High Quality Alloy Heat Treating Steel Bars - China

Heat treatment refers to a metal thermal processing process in which the material is in a solid state by means of heating, heat preservation and cooling to obtain the expected structure and properties.

In the process from the Stone Age to the Bronze Age and Iron Age, the role of heat treatment is gradually recognized by people.

heat treatment of steel

1 - Normalizing: The heat treatment process of heating the steel or steel parts to an appropriate temperature above the critical point AC3 or ACM for a certain period of time and then cooling in the air to obtain a pearlite structure.

2 - Annealing annealing: The hypoeutectoid steel workpiece is heated to 20-40 degrees above AC3, and after holding for a period of time, it is slowly cooled with the furnace (or buried in sand or cooled in lime) to a heat treatment process of cooling in air below 500 degrees.

3 - Solution heat treatment: heat treatment process in which the alloy is heated to a high temperature single-phase region and maintained at a constant temperature, so that the excess phase is fully dissolved into the solid solution, and then rapidly cooled to obtain a supersaturated solid solution.

4 - Aging: After solution heat treatment or cold plastic deformation, the properties of alloys change with time when they are placed at room temperature or kept slightly higher than room temperature.

5 - Solution treatment: fully dissolve various phases in the alloy, strengthen the solid solution, improve toughness and corrosion resistance, eliminate stress and soften, so as to continue processing and forming.

6 - Aging treatment: Heating and keeping the temperature at the precipitation temperature of the strengthening phase, so that the strengthening phase is precipitated, hardened, and the strength is improved.

7 - Quenching: A heat treatment process in which the steel is austenitized and then cooled at an appropriate cooling rate, so that the workpiece can undergo martensite and other unstable microstructure transformations in all or a certain range of the cross section.

8 - Tempering: A heat treatment process in which the quenched workpiece is heated to an appropriate temperature below the critical point AC1 for a certain period of time, and then cooled by a method that meets the requirements to obtain the required structure and properties.

9 - Carbonitriding of steel: Carbonitriding is the process of simultaneously infiltrating carbon and nitrogen into the surface of steel.

Traditionally, carbonitriding, also known as cyanidation, is widely used in medium-temperature gas carbonitriding and low-temperature gas carbonitriding (ie, gas soft nitriding).

The main purpose of medium temperature gas carbonitriding is to improve the hardness, wear resistance and fatigue strength of steel.

Low-temperature gas carbonitriding is mainly nitriding, and its main purpose is to improve the wear resistance and seizure resistance of steel.

10 - Quenching and tempering: The heat treatment that combines quenching and high temperature tempering is generally called quenching and tempering.

Quenching and tempering treatment is widely used in various important structural parts, especially those connecting rods, bolts, gears and shafts that work under alternating loads.

After quenching and tempering treatment, the tempered sorbite structure is obtained, and its mechanical properties are better than the normalized sorbite structure with the same hardness.

Its hardness depends on the high temperature tempering temperature and is related to the tempering stability of the steel and the size of the workpiece section, generally between HB200-350.

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• Posted By: Dongguan Songshun Mould Steel Co., Ltd.

• Phone: 0086 0769 85475596

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• Business Description: Established in 2009,Songshun Steel supplies a wide range of carbon, alloy and tool steel products, including high speed tool steel, cold work tool steel, hot work tool steel, plastic mould steel, engineering steel and machine structural steel etc.
  
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