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C-20
C20 carbon steel is an unalloyed low carbon mild steel gradesupplied as a hot rolled or bright drawn finish bar. As a lowcarbon steel grade, it provides low strength with goodmachinability and is suitable for welding.
Chemical composition
The following table shows the chemical composition of C20 steel.
Heat Treatment
When hardening C-20 heat treatment temperatures, including the rate of heating, cooing, and soaking times will vary due to factors such asthe shape and size of each component. Other considerations during the heat treatment process include the type of furnace, quenching medium, and workpiece transfer facilities.
Hardening
As a low carbon steel C-20 is not idealy suited for heat treatment EN8 or EN9 may be a better-suited optionllf hardenino is reouired heat oa temperature of 880-910°C. Quench in water and temper.
Machinability
Surface rippind is more evident in EN3 so lubrication is essential. Fairly high surface speeds should be used with moderate feeds. screwcutting is easy with cutting oil and achieving a fine finish is achieved with slight polishing very nice to weld with good flow and strenath.
Annealing
C-20 is commonly supplied bright drawn or as rolled. lf annealing is required heat to 880-910°C, furnace cool.
Application
Commonly used for general engineering C-20 is suitable for applications such as bolts, shafts, spacers, hubs, base plates, brackets, fixtures and jigs.
