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
- Non-magnetic properties
- High fatigue resistance
- 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:
- Medical implants
- Target foils
- Pressure sensing diaphragms in process control equipment
- Particle beam windows in nuclear physics
- Lends well to heat treating, welding, soldering, 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