No.  An expired credit card is just like an expired library card.  You simply get a new one at the time of expiration.  Your credit card issuer should send you a new card in the mail automatically.  If you aren’t sure that this will happen, call to find out at least a few weeks before the expiration date on your card.  Once you get your new card, your credit line, balance, and interest rate should all be the same, unless you’ve been notified separately of changes in those areas.