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Be careful if it's lead paint.
Also, having just stripped the paint off my stairs, I would highly recommend a Bahco 665 scraper:
https://www.buybrandtools.com/acatalog/bahco-665-heavy-duty-carbide-scraper.html
Or if you're in East London you can borrow mine.
tbc-
You're right to caution about the lead paint but infra red strippers (which the cobra is) don't heat the paint directly, they heat the wood underneath and the paint separates from the wood. Don't get me wrong, you can burn the paint and the smell of burning lead paint is unmistakeable.
Be very careful with the spoils, there are guides to handling them and make sure you keep the whole process clear of children and pregnant women.
The heavy duty carbide are great but staircases are very hard to do with one because you can't pull in the direction of the grain to scrape the surface. They work very well on door stiles, windows if they are out of the frames and window cills. If you are used to one and have some power in your arms they will strip all the paint off anything pretty fast.
The cobra really shines on mouldings.
Airhead
I've ordered a Speedheater Cobra to finish stripping the paint off my stairs. All this time at home needs to be used for something.