A wind turbine steel tower ring segment, a wind turbine tower portion, a wind turbine tower, a wind turbine and a method for producing a wind turbine tower portion. A wind turbine steel tower ring segment for a wind turbine tower, comprising a shell segment with an extent in the direction of a segment height, of a segment ring direction and of a segment thickness and with a first horizontal joint side and a second horizontal joint side, a first vertical joint side and a second vertical joint side, wherein a first vertical flange is arranged at the first vertical joint side and / or a second vertical flange is arranged at the second vertical joint side, wherein the first vertical flange and / or the second vertical flange enclose(s) an angle with the shell segment, wherein at least one connection element for the arrangement of functional elements is formed on the first vertical flange and / or on the second vertical flange, wherein the connection element projects from the first vertical flange and / or the second vertical flange.