High carbon steel is often called tool steel, mainly used for manufacturing cutting tools.The carbon content ranges from 0.60% to 1.70%. It is characterized by being hard and brittle and can be quenched.Cutting tools such as drills, taps and reamers are made of steel with a carbon content of 0.90% to 1.00%.High hardness (HRC60-65) and better wear resistance can be obtained after heat treatment.
2. Moderate hardness in annealing state, with good machinability.
3. Easy access to raw materials and low production cost.
High carbon steel.High - carbonsteel
Properties: carbon steel with a carbon content of more than 0.6%, commonly used carbon content of 0.60% ~ 1.50%. In addition to carbon, it can also contain a small amount of manganese (0.70% ~ 1.20%), such as 65Mn (spring steel).
High carbon steel belongs to high quality carbon steel or high quality carbon steel, such as T8A (carbon tool steel).
All kinds of parts made of high carbon steel generally have to go through different forms of heat treatment before use.
Because of the high carbon content, high hardness (HRC55 +) and good wear resistance can be obtained after heat treatment.
Carbon tool steels are often used for hand tools such as taps, files, etc.
Due to the poor red hardness of carbon tool steel, the hardness will drop sharply after heating, so it is not suitable for the production of parts that will produce high heat.
High carbon steel rusts more easily than ordinary steel.
Welding of high carbon steel
High carbon steel has poor welding performance due to its high carbon content.Its welding has the following characteristics :(1) poor thermal conductivity, significant temperature difference between the welding area and the unheated part, when the melting pool is cooled sharply, the internal stress caused in the welding seam is easy to form cracks.
(2) it is more sensitive to quenching, and it is easy to form martensite structure in the near seam area.Due to the action of the tissue stress, the cold crack appears in the near crack area.
(3) due to the influence of welding temperature, the grain grows fast, and the carbide is easy to accumulate and grow on the grain boundary, resulting in the fragile welding seam and reduced welding joint strength.
(4) when welding high carbon steel, it is easier to produce heat crack than medium carbon steel.