What is the hardness of ST52-3 steel?

The hardness of ST52-3 steel, also known as S355J2 or 1.0570 steel, can vary depending on the heat treatment and processing conditions. Generally, the hardness of ST52-3 steel falls within the following range:

As-Rolled Condition: In its as-rolled condition without any heat treatment, ST52-3 steel typically exhibits a hardness ranging from approximately 180 to 220 HB (Brinell Hardness).

After Heat Treatment:

Normalized: The hardness may increase slightly after normalization, but typically remains within a similar range as the as-rolled condition.

Quenched and Tempered: Through quenching and tempering processes, the hardness of ST52-3 steel can be significantly increased, reaching values between 500 and 700 HB depending on the specific heat treatment parameters.

For precise hardness values of ST52-3 steel in your application, it is recommended to consult the material specifications, manufacturer's data, or conduct hardness testing based on the specific heat treatment and processing history of the steel in question.