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Just FYI, the general suggested temperature for 60/40 is 375C. So 400 is not too far off.

Do you mean 375 F? 60/40 is liquid at that temp (374 F). 375 C is way overkill for lead unless your iron is terrible.

Nope 350-375C. You want to have higher temperature on the tip to be able to melt it reliably.

Look it up, also I discovered that 350C is not double as hot as 175C, actually just 25% more.