Traditional Services

Advanced Heat Treat Corp. offers an array of services, including those considered "traditional" or "conventional".

Carburizing

Carburizing is a surface or case hardening process normally applied to low-carbon steel alloys. During processing, carbon is diffused into the surface of the parts at elevated temperatures. Hardening occurs to this "carburized case" by quenching in oil from above the transformation range resulting in a hard surface for wear resistance and a soft core for ductility.

  • Hard and high wear resistance surface
  • Deep case depth potential
  • Improves durability

Carbonitriding

Carbonitriding is a modified form of gas carburizing in which ammonia is added to the carburizing atmosphere. Thus, both carbon and the nitrogen from the ammonia are diffused into the steel simultaneously. The diffusion of carbon results in a high carbon surface while the nitrogen provides extra hardness. Carbonitriding produces a shallower case and is well suited for plain, low-carbon steels.

  • Improves fatigue resistance
  • High surface hardness and tough core with low cost material
  • Improves wear resistance

Through Hardening/Quench & Temper

Through Hardening/Quench & Temper is for hardening medium carbon alloy steel. This consists of heating the parts to a temperature above the transformation range and rapid cooling to room temperature, usually using an oil quench. This may be performed in air or in a controlled atmosphere to protect the part's surface. Parts are then reheated to a lower temperature to temper to the desired final hardness range.

  • Improves strength and hardness
  • Controllable specific mechanical properties
  • Same hardness throughout part
  • Increases lifespan of part

Age/Precipitation Hardening

Age/Precipitation Hardening is performed after solution treating of precipitation hardening (PH) grades of stainless steel. When PH stainless steels are heated between 900ºF and 1200ºF, secondary phase particles precipitate out of the previously formed solid solution. These particles serve as a strengthening and hardening mechanism.

Annealing (Sub-critical)

Sub-critical annealing is a treatment used to soften steel, improve its ductility, reduce brittleness and relieve stresses.  The parts are heated to below the A1 (critical) temperature, then slow-cooled to room temperature.  This process is frequently used on parts which have been flame/plasma/laser cut, as it greatly improves the machinability of the areas affected by the cutting process.

Cold Treatment

Cold Treatment is performed by exposing heat treated material to a subzero temperature, typically between -80ºF and -120ºF. This process reduces or eliminates the amount of retained austenite from the quenching process by transforming it to a martensitic state. Cold Treatment results in increased strength, dimensional stability, and relief of stress.

Normalizing

Normalizing is the treatment of steel by heating above the transformation temperature, holding for a certain time, and then cooling to room temperature in still or slightly agitated air. This is done to remove processing stress and provide a more uniform structure.

Stress Relieving

Stress Relieve is a process using controlled heating and cooling to relieve machining or welding stress from large parts or weldments. Time and temperature relationships are developed based on prior hardness requirements or by the size and complexity of weldments. Stress Relieve will minimize part distortion during subsequent heat treatment or while in service.

Tempering/Drawing

Tempering/Drawing is a softening process of ferrous alloys or metals. Typically, this procedure follows another form of heat treat process (i.e. UltraGlow® Induction Hardening, Carburizing, Carbonitriding, etc.) and brings the material back to its respective target hardness specification. This process allows the part to maintain its toughness, strength and ductility.

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