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Posted by David Billington on March 26, 2006, 4:27 pm
Please log in for more thread options Interesting your comment on 316, my blowing irons have a 310 head at the
hot end for the first 6" then 316 tube for the rest of the iron. I have
spoken to some blowers that have trouble with scaling, not from the head
but from the tube after it which is 304 IIRC in most cases. Some
reheating can get that area fairly hot and leads to scaling inside the
tube, no fun if you are a glassblower and scale falls into your piece
from the iron. Pre blow tapping of the iron to remove it helps alleviate
the problem. Hopefully my use of 316 may also reduce it to some extent.
Also agreed that getting some samples and testing in the situation there
are to be used in will be the best way to determine suitability.
Ned Simmons wrote:
>djb@djbillington.freeserve.co.uk says...
>
>>I have made some glass blowing irons which are used for gathering glass
>>at around 1100C (2012F) and I used 310 for that and it currently shows
>>discolouration but no scaling. They haven't been used a great deal
>>though yet. 310 was recommended as suitable for use in high temp
>>furnaces and was available in the UK. A number of blowing iron makers in
>>the US use 309 but its not commonly available in the UK. IIRC the 310
>>has higher Cr and Ni than 309 so may have more resistance at high temp.
>>
>
>I'll agree on the 310 - it's commonly used for furnace muffles up to
>around 1800F. Much hotter, and you're into Inconel (Inconel 600?)
>territory. Atmosphere will also make a big difference in scaling. Keep
>in mind that at 1800F even 310 will have lost a lot of strength.
>
>You might get away with 316L, which is easily available, at 1500F. I'd
>do some testing before committing a lot of time or money.
>
>Ned Simmons
>
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>
> What type of SS would best withstand temps of 1500F and occasionally
> as high as 1800F?
>
> My greatest concern is flaking and contaminating the glass.
>
> Thank you.