the web being what it is: not suggested
NOT safe as stainless steel- metal with chromium oxide layer especially irregularly shaped as the pan might very well cause microwave irregular reflective bouncing and amplification -burn/pop/crackle
"Should You Do It?
If you're unsure about putting a stainless steel item in the microwave, the best advice is: Don't. If it isn't lying on the bottom of the oven, there's always the possibility that it could be too close to one of the walls and could amplify the radiation. This can happen with stainless steel pots and containers. Utensils other than forks are usually safe, but it's always best to err on the side of safety. You don't want to find out the hard way that the spoon you thought was safe can start a fire if part of it is sticking up."