LsFarm wrote:Did you 'season' the grate before you built a full-heat fire on the grate?
It's generally a good idea to gently heat and cool cast iron parts a few times before putting them into full heat.
Cast iron has a lot of internal stresses, These stresses can cause warping if not gently relieved by the seasoning process.
And as mentioned above, make sure you don't let the ashes build up in the ash pan, blocking air to the underside of the
grate.. this insulates the grate from the cooling effects of the incoming air, and the grates overheat and warp.
I did not season the grate, first time I heard of this. Good info, thanks.
franco b wrote:Ash build up in the ash pan can overheat the grate.
As far as the ash goes, I've never had it high enough to affect the grate. If the ash got to that point then I emptied the ash pan after shaking down.
I'm hoping it was a fluke! I normally shake down and poke the coal bed from underneath until the bottom of the coal bed is completely glowing. I've been easing up on the shaking and poking hoping to leave a bit of ash on the grate to help insulate it from the coal bed. Trying everything I could think of, I don't want to warp another grate. Although the old grate is still usable!Thank you for your advice...much appreciated!