) 207 GPa 30000 ksi
Poisson's ratio 0.310 0.310
Elongation at break 15-35% 15-35%
Hardness, Brinell (3000 kg) 185-300 185-300
Hardness, Rockwell B ≥ 90 ≥ 90
Hardness, Rockwell C ≤ 40 ≤ 40

Thermal Properties

The thermal properties of Duranickel™ alloy 301 are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@21-100°C/69.8-212°F) 13.0 µm/m°C 7.22 µin/in°F
Thermal conductivity 23.8 W/mK 165 BTU in/hr.ft².°F

Fabrication and Heat Treatment

Annealing

Duranickel™ alloy 301 can be annealed for 5 minutes at 927°C (1700°F) and cooled rapidly.

Cold Working

Conventional methods are used for cold working Duranickel™ alloy 301. This alloy can be work hardened and intermediate annealing might be necessary based on the amount of cold work.

Hot Working

Duranickel™ alloy 301 can be hot worked between 1177-871°C (2150-1600°F).

Welding

Ordinary welding methods are recommended for Duranickel™ alloy 301. Welding takes place in the annealed condition followed by stress-relieving for ½ h at 843°C (1550°F). Formation of cracks is prevented by heating this alloy at 843°C (1550°F).

Forging

Duranickel™ alloy 301 can be forged between 1232-1038°C (2250-1900°F).

Forming

Duranickel™ alloy 301 can be formed by conventional methods and this alloy gains more strength when cold worked.

Machinability

Conventional methods are used to readily machine Duranickel™ alloy 301. This alloy can be machined in an easier manner in the age-hardened or cold worked condition. Usage of high-speed-steel cutting tools containing a high positive rake angle is recommended during the machining process.

Hardening

Duranickel™ alloy 301 can be hardened by aging or cold working.

Heat Treatment

Duranickel™ alloy 301 is annealed for about 5 minutes at 927°C (1700°F) and then rapidly quenched in water or cooled. This alloy is age-hardened for 16 h at 588°C (1090°F) followed by slow furnace cooling.

Applications

Duranickel™ alloy 301 is used in springs and in other electrical conductivity parts that require good fatigue strength and good thermal conductivity.

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