I read all the urban legends about liquid this and liquid that, ammonia, vinegar, liquid wrench, yadi, yadi, yah.
I'm not a metallurgist, but... I had this issue with bikes that have had seat stems, handlebar stems and pedals that seemed like they were welded to the bike, mainly because the metals were different and they had never been loosened or removed. I live in an area where the temps rarely dip below the teens (F not C) during winter. Sitting in my house one winter's day with the temps (F) in the single digits, I heard "pops" - it was the deck screws and siding fasteners "shrinking". metal shrinking?????
I left my bike out in the cold overnight - again, it was single digit cold - and the next morning the stem came right out - with all the **** I poured down the bike frame, what a waste. This also worked for a pedal that was "fused" to the crank arm for over 15 years. Get it cold, well below freezing, and let it sit for a few hours. Some metals expand/constrict more than others...and these stems may not be the same metal as the bike frame. Theories about the unsinkable Titanic, and cold weather....hmm?
Web search it "remove seat stem from frame ". Many postings.
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