1020 Carbon Steel
1020 carbon steel 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. Formability is good by all conventional methods as the ductility of 1020 carbon steel is good.
AISI 1020 carbon steel has low hardenability properties and is a low tensile carbon steel with a Brinell hardness of 119 – 235, and a tensile strength of 410-790 MPa. It has high machinability, high strength, high ductility and good weldability. It is normally used in turned and polished or a cold drawn condition. Due to its low carbon content, it is resistant to induction hardening or flame hardening. Due to lack of alloying elements, it will not respond to nitriding.
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The chemical composition of AISI 1020 carbon steel is outlined in the following table.
① When carbon steel is required to specify the Si content, it is usually selected according to the following five grades: Si≤ 0.10%, 0.10%~0.20%, 0.15%~0.35%, 0.20%~0.40%, 0.30%~0.60%.
② When the content of copper and Cu is specified for carbon steel, Cu ≥ 0.2%.
③ When it is necessary to add lead Pb element to the standard steel, the specified range is 0.15%~0.35% (including 0.35%). Such steel is identified by inserting the letter L between the second and third digits of the grade name, for example 10L45. When lead Pb was added to the ladle, no thermal analysis was performed.
④ When boronization of killed steel is specified, the content of boron in the steel should reach 0.0005%~0.003%. Steel containing titanium is not allowed, and the upper limit of boron content can reach 0.005%.
⑤ When the supply and demand sides reach an agreement, bismuth, calcium, selenium or tellurium can be added to carbon steel.
ASTM AISI SAE 1020 carbon steel equivalent material to European EN (Germany DIN EN, British BSI, French NF…), Chinese GB and Japanese JIS standard.
High quality carbon structural steel
Tensile Strength Mpa
Yield Strength Mpa
Reduction of area %
500 - 650
Quenched and tempered
>16 – 40
470 - 620
>16 – 100
In the cold drawn or turned and polished condition, 1020 carbon steel has high machinability. Following the recommendations of machine manufacturers, 1020 carbon steel can be used for drilling, turning, milling and tapping operations using suitable feeds, tool type and speeds.