Hi Gary, I replied to this thread since it contains a lot of useful information about Chinese Fiber lasers and the settings in EZCad.

See the image attached to the original message to where "Q Pulse Width" setting is located.

The way I understand it, an annealing mark on steel can produce color marking. It's not an engraving or deep marking. There is a lot of youtube videos showing this effect on steel. Search "color fiber laser" to see an example.

Kenny