I have a shower curtain that is made of material like I assume this is and I have never been able to get the creases out since I have it about 5 years. I didn’t try ironing it because I am also certain it would melt no matter how careful I was.

I have tried washing it in hot/cold water, tumble drying, hanging dry etc. And it spends 100% of life hanging in a poorly ventilated bathroom. So 100s of steamings.

OTOH I can recommend, if you would benefit from a large world map in your home but don’t have a whole wall to spare, shower curtain world map comes in very handy.