Perhaps someone more knowledgeable can comment but all my research indicates that the actual manufacturing technique of ancient ( not pattern welded) wootz/damascus/bulat steel are as if yet unknown to modern metalurgy. There have been many people who claim they "might have" rediscovered the tecnique but nothing definitive.
Once again maybe someone more knowledgeable can chime in.
The technique it is but unknown. J.Louis is one of the Master of the art that use it very well.
For your own curiosity you could go and read here:
http://www.tf.uni-kiel.de/matwis/amat/iss/index.html
(go to the Sword section...)
I also read a post where J.Louis explained with picture his crucible technique, but he himself could put you on the right track for collecting updated info.