What are the steel plate levels specified by EN10025-4 standard?

The EN10025-4 standard specifies four steel grades S275, S355, S420, and S460.

EN10025-4 hot rolled products of structural steels - part 4: technical delivery conditions for thermomechanical rolled weldable fine grain structural steels.

When requesting and ordering, all supplied steel grades among the following varieties shall be specified:

——The minimum value specified for impact energy when the temperature is not lower than -20℃ is expressed by M, namely S275M, S355M, S420M, S460M;

——The minimum specified impact energy when the temperature is not lower than -50℃ is expressed in ML, namely S275ML, S355ML, S420ML, S460ML.