Super Alloy Nicrofer 7016 TiNb (UNS N07750)

Topics Covered

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

Introduction

Nicrofer 7016 TiNb alloy is a precipitation hardenable nickel-chromium-iron alloy that contains aluminum, niobium and titanium and exhibits good corrosion resistance at high and low temperatures. It also offers high strength at temperatures up to 820°C (1510°F) and excellent mechanical properties in cryogenic environments.

The following datasheet will provide an overview of nicrofer 7016 TiNb alloy.

Chemical Composition

The chemical composition of nicrofer 7016 TiNb alloy is outlined in the following table.

Element Content (%)
Chromium, Cr 14-17
Iron, Fe 5-9
Titanium, Ti 2.25-2.75
Manganese, Mn 1
Niobium, Nb 0.7-1.2
Copper, Cu 0.5
Silicon, Si 0.5
Aluminum, Al 0.4-1
Carbon, C 0.08
Sulfur, S 0.01
Nickel, Ni Balance

Physical Properties

The following table shows the physical properties of nicrofer 7016 TiNb alloy.

Properties Metric Imperial
Density 8.2 g/cm3 0.296 lb/in3
Melting point 1390-1430°C 2540-2600°F

Mechanical Properties

The mechanical properties of nicrofer 7016 TiNb alloy are displayed in the following table.

Properties Metric Imperial
Tensile strength (Solution treated) 782 MPa 113 ksi
Yield strength (Solution treated) 391 MPa 57 ksi
Elongation at break (Solution treated) 42% 42%

Thermal Properties

The thermal properties of nicrofer 7016 TiNb alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@100°C/212°F) 13.2 µm/m°C 7.3 µin/in°F
Thermal conductivity (@20°C/68°F) 10.5 W/mK 73 BTU.in/hrft².°F

Fabrication and Heat Treatment

Machinability

Conventional machining techniques that are used for machining iron-based alloys can be used.

Forming

Nicrofer 7016 TiNb alloy has excellent ductility, and can be readily formed by all conventional techniques.

Welding

The alloy can be welded using commonly used welding techniques such as gas-tungsten arc welding, shielded metal-arc welding, gas metal-arc welding and submerged-arc welding.

Heat Treatment

Nicrofer 7016 TiNb alloy can be heat treated at temperatures ranging from 885 to 1149°C (1625 to 2100°F).

Forging

Forging can be readily accomplished in the temperature range of 1038 to 1204°C (1900 to 2200°F).

Hot Working

The alloy can be hot worked in the temperature range of 982 to 1204°C (1800 to 2200°F).

Cold working

Cold working may be performed using standard tooling.

Annealing

The alloy is annealed at 982 to 1093°C (1800 to 2000°F) followed by air cooling.

Other Designations

Other designations that are equivalent to nicrofer 7016 TiNb alloy include the following:

AISI 688 AMS 5669 DIN 2.4669
AMS 5542 AMS 5670 DIN 2.4699
AMS 5582 AMS 5671 GE B50TF1232
AMS 5583 AMS 5698 GE B50YP44
AMS 5598 AMS 5699 MIL N-24114
AMS 5667 AMS 5747 MIL N-7786
AMS 5668 ASTM B637 MIL S-23192

Applications

The following are the list of applications of nicrofer 7016 TiNb alloy:

  • Thrust reversers and ducts of gas turbines
  • Cryogenic vessels
  • Heat treat fixtures
  • Springs and fasteners.

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