The material strengths (i.e., steel grade strengths) to be used with PN-EN 1993-1-1 are given in Table 3.1 of the code. The Polish National Annex states in Cl. 3.1(2) that the steel grades to be used will be based on Table 3.1 of PN EN 1993-1-1. These steel grade values are specified using the SGR parameter (Refer to D5.C.6 Design Parameters).