My pipe is stuck help!!

Hey everyone well heres how it is. My pipe is fairly old, and where i live in australia, its illegal to buy paraphenalia so i have to cherish whatever equipment i have. basically the connector from the chamber to the bowl is stuck and no matter what i do i can't get it off to clean it. I have put it in a vice(youll see the damage below lol), tried wd40, metal lubricant, EVERYTHING and it just wont come off..ive tried heating it up too. any clues guys i really need to get this off and clean it as its blocking up almost every sesh and getting really annoying thanks guys

Tried freezing it then quickly heating just the brass? What are you heating it with? It's probably "welded" due to galvanic reaction between the aluminum (or aluminium) and the brass. Heating the brass only may enlarge hole enough to gently twist it out. Aluminum gets soft - real soft - at 435F. Wrap a wet cloth or chamois around the aluminum to keep it cooled.

And try it with slip joint pliers, or curved jaw Vise Grips so you can tell how much pressure you are putting on it. In using the vise already, you may have already squeezed too hard and deformed both metals.
(Use something with curved jaws so that you will have more contact area with less pressure)

Shove a bent paperclip in it, yo!

smoke a joint, buying rolling papers aint illegal......

If its not welded together as stated above , you may try boiling it in water for a while , I have had to do this with old dried up pot pipes .. Some still smoke the watery resins but resin smoking is for children & Desperate

Assuming it was gunk that kept it stuck together, I would try a gun cleaning solvent ike Hoppes 9 or even Easy Off oven cleaner.