You should get access to any SkyTeam lounges (operated by SkyTeam member airlines or the "unified" SkyTeam lounges that have started to appear in a few airports such as LHR), assuming that airport security arrangements permit you to get to the door, based on SkyTeam policies and your international business class ticket. Check rules on the SkyTeam website to verify this.
A business class ticket also gives you the SkyPriority handling "package" such as special lines where applicable and relatively early boarding.