Five types of heat treatment for ordinary carbon steel tube

Five types of heat treatment for ordinary carbon steel tube:

1. Normal hardening
Normalizing hardening is a method of heat treatment of ordinary carbon steel tube. Its main purpose is to improve the hardness and strength of the steel while enhancing the wear resistance and fatigue resistance of the steel. The normalizing hardening process includes: low-temperature heating → high-temperature heating → cooling. The operation method is to heat the carbon steel material to an appropriate temperature and then cool it below the ambient temperature at an appropriate speed. At this time, a brittle layer with higher hardness will form on the surface of the steel, while the interior will be a strong and tough material. Normalizing hardening technology is widely used to manufacture high-strength mechanical parts, such as shafts, gears, flanges, etc.

2. Annealing treatment

Annealing treatment is a method of heat treatment of ordinary carbon steel tube. Its main purpose is to reduce the hardness of the steel and improve the processability and toughness of the steel. The process flow of annealing treatment includes: heating → heat preservation → cooling. The operation method is to heat the carbon steel material to an appropriate temperature, hold it for a period of time and then slowly cool it. At this time, the grains of the steel are refined, the internal residual stress is eliminated, and the plasticity and toughness of the steel are improved. Annealing treatment technology is widely used in the manufacture of mechanical parts, tools, steel wire, etc.

3. Quenching treatment
Quenching treatment is a method of heat treatment of ordinary carbon steel tube. Its main purpose is to increase the hardness and strength of the steel and improve the wear resistance and corrosion resistance of the steel. The process flow of quenching treatment includes: heating → heat preservation → rapid cooling. The operation method is to heat the carbon steel material to an appropriate temperature and then quickly cool it to below room temperature. At this time, the surface hardness of the steel is higher, and the internal residual stress also increases, making the steel brittle. Quenching treatment technology is widely used in the manufacture of swords, springs, bearings and other mechanical parts.

4. Tempering treatment
Tempering treatment is a method of heat treatment of ordinary carbon steel tube. Its main purpose is to reduce the excessive hardness and brittleness of the steel after quenching and improve the toughness of the steel. The process flow of tempering treatment includes: heating → insulation → cooling. The operation method is the same as that of annealing treatment. At this time, the hardness and strength of the steel are retained to a certain extent, while the toughness is improved. Tempering treatment technology is widely used in the manufacture of forgings, screw rods, steel balls and other mechanical parts.

5. Surface carburizing treatment
Surface carburizing treatment is a method of heat treatment of ordinary carbon steel tube. Its main purpose is to increase the surface hardness and wear resistance of the steel. The process flow of surface carburizing treatment includes: heating → carburizing → quenching → tempering. The operation method is to first heat the carbon steel material to an appropriate temperature, and then contact the heated steel with a solid carbon source. The carbon atoms will be in the steel. Surface diffusion results in a thicker quenched layer. At this time, the surface hardness of the steel is higher, and the toughness is also improved to a certain extent. Surface carburizing technology is widely used in the manufacture of high-strength mechanical parts such as gears, pins, and machine tool guide rails.

Conclusion:

The five types of heat treatment of ordinary carbon steel tube are widely used in machinery manufacturing, and mastering these technologies is a basic skill for machining workers. This article introduces these five types in detail from four aspects: process flow, principle of action, operating methods and application scenarios. Readers should choose the appropriate heat treatment method according to specific needs to obtain the best results.

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