Ok, this information is from The Master Bladesmith by Jim Hrisoulas. Preheat to a dark red, which is around 1200 degrees, and soak for about five minutes to anneal and relieve stress. Then slowly bring the steel up to 2000 degrees before starting forging. That would be a yellow color. Do not forge under 1700 degrees, which would be about a bright reddish orange. After forging take back up to 2000 degrees and cool in a hot box to anneal. You could possibly close it up in the hot forge to anneal also. A2, because it is an air hardening steel cannot be normalized. It is also very red hard and moves slowly under the hammer.
Doug