Can steel go inside sun with carbon..

Carbon NEVER breaksdown into hydrogen and helium. Steel is an alloy of iron that contains carbon. Send either into the sun and they go from being a solid to a liquid to a gas to a plasma as the temperature increases on its approach but neither breaksdown into something else. Carbon as a solid or a plasma is still carbon and the same is true for iron.
There are small amounts of most elements in the sun but it is mostly hydrogen.

Carbon is an element, which is your first oversight.
http://en.wikipedia.org/wiki/Carbon

The rest of you statements are not clearly presented. Let alone make any sort of sense.

dickinabox

I don't know, go try it and come back and let us know how things went.