Stainless Steel 304 or 316?
I have a stainless steel class A chimney which is probably 304 stainless. Is it necessary to add a 316 liner if I occasionally burn anthracite coal less than ten times a year. Other times, I will burn wood. The stove will be a backup to our heat pump in winter.
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The wood burning should provide a protective coating to counter the coal deposits.
- coaledsweat
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So they say. My experience is once you start burning coal it falls right off though.
- franpipeman
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Don’t know if you can get 904 stainless steel over in the states , but in the Uk it’s classed as a grade 1 , which means it can be used for all types of solid fuel and is recommended if you have a multi fuel stove as it has a higher degree of resistance to corrosion From sulphur than 304/ 316 . Normally if it’s a chimney liner they give a 25 year warranty . Just a thought .
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Here you go
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This peaked my interest - I'm a newby with coal, but I work with stainless alloys all the time.Wal wrote: ↑Tue. Aug. 24, 2021 5:03 amDon’t know if you can get 904 stainless steel over in the states , but in the Uk it’s classed as a grade 1 , which means it can be used for all types of solid fuel and is recommended if you have a multi fuel stove as it has a higher degree of resistance to corrosion From sulphur than 304/ 316 . Normally if it’s a chimney liner they give a 25 year warranty . Just a thought .
The US, UK and Europe all have different steel identification systems, but in this case "904" is according to the US system. The full number is N08904 - that "N" prefix means its loaded with Nickel. It actually has so much alloy addition its less than 50% Iron.
In the specific application of a chimney for a coal fire, I can't say whether 316Ti or 904 would last longer, but I expect 904 to be substantially more expensive up front.
https://en.wikipedia.org/wiki/Steel_grades#Comparisons
https://en.wikipedia.org/wiki/SAE_904L_stainless_steel
Thanks for the tip, I might work with 904 in the future...
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From my previous post about stainless pipe (Duravent, which I believe is 430 stainless)
“I'm on my third year with Duravent, and I'm amazed at how quick it seems to be rusting. My cap and bottom-tee cap both rusted to failure the first season. Convinced the company to replace them under warranty, but they told me I must be burning "low quality coal" and that they wouldn't be replacing them again. I knew it wouldn't last forever, but wow! The straight sections and tee themselves seem to be holding up a little better, but are visibly rusting inside and out. At the end of each season I've disassembled them, brushed them out, and stored them in my garage, hoping to prolong the inevitable. My black iron pipe inside the boiler room has also rusted to failure more than once in the few years that I've been running my boiler. Looking back I guess I should have just built a masonry chimney.”
Recently switched to 316 Stainless pipe, which seems much heavier duty. Hoping for the best.
“I'm on my third year with Duravent, and I'm amazed at how quick it seems to be rusting. My cap and bottom-tee cap both rusted to failure the first season. Convinced the company to replace them under warranty, but they told me I must be burning "low quality coal" and that they wouldn't be replacing them again. I knew it wouldn't last forever, but wow! The straight sections and tee themselves seem to be holding up a little better, but are visibly rusting inside and out. At the end of each season I've disassembled them, brushed them out, and stored them in my garage, hoping to prolong the inevitable. My black iron pipe inside the boiler room has also rusted to failure more than once in the few years that I've been running my boiler. Looking back I guess I should have just built a masonry chimney.”
Recently switched to 316 Stainless pipe, which seems much heavier duty. Hoping for the best.
- ShawnLiNy
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What am I doing right or wrong ? I’ve Been using the all the same pipes since 2008 my single wall got some spots over the past summer so I brushed and painted ( will change them out after season is over) outside the class A is in great shape with the exception of some staining ( the inside is fully intact no rusting /rot . I burn coal 24-7 dec-March with wood /compressed wood during warm spells and the shoulder months
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Keep it dry in the off-season and you’ll last many years. Too many folks just say it won’t last. I have an insulated 306 liner where I had a Harman mark 3 for years. I’ve since sold the stove, and have a wood burner in it. Zero signs of rust or rot. That’s a good 14 or 15 years old now.