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Annealing Heat Treating

Annealing is a type of heat treatment that alters the microstructure of a material causing changes in properties such as strength and hardness and ductility. Bluewater's process takes place in stages. First is the softening of the metal through the removal of crystal defects and the internal stresses they cause. Second, is the ncleation and growth of new, strain-free grains.  

Annealing Process
To avoid oxygenation, scaling and decarburization, Bluewater can carry out the annealing process in protective inert atmospheres such as endothermic gas, hydrogen gas, nitrogen gas, argon gas, or vacuum. Components to be annealed are heated in production furnaces and then slow cooled under a controlled environment.

Air atmosphere annealing is also a low cost option for raw material and unfinished parts where decarburization and scaling is permitted. Bluewater's facility in Houston, TX specializes in air atmosphere annealing of long raw material products such as bars, tubes, plates, and blocks for the oil and gas industry.

Annealing of castings and forgings in protective atmosphere using large roller hearth furnaces is a specialty of Bluewater's facilities in Chicago, IL. Truckloads of castings and forgings are annealed each day at very competitive rates.

Bright annealing of stainless steel for high production volume quantities using continuous mesh belt furnaces is a specialty of Bluewater's facilities in Coldwater, MI and Chicago, IL. These furnaces are able to produce brighter parts with more uniform heating and cooling rates at lower prices than vacuum furnaces.

Annealing Properties
  • Reduces hardness, tensile strength and yield strength
  • Allows for easier machining and forming of materials
  • Removes residual stresses present
  • Removes effects of cold-work hardening
  • Recrystallization can eliminate directionality of rolled or forged microstructures and create fine equiaxed grains
  • Homogenization of grain structure to dissipate alloy segregation present in as-cast structures
Annealing Applications
  • Shaping
  • Stamping
  • Forming
  • Hydroforming
  • Bending
  • Machining
  • Castings
  • Forgings
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