Super Alloy HAVAR (UNS R30004)

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
     Forming
     Welding
Applications

Introduction

Super alloys or high performance alloys have an ability to function at temperatures above 540ºC(1000ºF) with deformation resistance and high surface stability. As they have good oxidation and creep resistance, super alloys can be commonly forged, rolled to sheet or produced in various shapes. Iron-base, nickel-base and cobalt-base alloys are the major types of super alloys. Nickel-base and cobalt-base super alloys may be cast or wrought based on its composition or application. The iron-base super alloys are generally wrought alloys with stainless steel technology. These alloys can be strengthened by precipitation hardening, work hardening and solid-solution hardening.

HAVAR is a heat-treatable cobalt-base alloy, which has excellent corrosion resistance and high strength at elevated temperatures.

The following datasheet provides a detailed description of super alloy HAVAR.

Chemical Composition

The following table shows the chemical composition of super alloy HAVAR.

Element Content (%)
Cobalt, Co 41-44
Chromium, Cr 19-21
Nickel, Ni 12-14
Tungsten, W 2.3-3.3
Molybdenum, Mo 2-2.8
Manganese, Mn 1.35-1.8
Carbon, C 0.17-0.23
Beryllium, Be 0.02-0.06
Iron, Fe Balance

Physical Properties

The physical properties of super alloy HAVAR are given in the following table.

Properties Metric Imperial
Density 7.7-8.03 g/cm³ 0.278-0.290 lb/in³
Melting point 1480ºC 2696ºF

Mechanical Properties

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

Properties Metric Imperial
Tensile strength 1158 MPa 16795 psi
Yield strength 1034 MPa 14996 psi
Modulus of elasticity 190-210 GPa 27557-30457 ksi
Poisson's ratio 0.27-0.30 0.27-0.30
Elongation 15% 15%
Reduction in area 53% 53%
Hardness 335 335

Thermal Properties

The thermal properties of super alloy HAVAR are displayed in the following table.

Properties Conditions
T (ºC) Treatment
Thermal conductivity 42.7 W/mK 100 -

Fabrication and Heat Treatment

Forming

Tools with large radii are required for forming HAVAR.

Welding

Welding of HAVAR can be performed using common soldering and welding techniques.

Applications

The following are the major applications of super alloy HAVAR:

  • Springs
  • Diaphragms
  • Target foils for nuclear physics.

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