Yes, IRONS is a Scrabble word!

Letter values in Scrabble US: I 1, R 1, O 1, N 1, S 1.

Is it a valid word?

IRONS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

metal shackles; for hands or legs
a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood
a golf club that has a relatively narrow metal head
implement used to brand live stock
home appliance consisting of a flat metal base that is heated and used to smooth cloth

Also: atomic number 26, branding iron, smoothing iron, iron out.