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Steel or metal credit cards are not different from plastic credit cards, except that they are made of metal, not plastic. Say you have a plastic card and the issuer offers a metal version of your card. So if you switch your card to the metal version, the card terms will stay the same.
However, since most metal credit cards are designed for people with perfect credit, they can offer more benefits, including luxury perks. Many luxury credit cards are metal credit cards too. And luxury cards can come with higher credit limits and offer better rewards (including protections, insurances, and VIP services).
As for the interest rates, they usually depend on your credit score and creditworthiness. So the better your credit is, the lower APR you can get. Just keep in mind that with all the benefits, metal credit cards can charge high annual fees.