GB/T699 20# Carbon Steel is a low hardenability and low tensile carbon steel with Brinell hardness of 119 - 235 and tensile strength of 410 - 790 MPa. This standard has high machinability, high ductility, high strength, and good weldability. Due to its low carbon content, it is resistant to the induction hardening or flame hardening and lack of alloying elements, it will not respond to nitriding. Although, carburization is possible in order to obtain case hardness more than Rc65 for smaller sections that reduce with an increase in section size. Core strength will remain as it has been supplied for all the sections.
GB/T699 20# Carbon Steel steel is largely used in all industrial sectors in order to improve weldability or machinability properties. It is used in a variety of applications due to its cold drawn or turned and polished finish property.
Chemical Composition GB/T699 20# Carbon Steel | |
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Element | Content |
Carbon | 0.17% - 0.230% |
Iron, Fe | 99.08 - 99.53% |
Manganese, Mn | 0.30% - 0.60% |
Phosphorous, P | ≤ 0.40% |
Sulfur, S | ≤ 0.050% |
Heat Treatment GB/T699 20# Carbon Steel | |
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Normal Temp | 1634° - 1724° F. |
Anneal Temp | 1600° - 1800° F. |
Hard Temp | 1500° - 1600° F. |
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