Super Alloy 35N (UNS R30035)

Topics Covered

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

Introduction

Super alloys or high performance alloys are of three types namely iron-based, cobalt-based and nickel-based alloys. These alloys can be strengthened by precipitation hardening, solid-solution hardening and work hardening methods.

Super alloys contain good oxidation and creep resistance and are available in varied shapes. These alloys can function under high mechanical stress and high temperatures and also in places that require high surface stability.

Super alloy 35N is a cobalt-nickel-chromium alloy. This alloy is age-hardenable and also contains molybdenum that makes it corrosion resistant. Very high strength can be obtained when a combination of aging and cold-working processes are performed on this alloy.

The following datasheet provides an overview of super alloy 35N.

Chemical Composition

The chemical composition of super alloy 35N is outlined in the following table.

Element Content (%)
Cobalt, Co 35
Nickel, Ni 35
Chromium, Cr 20
Molybdenum, Mo 9.80
Carbon, C 0.013

Physical Properties

The following table shows the physical properties of super alloy 35N.

Properties Metric Imperial
Density 8.41 g/cm3 0.304 lb/in3
Melting point 1416°C 2580°F

Mechanical Properties

The mechanical properties of super alloy 35N are displayed in the following table.

Properties Metric Imperial
Tensile strength 897 MPa 130000 psi
Yield strength (@strain 0.200 %) 517 MPa 75000 psi
Elongation at break 30% 30%
Reduction of area 35% 35%
Hardness, Brinell (estimated from Rockwell C value for Brinell test with 3000 kg load/10 mm diameter ball) 278 278
Hardness, Knoop (estimated from Rockwell C value) 301 301
Hardness, Rockwell C 28 28
Hardness, Vickers (estimated from Rockwell C value) 292 292

Other Designations

Equivalent materials to super alloy 35N are provided below:

  • AMS 5758
  • AMS 5844
  • AMS 5845
  • SPS M646

Fabrication and Heat Treatment

Annealing

Super alloy 35N can be annealed at 1066°C (1950°F) followed by cooling in a rapid manner.

Cold Working

Super alloy 35N has good ductility and can thus be cold formed by conventional cold working methods.

Welding

Super alloy 35N is capable of being welded using TIG method. Welding in the annealed state and low heat inputs provide good welding results for this alloy.

Forming

The high work hardening rate of super alloy 35N will reduce ductility during the forming process.

Hardening

Cold working and aging result in hardening of super alloy 35N.

Heat Treatment

Super alloy 35N is annealed at 1066°C (1950°F) followed by rapid air cooling. Age-hardening of this alloy takes place for 4 h at 566°C (1050°F) followed by air cooling.

Aging

Super alloy 35N is capable of being age-hardened.

Applications

Super alloy 35N is suitable for use in seawater applications, oil and gas well components containing hydrogen sulfide, and chemical process equipment.

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