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Perlitic

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per·lite also pearl·ite  (pûrlt)
n.
A natural volcanic glass similar to obsidian but having distinctive concentric cracks and a relatively high water content. In a fluffy heat-expanded form perlite is used as a lightweight aggregate, in fire-resistant insulation, and in soil for potted plants.
[French (from perle, pearl, from Old French; see pearl1) or German Perlite (from Perle, pearl, ultimately from Vulgar Latin *pernula).]
per·litic (pr-ltk) adj.
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For example, after three years of operation of boilers TP-67 and TP-101, it is necessary to replace 1900-2700 sections of perlitic tubes (that makes 65-85 tons), and about 600 sections of austenitic tubes (3-5 tons or 30-50% of their total mass).
Assessment of remaining life of superheater austenitic steel tubes in ... by Klevtsov, I.; Tallermo, H.; Bojarinova, T.; Dedov, A. / Oil Shale
It is interesting to mention that relative acceleration of corrosion impact by oil shale ash on Cr-Ni austenitic alloy is more notable than on chromium perlitic steel, in spite of the fact that the absolute value of corrosion depth in the first case is lower.
Oil shale combustion technology by Ots, A. / Oil Shale
Corrosion resistance of protective coating with large Ni content, settled on perlitic steel tube specimen, was also tested in laboratory and in PF oil shale boilers.
High-temperature corrosion resistance of the austenitic steels in the ... by Klevtsov, I.; Tallermo, H.; Bojarinova, T.; Lausmaa, T. / Oil Shale
 
 
 
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