Why use sodium cyanate for heat treatment?
Steel is a widely used metal in industry, and the microstructure of steel is also the most complex, so there are many kinds of heat treatment process. Metal heat treatment process can be generally divided into three categories: overall heat treatment, surface heat treatment and chemical heat treatment. Why is sodium cyanate preferred for heat treatment of steel parts?
The purpose of preliminary heat treatment is to improve processing performance, eliminate internal stress and prepare good metallographic structure for final heat treatment. The heat treatment process includes annealing, normalizing, aging, tempering, etc.
1. annealing and normalizing
Annealing and normalizing are used for hot worked blanks. For carbon steel and alloy steel with carbon content more than 0.5%, in order to reduce their hardness and be easy to cut, annealing treatment is often used; for carbon steel and alloy steel with carbon content less than 0.5%, normalizing treatment is used to avoid sticking when cutting with low hardness. Annealing and normalizing can refine the grain and even the structure, which can prepare for the later heat treatment. Annealing and normalizing are usually arranged after the rough manufacturing and before the rough machining.
2. aging treatment
Aging treatment is mainly used to eliminate the internal stress produced in blank manufacturing and machining. In order to avoid too much transportation work, for parts with general accuracy, it is enough to arrange an aging treatment before finishing. However, for parts with high accuracy requirements (such as the box of coordinate boring machine), two or more aging treatment procedures shall be arranged. Aging treatment is generally not required for simple parts.
In addition to castings, for some precision parts with poor rigidity (such as precision lead screw), in order to eliminate the internal stress generated in processing and stabilize the processing accuracy of parts, multiple aging treatments are often arranged between rough machining and semi finish machining. Some shaft parts processing, in the straightening process also need to arrange aging treatment.
(3) tempering
Quenching and tempering is to carry out high temperature tempering treatment after quenching. It can obtain uniform and fine tempered sorbite structure, which is prepared for reducing deformation during surface quenching and nitriding treatment. Therefore, quenching and tempering can also be used as preparatory heat treatment. Due to the better comprehensive mechanical properties of the parts after quenching and tempering, some parts with low hardness and wear resistance requirements can also be used as the final heat treatment process.
Therefore, sodium cyanate is a high-quality method for heat treatment of steel parts penetrating into metal surface. The function of using sodium cyanate is to improve the mechanical properties of materials, eliminate the residual stress and improve the machinability of metals, even to improve the hardness, wear resistance, fatigue strength and corrosion resistance of parts surface.
The purpose of preliminary heat treatment is to improve processing performance, eliminate internal stress and prepare good metallographic structure for final heat treatment. The heat treatment process includes annealing, normalizing, aging, tempering, etc.
1. annealing and normalizing
Annealing and normalizing are used for hot worked blanks. For carbon steel and alloy steel with carbon content more than 0.5%, in order to reduce their hardness and be easy to cut, annealing treatment is often used; for carbon steel and alloy steel with carbon content less than 0.5%, normalizing treatment is used to avoid sticking when cutting with low hardness. Annealing and normalizing can refine the grain and even the structure, which can prepare for the later heat treatment. Annealing and normalizing are usually arranged after the rough manufacturing and before the rough machining.
2. aging treatment
Aging treatment is mainly used to eliminate the internal stress produced in blank manufacturing and machining. In order to avoid too much transportation work, for parts with general accuracy, it is enough to arrange an aging treatment before finishing. However, for parts with high accuracy requirements (such as the box of coordinate boring machine), two or more aging treatment procedures shall be arranged. Aging treatment is generally not required for simple parts.
In addition to castings, for some precision parts with poor rigidity (such as precision lead screw), in order to eliminate the internal stress generated in processing and stabilize the processing accuracy of parts, multiple aging treatments are often arranged between rough machining and semi finish machining. Some shaft parts processing, in the straightening process also need to arrange aging treatment.
(3) tempering
Quenching and tempering is to carry out high temperature tempering treatment after quenching. It can obtain uniform and fine tempered sorbite structure, which is prepared for reducing deformation during surface quenching and nitriding treatment. Therefore, quenching and tempering can also be used as preparatory heat treatment. Due to the better comprehensive mechanical properties of the parts after quenching and tempering, some parts with low hardness and wear resistance requirements can also be used as the final heat treatment process.
Therefore, sodium cyanate is a high-quality method for heat treatment of steel parts penetrating into metal surface. The function of using sodium cyanate is to improve the mechanical properties of materials, eliminate the residual stress and improve the machinability of metals, even to improve the hardness, wear resistance, fatigue strength and corrosion resistance of parts surface.
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