1- Swords are made of steel, not iron
2- There are steel swords more durable than others, hence why there are 5categories of swords in the one piece world with the Shusui for example having heavy durability hype
Show me where Sanji's diable jambe has been described to be white flames. Show me where Sanji's diable jambe has been described to surpass 500 degrees C. Show me the manga panel where you've seen diable jambe melting regular steel swords. Show me where it has been described to be able to melt higher quality steel swords
Until you can show me all this, all what you say is wrong
Even so: White flames: Between 4986 degrees and 9008 degrees
Steel melting point is lower than Irons melting point... 1370 degrees
You would've been better off not pointing out the technicalities.
Are you blind? It's been SHOWN to be white. MANY times. WOW. I don't need to show you him melting stuff, it's simple logic. Something your feeble mind doesn't seem capable of comprehending. Fact is fact, and you can't deny how hot white flames are.
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Now f*ck off. How is that not white?