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Other Technologies


  Glass Beading Sand Blasting  Clamp Tempering 
  Shot Blasting or Peening  Straightening  Cryogenic Treatment / Freezing


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Glass Beading


The surface of metal components may be cleaned by impingement of a jet of glass beads. Nitrex will use this technique occasionally when sand blasting would be considered too rough.

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Shot Blasting or Peening


When tiny steel balls are used the process of blasting parts using this medium will be called shot blasting or peening. Jets of shot are aimed at components while they tumble in a rotating chamber. Some differentiate between "blasting" or "peening", but the process is the same nevertheless. The former expression is used when the objective is to clean the parts or remove sharp edges, while the latter indicates a desire to mechanically compress the surface layer of the material. In this manner compressive stresses are introduced which in most cases will improve the fatigue resistance of the component.

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Sand Blasting


Sand blasting is used primarily to remove rust, paint, scale or significant blemishes on the surface of components. Depending on the need, the technique is used either before heat treatment (preparation) or after (e.g., removal of oxidation).

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Straightening


Certain types of components, particularly longer objects such as shafts, tend to distort in high temperature treatment. In most cases they can be successfully straightened using special hydraulic presses.

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Clamp Tempering


Heat treatment is inherently distorting to the parts. To reduce distortion some components must be restrained during tempering by being "clamped", and process is then called clamp tempering.

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Cryogenic Treatment / Freezing


 

After a successful quench and temper, it is frequently desirable to subject the work piece to a cryogenic treatment, also referred to as freezing (or sub-zero freezing). This process induces carbide particles to precipitate into voids in the iron lattice, thus creating a denser, more stabilized structure that reduces friction, wear and thermal softening.

 

Summary of Benefits:

 

  • Conversion of retained austenite (soft) into martensite (hard)
  • Increased strength, toughness, stability and durability
  • Increased density of the steel structure
  • Lower coefficient of friction
  • Decreased residual stresses and brittleness
  • Significantly improved abrasive wear resistance

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