The following are ratios of tin to lead and their respective melting points:
* 63/37: melts between 180-185°C
* 60/40: melts between 183–190°C
* 50/50: melts between 185–215°C
* lead-free solder: melts around 250°C
I believe what you have is considered "lead free". It should work fine. Of course you can always use silver solder available at plumbing or welding supply stores melts at around 616* C depending on alloy. You will kinda need a torch better than your hand held propane to do it effectively.