Rikki-Tikki (asker) Jan 17, 2016:

Дополнительный контекст:

In the 1960’s, the heat resistant (H) series of austenitic alloys were developed for
use in reforming furnaces. The larger amount of chromium and nickel that these alloys
contain increases the high temperature strength, ductility, and corrosion resistance during
service [1]
. The initial alloy used was the HK-40 alloy, which was improved with the
addition of silicon and niobium in the early 1970’s and finally replaced with the higher
creep strength and oxidation resistance of the HP-mod alloy in the mid 1970’s [3]
.
3
Eventually, this pursuit of increased creep strength and decreased weight has led to the
industry acceptance of HP-micro, which contains additional elements in addition to the
ones added to the HP-mod alloy.

http://trace.tennessee.edu/cgi/viewcontent.cgi?article=4075&...