1020 Steel, showing the properties of http://www.metalsuppliersonline.com/research/property/metals/819.asp


Chemistry Data


Carbon
0.17 - 0.23

Iron
Balance

Manganese
0.3 - 0.6

Phosphorus
0.04 max

Sulphur
0.05 max


General Information


Principal Design Features

1020 is one of the very commonly used plain carbon steels. It has a nominal carbon content of 0.20% with approximately 0.50% manganese. It is a good combination of strength and ductility and may be hardened or carburized.


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Applications

1020 steel is used for simple structural application such as cold headed bolts. It is often used in the case hardened condition.

"It is just old hard iron." This is an answer they give you when they don't know. Underneath that .003-5 case is nicely machined steel.

David