Super Alloy Allvac 718 OP™

Dec 20 2012

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Applications

Introduction

Super alloys or high performance alloys are used at environments with very high temperature above 540ºC(1000ºF) where deformation resistance and high surface stability are chiefly required. They have good oxidation and creep resistance. Cobalt-base, nickel-base and iron-base alloys are the three major types of super alloys. The iron-base super alloys are generally wrought alloys provided with stainless steel technology. Nickel-base and cobalt-base super alloys may be cast or wrought based on its composition or application. Super alloys can be generally forged, rolled to sheet or produced in different shapes. Highly alloyed compositions are formed as castings. They can be strengthened using hardening techniques like work hardening, solid-solution hardening and precipitation hardening.

The following datasheet provides a detailed description of super alloy Allvac 718 OP™.

Chemical Composition

The chemical composition of super alloy Allvac 718 OP™ is listed in the following table.

Element Content (%)
Nickel, Ni 54
Chromium, Cr 19
Iron, Fe 17
Niobium, Nb (Columbium, Cb) 5.2
Molybdenum, Mo 3.1
Titanium, Ti 0.9
Aluminum, Al 0.5
Carbon, C 0.02

Physical Properties

The following table shows the physical properties of super alloy Allvac 718 OP™.

Properties Metric Imperial
Density 8.19 g/cm³ 0.296 lb/in³

Mechanical Properties

The mechanical properties of super alloy Allvac 718 OP™ are outlined in the following table.

Properties Metric Imperial
Tensile strength 1345 MPa 195100 psi
Yield strength (@0.2%) 1104 MPa 160100 psi
Elongation at break 22% 22%
Reduction of area 35% 35%
Hardness, Rockwell C 42 42

Applications

The following are the major applications of super alloy Allvac 718 OP™:

  • Subsurface safety valves
  • Packers
  • Side pocket mandrels
  • Valve gates
  • Valve seals
  • Valve stems
  • Valve seats
  • Fasteners, hangers
  • Blowout preventers
  • Fire safe valves
  • Well logging casing

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