Steel does ×1 to Dragon

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

65 Steel and 70 Dragon species among the 1025 this site covers.

Attacker, Grass and Steel Kartana sprite

Kartana #0798

damage×1Generations VI to IX

Defender, Dragon Goodra sprite

Goodra #0706

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

Strongest Steel attackers

Kartana leads Steel at Atk 181

Sturdiest Dragon defenders

Dual types that change the answer