Well, my new tojiro chef knife was left on an on burner for about five minutes. Luckily it wasnt damaged.
I would have thought that the plastic/resin whatever handle would have melted, but it didnt.
it was just the end of the handle that was over the burner. About 3 centimeters worth or so. It was between 2 and 3 on the heat level. The metal, from what I can see, doesnt appear to of changed color. The but was to hot to hold. I ran it under running water to cool it off.
The only part of the steel that I can see is the edge that shows on the sides of the handle so ..
I'm no knife expert like some on here but after thirty years of using/abusing equipment, I'll say that your knife is fine. It was just the handle and that didn't melt. You are a bit over concerned because it's a nice new knife but after this you will be over cautious. So lesson learned with no damage. You dodged the bullet this time.