Havar Chemical Etching

Havar is a precipitation hardening “super-alloy” composed of 41-44% Cobalt, 19-21% Chromium, 12-14% Nickel, 2.3-3.3% of Tungsten, 2-2.8% Molybdenum, 1.35-1.8% Manganese, .17-.23% Carbon, and .02-.08% Beryllium. Havar chemical etching is done for various applications including springs, diaphragms, and target foils for nuclear physics.

It is valued for its retained strength in high temperatures, anti-corrosive properties, and heat treatability. The medical industry prefers Havar due to its biocompatibility and non-magnetic properties.

Havar Chemical Etching

Fotofab’s etching process produces designs that can withstand harsh indoor and outdoor environments. The process uses a strong caustic chemical to etch into unprotected parts of a metal surface to create a design or image formed to your project’s specifications.

Characteristics of Havar

Havar can be hardened by cold work, heat treatment, or both and features:

  • Very high mechanical strength
  • Corrosion-resistance
  • Non-magnetic properties
  • High fatigue resistance
  • Biocompatibility
  • Tensile strength of 960-970 MPa
  • Modulus of elasticity of 200-210 GPa

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Acid Etching for Havar Parts Applications

Havar of various thicknesses is used in a variety of high-temperature applications, including:

  • Pressure sensing diaphragms in process control equipment
  • Particle beam windows in nuclear physics

Other Factors

  • Lends well to heat treating, weldingsoldering, and brazing
  • Havar will maintain 75% of its strength up to 950 °F, with a melting point of 2696 °F
  • Havar outperforms 316L Stainless Steel in resistance to pitting corrosion and crevice corrosion in medical implant environments
  • Originally developed in the late 1940s as an alloy for the mainsprings used in watches
  • In cold-rolled and aged form, its yield tensile strength is higher than other cobalt-implant alloys
  • Also known as UNS R30005
  • Havar is frequently used as window materials for high-energy proton beams used in the production of fluorine-18 from oxygen-18 enriched water
  • Havar does not corrode at all at room temperature, it starts corroding rapidly (15 mm/year) at 70°C, and reaches a rate of 56 mm/year at its boiling point

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