How to find plasteel/improve chances of getting it?

[NemesisN]

It has, what, about 10 hitpoints over Granite? In the time it will take for the fighting to end, a colonist to get there, and put out the fire, the wall will have lost more than 10 HP due to the fire. If Uranium has an edge over Granite, it will be an even narrower margin. And if they ever fix uranium, you'll be lucky if you can keep a wall like that from burning to the ground, real uranium is quite flammable!

Granite wall - 595 Hitpoints 0% flammability
Uranium wall - 875 Hitpoints 0% flammability
Plasteel wall - 980 Hitpoints 10% flammability

Difference between Plasteel and Granite hitpoints are 385 (large difference).....so what 10 hitpoints are you talking about ?? Plasteel is the strongest by far from Granite and 100 hitpoints from Uranium the second strongest

10% flammability is very little and for 980 hitpoints to burn down it takes huge amount of time because it burns very very slowly....My plasteel never ever burned down even when I left it to burn during the entire RimWorld day during the raid....you have plenty of time to put the fire down or wait for the rain or winter