Why coal stoves have cast iron grates.

Why coal stoves have cast iron grates.

PostBy: Freddy On: Thu Nov 13, 2008 5:48 am

In an Axeman Anderson, coal feeds in the top, gets burned as it settles and the ashes are pushed out from the bottom. I wanted to see how long it took to go through one stove full of coal. I took a cube block of steel, 1" by 1" by 3/4" and set it on the very top of the pile of fuel. I kept checking the ashes with a magnet. 40 hours later it completed it's trip and here's a picture of it. It still weighs about the same!
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Freddy
 
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined

Re: Why coal stoves have cast iron grates.

PostBy: lincolnmania On: Thu Nov 13, 2008 6:07 am

you werent worried about it jamming things up?
i put a rather large insulated piece of copper in the hand fed stove once and forgot about it.....found copper nuggets in my ash :D
lincolnmania
 
Hot Air Coal Stoker Furnace: efm af-150 1982
Hot Air Coal Stoker Stove: alaska kodiak stoker 1986
Hand Fed Coal Stove: warm morning 1980 kenmore

Re: Why coal stoves have cast iron grates.

PostBy: BIG BEAM On: Thu Nov 13, 2008 1:13 pm

I've used my hotblast furnace to heat up some 3/8" steel rod when I made some tools for poking the fire and getting clinkers out of the grates.I bent a 45* angle on one end and a handle on the other end.It only took 1 or 2 minutes to get it really red.Bent like butta.
DON
BIG BEAM
 
Stove/Furnace Make: USS Hot blast
Stove/Furnace Model: 1557M


Re: Why coal stoves have cast iron grates.

PostBy: MrMikie On: Thu Nov 13, 2008 1:19 pm

Looks like it distorted a bit.

Was it a leaded alloy?
MrMikie
 
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Pioneer LE

Re: Why coal stoves have cast iron grates.

PostBy: Freddy On: Thu Nov 13, 2008 1:27 pm

I knew it would go through without jambing. Plenty of room. No lead! This was a piece of steel bar that I had kicking around. 100% cold rolled steel. I poked into the fire once with a copper tube... the end melted. I didn't expect the steel to melt like that though, I figured it would just turn red, then come out in the same shape as when it went in. It sure does get hot in there!
Freddy
 
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined

Re: Why coal stoves have cast iron grates.

PostBy: MrMikie On: Thu Nov 13, 2008 1:33 pm

I own a machine shop and at times use leaded alloys like 12L14. Its a free machining grade, but does not fair well if welded.

If I put a block in my stoker it might take 5-6 days before I found it again. :D
MrMikie
 
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Pioneer LE

Re: Why coal stoves have cast iron grates.

PostBy: BIG BEAM On: Thu Nov 13, 2008 8:59 pm

What about cast steel or is the melting temp lower than cast iron ?
DON
BIG BEAM
 
Stove/Furnace Make: USS Hot blast
Stove/Furnace Model: 1557M

Re: Why coal stoves have cast iron grates.

PostBy: coaledsweat On: Fri Nov 14, 2008 9:45 am

Cast iron has a melting point about 4-600* higher than steels depending on the grades. It will also hold it's shape better as it approaches it's melting point. As a material for shaker grates, it has about a 600* advantage over steel IIRC.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea