To reduce the heat buildup you need to use the proper jigsaw blade with minimal pressure and set your jigsaw to a slow cutting speed.
Cutting stainless steel sheet with jigsaw.
Saw blades for cutting stainless steel.
Stainless steel is an attractive material for metal sculpture because of its superior corrosion resistance flexibility and strength.
Other than that stick with a tool that offers a circular blade.
You can create many interesting and durable works of art by cutting forms out of stainless steel sheet or plate but depending on the thickness of the material you are cutting and the complexity of the shape you may need to use some special tools and techniques.
The cut can produce enough heat to melt the teeth from the edge of a jigsaw blade.
Continue cutting along the cut line while applying cutting and tapping fluid until you have cut through the stainless steel sheet.
Attach the 60 grit flapper wheel to the 4 inch angle grinder.
When all the elements.
Put on your face shield.
Apply cutting and tapping fluid to the front edge of the jigsaw blade often to keep the jigsaw blade cool.