That should be hot enough for forging most spring and tool steels. I would think that only some of the more complex steels that need to be worked up around welding temperature would give you problems. As for having to do "extra" heats, there are two schools of thought. One is that it is better to do more cycles at lower temperature and work the steel for more but shorter cycles to suppress grain growth. The other is to get the steel hotter where it will move faster and work longer and correct for the grain growth later. This will, of course, depend on the specific steel being forged.
Doug Lester