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@Daem
Have you any idea what the melting temp of the solder is?
I use a 'soft' and 'hard' silver solder at work but only joining silver, nickel silver, gold and occasionally platinum. Soft solder will melt to a lighter flame and the 'hard' solder needs a gas torch and quite alot of heat.
Regardless I don't think silver solder of whatever melting temp will form a decent enough bond with steel and I suspect you'd be better trying to go in a wielding/brazing type direction.
Or if it's decoration only, maybe that chemical steel repair stuff you can get?
http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_209003_langId_-1_categoryId_165691
Found this, might give you a bit more info. I know i's regarding stainless but I'd guess it'd be pretty similar
http://en.allexperts.com/q/Jewelry-Gems-Minerals-689/2008/8/Soldering-Stainless-Steel.htm