However the good thing is that if you go and purchase some stainless
tubing/pipe/flanges/valves/fittings/etc , there's a 99.5% chance you'll be
buying one of those 2 austenitic grades, nevertheless, a caution worth noting.
I was somewhat surprised to see duplex grades in the incompatible list.
Troy.
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On
Behalf Of Henry Vanderbilt
Sent: Friday, 4 November 2016 2:58 PM
To: arocket@xxxxxxxxxxxxx
Subject: {Spam?} [AR] Re: LOX Test Stand Integration
On 11/3/2016 6:56 PM, Ben Brockert wrote:
No, mild steel is not compatible with any cryogens. It becomes brittle
and could explode when pressurized or shatter when shocked. Stick with
aluminum, stainless steel, or brass. Robert's tanks are aluminum.
A major caution here - not all stainless steels are cryo compatible.
Some are no better than non-stainless steels, and will also get dangerously
brittle at low temps far short of LOX temps.
From http://www.bssa.org.uk/topics.php?article=41, "Selection of stainless
steels for cryogenic applications:
"The ferritic, martensitic and duplex stainless steels cannot be considered as
cryogenic steels. Their impact characteristics change at sub-zero
temperatures
in a similar way to low alloy steels."
and "The austenitics stainless steels such as 304 (1.4301) and 316
(1.4401) are however 'tough' at cryogenic temperatures and can be classed as
'cryogenic steels'."
Henry
