Are you guys burning in regular 316ss or 316ti ss? Reading more on 316ti, the titanium atoms stabilize the ss at high temperatures and will not allow the 316ss to precipitate chromium carbide , giving it much better corrosive resistance. Also reading more, if you are burning only anthracite and not a lower grade bituminous, then the sulfuric acid will be very low compared. I have been talking to some coal experts at the power plant in the past day or so. I'm not saying this 316ti won't fail on me sometime but I guess since I have a contract for a "lifetime" from the chimney installers to replace it at their cost, I feel ok about trying it out. A company offering that sort of contract, that has been in business many years, wouldn't just throw any old crap in the chimney if they knew they would have to eat 2600$ in a few years. At least that's how I look at it now. But I guess I will see first hand. I also am interested in getting a hold of some pieces of 316ti pipe and hearing it to 800 degrees and then smearing sulphuric acid on it as it cools, see the results. I was a metals technology guy in the Airforce for 6 years.
Some more interesting info on 316Ti
What is grade 316Ti (1.4571)?
Grade 316Ti stainless steel has been traditionally specified by German engineers and users with the Werkstoff number 1.4571.The former steel grade in the UK was 320S31.
This grade is essentially a standard carbon 316 type with titanium stabilisation and is similar in principle to the titanium stabilisation of the 304 (1.4301) type to produce 321 (1.4541). The addition of titanium is made to reduce the risk of intergranular corrosion (IC) following heating in the temperature range 425-815C.
When austenitic stainless steels are subject to prolonged heating in the temperature range 425-815C, the carbon in the steel diffuses to the grain boundaries and precipitates chromium carbide. This removes chromium from the solid solution and leaves a lower chromium content adjacent to the grain boundaries. Steels in this condition are termed 'sensitised'. The grain boundaries become prone to preferential atack on subsequent exposure to a corrosive environment. This type of corrosion is known as intergranular corrosion (IC), also known in the past as 'weld decay'.
The addition of titanium reduces the risk of IC since titanium carbo-nitrides are formed in preference to chromium carbides which has the effect of maintaining the correct distribution of chromium throughout the structure of the steel.
The result is that areas adjacent to grain boundaries, where the carbo-nitrides form, is not depleted of chromium to a level at which localised corrosion can occur in the grain boundary area.http://www.bssa.org.uk/topics.php?article=71http://enshop.ebdoor.com/Shops/516030/P ... /9510.aspx
Read the product uses of thes 316ti boiler tubes.
I am really interested in the science behind all this now. So I am going to read even more about this.