Thanks folks for the input and the welcome. I will try and get a photo when the bikes delivered, I was trying to get a little info in advance.
From what I can gather from the bikes age the dropouts will be either a standard steel vertical dropout with mech hanger integrated or a more traditional forward facing sliding drop with hanger. So defo steel and with the dropout and hanger as one piece.
To be more specific I am more after metallurgy advice such as will heat be useful or as unterhausen suggests there will be no benefit.
Cheers