Steel does ×1 to Normal

Generations VI to IX, single types. The other way round, Normal against Steel, is ×½.

65 Steel and 131 Normal species among the 1025 this site covers.

Attacker, Grass and Steel Kartana sprite

Kartana #0798

damage×1Generations VI to IX

Defender, Normal Blissey sprite

Blissey #0242

Steel did not exist in Generation I, so Steel against Normal has no value there.

Strongest Steel attackers

Kartana leads Steel at Atk 181

Sturdiest Normal defenders

Dual types that change the answer