Case Hardening Steel
Case-hardening steels are low carbon, alloyed or unalloyed steels that are used for manufacturing of parts that are resistant to variable and impact loads where hard and wear-resistant properties in the surface as well as softer and firm properties in the core are desired.
The carbon content of case-hardening materials is approximately in the range of 0.10% to 0.20%, and in some varieties it can increase up to 0.25%. They can be manufactured with or without alloy.
The case-hardening process improves surface hardness wear resistance and continuous strength, and it also improves core region strength and ductility. In this way, it would be possible to carry big loads and meet impact loads.
The component may gain such properties by ensuring that carbon content is absorbed into the steel surface. Case-hardening steels are used for manufacturing of items such as gears, shafts, piston pins, chain links, sprockets and pulleys, discs, guide bearings, roller bearings, rollers, some measurement and control devices, medium forced or forced parts, parts formed by cold heading or jetting (extrusion), cutting tools etc.
Use of case-hardening steels provides more advantages compared to high carbon steels which would provide the same hardness value on the surface:
- Since the case-hardening process is implemented after the part has taken its final form either partially or fully, then it would be quite easy to process that part.
- If there are sections on the parts that will be machined later and they don’t need to harden, these sections are covered by a special paste or electrolytic copper. The case-hardening process cannot affect these areas, so they can be processed later easily.
- Since the core section maintains its softness after completion of the case-hardening process, warping rarely occurs.
- The inner parts of case-hardening steels can be easily processed.
- Case-hardening steels are cheaper than high carbon steels that can provide the same hardness on the surface and are generally tool steels.
Intended Use and Specification of Case-Hardening Steels :
They are used for manufacturing parts like gears, shafts, piston pins, chain links, sprockets and pulleys, discs, guide bearings, roller bearings, rollers, some measurement and control devices, medium forced parts, cutting tools etc.