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PhilDAS-
amirite?
Yes, you can make a thing stronger by using more of the same material in the right place. A custom frame could be built in arbitrarily heavy gauge 4130 to take almost any load. There are some custom shops who have experience of building for riders well north of 200kg; for obvious reasons, these tend to be in the USA.
gbj_tester
Not angry, but they will want to add a caveat. There's more to strength than just how much metal you use. Taking just the typical steels used for seat tubes, a BSO made from mild steel will need to be more twice the weight of a good 4130 frame just to have the same strength.