This is certainly NOT an area of expertise for me. However, I've done some WEB searching and have some tid-bits of info. It's not really organized in any special way so just treat it as 'info' to keep in mind.
Stripping lead-based paint -- most agree how NOT to do it, few agree how TO do it.
DEFINITELY DO NOT:
Burn off paint with a torch or high temperature heat gun; releases toxic fumes. Sand or dry scrape the paint; releases large amounts of dust. Chemically strip with methylene chloride; leaves a lead residue (and stripper is toxic). Grit blast; leaves a dust residue.
MAYBE: (depending on precautions and training of worker)
Heat gun to soften paint and minimize dust, then scrape . Chemical stripper to soften, then scrape.
Read this link - Stripping Lead Paint From Steel Structures - It talks about, as it says, in addition to what I'd interpret as 'general info' about strippers. It looks useful, and may help you in purchasing a chemical stripper.
And lastly, some more info ...
To strip paint, use a heat gun, a paint scraper, or a sanding block with course sandpaper (wear safety goggles and a mask). Note: Stripping lead-based paint is dangerous and should be done by a professional. Inhaling the dust or vapors can cause lead poisoning. Water-soluble paint strippers are available that contain less-hazardous ingredients.
Avoid strippers containing methylene chloride and trichloroethylene (TCE) (evidence that these cause cancer in laboratory animals); benzene (known to cause cancer in humans); 1, 1, 1-trichloroethane (TCA) (irritant to eyes and tissues), xylene (toxic by drinking or breathing); or toluene (known to cause birth defects).
Other ideas on getting info might be to visit you local Paint Retailer (found in the YELLOW PAGES under PAINT - RETAIL), like Sherwin-Williams. Also, check with a local Historical Society. And in closing, be sure you have a way to dispose of the stuff. You just can't throw it away. (It may end up in your drinking water ...)